/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hdfs.server.blockmanagement;
import static org.apache.hadoop.util.ExitUtil.terminate;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Queue;
import java.util.Set;
import java.util.TreeMap;
import java.util.concurrent.atomic.AtomicLong;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.HadoopIllegalArgumentException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DFSUtil;
import org.apache.hadoop.hdfs.HAUtil;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.BlockListAsLongs;
import org.apache.hadoop.hdfs.protocol.BlockListAsLongs.BlockReportIterator;
import org.apache.hadoop.hdfs.protocol.DatanodeID;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
import org.apache.hadoop.hdfs.protocol.UnregisteredNodeException;
import org.apache.hadoop.hdfs.security.token.block.BlockTokenSecretManager;
import org.apache.hadoop.hdfs.security.token.block.BlockTokenSecretManager.AccessMode;
import org.apache.hadoop.hdfs.security.token.block.DataEncryptionKey;
import org.apache.hadoop.hdfs.security.token.block.ExportedBlockKeys;
import org.apache.hadoop.hdfs.server.blockmanagement.PendingDataNodeMessages.ReportedBlockInfo;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.BlockUCState;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.ReplicaState;
import org.apache.hadoop.hdfs.server.namenode.FSClusterStats;
import org.apache.hadoop.hdfs.server.namenode.NameNode;
import org.apache.hadoop.hdfs.server.namenode.NameNode.OperationCategory;
import org.apache.hadoop.hdfs.server.namenode.Namesystem;
import org.apache.hadoop.hdfs.server.namenode.metrics.NameNodeMetrics;
import org.apache.hadoop.hdfs.server.protocol.BlockCommand;
import org.apache.hadoop.hdfs.server.protocol.BlocksWithLocations;
import org.apache.hadoop.hdfs.server.protocol.BlocksWithLocations.BlockWithLocations;
import org.apache.hadoop.hdfs.server.protocol.DatanodeCommand;
import org.apache.hadoop.hdfs.server.protocol.KeyUpdateCommand;
import org.apache.hadoop.hdfs.server.protocol.ReceivedDeletedBlockInfo;
import org.apache.hadoop.hdfs.util.LightWeightLinkedSet;
import org.apache.hadoop.net.Node;
import org.apache.hadoop.util.Daemon;
import org.apache.hadoop.util.Time;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.collect.Sets;
/**
* Keeps information related to the blocks stored in the Hadoop cluster.
*/
@InterfaceAudience.Private
public class BlockManager {
static final Log LOG = LogFactory.getLog(BlockManager.class);
public static final Log blockLog = NameNode.blockStateChangeLog;
/** Default load factor of map */
public static final float DEFAULT_MAP_LOAD_FACTOR = 0.75f;
private static final String QUEUE_REASON_CORRUPT_STATE =
"it has the wrong state or generation stamp";
private static final String QUEUE_REASON_FUTURE_GENSTAMP =
"generation stamp is in the future";
private final Namesystem namesystem;
private final DatanodeManager datanodeManager;
private final HeartbeatManager heartbeatManager;
private final BlockTokenSecretManager blockTokenSecretManager;
private final PendingDataNodeMessages pendingDNMessages =
new PendingDataNodeMessages();
private volatile long pendingReplicationBlocksCount = 0L;
private volatile long corruptReplicaBlocksCount = 0L;
private volatile long underReplicatedBlocksCount = 0L;
private volatile long scheduledReplicationBlocksCount = 0L;
private AtomicLong excessBlocksCount = new AtomicLong(0L);
private AtomicLong postponedMisreplicatedBlocksCount = new AtomicLong(0L);
/** Used by metrics */
public long getPendingReplicationBlocksCount() {
return pendingReplicationBlocksCount;
}
/** Used by metrics */
public long getUnderReplicatedBlocksCount() {
return underReplicatedBlocksCount;
}
/** Used by metrics */
public long getCorruptReplicaBlocksCount() {
return corruptReplicaBlocksCount;
}
/** Used by metrics */
public long getScheduledReplicationBlocksCount() {
return scheduledReplicationBlocksCount;
}
/** Used by metrics */
public long getPendingDeletionBlocksCount() {
return invalidateBlocks.numBlocks();
}
/** Used by metrics */
public long getExcessBlocksCount() {
return excessBlocksCount.get();
}
/** Used by metrics */
public long getPostponedMisreplicatedBlocksCount() {
return postponedMisreplicatedBlocksCount.get();
}
/** Used by metrics */
public int getPendingDataNodeMessageCount() {
return pendingDNMessages.count();
}
/**replicationRecheckInterval is how often namenode checks for new replication work*/
private final long replicationRecheckInterval;
/**
* Mapping: Block -> { BlockCollection, datanodes, self ref }
* Updated only in response to client-sent information.
*/
final BlocksMap blocksMap;
/** Replication thread. */
final Daemon replicationThread = new Daemon(new ReplicationMonitor());
/** Store blocks -> datanodedescriptor(s) map of corrupt replicas */
final CorruptReplicasMap corruptReplicas = new CorruptReplicasMap();
/** Blocks to be invalidated. */
private final InvalidateBlocks invalidateBlocks;
/**
* After a failover, over-replicated blocks may not be handled
* until all of the replicas have done a block report to the
* new active. This is to make sure that this NameNode has been
* notified of all block deletions that might have been pending
* when the failover happened.
*/
private final Set<Block> postponedMisreplicatedBlocks = Sets.newHashSet();
/**
* Maps a StorageID to the set of blocks that are "extra" for this
* DataNode. We'll eventually remove these extras.
*/
public final Map<String, LightWeightLinkedSet<Block>> excessReplicateMap =
new TreeMap<String, LightWeightLinkedSet<Block>>();
/**
* Store set of Blocks that need to be replicated 1 or more times.
* We also store pending replication-orders.
*/
public final UnderReplicatedBlocks neededReplications = new UnderReplicatedBlocks();
@VisibleForTesting
final PendingReplicationBlocks pendingReplications;
/** The maximum number of replicas allowed for a block */
public final short maxReplication;
/**
* The maximum number of outgoing replication streams a given node should have
* at one time considering all but the highest priority replications needed.
*/
int maxReplicationStreams;
/**
* The maximum number of outgoing replication streams a given node should have
* at one time.
*/
int replicationStreamsHardLimit;
/** Minimum copies needed or else write is disallowed */
public final short minReplication;
/** Default number of replicas */
public final int defaultReplication;
/** value returned by MAX_CORRUPT_FILES_RETURNED */
final int maxCorruptFilesReturned;
final float blocksInvalidateWorkPct;
final int blocksReplWorkMultiplier;
/** variable to enable check for enough racks */
final boolean shouldCheckForEnoughRacks;
// whether or not to issue block encryption keys.
final boolean encryptDataTransfer;
/**
* When running inside a Standby node, the node may receive block reports
* from datanodes before receiving the corresponding namespace edits from
* the active NameNode. Thus, it will postpone them for later processing,
* instead of marking the blocks as corrupt.
*/
private boolean shouldPostponeBlocksFromFuture = false;
/** for block replicas placement */
private BlockPlacementPolicy blockplacement;
/** Check whether name system is running before terminating */
private boolean checkNSRunning = true;
public BlockManager(final Namesystem namesystem, final FSClusterStats stats,
final Configuration conf) throws IOException {
this.namesystem = namesystem;
datanodeManager = new DatanodeManager(this, namesystem, conf);
heartbeatManager = datanodeManager.getHeartbeatManager();
invalidateBlocks = new InvalidateBlocks(datanodeManager);
// Compute the map capacity by allocating 2% of total memory
blocksMap = new BlocksMap(DEFAULT_MAP_LOAD_FACTOR);
blockplacement = BlockPlacementPolicy.getInstance(
conf, stats, datanodeManager.getNetworkTopology());
pendingReplications = new PendingReplicationBlocks(conf.getInt(
DFSConfigKeys.DFS_NAMENODE_REPLICATION_PENDING_TIMEOUT_SEC_KEY,
DFSConfigKeys.DFS_NAMENODE_REPLICATION_PENDING_TIMEOUT_SEC_DEFAULT) * 1000L);
blockTokenSecretManager = createBlockTokenSecretManager(conf);
this.maxCorruptFilesReturned = conf.getInt(
DFSConfigKeys.DFS_DEFAULT_MAX_CORRUPT_FILES_RETURNED_KEY,
DFSConfigKeys.DFS_DEFAULT_MAX_CORRUPT_FILES_RETURNED);
this.defaultReplication = conf.getInt(DFSConfigKeys.DFS_REPLICATION_KEY,
DFSConfigKeys.DFS_REPLICATION_DEFAULT);
final int maxR = conf.getInt(DFSConfigKeys.DFS_REPLICATION_MAX_KEY,
DFSConfigKeys.DFS_REPLICATION_MAX_DEFAULT);
final int minR = conf.getInt(DFSConfigKeys.DFS_NAMENODE_REPLICATION_MIN_KEY,
DFSConfigKeys.DFS_NAMENODE_REPLICATION_MIN_DEFAULT);
if (minR <= 0)
throw new IOException("Unexpected configuration parameters: "
+ DFSConfigKeys.DFS_NAMENODE_REPLICATION_MIN_KEY
+ " = " + minR + " <= 0");
if (maxR > Short.MAX_VALUE)
throw new IOException("Unexpected configuration parameters: "
+ DFSConfigKeys.DFS_REPLICATION_MAX_KEY
+ " = " + maxR + " > " + Short.MAX_VALUE);
if (minR > maxR)
throw new IOException("Unexpected configuration parameters: "
+ DFSConfigKeys.DFS_NAMENODE_REPLICATION_MIN_KEY
+ " = " + minR + " > "
+ DFSConfigKeys.DFS_REPLICATION_MAX_KEY
+ " = " + maxR);
this.minReplication = (short)minR;
this.maxReplication = (short)maxR;
this.maxReplicationStreams =
conf.getInt(DFSConfigKeys.DFS_NAMENODE_REPLICATION_MAX_STREAMS_KEY,
DFSConfigKeys.DFS_NAMENODE_REPLICATION_MAX_STREAMS_DEFAULT);
this.replicationStreamsHardLimit =
conf.getInt(
DFSConfigKeys.DFS_NAMENODE_REPLICATION_STREAMS_HARD_LIMIT_KEY,
DFSConfigKeys.DFS_NAMENODE_REPLICATION_STREAMS_HARD_LIMIT_DEFAULT);
this.shouldCheckForEnoughRacks =
conf.get(DFSConfigKeys.NET_TOPOLOGY_SCRIPT_FILE_NAME_KEY) == null
? false : true;
this.blocksInvalidateWorkPct = DFSUtil.getInvalidateWorkPctPerIteration(conf);
this.blocksReplWorkMultiplier = DFSUtil.getReplWorkMultiplier(conf);
this.replicationRecheckInterval =
conf.getInt(DFSConfigKeys.DFS_NAMENODE_REPLICATION_INTERVAL_KEY,
DFSConfigKeys.DFS_NAMENODE_REPLICATION_INTERVAL_DEFAULT) * 1000L;
this.encryptDataTransfer =
conf.getBoolean(DFSConfigKeys.DFS_ENCRYPT_DATA_TRANSFER_KEY,
DFSConfigKeys.DFS_ENCRYPT_DATA_TRANSFER_DEFAULT);
LOG.info("defaultReplication = " + defaultReplication);
LOG.info("maxReplication = " + maxReplication);
LOG.info("minReplication = " + minReplication);
LOG.info("maxReplicationStreams = " + maxReplicationStreams);
LOG.info("shouldCheckForEnoughRacks = " + shouldCheckForEnoughRacks);
LOG.info("replicationRecheckInterval = " + replicationRecheckInterval);
LOG.info("encryptDataTransfer = " + encryptDataTransfer);
}
private static BlockTokenSecretManager createBlockTokenSecretManager(
final Configuration conf) {
final boolean isEnabled = conf.getBoolean(
DFSConfigKeys.DFS_BLOCK_ACCESS_TOKEN_ENABLE_KEY,
DFSConfigKeys.DFS_BLOCK_ACCESS_TOKEN_ENABLE_DEFAULT);
LOG.info(DFSConfigKeys.DFS_BLOCK_ACCESS_TOKEN_ENABLE_KEY + "=" + isEnabled);
if (!isEnabled) {
return null;
}
final long updateMin = conf.getLong(
DFSConfigKeys.DFS_BLOCK_ACCESS_KEY_UPDATE_INTERVAL_KEY,
DFSConfigKeys.DFS_BLOCK_ACCESS_KEY_UPDATE_INTERVAL_DEFAULT);
final long lifetimeMin = conf.getLong(
DFSConfigKeys.DFS_BLOCK_ACCESS_TOKEN_LIFETIME_KEY,
DFSConfigKeys.DFS_BLOCK_ACCESS_TOKEN_LIFETIME_DEFAULT);
final String encryptionAlgorithm = conf.get(
DFSConfigKeys.DFS_DATA_ENCRYPTION_ALGORITHM_KEY);
LOG.info(DFSConfigKeys.DFS_BLOCK_ACCESS_KEY_UPDATE_INTERVAL_KEY
+ "=" + updateMin + " min(s), "
+ DFSConfigKeys.DFS_BLOCK_ACCESS_TOKEN_LIFETIME_KEY
+ "=" + lifetimeMin + " min(s), "
+ DFSConfigKeys.DFS_DATA_ENCRYPTION_ALGORITHM_KEY
+ "=" + encryptionAlgorithm);
String nsId = DFSUtil.getNamenodeNameServiceId(conf);
boolean isHaEnabled = HAUtil.isHAEnabled(conf, nsId);
if (isHaEnabled) {
String thisNnId = HAUtil.getNameNodeId(conf, nsId);
String otherNnId = HAUtil.getNameNodeIdOfOtherNode(conf, nsId);
return new BlockTokenSecretManager(updateMin*60*1000L,
lifetimeMin*60*1000L, thisNnId.compareTo(otherNnId) < 0 ? 0 : 1, null,
encryptionAlgorithm);
} else {
return new BlockTokenSecretManager(updateMin*60*1000L,
lifetimeMin*60*1000L, 0, null, encryptionAlgorithm);
}
}
public void setBlockPoolId(String blockPoolId) {
if (isBlockTokenEnabled()) {
blockTokenSecretManager.setBlockPoolId(blockPoolId);
}
}
/** get the BlockTokenSecretManager */
@VisibleForTesting
public BlockTokenSecretManager getBlockTokenSecretManager() {
return blockTokenSecretManager;
}
/** Allow silent termination of replication monitor for testing */
@VisibleForTesting
void enableRMTerminationForTesting() {
checkNSRunning = false;
}
private boolean isBlockTokenEnabled() {
return blockTokenSecretManager != null;
}
/** Should the access keys be updated? */
boolean shouldUpdateBlockKey(final long updateTime) throws IOException {
return isBlockTokenEnabled()? blockTokenSecretManager.updateKeys(updateTime)
: false;
}
public void activate(Configuration conf) {
pendingReplications.start();
datanodeManager.activate(conf);
this.replicationThread.start();
}
public void close() {
try {
if (replicationThread != null) {
replicationThread.interrupt();
replicationThread.join(3000);
}
} catch (InterruptedException ie) {
}
datanodeManager.close();
pendingReplications.stop();
blocksMap.close();
}
/** @return the datanodeManager */
public DatanodeManager getDatanodeManager() {
return datanodeManager;
}
/** @return the BlockPlacementPolicy */
public BlockPlacementPolicy getBlockPlacementPolicy() {
return blockplacement;
}
/** Set BlockPlacementPolicy */
public void setBlockPlacementPolicy(BlockPlacementPolicy newpolicy) {
if (newpolicy == null) {
throw new HadoopIllegalArgumentException("newpolicy == null");
}
this.blockplacement = newpolicy;
}
/** Dump meta data to out. */
public void metaSave(PrintWriter out) {
assert namesystem.hasWriteLock();
final List<DatanodeDescriptor> live = new ArrayList<DatanodeDescriptor>();
final List<DatanodeDescriptor> dead = new ArrayList<DatanodeDescriptor>();
datanodeManager.fetchDatanodes(live, dead, false);
out.println("Live Datanodes: " + live.size());
out.println("Dead Datanodes: " + dead.size());
//
// Dump contents of neededReplication
//
synchronized (neededReplications) {
out.println("Metasave: Blocks waiting for replication: " +
neededReplications.size());
for (Block block : neededReplications) {
dumpBlockMeta(block, out);
}
}
// Dump any postponed over-replicated blocks
out.println("Mis-replicated blocks that have been postponed:");
for (Block block : postponedMisreplicatedBlocks) {
dumpBlockMeta(block, out);
}
// Dump blocks from pendingReplication
pendingReplications.metaSave(out);
// Dump blocks that are waiting to be deleted
invalidateBlocks.dump(out);
// Dump all datanodes
getDatanodeManager().datanodeDump(out);
}
/**
* Dump the metadata for the given block in a human-readable
* form.
