org.apache.hadoop.hbase.replication.master.ReplicationLogCleaner Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of hbase-server Show documentation
Show all versions of hbase-server Show documentation
Server functionality for HBase
/*
*
* 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.hbase.replication.master;
import com.google.common.annotations.VisibleForTesting;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.hbase.Abortable;
import org.apache.hadoop.hbase.HBaseInterfaceAudience;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.master.cleaner.BaseLogCleanerDelegate;
import org.apache.hadoop.hbase.replication.ReplicationException;
import org.apache.hadoop.hbase.replication.ReplicationFactory;
import org.apache.hadoop.hbase.replication.ReplicationQueuesClient;
import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.Sets;
import org.apache.zookeeper.KeeperException;
/**
* Implementation of a log cleaner that checks if a log is still scheduled for
* replication before deleting it when its TTL is over.
*/
@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)
public class ReplicationLogCleaner extends BaseLogCleanerDelegate {
private static final Log LOG = LogFactory.getLog(ReplicationLogCleaner.class);
private ZooKeeperWatcher zkw;
private ReplicationQueuesClient replicationQueues;
private boolean stopped = false;
@Override
public Iterable getDeletableFiles(Iterable files) {
// all members of this class are null if replication is disabled,
// so we cannot filter the files
if (this.getConf() == null) {
return files;
}
final Set wals;
try {
// The concurrently created new WALs may not be included in the return list,
// but they won't be deleted because they're not in the checking set.
wals = loadWALsFromQueues();
} catch (KeeperException e) {
LOG.warn("Failed to read zookeeper, skipping checking deletable files");
return Collections.emptyList();
}
return Iterables.filter(files, new Predicate() {
@Override
public boolean apply(FileStatus file) {
String wal = file.getPath().getName();
boolean logInReplicationQueue = wals.contains(wal);
if (LOG.isDebugEnabled()) {
if (logInReplicationQueue) {
LOG.debug("Found log in ZK, keeping: " + wal);
} else {
LOG.debug("Didn't find this log in ZK, deleting: " + wal);
}
}
return !logInReplicationQueue;
}});
}
/**
* Load all wals in all replication queues from ZK. This method guarantees to return a
* snapshot which contains all WALs in the zookeeper at the start of this call even there
* is concurrent queue failover. However, some newly created WALs during the call may
* not be included.
*/
private Set loadWALsFromQueues() throws KeeperException {
for (int retry = 0; ; retry++) {
int v0 = replicationQueues.getQueuesZNodeCversion();
List rss = replicationQueues.getListOfReplicators();
if (rss == null || rss.isEmpty()) {
LOG.debug("Didn't find any region server that replicates, won't prevent any deletions.");
return ImmutableSet.of();
}
Set wals = Sets.newHashSet();
for (String rs : rss) {
List listOfPeers = replicationQueues.getAllQueues(rs);
// if rs just died, this will be null
if (listOfPeers == null) {
continue;
}
for (String id : listOfPeers) {
List peersWals = replicationQueues.getLogsInQueue(rs, id);
if (peersWals != null) {
wals.addAll(peersWals);
}
}
}
int v1 = replicationQueues.getQueuesZNodeCversion();
if (v0 == v1) {
return wals;
}
LOG.info(String.format("Replication queue node cversion changed from %d to %d, retry = %d",
v0, v1, retry));
}
}
@Override
public void setConf(Configuration config) {
// If replication is disabled, keep all members null
if (!config.getBoolean(HConstants.REPLICATION_ENABLE_KEY,
HConstants.REPLICATION_ENABLE_DEFAULT)) {
LOG.warn("Not configured - allowing all wals to be deleted");
return;
}
// Make my own Configuration. Then I'll have my own connection to zk that
// I can close myself when comes time.
Configuration conf = new Configuration(config);
try {
setConf(conf, new ZooKeeperWatcher(conf, "replicationLogCleaner", null));
} catch (IOException e) {
LOG.error("Error while configuring " + this.getClass().getName(), e);
}
}
@VisibleForTesting
public void setConf(Configuration conf, ZooKeeperWatcher zk) {
super.setConf(conf);
try {
this.zkw = zk;
this.replicationQueues = ReplicationFactory.getReplicationQueuesClient(zkw, conf,
new WarnOnlyAbortable());
this.replicationQueues.init();
} catch (ReplicationException e) {
LOG.error("Error while configuring " + this.getClass().getName(), e);
}
}
@VisibleForTesting
public void setConf(Configuration conf, ZooKeeperWatcher zk,
ReplicationQueuesClient replicationQueuesClient) {
super.setConf(conf);
this.zkw = zk;
this.replicationQueues = replicationQueuesClient;
}
@Override
public void stop(String why) {
if (this.stopped) return;
this.stopped = true;
if (this.zkw != null) {
LOG.info("Stopping " + this.zkw);
this.zkw.close();
}
}
@Override
public boolean isStopped() {
return this.stopped;
}
public static class WarnOnlyAbortable implements Abortable {
@Override
public void abort(String why, Throwable e) {
LOG.warn("ReplicationLogCleaner received abort, ignoring. Reason: " + why);
if (LOG.isDebugEnabled()) {
LOG.debug(e);
}
}
@Override
public boolean isAborted() {
return false;
}
}
}