/**
* 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.datanode;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import javax.management.NotCompliantMBeanException;
import javax.management.ObjectName;
import javax.management.StandardMBean;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.StorageType;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.BlockListAsLongs;
import org.apache.hadoop.hdfs.protocol.BlockLocalPathInfo;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.protocol.HdfsBlocksMetadata;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.ReplicaState;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsDatasetSpi;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.LengthInputStream;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.ReplicaInputStreams;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.ReplicaOutputStreams;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.RollingLogs;
import org.apache.hadoop.hdfs.server.datanode.metrics.FSDatasetMBean;
import org.apache.hadoop.hdfs.server.protocol.BlockRecoveryCommand.RecoveringBlock;
import org.apache.hadoop.hdfs.server.protocol.DatanodeStorage;
import org.apache.hadoop.hdfs.server.protocol.ReplicaRecoveryInfo;
import org.apache.hadoop.hdfs.server.protocol.StorageReport;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.metrics2.util.MBeans;
import org.apache.hadoop.util.DataChecksum;
import org.apache.hadoop.util.DiskChecker.DiskErrorException;
/**
* This class implements a simulated FSDataset.
*
* Blocks that are created are recorded but their data (plus their CRCs) are
* discarded.
* Fixed data is returned when blocks are read; a null CRC meta file is
* created for such data.
*
* This FSDataset does not remember any block information across its
* restarts; it does however offer an operation to inject blocks
* (See the TestInectionForSImulatedStorage()
* for a usage example of injection.
*
* Note the synchronization is coarse grained - it is at each method.
*/
public class SimulatedFSDataset implements FsDatasetSpi<FsVolumeSpi> {
static class Factory extends FsDatasetSpi.Factory<SimulatedFSDataset> {
@Override
public SimulatedFSDataset newInstance(DataNode datanode,
DataStorage storage, Configuration conf) throws IOException {
return new SimulatedFSDataset(storage, conf);
}
@Override
public boolean isSimulated() {
return true;
}
}
public static void setFactory(Configuration conf) {
conf.set(DFSConfigKeys.DFS_DATANODE_FSDATASET_FACTORY_KEY,
Factory.class.getName());
}
public static final String CONFIG_PROPERTY_CAPACITY =
"dfs.datanode.simulateddatastorage.capacity";
public static final long DEFAULT_CAPACITY = 2L<<40; // 1 terabyte
public static final byte DEFAULT_DATABYTE = 9;
public static final String CONFIG_PROPERTY_STATE =
"dfs.datanode.simulateddatastorage.state";
private static final DatanodeStorage.State DEFAULT_STATE =
DatanodeStorage.State.NORMAL;
static final byte[] nullCrcFileData;
static {
DataChecksum checksum = DataChecksum.newDataChecksum(
DataChecksum.Type.NULL, 16*1024 );
byte[] nullCrcHeader = checksum.getHeader();
nullCrcFileData = new byte[2 + nullCrcHeader.length];
nullCrcFileData[0] = (byte) ((BlockMetadataHeader.VERSION >>> 8) & 0xff);
nullCrcFileData[1] = (byte) (BlockMetadataHeader.VERSION & 0xff);
for (int i = 0; i < nullCrcHeader.length; i++) {
nullCrcFileData[i+2] = nullCrcHeader[i];
}
}
// information about a single block
private class BInfo implements ReplicaInPipelineInterface {
final Block theBlock;
private boolean finalized = false; // if not finalized => ongoing creation
SimulatedOutputStream oStream = null;
private long bytesAcked;
private long bytesRcvd;
BInfo(String bpid, Block b, boolean forWriting) throws IOException {
theBlock = new Block(b);
if (theBlock.getNumBytes() < 0) {
theBlock.setNumBytes(0);
}
if (!storage.alloc(bpid, theBlock.getNumBytes())) {
