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BlockStorageMovementTracker.java
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BlockStorageMovementTracker.java
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/**
* 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.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CompletionService;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.hdfs.server.datanode.StoragePolicySatisfyWorker.BlocksMovementsCompletionHandler;
import org.apache.hadoop.hdfs.server.datanode.StoragePolicySatisfyWorker.BlockMovementResult;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class is used to track the completion of block movement future tasks.
*/
@InterfaceAudience.Private
@InterfaceStability.Unstable
public class BlockStorageMovementTracker implements Runnable {
private static final Logger LOG = LoggerFactory
.getLogger(BlockStorageMovementTracker.class);
private final CompletionService<BlockMovementResult> moverCompletionService;
private final BlocksMovementsCompletionHandler blksMovementscompletionHandler;
// Keeps the information - trackID vs its list of blocks
private final Map<Long, List<Future<BlockMovementResult>>> moverTaskFutures;
private final Map<Long, List<BlockMovementResult>> movementResults;
/**
* BlockStorageMovementTracker constructor.
*
* @param moverCompletionService
* completion service.
* @param handler
* blocks movements completion handler
*/
public BlockStorageMovementTracker(
CompletionService<BlockMovementResult> moverCompletionService,
BlocksMovementsCompletionHandler handler) {
this.moverCompletionService = moverCompletionService;
this.moverTaskFutures = new HashMap<>();
this.blksMovementscompletionHandler = handler;
this.movementResults = new HashMap<>();
}
@Override
public void run() {
while (true) {
if (moverTaskFutures.size() <= 0) {
try {
synchronized (moverTaskFutures) {
// Waiting for mover tasks.
moverTaskFutures.wait(2000);
}
} catch (InterruptedException ignore) {
// ignore
}
}
try {
Future<BlockMovementResult> future = moverCompletionService.take();
if (future != null) {
BlockMovementResult result = future.get();
LOG.debug("Completed block movement. {}", result);
long trackId = result.getTrackId();
List<Future<BlockMovementResult>> blocksMoving = moverTaskFutures
.get(trackId);
blocksMoving.remove(future);
List<BlockMovementResult> resultPerTrackIdList =
addMovementResultToTrackIdList(result);
// Completed all the scheduled blocks movement under this 'trackId'.
if (blocksMoving.isEmpty()) {
synchronized (moverTaskFutures) {
moverTaskFutures.remove(trackId);
}
// handle completed blocks movements per trackId.
blksMovementscompletionHandler.handle(resultPerTrackIdList);
movementResults.remove(trackId);
}
}
} catch (ExecutionException | InterruptedException e) {
// TODO: Do we need failure retries and implement the same if required.
LOG.error("Exception while moving block replica to target storage type",
e);
}
}
}
private List<BlockMovementResult> addMovementResultToTrackIdList(
BlockMovementResult result) {
long trackId = result.getTrackId();
List<BlockMovementResult> perTrackIdList = movementResults.get(trackId);
if (perTrackIdList == null) {
perTrackIdList = new ArrayList<>();
movementResults.put(trackId, perTrackIdList);
}
perTrackIdList.add(result);
return perTrackIdList;
}
/**
* Add future task to the tracking list to check the completion status of the
* block movement.
*
* @param trackID
* tracking Id
* @param futureTask
* future task used for moving the respective block
*/
void addBlock(long trackID, Future<BlockMovementResult> futureTask) {
synchronized (moverTaskFutures) {
List<Future<BlockMovementResult>> futures = moverTaskFutures
.get(Long.valueOf(trackID));
// null for the first task
if (futures == null) {
futures = new ArrayList<>();
moverTaskFutures.put(trackID, futures);
}
futures.add(futureTask);
// Notify waiting tracker thread about the newly added tasks.
moverTaskFutures.notify();
}
}
}