org.apache.hadoop.hdfs.server.common.sps.BlockStorageMovementTracker Maven / Gradle / Ivy
/**
* 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.common.sps;
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.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class is used to track the completion of block movement future tasks.
*/
@InterfaceAudience.Private
@InterfaceStability.Evolving
public class BlockStorageMovementTracker implements Runnable {
private static final Logger LOG = LoggerFactory
.getLogger(BlockStorageMovementTracker.class);
private final CompletionService
moverCompletionService;
private final BlocksMovementsStatusHandler blksMovementsStatusHandler;
private volatile boolean running = true;
/**
* BlockStorageMovementTracker constructor.
*
* @param moverCompletionService
* completion service.
* @param handler
* blocks movements status handler
*/
public BlockStorageMovementTracker(
CompletionService moverCompletionService,
BlocksMovementsStatusHandler handler) {
this.moverCompletionService = moverCompletionService;
this.blksMovementsStatusHandler = handler;
}
@Override
public void run() {
while (running) {
try {
Future future = moverCompletionService
.take();
if (future != null) {
BlockMovementAttemptFinished result = future.get();
LOG.debug("Completed block movement. {}", result);
if (running && blksMovementsStatusHandler != null) {
// handle completed block movement.
blksMovementsStatusHandler.handle(result);
}
}
} catch (InterruptedException e) {
if (running) {
LOG.error("Exception while moving block replica to target storage"
+ " type", e);
}
} catch (ExecutionException 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);
}
}
}
/**
* Sets running flag to false.
*/
public void stopTracking() {
running = false;
}
}