// expected length - actual length may
// be more - we find out at finalize
DataNode.LOG.warn("Lack of free storage on a block alloc");
throw new IOException("Creating block, no free space available");
}
if (forWriting) {
finalized = false;
oStream = new SimulatedOutputStream();
} else {
finalized = true;
oStream = null;
}
}
@Override
public String getStorageUuid() {
return storage.getStorageUuid();
}
@Override
synchronized public long getGenerationStamp() {
return theBlock.getGenerationStamp();
}
@Override
synchronized public long getNumBytes() {
if (!finalized) {
return bytesRcvd;
} else {
return theBlock.getNumBytes();
}
}
@Override
synchronized public void setNumBytes(long length) {
if (!finalized) {
bytesRcvd = length;
} else {
theBlock.setNumBytes(length);
}
}
synchronized SimulatedInputStream getIStream() {
if (!finalized) {
// throw new IOException("Trying to read an unfinalized block");
return new SimulatedInputStream(oStream.getLength(), DEFAULT_DATABYTE);
} else {
return new SimulatedInputStream(theBlock.getNumBytes(), DEFAULT_DATABYTE);
}
}
synchronized void finalizeBlock(String bpid, long finalSize)
throws IOException {
if (finalized) {
throw new IOException(
"Finalizing a block that has already been finalized" +
theBlock.getBlockId());
}
if (oStream == null) {
DataNode.LOG.error("Null oStream on unfinalized block - bug");
throw new IOException("Unexpected error on finalize");
}
if (oStream.getLength() != finalSize) {
DataNode.LOG.warn("Size passed to finalize (" + finalSize +
")does not match what was written:" + oStream.getLength());
throw new IOException(
"Size passed to finalize does not match the amount of data written");
}
// We had allocated the expected length when block was created;
// adjust if necessary
long extraLen = finalSize - theBlock.getNumBytes();
if (extraLen > 0) {
if (!storage.alloc(bpid,extraLen)) {
DataNode.LOG.warn("Lack of free storage on a block alloc");
throw new IOException("Creating block, no free space available");
}
} else {
storage.free(bpid, -extraLen);
}
theBlock.setNumBytes(finalSize);
finalized = true;
oStream = null;
return;
}
synchronized void unfinalizeBlock() throws IOException {
if (!finalized) {
throw new IOException("Unfinalized a block that's not finalized "
+ theBlock);
}
finalized = false;
oStream = new SimulatedOutputStream();
long blockLen = theBlock.getNumBytes();
oStream.setLength(blockLen);
bytesRcvd = blockLen;
bytesAcked = blockLen;
}
SimulatedInputStream getMetaIStream() {
return new SimulatedInputStream(nullCrcFileData);
}
synchronized boolean isFinalized() {
return finalized;
}
@Override
synchronized public ReplicaOutputStreams createStreams(boolean isCreate,
DataChecksum requestedChecksum) throws IOException {
if (finalized) {
throw new IOException("Trying to write to a finalized replica "
+ theBlock);
} else {
SimulatedOutputStream crcStream = new SimulatedOutputStream();
return new ReplicaOutputStreams(oStream, crcStream, requestedChecksum);
}
}
@Override
synchronized public long getBlockId() {
return theBlock.getBlockId();
}
@Override
synchronized public long getVisibleLength() {
return getBytesAcked();
}
@Override
public ReplicaState getState() {
return null;
}
@Override
synchronized public long getBytesAcked() {
if (finalized) {
return theBlock.getNumBytes();
} else {
return bytesAcked;
}
}
@Override
synchronized public void setBytesAcked(long bytesAcked) {
if (!finalized) {
this.bytesAcked = bytesAcked;
}
}
@Override
synchronized public long getBytesOnDisk() {
if (finalized) {
return theBlock.getNumBytes();
} else {
return oStream.getLength();
}
}
@Override
public void setLastChecksumAndDataLen(long dataLength, byte[] lastChecksum) {
oStream.setLength(dataLength);
}
@Override
public ChunkChecksum getLastChecksumAndDataLen() {
return new ChunkChecksum(oStream.getLength(), null);