*/
private void dumpBlockMeta(Block block, PrintWriter out) {
List<DatanodeDescriptor> containingNodes =
new ArrayList<DatanodeDescriptor>();
List<DatanodeDescriptor> containingLiveReplicasNodes =
new ArrayList<DatanodeDescriptor>();
NumberReplicas numReplicas = new NumberReplicas();
// source node returned is not used
chooseSourceDatanode(block, containingNodes,
containingLiveReplicasNodes, numReplicas,
UnderReplicatedBlocks.LEVEL);
assert containingLiveReplicasNodes.size() == numReplicas.liveReplicas();
int usableReplicas = numReplicas.liveReplicas() +
numReplicas.decommissionedReplicas();
if (block instanceof BlockInfo) {
BlockCollection bc = ((BlockInfo) block).getBlockCollection();
String fileName = (bc == null) ? "[orphaned]" : bc.getName();
out.print(fileName + ": ");
}
// l: == live:, d: == decommissioned c: == corrupt e: == excess
out.print(block + ((usableReplicas > 0)? "" : " MISSING") +
" (replicas:" +
" l: " + numReplicas.liveReplicas() +
" d: " + numReplicas.decommissionedReplicas() +
" c: " + numReplicas.corruptReplicas() +
" e: " + numReplicas.excessReplicas() + ") ");
Collection<DatanodeDescriptor> corruptNodes =
corruptReplicas.getNodes(block);
for (Iterator<DatanodeDescriptor> jt = blocksMap.nodeIterator(block);
jt.hasNext();) {
DatanodeDescriptor node = jt.next();
String state = "";
if (corruptNodes != null && corruptNodes.contains(node)) {
state = "(corrupt)";
} else if (node.isDecommissioned() ||
node.isDecommissionInProgress()) {
state = "(decommissioned)";
}
if (node.areBlockContentsStale()) {
state += " (block deletions maybe out of date)";
}
out.print(" " + node + state + " : ");
}
out.println("");
}
/** @return maxReplicationStreams */
public int getMaxReplicationStreams() {
return maxReplicationStreams;
}
/**
* @param block
* @return true if the block has minimum replicas
*/
public boolean checkMinReplication(Block block) {
return (countNodes(block).liveReplicas() >= minReplication);
}
/**
* Commit a block of a file
*
* @param block block to be committed
* @param commitBlock - contains client reported block length and generation
* @return true if the block is changed to committed state.
* @throws IOException if the block does not have at least a minimal number
* of replicas reported from data-nodes.
*/
private static boolean commitBlock(final BlockInfoUnderConstruction block,
final Block commitBlock) throws IOException {
if (block.getBlockUCState() == BlockUCState.COMMITTED)
return false;
assert block.getNumBytes() <= commitBlock.getNumBytes() :
"commitBlock length is less than the stored one "
+ commitBlock.getNumBytes() + " vs. " + block.getNumBytes();
block.commitBlock(commitBlock);
return true;
}
/**
* Commit the last block of the file and mark it as complete if it has
* meets the minimum replication requirement
*
* @param bc block collection
* @param commitBlock - contains client reported block length and generation
* @return true if the last block is changed to committed state.
* @throws IOException if the block does not have at least a minimal number
* of replicas reported from data-nodes.
*/
public boolean commitOrCompleteLastBlock(MutableBlockCollection bc,
Block commitBlock) throws IOException {
if(commitBlock == null)
return false; // not committing, this is a block allocation retry
BlockInfo lastBlock = bc.getLastBlock();
if(lastBlock == null)
return false; // no blocks in file yet
if(lastBlock.isComplete())
return false; // already completed (e.g. by syncBlock)
final boolean b = commitBlock((BlockInfoUnderConstruction)lastBlock, commitBlock);
if(countNodes(lastBlock).liveReplicas() >= minReplication)
completeBlock(bc, bc.numBlocks()-1, false);
return b;
}
/**
* Convert a specified block of the file to a complete block.
* @param bc file
* @param blkIndex block index in the file
* @throws IOException if the block does not have at least a minimal number
* of replicas reported from data-nodes.
*/
private BlockInfo completeBlock(final MutableBlockCollection bc,
final int blkIndex, boolean force) throws IOException {
if(blkIndex < 0)
return null;
BlockInfo curBlock = bc.getBlocks()[blkIndex];
if(curBlock.isComplete())
return curBlock;
BlockInfoUnderConstruction ucBlock = (BlockInfoUnderConstruction)curBlock;
int numNodes = ucBlock.numNodes();
if (!force && numNodes < minReplication)
throw new IOException("Cannot complete block: " +
"block does not satisfy minimal replication requirement.");
if(!force && ucBlock.getBlockUCState() != BlockUCState.COMMITTED)
throw new IOException(
"Cannot complete block: block has not been COMMITTED by the client");
BlockInfo completeBlock = ucBlock.convertToCompleteBlock();
// replace penultimate block in file
bc.setBlock(blkIndex, completeBlock);
// Since safe-mode only counts complete blocks, and we now have
// one more complete block, we need to adjust the total up, and
// also count it as safe, if we have at least the minimum replica
// count. (We may not have the minimum replica count yet if this is
// a "forced" completion when a file is getting closed by an
// OP_CLOSE edit on the standby).
namesystem.adjustSafeModeBlockTotals(0, 1);
namesystem.incrementSafeBlockCount(
Math.min(numNodes, minReplication));
// replace block in the blocksMap
return blocksMap.replaceBlock(completeBlock);
}
private BlockInfo completeBlock(final MutableBlockCollection bc,
final BlockInfo block, boolean force) throws IOException {
BlockInfo[] fileBlocks = bc.getBlocks();
for(int idx = 0; idx < fileBlocks.length; idx++)
if(fileBlocks[idx] == block) {
return completeBlock(bc, idx, force);
}
return block;
}
/**
* Force the given block in the given file to be marked as complete,
* regardless of whether enough replicas are present. This is necessary
* when tailing edit logs as a Standby.
*/
public BlockInfo forceCompleteBlock(final MutableBlockCollection bc,
final BlockInfoUnderConstruction block) throws IOException {
block.commitBlock(block);
return completeBlock(bc, block, true);
}
/**
* Convert the last block of the file to an under construction block.<p>
* The block is converted only if the file has blocks and the last one
* is a partial block (its size is less than the preferred block size).
* The converted block is returned to the client.
* The client uses the returned block locations to form the data pipeline
* for this block.<br>
* The methods returns null if there is no partial block at the end.
* The client is supposed to allocate a new block with the next call.
*
* @param bc file
* @return the last block locations if the block is partial or null otherwise
*/
public LocatedBlock convertLastBlockToUnderConstruction(
MutableBlockCollection bc) throws IOException {
BlockInfo oldBlock = bc.getLastBlock();
if(oldBlock == null ||
bc.getPreferredBlockSize() == oldBlock.getNumBytes())
return null;
assert oldBlock == getStoredBlock(oldBlock) :
"last block of the file is not in blocksMap";
DatanodeDescriptor[] targets = getNodes(oldBlock);
BlockInfoUnderConstruction ucBlock =
bc.setLastBlock(oldBlock, targets);
blocksMap.replaceBlock(ucBlock);
// Remove block from replication queue.
NumberReplicas replicas = countNodes(ucBlock);
neededReplications.remove(ucBlock, replicas.liveReplicas(),
replicas.decommissionedReplicas(), getReplication(ucBlock));
pendingReplications.remove(ucBlock);
// remove this block from the list of pending blocks to be deleted.
for (DatanodeDescriptor dd : targets) {
String datanodeId = dd.getStorageID();
invalidateBlocks.remove(datanodeId, oldBlock);
}
// Adjust safe-mode totals, since under-construction blocks don't
// count in safe-mode.
namesystem.adjustSafeModeBlockTotals(
// decrement safe if we had enough
targets.length >= minReplication ? -1 : 0,
// always decrement total blocks
-1);
final long fileLength = bc.computeContentSummary().getLength();
final long pos = fileLength - ucBlock.getNumBytes();
return createLocatedBlock(ucBlock, pos, AccessMode.WRITE);
}
/**
* Get all valid locations of the block
*/
private List<String> getValidLocations(Block block) {
ArrayList<String> machineSet =
new ArrayList<String>(blocksMap.numNodes(block));
for(Iterator<DatanodeDescriptor> it =
blocksMap.nodeIterator(block); it.hasNext();) {
String storageID = it.next().getStorageID();
// filter invalidate replicas
if(!invalidateBlocks.contains(storageID, block)) {
machineSet.add(storageID);
}
}
return machineSet;
}
private List<LocatedBlock> createLocatedBlockList(final BlockInfo[] blocks,
final long offset, final long length, final int nrBlocksToReturn,
final AccessMode mode) throws IOException {
int curBlk = 0;
long curPos = 0, blkSize = 0;
int nrBlocks = (blocks[0].getNumBytes() == 0) ? 0 : blocks.length;
for (curBlk = 0; curBlk < nrBlocks; curBlk++) {
blkSize = blocks[curBlk].getNumBytes();
assert blkSize > 0 : "Block of size 0";
if (curPos + blkSize > offset) {
break;
}
curPos += blkSize;
}
if (nrBlocks > 0 && curBlk == nrBlocks) // offset >= end of file
return Collections.<LocatedBlock>emptyList();
long endOff = offset + length;
List<LocatedBlock> results = new ArrayList<LocatedBlock>(blocks.length);
do {
results.add(createLocatedBlock(blocks[curBlk], curPos, mode));
curPos += blocks[curBlk].getNumBytes();
curBlk++;
} while (curPos < endOff
&& curBlk < blocks.length
&& results.size() < nrBlocksToReturn);
return results;
}
private LocatedBlock createLocatedBlock(final BlockInfo[] blocks,
final long endPos, final AccessMode mode) throws IOException {
int curBlk = 0;
long curPos = 0;
int nrBlocks = (blocks[0].getNumBytes() == 0) ? 0 : blocks.length;
for (curBlk = 0; curBlk < nrBlocks; curBlk++) {
long blkSize = blocks[curBlk].getNumBytes();
if (curPos + blkSize >= endPos) {
break;
}
curPos += blkSize;
}
return createLocatedBlock(blocks[curBlk], curPos, mode);
}
private LocatedBlock createLocatedBlock(final BlockInfo blk, final long pos,
final BlockTokenSecretManager.AccessMode mode) throws IOException {
final LocatedBlock lb = createLocatedBlock(blk, pos);
if (mode != null) {
setBlockToken(lb, mode);
}
return lb;
}
/** @return a LocatedBlock for the given block */
private LocatedBlock createLocatedBlock(final BlockInfo blk, final long pos
) throws IOException {
if (blk instanceof BlockInfoUnderConstruction) {
if (blk.isComplete()) {
throw new IOException(
"blk instanceof BlockInfoUnderConstruction && blk.isComplete()"
+ ", blk=" + blk);
}
final BlockInfoUnderConstruction uc = (BlockInfoUnderConstruction)blk;
final DatanodeDescriptor[] locations = uc.getExpectedLocations();
final ExtendedBlock eb = new ExtendedBlock(namesystem.getBlockPoolId(), blk);
return new LocatedBlock(eb, locations, pos, false);
}
// get block locations
final int numCorruptNodes = countNodes(blk).corruptReplicas();
final int numCorruptReplicas = corruptReplicas.numCorruptReplicas(blk);
if (numCorruptNodes != numCorruptReplicas) {
LOG.warn("Inconsistent number of corrupt replicas for "
+ blk + " blockMap has " + numCorruptNodes
+ " but corrupt replicas map has " + numCorruptReplicas);
}
final int numNodes = blocksMap.numNodes(blk);
final boolean isCorrupt = numCorruptNodes == numNodes;
final int numMachines = isCorrupt ? numNodes: numNodes - numCorruptNodes;
final DatanodeDescriptor[] machines = new DatanodeDescriptor[numMachines];
int j = 0;
if (numMachines > 0) {
for(Iterator<DatanodeDescriptor> it = blocksMap.nodeIterator(blk);
it.hasNext();) {
final DatanodeDescriptor d = it.next();
final boolean replicaCorrupt = corruptReplicas.isReplicaCorrupt(blk, d);
if (isCorrupt || (!isCorrupt && !replicaCorrupt))
machines[j++] = d;
}
}
assert j == machines.length :
"isCorrupt: " + isCorrupt +
" numMachines: " + numMachines +
" numNodes: " + numNodes +
" numCorrupt: " + numCorruptNodes +
" numCorruptRepls: " + numCorruptReplicas;
final ExtendedBlock eb = new ExtendedBlock(namesystem.getBlockPoolId(), blk);
return new LocatedBlock(eb, machines, pos, isCorrupt);
}
/** Create a LocatedBlocks. */
public LocatedBlocks createLocatedBlocks(final BlockInfo[] blocks,
final long fileSizeExcludeBlocksUnderConstruction,
final boolean isFileUnderConstruction, final long offset,
final long length, final boolean needBlockToken, final boolean inSnapshot)
throws IOException {
assert namesystem.hasReadOrWriteLock();
if (blocks == null) {
return null;
} else if (blocks.length == 0) {
return new LocatedBlocks(0, isFileUnderConstruction,
Collections.<LocatedBlock>emptyList(), null, false);
} else {
if (LOG.isDebugEnabled()) {
LOG.debug("blocks = " + java.util.Arrays.asList(blocks));
}
final AccessMode mode = needBlockToken? AccessMode.READ: null;
final List<LocatedBlock> locatedblocks = createLocatedBlockList(
blocks, offset, length, Integer.MAX_VALUE, mode);
final LocatedBlock lastlb;
final boolean isComplete;
if (!inSnapshot) {
final BlockInfo last = blocks[blocks.length - 1];
final long lastPos = last.isComplete()?
