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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.master;
import java.lang.Thread.UncaughtExceptionHandler;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.TimeUnit;
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.hbase.HRegionInfo;
import org.apache.hadoop.hbase.Server;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.master.RegionState.State;
/**
* Run bulk assign. Does one RCP per regionserver passing a
* batch of regions using {@link GeneralBulkAssigner.SingleServerBulkAssigner}.
*/
@InterfaceAudience.Private
public class GeneralBulkAssigner extends BulkAssigner {
private static final Log LOG = LogFactory.getLog(GeneralBulkAssigner.class);
private Map> failedPlans
= new ConcurrentHashMap>();
private ExecutorService pool;
final Map> bulkPlan;
final AssignmentManager assignmentManager;
final boolean waitTillAllAssigned;
public GeneralBulkAssigner(final Server server,
final Map> bulkPlan,
final AssignmentManager am, final boolean waitTillAllAssigned) {
super(server);
this.bulkPlan = bulkPlan;
this.assignmentManager = am;
this.waitTillAllAssigned = waitTillAllAssigned;
}
@Override
protected String getThreadNamePrefix() {
return this.server.getServerName() + "-GeneralBulkAssigner";
}
@Override
protected void populatePool(ExecutorService pool) {
this.pool = pool; // shut it down later in case some assigner hangs
for (Map.Entry> e: this.bulkPlan.entrySet()) {
pool.execute(new SingleServerBulkAssigner(e.getKey(), e.getValue(),
this.assignmentManager, this.failedPlans));
}
}
/**
*
* @param timeout How long to wait.
* @return true if done.
*/
@Override
protected boolean waitUntilDone(final long timeout)
throws InterruptedException {
Set regionSet = new HashSet();
for (List regionList : bulkPlan.values()) {
regionSet.addAll(regionList);
}
pool.shutdown(); // no more task allowed
int serverCount = bulkPlan.size();
int regionCount = regionSet.size();
long startTime = System.currentTimeMillis();
long rpcWaitTime = startTime + timeout;
while (!server.isStopped() && !pool.isTerminated()
&& rpcWaitTime > System.currentTimeMillis()) {
if (failedPlans.isEmpty()) {
pool.awaitTermination(100, TimeUnit.MILLISECONDS);
} else {
reassignFailedPlans();
}
}
if (!pool.isTerminated()) {
LOG.warn("bulk assigner is still running after "
+ (System.currentTimeMillis() - startTime) + "ms, shut it down now");
// some assigner hangs, can't wait any more, shutdown the pool now
List notStarted = pool.shutdownNow();
if (notStarted != null && !notStarted.isEmpty()) {
server.abort("some single server assigner hasn't started yet"
+ " when the bulk assigner timed out", null);
return false;
}
}
int reassigningRegions = 0;
if (!failedPlans.isEmpty() && !server.isStopped()) {
reassigningRegions = reassignFailedPlans();
}
Configuration conf = server.getConfiguration();
long perRegionOpenTimeGuesstimate =
conf.getLong("hbase.bulk.assignment.perregion.open.time", 1000);
long endTime = Math.max(System.currentTimeMillis(), rpcWaitTime)
+ perRegionOpenTimeGuesstimate * (reassigningRegions + 1);
RegionStates regionStates = assignmentManager.getRegionStates();
// We're not synchronizing on regionsInTransition now because we don't use any iterator.
while (!regionSet.isEmpty() && !server.isStopped() && endTime > System.currentTimeMillis()) {
Iterator regionInfoIterator = regionSet.iterator();
while (regionInfoIterator.hasNext()) {
HRegionInfo hri = regionInfoIterator.next();
if (regionStates.isRegionOnline(hri) || regionStates.isRegionInState(hri,
State.SPLITTING, State.SPLIT, State.MERGING, State.MERGED)) {
regionInfoIterator.remove();
}
}
if (!waitTillAllAssigned) {
// No need to wait, let assignment going on asynchronously
break;
}
if (!regionSet.isEmpty()) {
regionStates.waitForUpdate(100);
}
}
if (LOG.isDebugEnabled()) {
long elapsedTime = System.currentTimeMillis() - startTime;
String status = "successfully";
if (!regionSet.isEmpty()) {
status = "with " + regionSet.size() + " regions still in transition";
}
LOG.debug("bulk assigning total " + regionCount + " regions to "
+ serverCount + " servers, took " + elapsedTime + "ms, " + status);
}
return regionSet.isEmpty();
}
@Override
protected long getTimeoutOnRIT() {
// Guess timeout. Multiply the max number of regions on a server
// by how long we think one region takes opening.
Configuration conf = server.getConfiguration();
long perRegionOpenTimeGuesstimate =
conf.getLong("hbase.bulk.assignment.perregion.open.time", 1000);
int maxRegionsPerServer = 1;
for (List regionList : bulkPlan.values()) {
int size = regionList.size();
if (size > maxRegionsPerServer) {
maxRegionsPerServer = size;
}
}
long timeout = perRegionOpenTimeGuesstimate * maxRegionsPerServer
+ conf.getLong("hbase.regionserver.rpc.startup.waittime", 60000)
+ conf.getLong("hbase.bulk.assignment.perregionserver.rpc.waittime",
30000) * bulkPlan.size();
LOG.debug("Timeout-on-RIT=" + timeout);
return timeout;
}
@Override
protected UncaughtExceptionHandler getUncaughtExceptionHandler() {
return new UncaughtExceptionHandler() {
@Override
public void uncaughtException(Thread t, Throwable e) {
LOG.warn("Assigning regions in " + t.getName(), e);
}
};
}
private int reassignFailedPlans() {
List reassigningRegions = new ArrayList();
for (Map.Entry> e : failedPlans.entrySet()) {
LOG.info("Failed assigning " + e.getValue().size()
+ " regions to server " + e.getKey() + ", reassigning them");
reassigningRegions.addAll(failedPlans.remove(e.getKey()));
}
RegionStates regionStates = assignmentManager.getRegionStates();
for (HRegionInfo region : reassigningRegions) {
if (!regionStates.isRegionOnline(region)) {
assignmentManager.invokeAssign(region);
}
}
return reassigningRegions.size();
}
/**
* Manage bulk assigning to a server.
*/
static class SingleServerBulkAssigner implements Runnable {
private final ServerName regionserver;
private final List regions;
private final AssignmentManager assignmentManager;
private final Map> failedPlans;
SingleServerBulkAssigner(final ServerName regionserver,
final List regions, final AssignmentManager am,
final Map> failedPlans) {
this.regionserver = regionserver;
this.regions = regions;
this.assignmentManager = am;
this.failedPlans = failedPlans;
}
@Override
public void run() {
try {
if (!assignmentManager.assign(regionserver, regions)) {
failedPlans.put(regionserver, regions);
}
} catch (Throwable t) {
LOG.warn("Failed bulking assigning " + regions.size()
+ " region(s) to " + regionserver.getServerName()
+ ", and continue to bulk assign others", t);
failedPlans.put(regionserver, regions);
}
}
}
}