}
}
/**
* Class is used for tracking block pool storage utilization similar
* to {@link BlockPoolSlice}
*/
private static class SimulatedBPStorage {
private long used; // in bytes
long getUsed() {
return used;
}
void alloc(long amount) {
used += amount;
}
void free(long amount) {
used -= amount;
}
SimulatedBPStorage() {
used = 0;
}
}
/**
* Class used for tracking datanode level storage utilization similar
* to {@link FSVolumeSet}
*/
private static class SimulatedStorage {
private final Map<String, SimulatedBPStorage> map =
new HashMap<String, SimulatedBPStorage>();
private final long capacity; // in bytes
private final DatanodeStorage dnStorage;
synchronized long getFree() {
return capacity - getUsed();
}
long getCapacity() {
return capacity;
}
synchronized long getUsed() {
long used = 0;
for (SimulatedBPStorage bpStorage : map.values()) {
used += bpStorage.getUsed();
}
return used;
}
synchronized long getBlockPoolUsed(String bpid) throws IOException {
return getBPStorage(bpid).getUsed();
}
int getNumFailedVolumes() {
return 0;
}
synchronized boolean alloc(String bpid, long amount) throws IOException {
if (getFree() >= amount) {
getBPStorage(bpid).alloc(amount);
return true;
}
return false;
}
synchronized void free(String bpid, long amount) throws IOException {
getBPStorage(bpid).free(amount);
}
SimulatedStorage(long cap, DatanodeStorage.State state) {
capacity = cap;
dnStorage = new DatanodeStorage(
"SimulatedStorage-" + DatanodeStorage.generateUuid(),
state, StorageType.DEFAULT);
}
synchronized void addBlockPool(String bpid) {
SimulatedBPStorage bpStorage = map.get(bpid);
if (bpStorage != null) {
return;
}
map.put(bpid, new SimulatedBPStorage());
}
synchronized void removeBlockPool(String bpid) {
map.remove(bpid);
}
private SimulatedBPStorage getBPStorage(String bpid) throws IOException {
SimulatedBPStorage bpStorage = map.get(bpid);
if (bpStorage == null) {
throw new IOException("block pool " + bpid + " not found");
}
return bpStorage;
}
String getStorageUuid() {
return dnStorage.getStorageID();
}
DatanodeStorage getDnStorage() {
return dnStorage;
}
synchronized StorageReport getStorageReport(String bpid) {
return new StorageReport(dnStorage,
false, getCapacity(), getUsed(), getFree(),
map.get(bpid).getUsed());
}
}
private final Map<String, Map<Block, BInfo>> blockMap
= new HashMap<String, Map<Block,BInfo>>();
private final SimulatedStorage storage;
private final String datanodeUuid;
public SimulatedFSDataset(DataStorage storage, Configuration conf) {
if (storage != null) {
for (int i = 0; i < storage.getNumStorageDirs(); ++i) {
storage.createStorageID(storage.getStorageDir(i));
}
this.datanodeUuid = storage.getDatanodeUuid();
} else {
this.datanodeUuid = "SimulatedDatanode-" + DataNode.generateUuid();
}
registerMBean(datanodeUuid);
this.storage = new SimulatedStorage(
conf.getLong(CONFIG_PROPERTY_CAPACITY, DEFAULT_CAPACITY),
conf.getEnum(CONFIG_PROPERTY_STATE, DEFAULT_STATE));
}
public synchronized void injectBlocks(String bpid,
Iterable<Block> injectBlocks) throws IOException {
ExtendedBlock blk = new ExtendedBlock();
if (injectBlocks != null) {
for (Block b: injectBlocks) { // if any blocks in list is bad, reject list
if (b == null) {
throw new NullPointerException("Null blocks in block list");
}
blk.set(bpid, b);
if (isValidBlock(blk)) {
throw new IOException("Block already exists in block list");
}
}
Map<Block, BInfo> map = blockMap.get(bpid);
if (map == null) {
map = new HashMap<Block, BInfo>();
blockMap.put(bpid, map);
}
for (Block b: injectBlocks) {
BInfo binfo = new BInfo(bpid, b, false);
map.put(binfo.theBlock, binfo);
}
}
}
/** Get a map for a given block pool Id */
private Map<Block, BInfo> getMap(String bpid) throws IOException {
final Map<Block, BInfo> map = blockMap.get(bpid);
if (map == null) {
throw new IOException("Non existent blockpool " + bpid);
}
