/**
* 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 java.io.IOException;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.namenode.NameNode;
import org.apache.hadoop.util.Daemon;
import org.junit.Assert;
import com.google.common.base.Preconditions;
public class BlockManagerTestUtil {
public static void setNodeReplicationLimit(final BlockManager blockManager,
final int limit) {
blockManager.maxReplicationStreams = limit;
}
/** @return the datanode descriptor for the given the given storageID. */
public static DatanodeDescriptor getDatanode(final FSNamesystem ns,
final String storageID) {
ns.readLock();
try {
return ns.getBlockManager().getDatanodeManager().getDatanode(storageID);
} finally {
ns.readUnlock();
}
}
/**
* Refresh block queue counts on the name-node.
*/
public static void updateState(final BlockManager blockManager) {
blockManager.updateState();
}
/**
* @return a tuple of the replica state (number racks, number live
* replicas, and number needed replicas) for the given block.
*/
public static int[] getReplicaInfo(final FSNamesystem namesystem, final Block b) {
final BlockManager bm = namesystem.getBlockManager();
namesystem.readLock();
try {
return new int[]{getNumberOfRacks(bm, b),
bm.countNodes(b).liveReplicas(),
bm.neededReplications.contains(b) ? 1 : 0};
} finally {
namesystem.readUnlock();
}
}
/**
* @return the number of racks over which a given block is replicated
* decommissioning/decommissioned nodes are not counted. corrupt replicas
* are also ignored
*/
private static int getNumberOfRacks(final BlockManager blockManager,
final Block b) {
final Set<String> rackSet = new HashSet<String>(0);
final Collection<DatanodeDescriptor> corruptNodes =
getCorruptReplicas(blockManager).getNodes(b);
for (Iterator<DatanodeDescriptor> it = blockManager.blocksMap.nodeIterator(b);
it.hasNext();) {
DatanodeDescriptor cur = it.next();
if (!cur.isDecommissionInProgress() && !cur.isDecommissioned()) {
if ((corruptNodes == null ) || !corruptNodes.contains(cur)) {
String rackName = cur.getNetworkLocation();
if (!rackSet.contains(rackName)) {
rackSet.add(rackName);
}
}
}
}
return rackSet.size();
}
/**
* @param blockManager
* @return replication monitor thread instance from block manager.
*/
public static Daemon getReplicationThread(final BlockManager blockManager)
{
return blockManager.replicationThread;
}
/**
* Stop the replication monitor thread
* @param blockManager
*/
public static void stopReplicationThread(final BlockManager blockManager)
throws IOException {
blockManager.enableRMTerminationForTesting();
blockManager.replicationThread.interrupt();
try {
blockManager.replicationThread.join();
} catch(InterruptedException ie) {
throw new IOException(
"Interrupted while trying to stop ReplicationMonitor");
}
}
/**
* @param blockManager
* @return corruptReplicas from block manager
*/
public static CorruptReplicasMap getCorruptReplicas(final BlockManager blockManager){
return blockManager.corruptReplicas;
}
/**
* @param blockManager
* @return computed block replication and block invalidation work that can be
* scheduled on data-nodes.
* @throws IOException
*/
public static int getComputedDatanodeWork(final BlockManager blockManager) throws IOException
{
return blockManager.computeDatanodeWork();
}
public static int computeInvalidationWork(BlockManager bm) {
return bm.computeInvalidateWork(Integer.MAX_VALUE);
}
/**
* Compute all the replication and invalidation work for the
* given BlockManager.
*
* This differs from the above functions in that it computes
* replication work for all DNs rather than a particular subset,
* regardless of invalidation/replication limit configurations.
*
* NB: you may want to set
* {@link DFSConfigKeys.DFS_NAMENODE_REPLICATION_MAX_STREAMS_KEY} to
* a high value to ensure that all work is calculated.
*/
public static int computeAllPendingWork(BlockManager bm) {
int work = computeInvalidationWork(bm);
work += bm.computeReplicationWork(Integer.MAX_VALUE);
return work;
}
/**
* Ensure that the given NameNode marks the specified DataNode as
* entirely dead/expired.
* @param nn the NameNode to manipulate
* @param dnName the name of the DataNode
*/
public static void noticeDeadDatanode(NameNode nn, String dnName) {
FSNamesystem namesystem = nn.getNamesystem();
namesystem.writeLock();
try {
DatanodeManager dnm = namesystem.getBlockManager().getDatanodeManager();
HeartbeatManager hbm = dnm.getHeartbeatManager();
DatanodeDescriptor[] dnds = hbm.getDatanodes();
DatanodeDescriptor theDND = null;
for (DatanodeDescriptor dnd : dnds) {
if (dnd.getXferAddr().equals(dnName)) {
theDND = dnd;
}
}
Assert.assertNotNull("Could not find DN with name: " + dnName, theDND);
synchronized (hbm) {
theDND.setLastUpdate(0);
hbm.heartbeatCheck();
}
} finally {
namesystem.writeUnlock();
}
}
/**
* Change whether the block placement policy will prefer the writer's
* local Datanode or not.
* @param prefer
*/
public static void setWritingPrefersLocalNode(
BlockManager bm, boolean prefer) {
BlockPlacementPolicy bpp = bm.getBlockPlacementPolicy();
Preconditions.checkState(bpp instanceof BlockPlacementPolicyDefault,
"Must use default policy, got %s", bpp.getClass());
((BlockPlacementPolicyDefault)bpp).setPreferLocalNode(prefer);
}
/**
* Call heartbeat check function of HeartbeatManager
* @param bm the BlockManager to manipulate
*/
public static void checkHeartbeat(BlockManager bm) {
bm.getDatanodeManager().getHeartbeatManager().heartbeatCheck();
}
}