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CheckPointerImpl.java
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CheckPointerImpl.java
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/*
* Copyright (c) 2002-2016 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.impl.transaction.log.checkpoint;
import java.io.IOException;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import org.neo4j.io.pagecache.IOLimiter;
import org.neo4j.kernel.internal.DatabaseHealth;
import org.neo4j.kernel.impl.transaction.log.LogPosition;
import org.neo4j.kernel.impl.transaction.log.TransactionAppender;
import org.neo4j.kernel.impl.transaction.log.TransactionIdStore;
import org.neo4j.kernel.impl.transaction.log.pruning.LogPruning;
import org.neo4j.kernel.impl.transaction.tracing.CheckPointTracer;
import org.neo4j.kernel.impl.transaction.tracing.LogCheckPointEvent;
import org.neo4j.kernel.lifecycle.LifecycleAdapter;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;
import org.neo4j.storageengine.api.StorageEngine;
public class CheckPointerImpl extends LifecycleAdapter implements CheckPointer
{
private final TransactionAppender appender;
private final TransactionIdStore transactionIdStore;
private final CheckPointThreshold threshold;
private final StorageEngine storageEngine;
private final LogPruning logPruning;
private final DatabaseHealth databaseHealth;
private final IOLimiter ioLimiter;
private final Log msgLog;
private final CheckPointTracer tracer;
private final Lock lock;
private long lastCheckPointedTx;
public CheckPointerImpl(
TransactionIdStore transactionIdStore,
CheckPointThreshold threshold,
StorageEngine storageEngine,
LogPruning logPruning,
TransactionAppender appender,
DatabaseHealth databaseHealth,
LogProvider logProvider,
CheckPointTracer tracer,
IOLimiter ioLimiter )
{
this( transactionIdStore,
threshold,
storageEngine,
logPruning,
appender,
databaseHealth,
logProvider,
tracer,
ioLimiter,
new ReentrantLock() );
}
public CheckPointerImpl(
TransactionIdStore transactionIdStore,
CheckPointThreshold threshold,
StorageEngine storageEngine,
LogPruning logPruning,
TransactionAppender appender,
DatabaseHealth databaseHealth,
LogProvider logProvider,
CheckPointTracer tracer,
IOLimiter ioLimiter,
Lock lock )
{
this.appender = appender;
this.transactionIdStore = transactionIdStore;
this.threshold = threshold;
this.storageEngine = storageEngine;
this.logPruning = logPruning;
this.databaseHealth = databaseHealth;
this.ioLimiter = ioLimiter;
this.msgLog = logProvider.getLog( CheckPointerImpl.class );
this.tracer = tracer;
this.lock = lock;
}
@Override
public void start() throws Throwable
{
threshold.initialize( transactionIdStore.getLastClosedTransactionId() );
}
@Override
public long forceCheckPoint( TriggerInfo info ) throws IOException
{
ioLimiter.disableLimit();
lock.lock();
try
{
return doCheckPoint( info, LogCheckPointEvent.NULL );
}
finally
{
lock.unlock();
ioLimiter.enableLimit();
}
}
@Override
public long tryCheckPoint( TriggerInfo info ) throws IOException
{
ioLimiter.disableLimit();
try
{
if ( lock.tryLock() )
{
try
{
return doCheckPoint( info, LogCheckPointEvent.NULL );
}
finally
{
lock.unlock();
}
}
else
{
lock.lock();
try
{
msgLog.info( info.describe( lastCheckPointedTx ) +
" Check pointing was already running, completed now" );
return lastCheckPointedTx;
}
finally
{
lock.unlock();
}
}
}
finally
{
ioLimiter.enableLimit();
}
}
@Override
public long checkPointIfNeeded( TriggerInfo info ) throws IOException
{
lock.lock();
try
{
if ( threshold.isCheckPointingNeeded( transactionIdStore.getLastClosedTransactionId(), info ) )
{
try ( LogCheckPointEvent event = tracer.beginCheckPoint() )
{
return doCheckPoint( info, event );
}
}
return -1;
}
finally
{
lock.unlock();
}
}
private long doCheckPoint( TriggerInfo triggerInfo, LogCheckPointEvent logCheckPointEvent ) throws IOException
{
long[] lastClosedTransaction = transactionIdStore.getLastClosedTransaction();
long lastClosedTransactionId = lastClosedTransaction[0];
LogPosition logPosition = new LogPosition( lastClosedTransaction[1], lastClosedTransaction[2] );
String prefix = triggerInfo.describe( lastClosedTransactionId );
msgLog.info( prefix + " Starting check pointing..." );
/*
* Check kernel health before going into waiting for transactions to be closed, to avoid
* getting into a scenario where we would await a condition that would potentially never
* happen.
*/
databaseHealth.assertHealthy( IOException.class );
/*
* First we flush the store. If we fail now or during the flush, on recovery we'll find the
* earlier check point and replay from there all the log entries. Everything will be ok.
*/
msgLog.info( prefix + " Starting store flush..." );
storageEngine.flushAndForce( ioLimiter );
msgLog.info( prefix + " Store flush completed" );
/*
* Check kernel health before going to write the next check point. In case of a panic this check point
* will be aborted, which is the safest alternative so that the next recovery will have a chance to
* repair the damages.
*/
databaseHealth.assertHealthy( IOException.class );
msgLog.info( prefix + " Starting appending check point entry into the tx log..." );
appender.checkPoint( logPosition, logCheckPointEvent );
threshold.checkPointHappened( lastClosedTransactionId );
msgLog.info( prefix + " Appending check point entry into the tx log completed" );
msgLog.info( prefix + " Check pointing completed" );
/*
* Prune up to the version pointed from the latest check point,
* since it might be an earlier version than the current log version.
*/
logPruning.pruneLogs( logPosition.getLogVersion() );
lastCheckPointedTx = lastClosedTransactionId;
return lastClosedTransactionId;
}
}