return map;
}
@Override // FsDatasetSpi
public synchronized void finalizeBlock(ExtendedBlock b) throws IOException {
final Map<Block, BInfo> map = getMap(b.getBlockPoolId());
BInfo binfo = map.get(b.getLocalBlock());
if (binfo == null) {
throw new IOException("Finalizing a non existing block " + b);
}
binfo.finalizeBlock(b.getBlockPoolId(), b.getNumBytes());
}
@Override // FsDatasetSpi
public synchronized void unfinalizeBlock(ExtendedBlock b) {
if (isValidRbw(b)) {
blockMap.remove(b.getLocalBlock());
}
}
synchronized BlockListAsLongs getBlockReport(String bpid) {
final List<Block> blocks = new ArrayList<Block>();
final Map<Block, BInfo> map = blockMap.get(bpid);
if (map != null) {
for (BInfo b : map.values()) {
if (b.isFinalized()) {
blocks.add(b.theBlock);
}
}
}
return new BlockListAsLongs(blocks, null);
}
@Override
public synchronized Map<DatanodeStorage, BlockListAsLongs> getBlockReports(
String bpid) {
return Collections.singletonMap(storage.getDnStorage(), getBlockReport(bpid));
}
@Override // FsDatasetSpi
public List<Long> getCacheReport(String bpid) {
return new LinkedList<Long>();
}
@Override // FSDatasetMBean
public long getCapacity() {
return storage.getCapacity();
}
@Override // FSDatasetMBean
public long getDfsUsed() {
return storage.getUsed();
}
@Override // FSDatasetMBean
public long getBlockPoolUsed(String bpid) throws IOException {
return storage.getBlockPoolUsed(bpid);
}
@Override // FSDatasetMBean
public long getRemaining() {
return storage.getFree();
}
@Override // FSDatasetMBean
public int getNumFailedVolumes() {
return storage.getNumFailedVolumes();
}
@Override // FSDatasetMBean
public long getCacheUsed() {
return 0l;
}
@Override // FSDatasetMBean
public long getCacheCapacity() {
return 0l;
}
@Override // FSDatasetMBean
public long getNumBlocksCached() {
return 0l;
}
@Override
public long getNumBlocksFailedToCache() {
return 0l;
}
@Override
public long getNumBlocksFailedToUncache() {
return 0l;
}
@Override // FsDatasetSpi
public synchronized long getLength(ExtendedBlock b) throws IOException {
final Map<Block, BInfo> map = getMap(b.getBlockPoolId());
BInfo binfo = map.get(b.getLocalBlock());
if (binfo == null) {
throw new IOException("Finalizing a non existing block " + b);
}
return binfo.getNumBytes();
}
@Override
@Deprecated
public Replica getReplica(String bpid, long blockId) {
final Map<Block, BInfo> map = blockMap.get(bpid);
if (map != null) {
return map.get(new Block(blockId));
}
return null;
}
@Override
public synchronized String getReplicaString(String bpid, long blockId) {
Replica r = null;
final Map<Block, BInfo> map = blockMap.get(bpid);
if (map != null) {
r = map.get(new Block(blockId));
}
return r == null? "null": r.toString();
}
@Override // FsDatasetSpi
public Block getStoredBlock(String bpid, long blkid) throws IOException {
final Map<Block, BInfo> map = blockMap.get(bpid);
if (map != null) {
BInfo binfo = map.get(new Block(blkid));
if (binfo == null) {
return null;
}
return new Block(blkid, binfo.getGenerationStamp(), binfo.getNumBytes());
}
return null;
}
@Override // FsDatasetSpi
public synchronized void invalidate(String bpid, Block[] invalidBlks)
throws IOException {
boolean error = false;
if (invalidBlks == null) {
return;
}
final Map<Block, BInfo> map = getMap(bpid);
for (Block b: invalidBlks) {
if (b == null) {
continue;
}
BInfo binfo = map.get(b);
if (binfo == null) {
error = true;
DataNode.LOG.warn("Invalidate: Missing block");
continue;
}
storage.free(bpid, binfo.getNumBytes());
blockMap.remove(b);
}
if (error) {
throw new IOException("Invalidate: Missing blocks.");
}
}
@Override // FSDatasetSpi
public void cache(String bpid, long[] cacheBlks) {
throw new UnsupportedOperationException(
"SimulatedFSDataset does not support cache operation!");
}
@Override // FSDatasetSpi
public void uncache(String bpid, long[] uncacheBlks) {