fileSizeExcludeBlocksUnderConstruction - last.getNumBytes()
: fileSizeExcludeBlocksUnderConstruction;
lastlb = createLocatedBlock(last, lastPos, mode);
isComplete = last.isComplete();
} else {
lastlb = createLocatedBlock(blocks,
fileSizeExcludeBlocksUnderConstruction, mode);
isComplete = true;
}
return new LocatedBlocks(
fileSizeExcludeBlocksUnderConstruction, isFileUnderConstruction,
locatedblocks, lastlb, isComplete);
}
}
/** @return current access keys. */
public ExportedBlockKeys getBlockKeys() {
return isBlockTokenEnabled()? blockTokenSecretManager.exportKeys()
: ExportedBlockKeys.DUMMY_KEYS;
}
/** Generate a block token for the located block. */
public void setBlockToken(final LocatedBlock b,
final BlockTokenSecretManager.AccessMode mode) throws IOException {
if (isBlockTokenEnabled()) {
// Use cached UGI if serving RPC calls.
b.setBlockToken(blockTokenSecretManager.generateToken(
NameNode.getRemoteUser().getShortUserName(),
b.getBlock(), EnumSet.of(mode)));
}
}
void addKeyUpdateCommand(final List<DatanodeCommand> cmds,
final DatanodeDescriptor nodeinfo) {
// check access key update
if (isBlockTokenEnabled() && nodeinfo.needKeyUpdate) {
cmds.add(new KeyUpdateCommand(blockTokenSecretManager.exportKeys()));
nodeinfo.needKeyUpdate = false;
}
}
public DataEncryptionKey generateDataEncryptionKey() {
if (isBlockTokenEnabled() && encryptDataTransfer) {
return blockTokenSecretManager.generateDataEncryptionKey();
} else {
return null;
}
}
/**
* Clamp the specified replication between the minimum and the maximum
* replication levels.
*/
public short adjustReplication(short replication) {
return replication < minReplication? minReplication
: replication > maxReplication? maxReplication: replication;
}
/**
* Check whether the replication parameter is within the range
* determined by system configuration.
*/
public void verifyReplication(String src,
short replication,
String clientName) throws IOException {
if (replication >= minReplication && replication <= maxReplication) {
//common case. avoid building 'text'
return;
}
String text = "file " + src
+ ((clientName != null) ? " on client " + clientName : "")
+ ".\n"
+ "Requested replication " + replication;
if (replication > maxReplication)
throw new IOException(text + " exceeds maximum " + maxReplication);
if (replication < minReplication)
throw new IOException(text + " is less than the required minimum " +
minReplication);
}
/**
* return a list of blocks & their locations on <code>datanode</code> whose
* total size is <code>size</code>
*
* @param datanode on which blocks are located
* @param size total size of blocks
*/
public BlocksWithLocations getBlocks(DatanodeID datanode, long size
) throws IOException {
namesystem.checkOperation(OperationCategory.READ);
namesystem.readLock();
try {
namesystem.checkOperation(OperationCategory.READ);
return getBlocksWithLocations(datanode, size);
} finally {
namesystem.readUnlock();
}
}
/** Get all blocks with location information from a datanode. */
private BlocksWithLocations getBlocksWithLocations(final DatanodeID datanode,
final long size) throws UnregisteredNodeException {
final DatanodeDescriptor node = getDatanodeManager().getDatanode(datanode);
if (node == null) {
blockLog.warn("BLOCK* getBlocks: "
+ "Asking for blocks from an unrecorded node " + datanode);
throw new HadoopIllegalArgumentException(
"Datanode " + datanode + " not found.");
}
int numBlocks = node.numBlocks();
if(numBlocks == 0) {
return new BlocksWithLocations(new BlockWithLocations[0]);
}
Iterator<BlockInfo> iter = node.getBlockIterator();
int startBlock = DFSUtil.getRandom().nextInt(numBlocks); // starting from a random block
// skip blocks
for(int i=0; i<startBlock; i++) {
iter.next();
}
List<BlockWithLocations> results = new ArrayList<BlockWithLocations>();
long totalSize = 0;
BlockInfo curBlock;
while(totalSize<size && iter.hasNext()) {
curBlock = iter.next();
if(!curBlock.isComplete()) continue;
totalSize += addBlock(curBlock, results);
}
if(totalSize<size) {
iter = node.getBlockIterator(); // start from the beginning
for(int i=0; i<startBlock&&totalSize<size; i++) {
curBlock = iter.next();
if(!curBlock.isComplete()) continue;
totalSize += addBlock(curBlock, results);
}
}
return new BlocksWithLocations(
results.toArray(new BlockWithLocations[results.size()]));
}
/** Remove the blocks associated to the given datanode. */
void removeBlocksAssociatedTo(final DatanodeDescriptor node) {
final Iterator<? extends Block> it = node.getBlockIterator();
while(it.hasNext()) {
removeStoredBlock(it.next(), node);
}
node.resetBlocks();
invalidateBlocks.remove(node.getStorageID());
// If the DN hasn't block-reported since the most recent
// failover, then we may have been holding up on processing
// over-replicated blocks because of it. But we can now
// process those blocks.
if (node.areBlockContentsStale()) {
rescanPostponedMisreplicatedBlocks();
}
}
/**
* Adds block to list of blocks which will be invalidated on specified
* datanode and log the operation
*/
void addToInvalidates(final Block block, final DatanodeInfo datanode) {
invalidateBlocks.add(block, datanode, true);
}
/**
* Adds block to list of blocks which will be invalidated on all its
* datanodes.
*/
private void addToInvalidates(Block b) {
StringBuilder datanodes = new StringBuilder();
for (Iterator<DatanodeDescriptor> it = blocksMap.nodeIterator(b); it
.hasNext();) {
DatanodeDescriptor node = it.next();
invalidateBlocks.add(b, node, false);
datanodes.append(node).append(" ");
}
if (datanodes.length() != 0) {
blockLog.info("BLOCK* addToInvalidates: " + b + " "
+ datanodes);
}
}
/**
* Mark the block belonging to datanode as corrupt
* @param blk Block to be marked as corrupt
* @param dn Datanode which holds the corrupt replica
* @param reason a textual reason why the block should be marked corrupt,
* for logging purposes
*/
public void findAndMarkBlockAsCorrupt(final ExtendedBlock blk,
final DatanodeInfo dn, String reason) throws IOException {
assert namesystem.hasWriteLock();
final BlockInfo storedBlock = getStoredBlock(blk.getLocalBlock());
if (storedBlock == null) {
// Check if the replica is in the blockMap, if not
// ignore the request for now. This could happen when BlockScanner
// thread of Datanode reports bad block before Block reports are sent
// by the Datanode on startup
blockLog.info("BLOCK* findAndMarkBlockAsCorrupt: "
+ blk + " not found");
return;
}
markBlockAsCorrupt(new BlockToMarkCorrupt(storedBlock, reason), dn);
}
private void markBlockAsCorrupt(BlockToMarkCorrupt b,
DatanodeInfo dn) throws IOException {
DatanodeDescriptor node = getDatanodeManager().getDatanode(dn);
if (node == null) {
throw new IOException("Cannot mark " + b
+ " as corrupt because datanode " + dn + " does not exist");
}
BlockCollection bc = b.corrupted.getBlockCollection();
if (bc == null) {
blockLog.info("BLOCK markBlockAsCorrupt: " + b
+ " cannot be marked as corrupt as it does not belong to any file");
addToInvalidates(b.corrupted, node);
return;
}
// Add replica to the data-node if it is not already there
node.addBlock(b.stored);
// Add this replica to corruptReplicas Map
corruptReplicas.addToCorruptReplicasMap(b.corrupted, node, b.reason);
if (countNodes(b.stored).liveReplicas() >= bc.getBlockReplication()) {
// the block is over-replicated so invalidate the replicas immediately
invalidateBlock(b, node);
} else if (namesystem.isPopulatingReplQueues()) {
// add the block to neededReplication
updateNeededReplications(b.stored, -1, 0);
}
}
/**
* Invalidates the given block on the given datanode.
* @return true if the block was successfully invalidated and no longer
* present in the BlocksMap
*/
private boolean invalidateBlock(BlockToMarkCorrupt b, DatanodeInfo dn
) throws IOException {
blockLog.info("BLOCK* invalidateBlock: " + b + " on " + dn);
DatanodeDescriptor node = getDatanodeManager().getDatanode(dn);
if (node == null) {
throw new IOException("Cannot invalidate " + b
+ " because datanode " + dn + " does not exist.");
}
// Check how many copies we have of the block
NumberReplicas nr = countNodes(b.stored);
if (nr.replicasOnStaleNodes() > 0) {
blockLog.info("BLOCK* invalidateBlocks: postponing " +
"invalidation of " + b + " on " + dn + " because " +
nr.replicasOnStaleNodes() + " replica(s) are located on nodes " +
"with potentially out-of-date block reports");
postponeBlock(b.corrupted);
return false;
} else if (nr.liveReplicas() >= 1) {
// If we have at least one copy on a live node, then we can delete it.
addToInvalidates(b.corrupted, dn);
removeStoredBlock(b.stored, node);
if(blockLog.isDebugEnabled()) {
blockLog.debug("BLOCK* invalidateBlocks: "
+ b + " on " + dn + " listed for deletion.");
}
return true;
} else {
blockLog.info("BLOCK* invalidateBlocks: " + b
+ " on " + dn + " is the only copy and was not deleted");
return false;
}
}
public void setPostponeBlocksFromFuture(boolean postpone) {
this.shouldPostponeBlocksFromFuture = postpone;
}
private void postponeBlock(Block blk) {
if (postponedMisreplicatedBlocks.add(blk)) {
postponedMisreplicatedBlocksCount.incrementAndGet();
}
}
void updateState() {
pendingReplicationBlocksCount = pendingReplications.size();
underReplicatedBlocksCount = neededReplications.size();
corruptReplicaBlocksCount = corruptReplicas.size();
}
/** Return number of under-replicated but not missing blocks */
public int getUnderReplicatedNotMissingBlocks() {
return neededReplications.getUnderReplicatedBlockCount();
}
/**
* Schedule blocks for deletion at datanodes
* @param nodesToProcess number of datanodes to schedule deletion work
* @return total number of block for deletion
*/
int computeInvalidateWork(int nodesToProcess) {
final List<String> nodes = invalidateBlocks.getStorageIDs();
Collections.shuffle(nodes);
nodesToProcess = Math.min(nodes.size(), nodesToProcess);
int blockCnt = 0;
for(int nodeCnt = 0; nodeCnt < nodesToProcess; nodeCnt++ ) {
blockCnt += invalidateWorkForOneNode(nodes.get(nodeCnt));
}
return blockCnt;
}
/**
* Scan blocks in {@link #neededReplications} and assign replication
* work to data-nodes they belong to.
*
* The number of process blocks equals either twice the number of live
* data-nodes or the number of under-replicated blocks whichever is less.
*
* @return number of blocks scheduled for replication during this iteration.
