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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.procedure.flush;
import java.io.IOException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ThreadPoolExecutor;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseInterfaceAudience;
import org.apache.hadoop.hbase.MetaTableAccessor;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.RegionInfo;
import org.apache.hadoop.hbase.errorhandling.ForeignException;
import org.apache.hadoop.hbase.errorhandling.ForeignExceptionDispatcher;
import org.apache.hadoop.hbase.master.MasterCoprocessorHost;
import org.apache.hadoop.hbase.master.MasterServices;
import org.apache.hadoop.hbase.master.MetricsMaster;
import org.apache.hadoop.hbase.procedure.MasterProcedureManager;
import org.apache.hadoop.hbase.procedure.Procedure;
import org.apache.hadoop.hbase.procedure.ProcedureCoordinator;
import org.apache.hadoop.hbase.procedure.ProcedureCoordinatorRpcs;
import org.apache.hadoop.hbase.procedure.ZKProcedureCoordinator;
import org.apache.hadoop.hbase.util.Pair;
import org.apache.hadoop.hbase.zookeeper.MetaTableLocator;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.zookeeper.KeeperException;
import org.apache.hadoop.hbase.shaded.com.google.common.collect.Lists;
import org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.ProcedureDescription;
@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)
public class MasterFlushTableProcedureManager extends MasterProcedureManager {
public static final String FLUSH_TABLE_PROCEDURE_SIGNATURE = "flush-table-proc";
private static final String FLUSH_TIMEOUT_MILLIS_KEY = "hbase.flush.master.timeoutMillis";
private static final int FLUSH_TIMEOUT_MILLIS_DEFAULT = 60000;
private static final String FLUSH_WAKE_MILLIS_KEY = "hbase.flush.master.wakeMillis";
private static final int FLUSH_WAKE_MILLIS_DEFAULT = 500;
private static final String FLUSH_PROC_POOL_THREADS_KEY =
"hbase.flush.procedure.master.threads";
private static final int FLUSH_PROC_POOL_THREADS_DEFAULT = 1;
private static final Log LOG = LogFactory.getLog(MasterFlushTableProcedureManager.class);
private MasterServices master;
private ProcedureCoordinator coordinator;
private Map procMap = new HashMap<>();
private boolean stopped;
public MasterFlushTableProcedureManager() {};
@Override
public void stop(String why) {
LOG.info("stop: " + why);
this.stopped = true;
}
@Override
public boolean isStopped() {
return this.stopped;
}
@Override
public void initialize(MasterServices master, MetricsMaster metricsMaster)
throws KeeperException, IOException, UnsupportedOperationException {
this.master = master;
// get the configuration for the coordinator
Configuration conf = master.getConfiguration();
long wakeFrequency = conf.getInt(FLUSH_WAKE_MILLIS_KEY, FLUSH_WAKE_MILLIS_DEFAULT);
long timeoutMillis = conf.getLong(FLUSH_TIMEOUT_MILLIS_KEY, FLUSH_TIMEOUT_MILLIS_DEFAULT);
int threads = conf.getInt(FLUSH_PROC_POOL_THREADS_KEY, FLUSH_PROC_POOL_THREADS_DEFAULT);
// setup the procedure coordinator
String name = master.getServerName().toString();
ThreadPoolExecutor tpool = ProcedureCoordinator.defaultPool(name, threads);
ProcedureCoordinatorRpcs comms = new ZKProcedureCoordinator(
master.getZooKeeper(), getProcedureSignature(), name);
this.coordinator = new ProcedureCoordinator(comms, tpool, timeoutMillis, wakeFrequency);
}
@Override
public String getProcedureSignature() {
return FLUSH_TABLE_PROCEDURE_SIGNATURE;
}
@Override
public void execProcedure(ProcedureDescription desc) throws IOException {
TableName tableName = TableName.valueOf(desc.getInstance());
// call pre coproc hook
MasterCoprocessorHost cpHost = master.getMasterCoprocessorHost();
if (cpHost != null) {
cpHost.preTableFlush(tableName);
}
// Get the list of region servers that host the online regions for table.
// We use the procedure instance name to carry the table name from the client.
// It is possible that regions may move after we get the region server list.
// Each region server will get its own online regions for the table.
// We may still miss regions that need to be flushed.
List> regionsAndLocations;
if (TableName.META_TABLE_NAME.equals(tableName)) {
regionsAndLocations = new MetaTableLocator().getMetaRegionsAndLocations(
master.getZooKeeper());
} else {
regionsAndLocations = MetaTableAccessor.getTableRegionsAndLocations(
master.getConnection(), tableName, false);
}
Set regionServers = new HashSet<>(regionsAndLocations.size());
for (Pair region : regionsAndLocations) {
if (region != null && region.getFirst() != null && region.getSecond() != null) {
RegionInfo hri = region.getFirst();
if (hri.isOffline() && (hri.isSplit() || hri.isSplitParent())) continue;
regionServers.add(region.getSecond().toString());
}
}
ForeignExceptionDispatcher monitor = new ForeignExceptionDispatcher(desc.getInstance());
// Kick of the global procedure from the master coordinator to the region servers.
// We rely on the existing Distributed Procedure framework to prevent any concurrent
// procedure with the same name.
Procedure proc = coordinator.startProcedure(monitor, desc.getInstance(),
new byte[0], Lists.newArrayList(regionServers));
monitor.rethrowException();
if (proc == null) {
String msg = "Failed to submit distributed procedure " + desc.getSignature() + " for '"
+ desc.getInstance() + "'. " + "Another flush procedure is running?";
LOG.error(msg);
throw new IOException(msg);
}
procMap.put(tableName, proc);
try {
// wait for the procedure to complete. A timer thread is kicked off that should cancel this
// if it takes too long.
proc.waitForCompleted();
LOG.info("Done waiting - exec procedure " + desc.getSignature() + " for '"
+ desc.getInstance() + "'");
LOG.info("Master flush table procedure is successful!");
} catch (InterruptedException e) {
ForeignException ee =
new ForeignException("Interrupted while waiting for flush table procdure to finish", e);
monitor.receive(ee);
Thread.currentThread().interrupt();
} catch (ForeignException e) {
ForeignException ee =
new ForeignException("Exception while waiting for flush table procdure to finish", e);
monitor.receive(ee);
}
monitor.rethrowException();
}
@Override
public synchronized boolean isProcedureDone(ProcedureDescription desc) throws IOException {
// Procedure instance name is the table name.
TableName tableName = TableName.valueOf(desc.getInstance());
Procedure proc = procMap.get(tableName);
if (proc == null) {
// The procedure has not even been started yet.
// The client would request the procedure and call isProcedureDone().
// The HBaseAdmin.execProcedure() wraps both request and isProcedureDone().
return false;
}
// We reply on the existing Distributed Procedure framework to give us the status.
return proc.isCompleted();
}
}