throw new UnsupportedOperationException(
"SimulatedFSDataset does not support uncache operation!");
}
@Override // FSDatasetSpi
public boolean isCached(String bpid, long blockId) {
return false;
}
private BInfo getBInfo(final ExtendedBlock b) {
final Map<Block, BInfo> map = blockMap.get(b.getBlockPoolId());
return map == null? null: map.get(b.getLocalBlock());
}
@Override // {@link FsDatasetSpi}
public boolean contains(ExtendedBlock block) {
return getBInfo(block) != null;
}
@Override // FsDatasetSpi
public synchronized boolean isValidBlock(ExtendedBlock b) {
final BInfo binfo = getBInfo(b);
return binfo != null && binfo.isFinalized();
}
/* check if a block is created but not finalized */
@Override
public synchronized boolean isValidRbw(ExtendedBlock b) {
final BInfo binfo = getBInfo(b);
return binfo != null && !binfo.isFinalized();
}
@Override
public String toString() {
return getStorageInfo();
}
@Override // FsDatasetSpi
public synchronized ReplicaInPipelineInterface append(ExtendedBlock b,
long newGS, long expectedBlockLen) throws IOException {
final Map<Block, BInfo> map = getMap(b.getBlockPoolId());
BInfo binfo = map.get(b.getLocalBlock());
if (binfo == null || !binfo.isFinalized()) {
throw new ReplicaNotFoundException("Block " + b
+ " is not valid, and cannot be appended to.");
}
binfo.unfinalizeBlock();
return binfo;
}
@Override // FsDatasetSpi
public synchronized ReplicaInPipelineInterface recoverAppend(ExtendedBlock b,
long newGS, long expectedBlockLen) throws IOException {
final Map<Block, BInfo> map = getMap(b.getBlockPoolId());
BInfo binfo = map.get(b.getLocalBlock());
if (binfo == null) {
throw new ReplicaNotFoundException("Block " + b
+ " is not valid, and cannot be appended to.");
}
if (binfo.isFinalized()) {
binfo.unfinalizeBlock();
}
map.remove(b);
binfo.theBlock.setGenerationStamp(newGS);
map.put(binfo.theBlock, binfo);
return binfo;
}
@Override // FsDatasetSpi
public String recoverClose(ExtendedBlock b, long newGS, long expectedBlockLen)
throws IOException {
final Map<Block, BInfo> map = getMap(b.getBlockPoolId());
BInfo binfo = map.get(b.getLocalBlock());
if (binfo == null) {
throw new ReplicaNotFoundException("Block " + b
+ " is not valid, and cannot be appended to.");
}
if (!binfo.isFinalized()) {
binfo.finalizeBlock(b.getBlockPoolId(), binfo.getNumBytes());
}
map.remove(b.getLocalBlock());
binfo.theBlock.setGenerationStamp(newGS);
map.put(binfo.theBlock, binfo);
return binfo.getStorageUuid();
}
@Override // FsDatasetSpi
public synchronized ReplicaInPipelineInterface recoverRbw(ExtendedBlock b,
long newGS, long minBytesRcvd, long maxBytesRcvd) throws IOException {
final Map<Block, BInfo> map = getMap(b.getBlockPoolId());
BInfo binfo = map.get(b.getLocalBlock());
if ( binfo == null) {
throw new ReplicaNotFoundException("Block " + b
+ " does not exist, and cannot be appended to.");
}
if (binfo.isFinalized()) {
throw new ReplicaAlreadyExistsException("Block " + b
+ " is valid, and cannot be written to.");
}
map.remove(b);
binfo.theBlock.setGenerationStamp(newGS);
map.put(binfo.theBlock, binfo);
return binfo;
}
@Override // FsDatasetSpi
public synchronized ReplicaInPipelineInterface createRbw(ExtendedBlock b)
throws IOException {
return createTemporary(b);
}
@Override // FsDatasetSpi
public synchronized ReplicaInPipelineInterface createTemporary(ExtendedBlock b)
throws IOException {
if (isValidBlock(b)) {
throw new ReplicaAlreadyExistsException("Block " + b +
" is valid, and cannot be written to.");
}
if (isValidRbw(b)) {
throw new ReplicaAlreadyExistsException("Block " + b +
" is being written, and cannot be written to.");
}
final Map<Block, BInfo> map = getMap(b.getBlockPoolId());
BInfo binfo = new BInfo(b.getBlockPoolId(), b.getLocalBlock(), true);
map.put(binfo.theBlock, binfo);
return binfo;
}
synchronized InputStream getBlockInputStream(ExtendedBlock b