*/
int computeReplicationWork(int blocksToProcess) {
List<List<Block>> blocksToReplicate = null;
namesystem.writeLock();
try {
// Choose the blocks to be replicated
blocksToReplicate = neededReplications
.chooseUnderReplicatedBlocks(blocksToProcess);
} finally {
namesystem.writeUnlock();
}
return computeReplicationWorkForBlocks(blocksToReplicate);
}
/** Replicate a set of blocks
*
* @param blocksToReplicate blocks to be replicated, for each priority
* @return the number of blocks scheduled for replication
*/
@VisibleForTesting
int computeReplicationWorkForBlocks(List<List<Block>> blocksToReplicate) {
int requiredReplication, numEffectiveReplicas;
List<DatanodeDescriptor> containingNodes, liveReplicaNodes;
DatanodeDescriptor srcNode;
BlockCollection bc = null;
int additionalReplRequired;
int scheduledWork = 0;
List<ReplicationWork> work = new LinkedList<ReplicationWork>();
namesystem.writeLock();
try {
synchronized (neededReplications) {
for (int priority = 0; priority < blocksToReplicate.size(); priority++) {
for (Block block : blocksToReplicate.get(priority)) {
// block should belong to a file
bc = blocksMap.getBlockCollection(block);
// abandoned block or block reopened for append
if(bc == null || bc instanceof MutableBlockCollection) {
neededReplications.remove(block, priority); // remove from neededReplications
neededReplications.decrementReplicationIndex(priority);
continue;
}
requiredReplication = bc.getBlockReplication();
// get a source data-node
containingNodes = new ArrayList<DatanodeDescriptor>();
liveReplicaNodes = new ArrayList<DatanodeDescriptor>();
NumberReplicas numReplicas = new NumberReplicas();
srcNode = chooseSourceDatanode(
block, containingNodes, liveReplicaNodes, numReplicas,
priority);
if(srcNode == null) { // block can not be replicated from any node
LOG.debug("Block " + block + " cannot be repl from any node");
continue;
}
assert liveReplicaNodes.size() == numReplicas.liveReplicas();
// do not schedule more if enough replicas is already pending
numEffectiveReplicas = numReplicas.liveReplicas() +
pendingReplications.getNumReplicas(block);
if (numEffectiveReplicas >= requiredReplication) {
if ( (pendingReplications.getNumReplicas(block) > 0) ||
(blockHasEnoughRacks(block)) ) {
neededReplications.remove(block, priority); // remove from neededReplications
neededReplications.decrementReplicationIndex(priority);
blockLog.info("BLOCK* Removing " + block
+ " from neededReplications as it has enough replicas");
continue;
}
}
if (numReplicas.liveReplicas() < requiredReplication) {
additionalReplRequired = requiredReplication
- numEffectiveReplicas;
} else {
additionalReplRequired = 1; // Needed on a new rack
}
work.add(new ReplicationWork(block, bc, srcNode,
containingNodes, liveReplicaNodes, additionalReplRequired,
priority));
}
}
}
} finally {
namesystem.writeUnlock();
}
HashMap<Node, Node> excludedNodes
= new HashMap<Node, Node>();
for(ReplicationWork rw : work){
// Exclude all of the containing nodes from being targets.
// This list includes decommissioning or corrupt nodes.
excludedNodes.clear();
for (DatanodeDescriptor dn : rw.containingNodes) {
excludedNodes.put(dn, dn);
}
// choose replication targets: NOT HOLDING THE GLOBAL LOCK
// It is costly to extract the filename for which chooseTargets is called,
// so for now we pass in the block collection itself.
rw.targets = blockplacement.chooseTarget(rw.bc,
rw.additionalReplRequired, rw.srcNode, rw.liveReplicaNodes,
excludedNodes, rw.block.getNumBytes());
}
namesystem.writeLock();
try {
for(ReplicationWork rw : work){
DatanodeDescriptor[] targets = rw.targets;
if(targets == null || targets.length == 0){
rw.targets = null;
continue;
}
synchronized (neededReplications) {
Block block = rw.block;
int priority = rw.priority;
// Recheck since global lock was released
// block should belong to a file
bc = blocksMap.getBlockCollection(block);
// abandoned block or block reopened for append
if(bc == null || bc instanceof MutableBlockCollection) {
neededReplications.remove(block, priority); // remove from neededReplications
rw.targets = null;
neededReplications.decrementReplicationIndex(priority);
continue;
}
requiredReplication = bc.getBlockReplication();
// do not schedule more if enough replicas is already pending
NumberReplicas numReplicas = countNodes(block);
numEffectiveReplicas = numReplicas.liveReplicas() +
pendingReplications.getNumReplicas(block);
if (numEffectiveReplicas >= requiredReplication) {
if ( (pendingReplications.getNumReplicas(block) > 0) ||
(blockHasEnoughRacks(block)) ) {
neededReplications.remove(block, priority); // remove from neededReplications
neededReplications.decrementReplicationIndex(priority);
rw.targets = null;
blockLog.info("BLOCK* Removing " + block
+ " from neededReplications as it has enough replicas");
continue;
}
}
if ( (numReplicas.liveReplicas() >= requiredReplication) &&
(!blockHasEnoughRacks(block)) ) {
if (rw.srcNode.getNetworkLocation().equals(targets[0].getNetworkLocation())) {
//No use continuing, unless a new rack in this case
continue;
}
}
// Add block to the to be replicated list
rw.srcNode.addBlockToBeReplicated(block, targets);
scheduledWork++;
for (DatanodeDescriptor dn : targets) {
dn.incBlocksScheduled();
}
// Move the block-replication into a "pending" state.
// The reason we use 'pending' is so we can retry
// replications that fail after an appropriate amount of time.
pendingReplications.increment(block, targets);
if(blockLog.isDebugEnabled()) {
blockLog.debug(
"BLOCK* block " + block
+ " is moved from neededReplications to pendingReplications");
}
// remove from neededReplications
if(numEffectiveReplicas + targets.length >= requiredReplication) {
neededReplications.remove(block, priority); // remove from neededReplications
neededReplications.decrementReplicationIndex(priority);
}
}
}
} finally {
namesystem.writeUnlock();
}
if (blockLog.isInfoEnabled()) {
// log which blocks have been scheduled for replication
for(ReplicationWork rw : work){
DatanodeDescriptor[] targets = rw.targets;
if (targets != null && targets.length != 0) {
StringBuilder targetList = new StringBuilder("datanode(s)");
for (int k = 0; k < targets.length; k++) {
targetList.append(' ');
targetList.append(targets[k]);
}
blockLog.info("BLOCK* ask " + rw.srcNode
+ " to replicate " + rw.block + " to " + targetList);
}
}
}
if(blockLog.isDebugEnabled()) {
blockLog.debug(
"BLOCK* neededReplications = " + neededReplications.size()
+ " pendingReplications = " + pendingReplications.size());
}
return scheduledWork;
}
/**
* Choose target datanodes according to the replication policy.
*
* @throws IOException
* if the number of targets < minimum replication.
* @see BlockPlacementPolicy#chooseTarget(String, int, DatanodeDescriptor,
* List, boolean, HashMap, long)
*/
public DatanodeDescriptor[] chooseTarget(final String src,
final int numOfReplicas, final DatanodeDescriptor client,
final HashMap<Node, Node> excludedNodes,
final long blocksize, List<String> favoredNodes) throws IOException {
List<DatanodeDescriptor> favoredDatanodeDescriptors =
getDatanodeDescriptors(favoredNodes);
final DatanodeDescriptor targets[] = blockplacement.chooseTarget(src,
numOfReplicas, client, excludedNodes, blocksize,
favoredDatanodeDescriptors);
if (targets.length < minReplication) {
throw new IOException("File " + src + " could only be replicated to "
+ targets.length + " nodes instead of minReplication (="
+ minReplication + "). There are "
+ getDatanodeManager().getNetworkTopology().getNumOfLeaves()
+ " datanode(s) running and "
+ (excludedNodes == null? "no": excludedNodes.size())
+ " node(s) are excluded in this operation.");
}
return targets;
}
/**
* Get list of datanode descriptors for given list of nodes. Nodes are
* hostaddress:port or just hostaddress.
*/
List<DatanodeDescriptor> getDatanodeDescriptors(List<String> nodes) {
List<DatanodeDescriptor> datanodeDescriptors = null;
if (nodes != null) {
datanodeDescriptors = new ArrayList<DatanodeDescriptor>(nodes.size());
for (int i = 0; i < nodes.size(); i++) {
DatanodeDescriptor node = datanodeManager.getDatanodeDescriptor(nodes.get(i));
if (node != null) {
datanodeDescriptors.add(node);
}
}
}
return datanodeDescriptors;
}
/**
* Parse the data-nodes the block belongs to and choose one,
* which will be the replication source.
*
* We prefer nodes that are in DECOMMISSION_INPROGRESS state to other nodes
* since the former do not have write traffic and hence are less busy.
* We do not use already decommissioned nodes as a source.
* Otherwise we choose a random node among those that did not reach their
* replication limits. However, if the replication is of the highest priority
* and all nodes have reached their replication limits, we will choose a
* random node despite the replication limit.
*
* In addition form a list of all nodes containing the block
* and calculate its replication numbers.
*
* @param block Block for which a replication source is needed
* @param containingNodes List to be populated with nodes found to contain the
* given block
* @param nodesContainingLiveReplicas List to be populated with nodes found to
* contain live replicas of the given block
* @param numReplicas NumberReplicas instance to be initialized with the
* counts of live, corrupt, excess, and
* decommissioned replicas of the given
* block.
* @param priority integer representing replication priority of the given
* block
* @return the DatanodeDescriptor of the chosen node from which to replicate
* the given block
*/
@VisibleForTesting
DatanodeDescriptor chooseSourceDatanode(
Block block,
List<DatanodeDescriptor> containingNodes,
List<DatanodeDescriptor> nodesContainingLiveReplicas,
NumberReplicas numReplicas,
int priority) {
containingNodes.clear();
nodesContainingLiveReplicas.clear();
DatanodeDescriptor srcNode = null;
int live = 0;
int decommissioned = 0;
int corrupt = 0;
int excess = 0;
Iterator<DatanodeDescriptor> it = blocksMap.nodeIterator(block);
Collection<DatanodeDescriptor> nodesCorrupt = corruptReplicas.getNodes(block);
while(it.hasNext()) {
DatanodeDescriptor node = it.next();
LightWeightLinkedSet<Block> excessBlocks =
excessReplicateMap.get(node.getStorageID());
if ((nodesCorrupt != null) && (nodesCorrupt.contains(node)))
corrupt++;
else if (node.isDecommissionInProgress() || node.isDecommissioned())
decommissioned++;
else if (excessBlocks != null && excessBlocks.contains(block)) {
excess++;
} else {
nodesContainingLiveReplicas.add(node);
live++;
}
containingNodes.add(node);
// Check if this replica is corrupt
// If so, do not select the node as src node
if ((nodesCorrupt != null) && nodesCorrupt.contains(node))
continue;
if(priority != UnderReplicatedBlocks.QUEUE_HIGHEST_PRIORITY
&& node.getNumberOfBlocksToBeReplicated() >= maxReplicationStreams)
{
continue; // already reached replication limit
}
if (node.getNumberOfBlocksToBeReplicated() >= replicationStreamsHardLimit)
{
continue;
}
// the block must not be scheduled for removal on srcNode
if(excessBlocks != null && excessBlocks.contains(block))
continue;
// never use already decommissioned nodes
if(node.isDecommissioned())
continue;
// we prefer nodes that are in DECOMMISSION_INPROGRESS state
if(node.isDecommissionInProgress() || srcNode == null) {
srcNode = node;
continue;
}
if(srcNode.isDecommissionInProgress())
continue;
// switch to a different node randomly
// this to prevent from deterministically selecting the same node even
// if the node failed to replicate the block on previous iterations
if(DFSUtil.getRandom().nextBoolean())
srcNode = node;
}
if(numReplicas != null)
numReplicas.initialize(live, decommissioned, corrupt, excess, 0);
return srcNode;
}
/**
* If there were any replication requests that timed out, reap them
* and put them back into the neededReplication queue
*/
private void processPendingReplications() {
Block[] timedOutItems = pendingReplications.getTimedOutBlocks();
if (timedOutItems != null) {
namesystem.writeLock();
try {
for (int i = 0; i < timedOutItems.length; i++) {
NumberReplicas num = countNodes(timedOutItems[i]);
if (isNeededReplication(timedOutItems[i], getReplication(timedOutItems[i]),
num.liveReplicas())) {
neededReplications.add(timedOutItems[i],
num.liveReplicas(),
num.decommissionedReplicas(),
getReplication(timedOutItems[i]));
}
}
} finally {
namesystem.writeUnlock();
}
/* If we know the target datanodes where the replication timedout,
* we could invoke decBlocksScheduled() on it. Its ok for now.
*/
}
}
/**
* StatefulBlockInfo is used to build the "toUC" list, which is a list of
* updates to the information about under-construction blocks.
* Besides the block in question, it provides the ReplicaState
* reported by the datanode in the block report.
*/
private static class StatefulBlockInfo {
final BlockInfoUnderConstruction storedBlock;
final ReplicaState reportedState;
StatefulBlockInfo(BlockInfoUnderConstruction storedBlock,
ReplicaState reportedState) {
this.storedBlock = storedBlock;
this.reportedState = reportedState;
}
}
/**
* BlockToMarkCorrupt is used to build the "toCorrupt" list, which is a
* list of blocks that should be considered corrupt due to a block report.
*/
private static class BlockToMarkCorrupt {
/** The corrupted block in a datanode. */
final BlockInfo corrupted;
/** The corresponding block stored in the BlockManager. */
final BlockInfo stored;
/** The reason to mark corrupt. */
final String reason;
BlockToMarkCorrupt(BlockInfo corrupted, BlockInfo stored, String reason) {
Preconditions.checkNotNull(corrupted, "corrupted is null");
Preconditions.checkNotNull(stored, "stored is null");
this.corrupted = corrupted;
this.stored = stored;
this.reason = reason;
}
BlockToMarkCorrupt(BlockInfo stored, String reason) {
this(stored, stored, reason);
}
BlockToMarkCorrupt(BlockInfo stored, long gs, String reason) {
this(new BlockInfo(stored), stored, reason);
//the corrupted block in datanode has a different generation stamp
corrupted.setGenerationStamp(gs);
}
@Override
public String toString() {
return corrupted + "("
+ (corrupted == stored? "same as stored": "stored=" + stored) + ")";
}
}
/**
* The given datanode is reporting all its blocks.
