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* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.indices.recovery;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.message.ParameterizedMessage;
import org.elasticsearch.ElasticsearchTimeoutException;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.util.concurrent.AbstractRunnable;
import org.elasticsearch.common.util.concurrent.ConcurrentCollections;
import org.elasticsearch.index.shard.IndexShard;
import org.elasticsearch.index.shard.IndexShardClosedException;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.threadpool.ThreadPool;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* This class holds a collection of all on going recoveries on the current node (i.e., the node is the target node
* of those recoveries). The class is used to guarantee concurrent semantics such that once a recoveries was done/cancelled/failed
* no other thread will be able to find it. Last, the {@link RecoveryRef} inner class verifies that recovery temporary files
* and store will only be cleared once on going usage is finished.
*/
public class RecoveriesCollection {
/** This is the single source of truth for ongoing recoveries. If it's not here, it was canceled or done */
private final ConcurrentMap onGoingRecoveries = ConcurrentCollections.newConcurrentMap();
private final Logger logger;
private final ThreadPool threadPool;
public RecoveriesCollection(Logger logger, ThreadPool threadPool) {
this.logger = logger;
this.threadPool = threadPool;
}
/**
* Starts are new recovery for the given shard, source node and state
*
* @return the id of the new recovery.
*/
public long startRecovery(IndexShard indexShard, DiscoveryNode sourceNode,
PeerRecoveryTargetService.RecoveryListener listener, TimeValue activityTimeout) {
RecoveryTarget recoveryTarget = new RecoveryTarget(indexShard, sourceNode, listener);
startRecoveryInternal(recoveryTarget, activityTimeout);
return recoveryTarget.recoveryId();
}
private void startRecoveryInternal(RecoveryTarget recoveryTarget, TimeValue activityTimeout) {
RecoveryTarget existingTarget = onGoingRecoveries.putIfAbsent(recoveryTarget.recoveryId(), recoveryTarget);
assert existingTarget == null : "found two RecoveryStatus instances with the same id";
logger.trace("{} started recovery from {}, id [{}]", recoveryTarget.shardId(), recoveryTarget.sourceNode(),
recoveryTarget.recoveryId());
threadPool.schedule(new RecoveryMonitor(recoveryTarget.recoveryId(), recoveryTarget.lastAccessTime(), activityTimeout),
activityTimeout, ThreadPool.Names.GENERIC);
}
/**
* Resets the recovery and performs a recovery restart on the currently recovering index shard
*
* @see IndexShard#performRecoveryRestart()
* @return newly created RecoveryTarget
*/
public RecoveryTarget resetRecovery(final long recoveryId, final TimeValue activityTimeout) {
RecoveryTarget oldRecoveryTarget = null;
final RecoveryTarget newRecoveryTarget;
try {
synchronized (onGoingRecoveries) {
// swap recovery targets in a synchronized block to ensure that the newly added recovery target is picked up by
// cancelRecoveriesForShard whenever the old recovery target is picked up
oldRecoveryTarget = onGoingRecoveries.remove(recoveryId);
if (oldRecoveryTarget == null) {
return null;
}
newRecoveryTarget = oldRecoveryTarget.retryCopy();
startRecoveryInternal(newRecoveryTarget, activityTimeout);
}
// Closes the current recovery target
boolean successfulReset = oldRecoveryTarget.resetRecovery(newRecoveryTarget.cancellableThreads());
if (successfulReset) {
logger.trace("{} restarted recovery from {}, id [{}], previous id [{}]", newRecoveryTarget.shardId(),
newRecoveryTarget.sourceNode(), newRecoveryTarget.recoveryId(), oldRecoveryTarget.recoveryId());
return newRecoveryTarget;
} else {
logger.trace("{} recovery could not be reset as it is already cancelled, recovery from {}, id [{}], previous id [{}]",
newRecoveryTarget.shardId(), newRecoveryTarget.sourceNode(), newRecoveryTarget.recoveryId(),
oldRecoveryTarget.recoveryId());
cancelRecovery(newRecoveryTarget.recoveryId(), "recovery cancelled during reset");
return null;
}
} catch (Exception e) {
// fail shard to be safe
oldRecoveryTarget.notifyListener(new RecoveryFailedException(oldRecoveryTarget.state(), "failed to retry recovery", e), true);
return null;
}
}
public RecoveryTarget getRecoveryTarget(long id) {
return onGoingRecoveries.get(id);
}
/**
* gets the {@link RecoveryTarget } for a given id. The RecoveryStatus returned has it's ref count already incremented
* to make sure it's safe to use. However, you must call {@link RecoveryTarget#decRef()} when you are done with it, typically
* by using this method in a try-with-resources clause.