) throws IOException {
final Map<Block, BInfo> map = getMap(b.getBlockPoolId());
BInfo binfo = map.get(b.getLocalBlock());
if (binfo == null) {
throw new IOException("No such Block " + b );
}
return binfo.getIStream();
}
@Override // FsDatasetSpi
public synchronized InputStream getBlockInputStream(ExtendedBlock b,
long seekOffset) throws IOException {
InputStream result = getBlockInputStream(b);
IOUtils.skipFully(result, seekOffset);
return result;
}
/** Not supported */
@Override // FsDatasetSpi
public ReplicaInputStreams getTmpInputStreams(ExtendedBlock b, long blkoff,
long ckoff) throws IOException {
throw new IOException("Not supported");
}
@Override // FsDatasetSpi
public synchronized LengthInputStream getMetaDataInputStream(ExtendedBlock b
) throws IOException {
final Map<Block, BInfo> map = getMap(b.getBlockPoolId());
BInfo binfo = map.get(b.getLocalBlock());
if (binfo == null) {
throw new IOException("No such Block " + b );
}
if (!binfo.finalized) {
throw new IOException("Block " + b +
" is being written, its meta cannot be read");
}
final SimulatedInputStream sin = binfo.getMetaIStream();
return new LengthInputStream(sin, sin.getLength());
}
@Override
public void checkDataDir() throws DiskErrorException {
// nothing to check for simulated data set
}
@Override // FsDatasetSpi
public synchronized void adjustCrcChannelPosition(ExtendedBlock b,
ReplicaOutputStreams stream,
int checksumSize)
throws IOException {
}
/**
* Simulated input and output streams
*
*/
static private class SimulatedInputStream extends java.io.InputStream {
byte theRepeatedData = 7;
final long length; // bytes
int currentPos = 0;
byte[] data = null;
/**
* An input stream of size l with repeated bytes
* @param l
* @param iRepeatedData
*/
SimulatedInputStream(long l, byte iRepeatedData) {
length = l;
theRepeatedData = iRepeatedData;
}
/**
* An input stream of of the supplied data
*
* @param iData
*/
SimulatedInputStream(byte[] iData) {
data = iData;
length = data.length;
}
/**
*
* @return the lenght of the input stream
*/
long getLength() {
return length;
}
@Override
public int read() throws IOException {
if (currentPos >= length)
return -1;
if (data !=null) {
return data[currentPos++];
} else {
currentPos++;
return theRepeatedData;
}
}
@Override
public int read(byte[] b) throws IOException {
if (b == null) {
throw new NullPointerException();
}
if (b.length == 0) {
return 0;
}
if (currentPos >= length) { // EOF
return -1;
}
int bytesRead = (int) Math.min(b.length, length-currentPos);
if (data != null) {
System.arraycopy(data, currentPos, b, 0, bytesRead);
} else { // all data is zero
for (int i : b) {
b[i] = theRepeatedData;
}
}
currentPos += bytesRead;
return bytesRead;
}
}
/**
* This class implements an output stream that merely throws its data away, but records its
* length.
*
*/
static private class SimulatedOutputStream extends OutputStream {
long length = 0;
/**
* constructor for Simulated Output Steram
*/
SimulatedOutputStream() {
}
/**
*
* @return the length of the data created so far.
*/
long getLength() {
return length;
}
/**
*/
void setLength(long length) {
this.length = length;
}
@Override
public void write(int arg0) throws IOException {
length++;
}
@Override
public void write(byte[] b) throws IOException {
length += b.length;
}
@Override
public void write(byte[] b,
int off,
int len) throws IOException {
length += len;
}
}
private ObjectName mbeanName;
/**
* Register the FSDataset MBean using the name
* "hadoop:service=DataNode,name=FSDatasetState-<storageid>"
* We use storage id for MBean name since a minicluster within a single
* Java VM may have multiple Simulated Datanodes.
*/
void registerMBean(final String storageId) {
// We wrap to bypass standard mbean naming convetion.
// This wraping can be removed in java 6 as it is more flexible in
// package naming for mbeans and their impl.