* Update the (machine-->blocklist) and (block-->machinelist) maps.
*/
public void processReport(final DatanodeID nodeID, final String poolId,
final BlockListAsLongs newReport) throws IOException {
namesystem.writeLock();
final long startTime = Time.now(); //after acquiring write lock
final long endTime;
try {
final DatanodeDescriptor node = datanodeManager.getDatanode(nodeID);
if (node == null || !node.isAlive) {
throw new IOException(
"ProcessReport from dead or unregistered node: " + nodeID);
}
// To minimize startup time, we discard any second (or later) block reports
// that we receive while still in startup phase.
if (namesystem.isInStartupSafeMode() && !node.isFirstBlockReport()) {
blockLog.info("BLOCK* processReport: "
+ "discarded non-initial block report from " + nodeID
+ " because namenode still in startup phase");
return;
}
if (node.numBlocks() == 0) {
// The first block report can be processed a lot more efficiently than
// ordinary block reports. This shortens restart times.
processFirstBlockReport(node, newReport);
} else {
processReport(node, newReport);
}
// Now that we have an up-to-date block report, we know that any
// deletions from a previous NN iteration have been accounted for.
boolean staleBefore = node.areBlockContentsStale();
node.receivedBlockReport();
if (staleBefore && !node.areBlockContentsStale()) {
LOG.info("BLOCK* processReport: Received first block report from "
+ node + " after starting up or becoming active. Its block "
+ "contents are no longer considered stale");
rescanPostponedMisreplicatedBlocks();
}
} finally {
endTime = Time.now();
namesystem.writeUnlock();
}
// Log the block report processing stats from Namenode perspective
final NameNodeMetrics metrics = NameNode.getNameNodeMetrics();
if (metrics != null) {
metrics.addBlockReport((int) (endTime - startTime));
}
blockLog.info("BLOCK* processReport: from "
+ nodeID + ", blocks: " + newReport.getNumberOfBlocks()
+ ", processing time: " + (endTime - startTime) + " msecs");
}
/**
* Rescan the list of blocks which were previously postponed.
*/
private void rescanPostponedMisreplicatedBlocks() {
for (Iterator<Block> it = postponedMisreplicatedBlocks.iterator();
it.hasNext();) {
Block b = it.next();
BlockInfo bi = blocksMap.getStoredBlock(b);
if (bi == null) {
if (LOG.isDebugEnabled()) {
LOG.debug("BLOCK* rescanPostponedMisreplicatedBlocks: " +
"Postponed mis-replicated block " + b + " no longer found " +
"in block map.");
}
it.remove();
postponedMisreplicatedBlocksCount.decrementAndGet();
continue;
}
MisReplicationResult res = processMisReplicatedBlock(bi);
if (LOG.isDebugEnabled()) {
LOG.debug("BLOCK* rescanPostponedMisreplicatedBlocks: " +
"Re-scanned block " + b + ", result is " + res);
}
if (res != MisReplicationResult.POSTPONE) {
it.remove();
postponedMisreplicatedBlocksCount.decrementAndGet();
}
}
}
private void processReport(final DatanodeDescriptor node,
final BlockListAsLongs report) throws IOException {
// Normal case:
// Modify the (block-->datanode) map, according to the difference
// between the old and new block report.
//
Collection<BlockInfo> toAdd = new LinkedList<BlockInfo>();
Collection<Block> toRemove = new LinkedList<Block>();
Collection<Block> toInvalidate = new LinkedList<Block>();
Collection<BlockToMarkCorrupt> toCorrupt = new LinkedList<BlockToMarkCorrupt>();
Collection<StatefulBlockInfo> toUC = new LinkedList<StatefulBlockInfo>();
reportDiff(node, report, toAdd, toRemove, toInvalidate, toCorrupt, toUC);
// Process the blocks on each queue
for (StatefulBlockInfo b : toUC) {
addStoredBlockUnderConstruction(b.storedBlock, node, b.reportedState);
}
for (Block b : toRemove) {
removeStoredBlock(b, node);
}
for (BlockInfo b : toAdd) {
addStoredBlock(b, node, null, true);
}
for (Block b : toInvalidate) {
blockLog.info("BLOCK* processReport: "
+ b + " on " + node + " size " + b.getNumBytes()
+ " does not belong to any file");
addToInvalidates(b, node);
}
for (BlockToMarkCorrupt b : toCorrupt) {
markBlockAsCorrupt(b, node);
}
}
/**
* processFirstBlockReport is intended only for processing "initial" block
* reports, the first block report received from a DN after it registers.
* It just adds all the valid replicas to the datanode, without calculating
* a toRemove list (since there won't be any). It also silently discards
* any invalid blocks, thereby deferring their processing until
* the next block report.
* @param node - DatanodeDescriptor of the node that sent the report
* @param report - the initial block report, to be processed
* @throws IOException
*/
private void processFirstBlockReport(final DatanodeDescriptor node,
final BlockListAsLongs report) throws IOException {
if (report == null) return;
assert (namesystem.hasWriteLock());
assert (node.numBlocks() == 0);
BlockReportIterator itBR = report.getBlockReportIterator();
while(itBR.hasNext()) {
Block iblk = itBR.next();
ReplicaState reportedState = itBR.getCurrentReplicaState();
if (shouldPostponeBlocksFromFuture &&
namesystem.isGenStampInFuture(iblk)) {
queueReportedBlock(node, iblk, reportedState,
QUEUE_REASON_FUTURE_GENSTAMP);
continue;
}
BlockInfo storedBlock = blocksMap.getStoredBlock(iblk);
// If block does not belong to any file, we are done.
if (storedBlock == null) continue;
// If block is corrupt, mark it and continue to next block.
BlockUCState ucState = storedBlock.getBlockUCState();
BlockToMarkCorrupt c = checkReplicaCorrupt(
iblk, reportedState, storedBlock, ucState, node);
if (c != null) {
if (shouldPostponeBlocksFromFuture) {
// In the Standby, we may receive a block report for a file that we
// just have an out-of-date gen-stamp or state for, for example.
queueReportedBlock(node, iblk, reportedState,
QUEUE_REASON_CORRUPT_STATE);
} else {
markBlockAsCorrupt(c, node);
}
continue;
}
// If block is under construction, add this replica to its list
if (isBlockUnderConstruction(storedBlock, ucState, reportedState)) {
((BlockInfoUnderConstruction)storedBlock).addReplicaIfNotPresent(
node, iblk, reportedState);
//and fall through to next clause
}
//add replica if appropriate
if (reportedState == ReplicaState.FINALIZED) {
addStoredBlockImmediate(storedBlock, node);
}
}
}
private void reportDiff(DatanodeDescriptor dn,
BlockListAsLongs newReport,
Collection<BlockInfo> toAdd, // add to DatanodeDescriptor
Collection<Block> toRemove, // remove from DatanodeDescriptor
Collection<Block> toInvalidate, // should be removed from DN
Collection<BlockToMarkCorrupt> toCorrupt, // add to corrupt replicas list
Collection<StatefulBlockInfo> toUC) { // add to under-construction list
// place a delimiter in the list which separates blocks
// that have been reported from those that have not
BlockInfo delimiter = new BlockInfo(new Block(), 1);
boolean added = dn.addBlock(delimiter);
assert added : "Delimiting block cannot be present in the node";
int headIndex = 0; //currently the delimiter is in the head of the list
int curIndex;
if (newReport == null)
newReport = new BlockListAsLongs();
// scan the report and process newly reported blocks
BlockReportIterator itBR = newReport.getBlockReportIterator();
while(itBR.hasNext()) {
Block iblk = itBR.next();
ReplicaState iState = itBR.getCurrentReplicaState();
BlockInfo storedBlock = processReportedBlock(dn, iblk, iState,
toAdd, toInvalidate, toCorrupt, toUC);
// move block to the head of the list
if (storedBlock != null && (curIndex = storedBlock.findDatanode(dn)) >= 0) {
headIndex = dn.moveBlockToHead(storedBlock, curIndex, headIndex);
}
}
// collect blocks that have not been reported
// all of them are next to the delimiter
Iterator<? extends Block> it = new DatanodeDescriptor.BlockIterator(
delimiter.getNext(0), dn);
while(it.hasNext())
toRemove.add(it.next());
dn.removeBlock(delimiter);
}
/**
* Process a block replica reported by the data-node.
* No side effects except adding to the passed-in Collections.
*
* <ol>
* <li>If the block is not known to the system (not in blocksMap) then the
* data-node should be notified to invalidate this block.</li>
* <li>If the reported replica is valid that is has the same generation stamp
* and length as recorded on the name-node, then the replica location should
* be added to the name-node.</li>
* <li>If the reported replica is not valid, then it is marked as corrupt,
* which triggers replication of the existing valid replicas.
* Corrupt replicas are removed from the system when the block
* is fully replicated.</li>
* <li>If the reported replica is for a block currently marked "under
* construction" in the NN, then it should be added to the
* BlockInfoUnderConstruction's list of replicas.</li>
* </ol>
*
* @param dn descriptor for the datanode that made the report
* @param block reported block replica
* @param reportedState reported replica state
* @param toAdd add to DatanodeDescriptor
* @param toInvalidate missing blocks (not in the blocks map)
* should be removed from the data-node
* @param toCorrupt replicas with unexpected length or generation stamp;
* add to corrupt replicas
* @param toUC replicas of blocks currently under construction
* @return the up-to-date stored block, if it should be kept.
* Otherwise, null.
*/
private BlockInfo processReportedBlock(final DatanodeDescriptor dn,
final Block block, final ReplicaState reportedState,
final Collection<BlockInfo> toAdd,
final Collection<Block> toInvalidate,
final Collection<BlockToMarkCorrupt> toCorrupt,
final Collection<StatefulBlockInfo> toUC) {
if(LOG.isDebugEnabled()) {
LOG.debug("Reported block " + block
+ " on " + dn + " size " + block.getNumBytes()
+ " replicaState = " + reportedState);
}
if (shouldPostponeBlocksFromFuture &&
namesystem.isGenStampInFuture(block)) {
queueReportedBlock(dn, block, reportedState,
QUEUE_REASON_FUTURE_GENSTAMP);
return null;
}
// find block by blockId
BlockInfo storedBlock = blocksMap.getStoredBlock(block);
if(storedBlock == null) {
// If blocksMap does not contain reported block id,
// the replica should be removed from the data-node.
toInvalidate.add(new Block(block));
return null;
}
BlockUCState ucState = storedBlock.getBlockUCState();
// Block is on the NN
if(LOG.isDebugEnabled()) {
LOG.debug("In memory blockUCState = " + ucState);
}
// Ignore replicas already scheduled to be removed from the DN
if(invalidateBlocks.contains(dn.getStorageID(), block)) {
/* TODO: following assertion is incorrect, see HDFS-2668
assert storedBlock.findDatanode(dn) < 0 : "Block " + block
+ " in recentInvalidatesSet should not appear in DN " + dn; */
return storedBlock;
}
BlockToMarkCorrupt c = checkReplicaCorrupt(
block, reportedState, storedBlock, ucState, dn);
if (c != null) {
if (shouldPostponeBlocksFromFuture) {
// If the block is an out-of-date generation stamp or state,
// but we're the standby, we shouldn't treat it as corrupt,
// but instead just queue it for later processing.
queueReportedBlock(dn, storedBlock, reportedState,
QUEUE_REASON_CORRUPT_STATE);
} else {
toCorrupt.add(c);
}
return storedBlock;
}
if (isBlockUnderConstruction(storedBlock, ucState, reportedState)) {
toUC.add(new StatefulBlockInfo(
(BlockInfoUnderConstruction)storedBlock, reportedState));
return storedBlock;
}
//add replica if appropriate
if (reportedState == ReplicaState.FINALIZED
&& storedBlock.findDatanode(dn) < 0) {
toAdd.add(storedBlock);
}
return storedBlock;
}
/**
* Queue the given reported block for later processing in the
* standby node. @see PendingDataNodeMessages.
* @param reason a textual reason to report in the debug logs
*/
private void queueReportedBlock(DatanodeDescriptor dn, Block block,
ReplicaState reportedState, String reason) {
assert shouldPostponeBlocksFromFuture;
if (LOG.isDebugEnabled()) {
LOG.debug("Queueing reported block " + block +
" in state " + reportedState +
" from datanode " + dn + " for later processing " +
"because " + reason + ".");
}
pendingDNMessages.enqueueReportedBlock(dn, block, reportedState);
}
/**
* Try to process any messages that were previously queued for the given
* block. This is called from FSEditLogLoader whenever a block's state
* in the namespace has changed or a new block has been created.
*/
public void processQueuedMessagesForBlock(Block b) throws IOException {
Queue<ReportedBlockInfo> queue = pendingDNMessages.takeBlockQueue(b);
if (queue == null) {
// Nothing to re-process
return;
}
processQueuedMessages(queue);
}
private void processQueuedMessages(Iterable<ReportedBlockInfo> rbis)
throws IOException {
for (ReportedBlockInfo rbi : rbis) {
if (LOG.isDebugEnabled()) {
LOG.debug("Processing previouly queued message " + rbi);
}
processAndHandleReportedBlock(
rbi.getNode(), rbi.getBlock(), rbi.getReportedState(), null);
}
}
/**
* Process any remaining queued datanode messages after entering
* active state. At this point they will not be re-queued since
* we are the definitive master node and thus should be up-to-date
* with the namespace information.
*/
public void processAllPendingDNMessages() throws IOException {
assert !shouldPostponeBlocksFromFuture :
"processAllPendingDNMessages() should be called after disabling " +
"block postponement.";
int count = pendingDNMessages.count();
if (count > 0) {
LOG.info("Processing " + count + " messages from DataNodes " +
"that were previously queued during standby state");
}
processQueuedMessages(pendingDNMessages.takeAll());
assert pendingDNMessages.count() == 0;
}
/**
* The next two methods test the various cases under which we must conclude
* the replica is corrupt, or under construction. These are laid out
* as switch statements, on the theory that it is easier to understand
* the combinatorics of reportedState and ucState that way. It should be
* at least as efficient as boolean expressions.