*
* Returns null if recovery is not found
*/
public RecoveryRef getRecovery(long id) {
RecoveryTarget status = onGoingRecoveries.get(id);
if (status != null && status.tryIncRef()) {
return new RecoveryRef(status);
}
return null;
}
/** Similar to {@link #getRecovery(long)} but throws an exception if no recovery is found */
public RecoveryRef getRecoverySafe(long id, ShardId shardId) {
RecoveryRef recoveryRef = getRecovery(id);
if (recoveryRef == null) {
throw new IndexShardClosedException(shardId);
}
assert recoveryRef.target().shardId().equals(shardId);
return recoveryRef;
}
/** cancel the recovery with the given id (if found) and remove it from the recovery collection */
public boolean cancelRecovery(long id, String reason) {
RecoveryTarget removed = onGoingRecoveries.remove(id);
boolean cancelled = false;
if (removed != null) {
logger.trace("{} canceled recovery from {}, id [{}] (reason [{}])",
removed.shardId(), removed.sourceNode(), removed.recoveryId(), reason);
removed.cancel(reason);
cancelled = true;
}
return cancelled;
}
/**
* fail the recovery with the given id (if found) and remove it from the recovery collection
*
* @param id id of the recovery to fail
* @param e exception with reason for the failure
* @param sendShardFailure true a shard failed message should be sent to the master
*/
public void failRecovery(long id, RecoveryFailedException e, boolean sendShardFailure) {
RecoveryTarget removed = onGoingRecoveries.remove(id);
if (removed != null) {
logger.trace("{} failing recovery from {}, id [{}]. Send shard failure: [{}]", removed.shardId(), removed.sourceNode(),
removed.recoveryId(), sendShardFailure);
removed.fail(e, sendShardFailure);
}
}
/** mark the recovery with the given id as done (if found) */
public void markRecoveryAsDone(long id) {
RecoveryTarget removed = onGoingRecoveries.remove(id);
if (removed != null) {
logger.trace("{} marking recovery from {} as done, id [{}]", removed.shardId(), removed.sourceNode(), removed.recoveryId());
removed.markAsDone();
}
}
/** the number of ongoing recoveries */
public int size() {
return onGoingRecoveries.size();
}
/**
* cancel all ongoing recoveries for the given shard
*
* @param reason reason for cancellation
* @param shardId shardId for which to cancel recoveries
* @return true if a recovery was cancelled
*/
public boolean cancelRecoveriesForShard(ShardId shardId, String reason) {
boolean cancelled = false;
List matchedRecoveries = new ArrayList<>();
synchronized (onGoingRecoveries) {
for (Iterator it = onGoingRecoveries.values().iterator(); it.hasNext(); ) {
RecoveryTarget status = it.next();
if (status.shardId().equals(shardId)) {
matchedRecoveries.add(status);
it.remove();
}
}
}
for (RecoveryTarget removed : matchedRecoveries) {
logger.trace("{} canceled recovery from {}, id [{}] (reason [{}])",
removed.shardId(), removed.sourceNode(), removed.recoveryId(), reason);
removed.cancel(reason);
cancelled = true;
}
return cancelled;
}
/**
* a reference to {@link RecoveryTarget}, which implements {@link AutoCloseable}. closing the reference
* causes {@link RecoveryTarget#decRef()} to be called. This makes sure that the underlying resources
* will not be freed until {@link RecoveryRef#close()} is called.
*/
public static class RecoveryRef implements AutoCloseable {
private final RecoveryTarget status;
private final AtomicBoolean closed = new AtomicBoolean(false);
/**
* Important: {@link RecoveryTarget#tryIncRef()} should
* be *successfully* called on status before
*/
public RecoveryRef(RecoveryTarget status) {
this.status = status;
this.status.setLastAccessTime();
}
@Override
public void close() {
if (closed.compareAndSet(false, true)) {
status.decRef();
}
}
public RecoveryTarget target() {
return status;
}
}
private class RecoveryMonitor extends AbstractRunnable {
private final long recoveryId;
private final TimeValue checkInterval;
private volatile long lastSeenAccessTime;
private RecoveryMonitor(long recoveryId, long lastSeenAccessTime, TimeValue checkInterval) {
this.recoveryId = recoveryId;
this.checkInterval = checkInterval;
this.lastSeenAccessTime = lastSeenAccessTime;
}
@Override
public void onFailure(Exception e) {
logger.error(() -> new ParameterizedMessage("unexpected error while monitoring recovery [{}]", recoveryId), e);
}
@Override
protected void doRun() throws Exception {
RecoveryTarget status = onGoingRecoveries.get(recoveryId);
if (status == null) {
logger.trace("[monitor] no status found for [{}], shutting down", recoveryId);
return;
}
long accessTime = status.lastAccessTime();
if (accessTime == lastSeenAccessTime) {
String message = "no activity after [" + checkInterval + "]";
failRecovery(recoveryId,
new RecoveryFailedException(status.state(), message, new ElasticsearchTimeoutException(message)),
true // to be safe, we don't know what go stuck
);
return;
}
lastSeenAccessTime = accessTime;
logger.trace("[monitor] rescheduling check for [{}]. last access time is [{}]", recoveryId, lastSeenAccessTime);
threadPool.schedule(this, checkInterval, ThreadPool.Names.GENERIC);
}
}
}