StandardMBean bean;
try {
bean = new StandardMBean(this,FSDatasetMBean.class);
mbeanName = MBeans.register("DataNode", "FSDatasetState-"+
storageId, bean);
} catch (NotCompliantMBeanException e) {
DataNode.LOG.warn("Error registering FSDatasetState MBean", e);
}
DataNode.LOG.info("Registered FSDatasetState MBean");
}
@Override
public void shutdown() {
if (mbeanName != null) MBeans.unregister(mbeanName);
}
@Override
public String getStorageInfo() {
return "Simulated FSDataset-" + datanodeUuid;
}
@Override
public boolean hasEnoughResource() {
return true;
}
@Override
public ReplicaRecoveryInfo initReplicaRecovery(RecoveringBlock rBlock)
throws IOException {
ExtendedBlock b = rBlock.getBlock();
final Map<Block, BInfo> map = getMap(b.getBlockPoolId());
BInfo binfo = map.get(b.getLocalBlock());
if (binfo == null) {
throw new IOException("No such Block " + b );
}
return new ReplicaRecoveryInfo(binfo.getBlockId(), binfo.getBytesOnDisk(),
binfo.getGenerationStamp(),
binfo.isFinalized()?ReplicaState.FINALIZED : ReplicaState.RBW);
}
@Override // FsDatasetSpi
public String updateReplicaUnderRecovery(ExtendedBlock oldBlock,
long recoveryId,
long newlength) {
// Caller does not care about the exact Storage UUID returned.
return datanodeUuid;
}
@Override // FsDatasetSpi
public long getReplicaVisibleLength(ExtendedBlock block) {
return block.getNumBytes();
}
@Override // FsDatasetSpi
public void addBlockPool(String bpid, Configuration conf) {
Map<Block, BInfo> map = new HashMap<Block, BInfo>();
blockMap.put(bpid, map);
storage.addBlockPool(bpid);
}
@Override // FsDatasetSpi
public void shutdownBlockPool(String bpid) {
blockMap.remove(bpid);
storage.removeBlockPool(bpid);
}
@Override // FsDatasetSpi
public void deleteBlockPool(String bpid, boolean force) {
return;
}
@Override
public ReplicaInPipelineInterface convertTemporaryToRbw(ExtendedBlock temporary)
throws IOException {
final Map<Block, BInfo> map = blockMap.get(temporary.getBlockPoolId());
if (map == null) {
throw new IOException("Block pool not found, temporary=" + temporary);
}
final BInfo r = map.get(temporary.getLocalBlock());
if (r == null) {
throw new IOException("Block not found, temporary=" + temporary);
} else if (r.isFinalized()) {
throw new IOException("Replica already finalized, temporary="
+ temporary + ", r=" + r);
}
return r;
}
@Override
public BlockLocalPathInfo getBlockLocalPathInfo(ExtendedBlock b) {
throw new UnsupportedOperationException();
}
@Override
public HdfsBlocksMetadata getHdfsBlocksMetadata(String bpid, long[] blockIds)
throws IOException {
throw new UnsupportedOperationException();
}
@Override
public void enableTrash(String bpid) {
throw new UnsupportedOperationException();
}
@Override
public void restoreTrash(String bpid) {
}
@Override
public boolean trashEnabled(String bpid) {
return false;
}
@Override
public void checkAndUpdate(String bpid, long blockId, File diskFile,
File diskMetaFile, FsVolumeSpi vol) {
throw new UnsupportedOperationException();
}
@Override
public List<FsVolumeSpi> getVolumes() {
throw new UnsupportedOperationException();
}
@Override
public DatanodeStorage getStorage(final String storageUuid) {
return storageUuid.equals(storage.getStorageUuid()) ?
storage.dnStorage :
null;
}
@Override
public StorageReport[] getStorageReports(String bpid) {
return new StorageReport[] {storage.getStorageReport(bpid)};
}
@Override
public List<FinalizedReplica> getFinalizedBlocks(String bpid) {
throw new UnsupportedOperationException();
}
@Override
public Map<String, Object> getVolumeInfoMap() {
throw new UnsupportedOperationException();
}
@Override
public RollingLogs createRollingLogs(String bpid, String prefix) {
throw new UnsupportedOperationException();
}
@Override
public FsVolumeSpi getVolume(ExtendedBlock b) {
throw new UnsupportedOperationException();
}
}