*
* @return a BlockToMarkCorrupt object, or null if the replica is not corrupt
*/
private BlockToMarkCorrupt checkReplicaCorrupt(
Block reported, ReplicaState reportedState,
BlockInfo storedBlock, BlockUCState ucState,
DatanodeDescriptor dn) {
switch(reportedState) {
case FINALIZED:
switch(ucState) {
case COMPLETE:
case COMMITTED:
if (storedBlock.getGenerationStamp() != reported.getGenerationStamp()) {
final long reportedGS = reported.getGenerationStamp();
return new BlockToMarkCorrupt(storedBlock, reportedGS,
"block is " + ucState + " and reported genstamp " + reportedGS
+ " does not match genstamp in block map "
+ storedBlock.getGenerationStamp());
} else if (storedBlock.getNumBytes() != reported.getNumBytes()) {
return new BlockToMarkCorrupt(storedBlock,
"block is " + ucState + " and reported length " +
reported.getNumBytes() + " does not match " +
"length in block map " + storedBlock.getNumBytes());
} else {
return null; // not corrupt
}
default:
return null;
}
case RBW:
case RWR:
if (!storedBlock.isComplete()) {
return null; // not corrupt
} else if (storedBlock.getGenerationStamp() != reported.getGenerationStamp()) {
final long reportedGS = reported.getGenerationStamp();
return new BlockToMarkCorrupt(storedBlock, reportedGS,
"reported " + reportedState + " replica with genstamp " + reportedGS
+ " does not match COMPLETE block's genstamp in block map "
+ storedBlock.getGenerationStamp());
} else { // COMPLETE block, same genstamp
if (reportedState == ReplicaState.RBW) {
// If it's a RBW report for a COMPLETE block, it may just be that
// the block report got a little bit delayed after the pipeline
// closed. So, ignore this report, assuming we will get a
// FINALIZED replica later. See HDFS-2791
LOG.info("Received an RBW replica for " + storedBlock +
" on " + dn + ": ignoring it, since it is " +
"complete with the same genstamp");
return null;
} else {
return new BlockToMarkCorrupt(storedBlock,
"reported replica has invalid state " + reportedState);
}
}
case RUR: // should not be reported
case TEMPORARY: // should not be reported
default:
String msg = "Unexpected replica state " + reportedState
+ " for block: " + storedBlock +
" on " + dn + " size " + storedBlock.getNumBytes();
// log here at WARN level since this is really a broken HDFS invariant
LOG.warn(msg);
return new BlockToMarkCorrupt(storedBlock, msg);
}
}
private boolean isBlockUnderConstruction(BlockInfo storedBlock,
BlockUCState ucState, ReplicaState reportedState) {
switch(reportedState) {
case FINALIZED:
switch(ucState) {
case UNDER_CONSTRUCTION:
case UNDER_RECOVERY:
return true;
default:
return false;
}
case RBW:
case RWR:
return (!storedBlock.isComplete());
case RUR: // should not be reported
case TEMPORARY: // should not be reported
default:
return false;
}
}
void addStoredBlockUnderConstruction(
BlockInfoUnderConstruction block,
DatanodeDescriptor node,
ReplicaState reportedState)
throws IOException {
block.addReplicaIfNotPresent(node, block, reportedState);
if (reportedState == ReplicaState.FINALIZED && block.findDatanode(node) < 0) {
addStoredBlock(block, node, null, true);
}
}
/**
* Faster version of
* {@link #addStoredBlock(BlockInfo, DatanodeDescriptor, DatanodeDescriptor, boolean)}
* , intended for use with initial block report at startup. If not in startup
* safe mode, will call standard addStoredBlock(). Assumes this method is
* called "immediately" so there is no need to refresh the storedBlock from
* blocksMap. Doesn't handle underReplication/overReplication, or worry about
* pendingReplications or corruptReplicas, because it's in startup safe mode.
* Doesn't log every block, because there are typically millions of them.
*
* @throws IOException
*/
private void addStoredBlockImmediate(BlockInfo storedBlock,
DatanodeDescriptor node)
throws IOException {
assert (storedBlock != null && namesystem.hasWriteLock());
if (!namesystem.isInStartupSafeMode()
|| namesystem.isPopulatingReplQueues()) {
addStoredBlock(storedBlock, node, null, false);
return;
}
// just add it
node.addBlock(storedBlock);
// Now check for completion of blocks and safe block count
int numCurrentReplica = countLiveNodes(storedBlock);
if (storedBlock.getBlockUCState() == BlockUCState.COMMITTED
&& numCurrentReplica >= minReplication) {
completeBlock((MutableBlockCollection)storedBlock.getBlockCollection(), storedBlock, false);
} else if (storedBlock.isComplete()) {
// check whether safe replication is reached for the block
// only complete blocks are counted towards that.
// In the case that the block just became complete above, completeBlock()
// handles the safe block count maintenance.
namesystem.incrementSafeBlockCount(numCurrentReplica);
}
}
/**
* Modify (block-->datanode) map. Remove block from set of
* needed replications if this takes care of the problem.
* @return the block that is stored in blockMap.
*/
private Block addStoredBlock(final BlockInfo block,
DatanodeDescriptor node,
DatanodeDescriptor delNodeHint,
boolean logEveryBlock)
throws IOException {
assert block != null && namesystem.hasWriteLock();
BlockInfo storedBlock;
if (block instanceof BlockInfoUnderConstruction) {
//refresh our copy in case the block got completed in another thread
storedBlock = blocksMap.getStoredBlock(block);
} else {
storedBlock = block;
}
if (storedBlock == null || storedBlock.getBlockCollection() == null) {
// If this block does not belong to anyfile, then we are done.
blockLog.info("BLOCK* addStoredBlock: " + block + " on "
+ node + " size " + block.getNumBytes()
+ " but it does not belong to any file");
// we could add this block to invalidate set of this datanode.
// it will happen in next block report otherwise.
return block;
}
assert storedBlock != null : "Block must be stored by now";
BlockCollection bc = storedBlock.getBlockCollection();
assert bc != null : "Block must belong to a file";
// add block to the datanode
boolean added = node.addBlock(storedBlock);
int curReplicaDelta;
if (added) {
curReplicaDelta = 1;
if (logEveryBlock) {
logAddStoredBlock(storedBlock, node);
}
} else {
curReplicaDelta = 0;
blockLog.warn("BLOCK* addStoredBlock: "
+ "Redundant addStoredBlock request received for " + storedBlock
+ " on " + node + " size " + storedBlock.getNumBytes());
}
// Now check for completion of blocks and safe block count
NumberReplicas num = countNodes(storedBlock);
int numLiveReplicas = num.liveReplicas();
int numCurrentReplica = numLiveReplicas
+ pendingReplications.getNumReplicas(storedBlock);
if(storedBlock.getBlockUCState() == BlockUCState.COMMITTED &&
numLiveReplicas >= minReplication) {
storedBlock = completeBlock((MutableBlockCollection)bc, storedBlock, false);
} else if (storedBlock.isComplete()) {
// check whether safe replication is reached for the block
// only complete blocks are counted towards that
// Is no-op if not in safe mode.
// In the case that the block just became complete above, completeBlock()
// handles the safe block count maintenance.
namesystem.incrementSafeBlockCount(numCurrentReplica);
}
// if file is under construction, then done for now
if (bc instanceof MutableBlockCollection) {
return storedBlock;
}
// do not try to handle over/under-replicated blocks during first safe mode
if (!namesystem.isPopulatingReplQueues()) {
return storedBlock;
}
// handle underReplication/overReplication
short fileReplication = bc.getBlockReplication();
if (!isNeededReplication(storedBlock, fileReplication, numCurrentReplica)) {
neededReplications.remove(storedBlock, numCurrentReplica,
num.decommissionedReplicas(), fileReplication);
} else {
updateNeededReplications(storedBlock, curReplicaDelta, 0);
}
if (numCurrentReplica > fileReplication) {
processOverReplicatedBlock(storedBlock, fileReplication, node, delNodeHint);
}
// If the file replication has reached desired value
// we can remove any corrupt replicas the block may have
int corruptReplicasCount = corruptReplicas.numCorruptReplicas(storedBlock);
int numCorruptNodes = num.corruptReplicas();
if (numCorruptNodes != corruptReplicasCount) {
LOG.warn("Inconsistent number of corrupt replicas for " +
storedBlock + "blockMap has " + numCorruptNodes +
" but corrupt replicas map has " + corruptReplicasCount);
}
if ((corruptReplicasCount > 0) && (numLiveReplicas >= fileReplication))
invalidateCorruptReplicas(storedBlock);
return storedBlock;
}
private void logAddStoredBlock(BlockInfo storedBlock, DatanodeDescriptor node) {
if (!blockLog.isInfoEnabled()) {
return;
}
StringBuilder sb = new StringBuilder(500);
sb.append("BLOCK* addStoredBlock: blockMap updated: ")
.append(node)
.append(" is added to ");
storedBlock.appendStringTo(sb);
sb.append(" size " )
.append(storedBlock.getNumBytes());
blockLog.info(sb);
}
/**
* Invalidate corrupt replicas.
* <p>
* This will remove the replicas from the block's location list,
* add them to {@link #invalidateBlocks} so that they could be further
* deleted from the respective data-nodes,
* and remove the block from corruptReplicasMap.
* <p>
* This method should be called when the block has sufficient
* number of live replicas.
*
* @param blk Block whose corrupt replicas need to be invalidated
*/
private void invalidateCorruptReplicas(BlockInfo blk) {
Collection<DatanodeDescriptor> nodes = corruptReplicas.getNodes(blk);
boolean removedFromBlocksMap = true;
if (nodes == null)
return;
// make a copy of the array of nodes in order to avoid
// ConcurrentModificationException, when the block is removed from the node
DatanodeDescriptor[] nodesCopy = nodes.toArray(new DatanodeDescriptor[0]);
for (DatanodeDescriptor node : nodesCopy) {
try {
if (!invalidateBlock(new BlockToMarkCorrupt(blk, null), node)) {
removedFromBlocksMap = false;
}
} catch (IOException e) {
blockLog.info("invalidateCorruptReplicas "
+ "error in deleting bad block " + blk + " on " + node, e);
removedFromBlocksMap = false;
}
}
// Remove the block from corruptReplicasMap
if (removedFromBlocksMap) {
corruptReplicas.removeFromCorruptReplicasMap(blk);
}
}
/**
* For each block in the name-node verify whether it belongs to any file,
* over or under replicated. Place it into the respective queue.
*/
public void processMisReplicatedBlocks() {
assert namesystem.hasWriteLock();
long nrInvalid = 0, nrOverReplicated = 0, nrUnderReplicated = 0, nrPostponed = 0,
nrUnderConstruction = 0;
neededReplications.clear();
for (BlockInfo block : blocksMap.getBlocks()) {
MisReplicationResult res = processMisReplicatedBlock(block);
if (LOG.isTraceEnabled()) {
LOG.trace("block " + block + ": " + res);
}
switch (res) {
case UNDER_REPLICATED:
nrUnderReplicated++;
break;
case OVER_REPLICATED:
nrOverReplicated++;
break;
case INVALID:
nrInvalid++;
break;
case POSTPONE:
nrPostponed++;
postponeBlock(block);
break;
case UNDER_CONSTRUCTION:
nrUnderConstruction++;
break;
case OK:
break;
default:
throw new AssertionError("Invalid enum value: " + res);
}
}
LOG.info("Total number of blocks = " + blocksMap.size());
LOG.info("Number of invalid blocks = " + nrInvalid);
LOG.info("Number of under-replicated blocks = " + nrUnderReplicated);
LOG.info("Number of over-replicated blocks = " + nrOverReplicated +
((nrPostponed > 0) ? ( " (" + nrPostponed + " postponed)") : ""));
LOG.info("Number of blocks being written = " + nrUnderConstruction);
}
/**
* Process a single possibly misreplicated block. This adds it to the
* appropriate queues if necessary, and returns a result code indicating
* what happened with it.
*/
private MisReplicationResult processMisReplicatedBlock(BlockInfo block) {
BlockCollection bc = block.getBlockCollection();
if (bc == null) {
// block does not belong to any file
addToInvalidates(block);
return MisReplicationResult.INVALID;
}
if (!block.isComplete()) {
// Incomplete blocks are never considered mis-replicated --
// they'll be reached when they are completed or recovered.
return MisReplicationResult.UNDER_CONSTRUCTION;
}
// calculate current replication
short expectedReplication = bc.getBlockReplication();
NumberReplicas num = countNodes(block);
int numCurrentReplica = num.liveReplicas();
// add to under-replicated queue if need to be
if (isNeededReplication(block, expectedReplication, numCurrentReplica)) {
if (neededReplications.add(block, numCurrentReplica, num
.decommissionedReplicas(), expectedReplication)) {
return MisReplicationResult.UNDER_REPLICATED;
}
}
if (numCurrentReplica > expectedReplication) {
if (num.replicasOnStaleNodes() > 0) {
// If any of the replicas of this block are on nodes that are
// considered "stale", then these replicas may in fact have
// already been deleted. So, we cannot safely act on the
// over-replication until a later point in time, when
// the "stale" nodes have block reported.
return MisReplicationResult.POSTPONE;
}
// over-replicated block
processOverReplicatedBlock(block, expectedReplication, null, null);
return MisReplicationResult.OVER_REPLICATED;
}
return MisReplicationResult.OK;
}
/** Set replication for the blocks. */
public void setReplication(final short oldRepl, final short newRepl,
final String src, final Block... blocks) {
if (newRepl == oldRepl) {
return;
}
// update needReplication priority queues
for(Block b : blocks) {
updateNeededReplications(b, 0, newRepl-oldRepl);
}
if (oldRepl > newRepl) {
// old replication > the new one; need to remove copies
LOG.info("Decreasing replication from " + oldRepl + " to " + newRepl
+ " for " + src);
for(Block b : blocks) {
processOverReplicatedBlock(b, newRepl, null, null);
}
} else { // replication factor is increased
LOG.info("Increasing replication from " + oldRepl + " to " + newRepl
+ " for " + src);
}
}
/**
* Find how many of the containing nodes are "extra", if any.
* If there are any extras, call chooseExcessReplicates() to
* mark them in the excessReplicateMap.
*/
private void processOverReplicatedBlock(final Block block,
final short replication, final DatanodeDescriptor addedNode,
DatanodeDescriptor delNodeHint) {
assert namesystem.hasWriteLock();
if (addedNode == delNodeHint) {
delNodeHint = null;
}
Collection<DatanodeDescriptor> nonExcess = new ArrayList<DatanodeDescriptor>();
Collection<DatanodeDescriptor> corruptNodes = corruptReplicas
.getNodes(block);
for (Iterator<DatanodeDescriptor> it = blocksMap.nodeIterator(block);
it.hasNext();) {
DatanodeDescriptor cur = it.next();
if (cur.areBlockContentsStale()) {
LOG.info("BLOCK* processOverReplicatedBlock: " +
"Postponing processing of over-replicated " +
block + " since datanode " + cur + " does not yet have up-to-date " +
"block information.");
postponeBlock(block);
return;
}
LightWeightLinkedSet<Block> excessBlocks = excessReplicateMap.get(cur
.getStorageID());
if (excessBlocks == null || !excessBlocks.contains(block)) {
if (!cur.isDecommissionInProgress() && !cur.isDecommissioned()) {
// exclude corrupt replicas
if (corruptNodes == null || !corruptNodes.contains(cur)) {
nonExcess.add(cur);
}
}
}
}
chooseExcessReplicates(nonExcess, block, replication,
addedNode, delNodeHint, blockplacement);
}
/**
* We want "replication" replicates for the block, but we now have too many.
* In this method, copy enough nodes from 'srcNodes' into 'dstNodes' such that:
*
* srcNodes.size() - dstNodes.size() == replication
*
* We pick node that make sure that replicas are spread across racks and
* also try hard to pick one with least free space.
* The algorithm is first to pick a node with least free space from nodes
* that are on a rack holding more than one replicas of the block.
* So removing such a replica won't remove a rack.
* If no such a node is available,
* then pick a node with least free space
*/
private void chooseExcessReplicates(Collection<DatanodeDescriptor> nonExcess,
Block b, short replication,
DatanodeDescriptor addedNode,
DatanodeDescriptor delNodeHint,
BlockPlacementPolicy replicator) {
assert namesystem.hasWriteLock();
// first form a rack to datanodes map and
BlockCollection bc = getBlockCollection(b);
final Map<String, List<DatanodeDescriptor>> rackMap
= new HashMap<String, List<DatanodeDescriptor>>();
final List<DatanodeDescriptor> moreThanOne = new ArrayList<DatanodeDescriptor>();
final List<DatanodeDescriptor> exactlyOne = new ArrayList<DatanodeDescriptor>();
// split nodes into two sets
// moreThanOne contains nodes on rack with more than one replica
// exactlyOne contains the remaining nodes
replicator.splitNodesWithRack(nonExcess, rackMap, moreThanOne,
exactlyOne);
// pick one node to delete that favors the delete hint
// otherwise pick one with least space from priSet if it is not empty
// otherwise one node with least space from remains
boolean firstOne = true;
while (nonExcess.size() - replication > 0) {
// check if we can delete delNodeHint
final DatanodeInfo cur;
if (firstOne && delNodeHint !=null && nonExcess.contains(delNodeHint)
&& (moreThanOne.contains(delNodeHint)
|| (addedNode != null && !moreThanOne.contains(addedNode))) ) {
cur = delNodeHint;
} else { // regular excessive replica removal
cur = replicator.chooseReplicaToDelete(bc, b, replication,
moreThanOne, exactlyOne);
}
firstOne = false;
// adjust rackmap, moreThanOne, and exactlyOne
replicator.adjustSetsWithChosenReplica(rackMap, moreThanOne,
exactlyOne, cur);
nonExcess.remove(cur);
addToExcessReplicate(cur, b);
//
// The 'excessblocks' tracks blocks until we get confirmation
// that the datanode has deleted them; the only way we remove them
// is when we get a "removeBlock" message.
//
// The 'invalidate' list is used to inform the datanode the block
// should be deleted. Items are removed from the invalidate list
// upon giving instructions to the namenode.
//
addToInvalidates(b, cur);
blockLog.info("BLOCK* chooseExcessReplicates: "
+"("+cur+", "+b+") is added to invalidated blocks set");
}
}
private void addToExcessReplicate(DatanodeInfo dn, Block block) {
assert namesystem.hasWriteLock();
LightWeightLinkedSet<Block> excessBlocks = excessReplicateMap.get(dn.getStorageID());
if (excessBlocks == null) {
excessBlocks = new LightWeightLinkedSet<Block>();
excessReplicateMap.put(dn.getStorageID(), excessBlocks);
}
if (excessBlocks.add(block)) {
excessBlocksCount.incrementAndGet();
if(blockLog.isDebugEnabled()) {
blockLog.debug("BLOCK* addToExcessReplicate:"
+ " (" + dn + ", " + block
+ ") is added to excessReplicateMap");
}
}
}
/**
* Modify (block-->datanode) map. Possibly generate replication tasks, if the
* removed block is still valid.
*/
public void removeStoredBlock(Block block, DatanodeDescriptor node) {
if(blockLog.isDebugEnabled()) {
blockLog.debug("BLOCK* removeStoredBlock: "
+ block + " from " + node);
}
assert (namesystem.hasWriteLock());
{
if (!blocksMap.removeNode(block, node)) {
if(blockLog.isDebugEnabled()) {
blockLog.debug("BLOCK* removeStoredBlock: "
+ block + " has already been removed from node " + node);
}
return;
}
//
// It's possible that the block was removed because of a datanode
// failure. If the block is still valid, check if replication is
// necessary. In that case, put block on a possibly-will-
// be-replicated list.
//
BlockCollection bc = blocksMap.getBlockCollection(block);
if (bc != null) {
namesystem.decrementSafeBlockCount(block);
updateNeededReplications(block, -1, 0);
}
//
// We've removed a block from a node, so it's definitely no longer
// in "excess" there.
//
LightWeightLinkedSet<Block> excessBlocks = excessReplicateMap.get(node
.getStorageID());
if (excessBlocks != null) {
if (excessBlocks.remove(block)) {
excessBlocksCount.decrementAndGet();
if(blockLog.isDebugEnabled()) {
blockLog.debug("BLOCK* removeStoredBlock: "
+ block + " is removed from excessBlocks");
}
if (excessBlocks.size() == 0) {
excessReplicateMap.remove(node.getStorageID());
}
}
}
// Remove the replica from corruptReplicas
corruptReplicas.removeFromCorruptReplicasMap(block, node);
}
}
/**
* Get all valid locations of the block & add the block to results
* return the length of the added block; 0 if the block is not added
*/
private long addBlock(Block block, List<BlockWithLocations> results) {
final List<String> machineSet = getValidLocations(block);
if(machineSet.size() == 0) {
return 0;
} else {
results.add(new BlockWithLocations(block,
machineSet.toArray(new String[machineSet.size()])));
return block.getNumBytes();
}
}
/**
* The given node is reporting that it received a certain block.
*/
@VisibleForTesting
void addBlock(DatanodeDescriptor node, Block block, String delHint)
throws IOException {
// decrement number of blocks scheduled to this datanode.
// for a retry request (of DatanodeProtocol#blockReceivedAndDeleted with
// RECEIVED_BLOCK), we currently also decrease the approximate number.
node.decBlocksScheduled();
// get the deletion hint node
DatanodeDescriptor delHintNode = null;
if (delHint != null && delHint.length() != 0) {
delHintNode = datanodeManager.getDatanode(delHint);
if (delHintNode == null) {
blockLog.warn("BLOCK* blockReceived: " + block
+ " is expected to be removed from an unrecorded node " + delHint);
}
}
//
// Modify the blocks->datanode map and node's map.
//
pendingReplications.decrement(block, node);
processAndHandleReportedBlock(node, block, ReplicaState.FINALIZED,
delHintNode);
}
private void processAndHandleReportedBlock(DatanodeDescriptor node, Block block,
ReplicaState reportedState, DatanodeDescriptor delHintNode)
throws IOException {
// blockReceived reports a finalized block
Collection<BlockInfo> toAdd = new LinkedList<BlockInfo>();
Collection<Block> toInvalidate = new LinkedList<Block>();
Collection<BlockToMarkCorrupt> toCorrupt = new LinkedList<BlockToMarkCorrupt>();
Collection<StatefulBlockInfo> toUC = new LinkedList<StatefulBlockInfo>();
processReportedBlock(node, block, reportedState,
toAdd, toInvalidate, toCorrupt, toUC);
// the block is only in one of the to-do lists
// if it is in none then data-node already has it
assert toUC.size() + toAdd.size() + toInvalidate.size() + toCorrupt.size() <= 1
: "The block should be only in one of the lists.";
for (StatefulBlockInfo b : toUC) {
addStoredBlockUnderConstruction(b.storedBlock, node, b.reportedState);
}
for (BlockInfo b : toAdd) {
addStoredBlock(b, node, delHintNode, true);
}
for (Block b : toInvalidate) {
blockLog.info("BLOCK* addBlock: block "
+ b + " on " + node + " size " + b.getNumBytes()
+ " does not belong to any file");
addToInvalidates(b, node);
}
for (BlockToMarkCorrupt b : toCorrupt) {
markBlockAsCorrupt(b, node);
}
}
/**
* The given node is reporting incremental information about some blocks.
* This includes blocks that are starting to be received, completed being
* received, or deleted.
*
* This method must be called with FSNamesystem lock held.
*/
public void processIncrementalBlockReport(final DatanodeID nodeID,
final String poolId, final ReceivedDeletedBlockInfo blockInfos[])
throws IOException {
assert namesystem.hasWriteLock();
int received = 0;
int deleted = 0;
int receiving = 0;
final DatanodeDescriptor node = datanodeManager.getDatanode(nodeID);
if (node == null || !node.isAlive) {
blockLog
.warn("BLOCK* processIncrementalBlockReport"
+ " is received from dead or unregistered node "
+ nodeID);
throw new IOException(
"Got incremental block report from unregistered or dead node");
}
for (ReceivedDeletedBlockInfo rdbi : blockInfos) {
switch (rdbi.getStatus()) {
case DELETED_BLOCK:
removeStoredBlock(rdbi.getBlock(), node);
deleted++;
break;
case RECEIVED_BLOCK:
addBlock(node, rdbi.getBlock(), rdbi.getDelHints());
received++;
break;
case RECEIVING_BLOCK:
receiving++;
processAndHandleReportedBlock(node, rdbi.getBlock(),
ReplicaState.RBW, null);
break;
default:
String msg =
"Unknown block status code reported by " + nodeID +
": " + rdbi;
blockLog.warn(msg);
assert false : msg; // if assertions are enabled, throw.
break;
}
if (blockLog.isDebugEnabled()) {
blockLog.debug("BLOCK* block "
+ (rdbi.getStatus()) + ": " + rdbi.getBlock()
+ " is received from " + nodeID);
}
}
blockLog.debug("*BLOCK* NameNode.processIncrementalBlockReport: " + "from "
+ nodeID + " receiving: " + receiving + ", " + " received: " + received
+ ", " + " deleted: " + deleted);
}
/**
* Return the number of nodes hosting a given block, grouped
* by the state of those replicas.
*/
public NumberReplicas countNodes(Block b) {
int decommissioned = 0;
int live = 0;
int corrupt = 0;
int excess = 0;
int stale = 0;
Iterator<DatanodeDescriptor> nodeIter = blocksMap.nodeIterator(b);
Collection<DatanodeDescriptor> nodesCorrupt = corruptReplicas.getNodes(b);
while (nodeIter.hasNext()) {
DatanodeDescriptor node = nodeIter.next();
if ((nodesCorrupt != null) && (nodesCorrupt.contains(node))) {
corrupt++;
} else if (node.isDecommissionInProgress() || node.isDecommissioned()) {
decommissioned++;
} else {
LightWeightLinkedSet<Block> blocksExcess = excessReplicateMap.get(node
.getStorageID());
if (blocksExcess != null && blocksExcess.contains(b)) {
excess++;
} else {
live++;
}
}
if (node.areBlockContentsStale()) {
stale++;
}
}
return new NumberReplicas(live, decommissioned, corrupt, excess, stale);
}
/**
* Simpler, faster form of {@link #countNodes(Block)} that only returns the number
* of live nodes. If in startup safemode (or its 30-sec extension period),
* then it gains speed by ignoring issues of excess replicas or nodes
* that are decommissioned or in process of becoming decommissioned.
* If not in startup, then it calls {@link #countNodes(Block)} instead.
*
* @param b - the block being tested
* @return count of live nodes for this block
*/
int countLiveNodes(BlockInfo b) {
if (!namesystem.isInStartupSafeMode()) {
return countNodes(b).liveReplicas();
}
// else proceed with fast case
int live = 0;
Iterator<DatanodeDescriptor> nodeIter = blocksMap.nodeIterator(b);
Collection<DatanodeDescriptor> nodesCorrupt = corruptReplicas.getNodes(b);
while (nodeIter.hasNext()) {
DatanodeDescriptor node = nodeIter.next();
if ((nodesCorrupt == null) || (!nodesCorrupt.contains(node)))
live++;
}
return live;
}
private void logBlockReplicationInfo(Block block, DatanodeDescriptor srcNode,
NumberReplicas num) {
int curReplicas = num.liveReplicas();
int curExpectedReplicas = getReplication(block);
BlockCollection bc = blocksMap.getBlockCollection(block);
Iterator<DatanodeDescriptor> nodeIter = blocksMap.nodeIterator(block);
StringBuilder nodeList = new StringBuilder();
while (nodeIter.hasNext()) {
DatanodeDescriptor node = nodeIter.next();
nodeList.append(node);
nodeList.append(" ");
}
LOG.info("Block: " + block + ", Expected Replicas: "
+ curExpectedReplicas + ", live replicas: " + curReplicas
+ ", corrupt replicas: " + num.corruptReplicas()
+ ", decommissioned replicas: " + num.decommissionedReplicas()
+ ", excess replicas: " + num.excessReplicas()
+ ", Is Open File: " + (bc instanceof MutableBlockCollection)
+ ", Datanodes having this block: " + nodeList + ", Current Datanode: "
+ srcNode + ", Is current datanode decommissioning: "
+ srcNode.isDecommissionInProgress());
}
/**
* On stopping decommission, check if the node has excess replicas.
* If there are any excess replicas, call processOverReplicatedBlock()
*/
void processOverReplicatedBlocksOnReCommission(
final DatanodeDescriptor srcNode) {
final Iterator<? extends Block> it = srcNode.getBlockIterator();
int numOverReplicated = 0;
while(it.hasNext()) {
final Block block = it.next();
BlockCollection bc = blocksMap.getBlockCollection(block);
short expectedReplication = bc.getBlockReplication();
NumberReplicas num = countNodes(block);
int numCurrentReplica = num.liveReplicas();
if (numCurrentReplica > expectedReplication) {
// over-replicated block
processOverReplicatedBlock(block, expectedReplication, null, null);
numOverReplicated++;
}
}
LOG.info("Invalidated " + numOverReplicated + " over-replicated blocks on " +
srcNode + " during recommissioning");
}
/**
* Return true if there are any blocks on this node that have not
* yet reached their replication factor. Otherwise returns false.
*/
boolean isReplicationInProgress(DatanodeDescriptor srcNode) {
boolean status = false;
int underReplicatedBlocks = 0;
int decommissionOnlyReplicas = 0;
int underReplicatedInOpenFiles = 0;
final Iterator<? extends Block> it = srcNode.getBlockIterator();
while(it.hasNext()) {
final Block block = it.next();
BlockCollection bc = blocksMap.getBlockCollection(block);
if (bc != null) {
NumberReplicas num = countNodes(block);
int curReplicas = num.liveReplicas();
int curExpectedReplicas = getReplication(block);
if (isNeededReplication(block, curExpectedReplicas, curReplicas)) {
if (curExpectedReplicas > curReplicas) {
//Log info about one block for this node which needs replication
if (!status) {
status = true;
logBlockReplicationInfo(block, srcNode, num);
}
underReplicatedBlocks++;
if ((curReplicas == 0) && (num.decommissionedReplicas() > 0)) {
decommissionOnlyReplicas++;
}
if (bc instanceof MutableBlockCollection) {
underReplicatedInOpenFiles++;
}
}
if (!neededReplications.contains(block) &&
pendingReplications.getNumReplicas(block) == 0) {
//
// These blocks have been reported from the datanode
// after the startDecommission method has been executed. These
// blocks were in flight when the decommissioning was started.
//
neededReplications.add(block,
curReplicas,
num.decommissionedReplicas(),
curExpectedReplicas);
}
}
}
}
srcNode.decommissioningStatus.set(underReplicatedBlocks,
decommissionOnlyReplicas,
underReplicatedInOpenFiles);
return status;
}
public int getActiveBlockCount() {
return blocksMap.size();
}
public DatanodeDescriptor[] getNodes(BlockInfo block) {
DatanodeDescriptor[] nodes =
new DatanodeDescriptor[block.numNodes()];
Iterator<DatanodeDescriptor> it = blocksMap.nodeIterator(block);
for (int i = 0; it != null && it.hasNext(); i++) {
nodes[i] = it.next();
}
return nodes;
}
public int getTotalBlocks() {
return blocksMap.size();
}
public void removeBlock(Block block) {
assert namesystem.hasWriteLock();
// No need to ACK blocks that are being removed entirely
// from the namespace, since the removal of the associated
// file already removes them from the block map below.
block.setNumBytes(BlockCommand.NO_ACK);
addToInvalidates(block);
corruptReplicas.removeFromCorruptReplicasMap(block);
blocksMap.removeBlock(block);
// Remove the block from pendingReplications and neededReplications
pendingReplications.remove(block);
neededReplications.remove(block, UnderReplicatedBlocks.LEVEL);
if (postponedMisreplicatedBlocks.remove(block)) {
postponedMisreplicatedBlocksCount.decrementAndGet();
}
}
public BlockInfo getStoredBlock(Block block) {
return blocksMap.getStoredBlock(block);
}
/** updates a block in under replication queue */
private void updateNeededReplications(final Block block,
final int curReplicasDelta, int expectedReplicasDelta) {
namesystem.writeLock();
try {
if (!namesystem.isPopulatingReplQueues()) {
return;
}
NumberReplicas repl = countNodes(block);
int curExpectedReplicas = getReplication(block);
if (isNeededReplication(block, curExpectedReplicas, repl.liveReplicas())) {
neededReplications.update(block, repl.liveReplicas(), repl
.decommissionedReplicas(), curExpectedReplicas, curReplicasDelta,
expectedReplicasDelta);
} else {
int oldReplicas = repl.liveReplicas()-curReplicasDelta;
int oldExpectedReplicas = curExpectedReplicas-expectedReplicasDelta;
neededReplications.remove(block, oldReplicas, repl.decommissionedReplicas(),
oldExpectedReplicas);
}
} finally {
namesystem.writeUnlock();
}
}
/**
* Check replication of the blocks in the collection.
* If any block is needed replication, insert it into the replication queue.
* Otherwise, if the block is more than the expected replication factor,
* process it as an over replicated block.
*/
public void checkReplication(BlockCollection bc) {
final short expected = bc.getBlockReplication();
for (Block block : bc.getBlocks()) {
final NumberReplicas n = countNodes(block);
if (isNeededReplication(block, expected, n.liveReplicas())) {
neededReplications.add(block, n.liveReplicas(),
n.decommissionedReplicas(), expected);
} else if (n.liveReplicas() > expected) {
processOverReplicatedBlock(block, expected, null, null);
}
}
}
/**
* @return 0 if the block is not found;
* otherwise, return the replication factor of the block.
*/
private int getReplication(Block block) {
final BlockCollection bc = blocksMap.getBlockCollection(block);
return bc == null? 0: bc.getBlockReplication();
}
/**
* Get blocks to invalidate for <i>nodeId</i>
* in {@link #invalidateBlocks}.
*
* @return number of blocks scheduled for removal during this iteration.
*/
private int invalidateWorkForOneNode(String nodeId) {
namesystem.writeLock();
try {
// blocks should not be replicated or removed if safe mode is on
if (namesystem.isInSafeMode()) {
LOG.debug("In safemode, not computing replication work");
return 0;
}
// get blocks to invalidate for the nodeId
assert nodeId != null;
return invalidateBlocks.invalidateWork(nodeId);
} finally {
namesystem.writeUnlock();
}
}
boolean blockHasEnoughRacks(Block b) {
if (!this.shouldCheckForEnoughRacks) {
return true;
}
boolean enoughRacks = false;;
Collection<DatanodeDescriptor> corruptNodes =
corruptReplicas.getNodes(b);
int numExpectedReplicas = getReplication(b);
String rackName = null;
for (Iterator<DatanodeDescriptor> it = blocksMap.nodeIterator(b);
it.hasNext();) {
DatanodeDescriptor cur = it.next();
if (!cur.isDecommissionInProgress() && !cur.isDecommissioned()) {
if ((corruptNodes == null ) || !corruptNodes.contains(cur)) {
if (numExpectedReplicas == 1 ||
(numExpectedReplicas > 1 &&
!datanodeManager.hasClusterEverBeenMultiRack())) {
enoughRacks = true;
break;
}
String rackNameNew = cur.getNetworkLocation();
if (rackName == null) {
rackName = rackNameNew;
} else if (!rackName.equals(rackNameNew)) {
enoughRacks = true;
break;
}
}
}
}
return enoughRacks;
}
/**
* A block needs replication if the number of replicas is less than expected
* or if it does not have enough racks.
*/
private boolean isNeededReplication(Block b, int expected, int current) {
return current < expected || !blockHasEnoughRacks(b);
}
public long getMissingBlocksCount() {
// not locking
return this.neededReplications.getCorruptBlockSize();
}
public BlockInfo addBlockCollection(BlockInfo block, BlockCollection bc) {
return blocksMap.addBlockCollection(block, bc);
}
public BlockCollection getBlockCollection(Block b) {
return blocksMap.getBlockCollection(b);
}
/** @return an iterator of the datanodes. */
public Iterator<DatanodeDescriptor> datanodeIterator(final Block block) {
return blocksMap.nodeIterator(block);
}
public int numCorruptReplicas(Block block) {
return corruptReplicas.numCorruptReplicas(block);
}
public void removeBlockFromMap(Block block) {
blocksMap.removeBlock(block);
// If block is removed from blocksMap remove it from corruptReplicasMap
corruptReplicas.removeFromCorruptReplicasMap(block);
}
public int getCapacity() {
namesystem.readLock();
try {
return blocksMap.getCapacity();
} finally {
namesystem.readUnlock();
}
}
/**
* Return a range of corrupt replica block ids. Up to numExpectedBlocks
* blocks starting at the next block after startingBlockId are returned
* (fewer if numExpectedBlocks blocks are unavailable). If startingBlockId
* is null, up to numExpectedBlocks blocks are returned from the beginning.
* If startingBlockId cannot be found, null is returned.
*
* @param numExpectedBlocks Number of block ids to return.
* 0 <= numExpectedBlocks <= 100
* @param startingBlockId Block id from which to start. If null, start at
* beginning.
* @return Up to numExpectedBlocks blocks from startingBlockId if it exists
*
*/
public long[] getCorruptReplicaBlockIds(int numExpectedBlocks,
Long startingBlockId) {
return corruptReplicas.getCorruptReplicaBlockIds(numExpectedBlocks,
startingBlockId);
}
/**
* Return an iterator over the set of blocks for which there are no replicas.
*/
public Iterator<Block> getCorruptReplicaBlockIterator() {
return neededReplications.iterator(
UnderReplicatedBlocks.QUEUE_WITH_CORRUPT_BLOCKS);
}
/** @return the size of UnderReplicatedBlocks */
public int numOfUnderReplicatedBlocks() {
return neededReplications.size();
}
/**
* Periodically calls computeReplicationWork().
*/
private class ReplicationMonitor implements Runnable {
@Override
public void run() {
while (namesystem.isRunning()) {
try {
computeDatanodeWork();
processPendingReplications();
Thread.sleep(replicationRecheckInterval);
} catch (Throwable t) {
if (!namesystem.isRunning()) {
LOG.info("Stopping ReplicationMonitor.");
if (!(t instanceof InterruptedException)) {
LOG.info("ReplicationMonitor received an exception"
+ " while shutting down.", t);
}
break;
} else if (!checkNSRunning && t instanceof InterruptedException) {
LOG.info("Stopping ReplicationMonitor for testing.");
break;
}
LOG.fatal("ReplicationMonitor thread received Runtime exception. ", t);
terminate(1, t);
}
}
}
}
/**
* Compute block replication and block invalidation work that can be scheduled
* on data-nodes. The datanode will be informed of this work at the next
* heartbeat.
*
* @return number of blocks scheduled for replication or removal.
* @throws IOException
*/
int computeDatanodeWork() {
// Blocks should not be replicated or removed if in safe mode.
// It's OK to check safe mode here w/o holding lock, in the worst
// case extra replications will be scheduled, and these will get
// fixed up later.
if (namesystem.isInSafeMode()) {
return 0;
}
final int numlive = heartbeatManager.getLiveDatanodeCount();
final int blocksToProcess = numlive
* this.blocksReplWorkMultiplier;
final int nodesToProcess = (int) Math.ceil(numlive
* this.blocksInvalidateWorkPct);
int workFound = this.computeReplicationWork(blocksToProcess);
// Update counters
namesystem.writeLock();
try {
this.updateState();
this.scheduledReplicationBlocksCount = workFound;
} finally {
namesystem.writeUnlock();
}
workFound += this.computeInvalidateWork(nodesToProcess);
return workFound;
}
/**
* Clear all queues that hold decisions previously made by
* this NameNode.
*/
public void clearQueues() {
neededReplications.clear();
pendingReplications.clear();
excessReplicateMap.clear();
invalidateBlocks.clear();
datanodeManager.clearPendingQueues();
};
private static class ReplicationWork {
private Block block;
private BlockCollection bc;
private DatanodeDescriptor srcNode;
private List<DatanodeDescriptor> containingNodes;
private List<DatanodeDescriptor> liveReplicaNodes;
private int additionalReplRequired;
private DatanodeDescriptor targets[];
private int priority;
public ReplicationWork(Block block,
BlockCollection bc,
DatanodeDescriptor srcNode,
List<DatanodeDescriptor> containingNodes,
List<DatanodeDescriptor> liveReplicaNodes,
int additionalReplRequired,
int priority) {
this.block = block;
this.bc = bc;
this.srcNode = srcNode;
this.containingNodes = containingNodes;
this.liveReplicaNodes = liveReplicaNodes;
this.additionalReplRequired = additionalReplRequired;
this.priority = priority;
this.targets = null;
}
}
/**
* A simple result enum for the result of
* {@link BlockManager#processMisReplicatedBlock(BlockInfo)}.
*/
enum MisReplicationResult {
/** The block should be invalidated since it belongs to a deleted file. */
INVALID,
/** The block is currently under-replicated. */
UNDER_REPLICATED,
/** The block is currently over-replicated. */
OVER_REPLICATED,
/** A decision can't currently be made about this block. */
POSTPONE,
/** The block is under construction, so should be ignored */
UNDER_CONSTRUCTION,
/** The block is properly replicated */
OK
}
public void shutdown() {
blocksMap.close();
}
}