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Move check pointing in its own thread
Check pointing can be triggered based on time and number of transactions, default values are 5 minutes and 100_000 txs respectively. Introduce CheckPointTracer in order to trace check point events, which are now disconnected from LogAppendEvents.
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84 changes: 84 additions & 0 deletions
84
...l/src/main/java/org/neo4j/kernel/impl/transaction/log/checkpoint/CheckPointScheduler.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| /* | ||
| * Copyright (c) 2002-2015 "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 org.neo4j.kernel.impl.store.UnderlyingStorageException; | ||
| import org.neo4j.kernel.impl.util.JobScheduler; | ||
| import org.neo4j.kernel.lifecycle.LifecycleAdapter; | ||
|
|
||
| import static java.util.concurrent.TimeUnit.MILLISECONDS; | ||
| import static org.neo4j.kernel.impl.util.JobScheduler.Groups.checkPoint; | ||
|
|
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| public class CheckPointScheduler extends LifecycleAdapter | ||
| { | ||
| private final CheckPointer checkPointer; | ||
| private final JobScheduler scheduler; | ||
| private final long recurringPeriodMillis; | ||
| private final Runnable job = new Runnable() | ||
| { | ||
| @Override | ||
| public void run() | ||
| { | ||
| try | ||
| { | ||
| checkPointer.checkPointIfNeeded(); | ||
| } | ||
| catch ( IOException e ) | ||
| { | ||
| // no need to reschedule since the check pointer has raised a kernel panic and a shutdown is expected | ||
| throw new UnderlyingStorageException( e ); | ||
| } | ||
|
|
||
| // reschedule only if it is not stopped | ||
| if ( !stopped ) | ||
| { | ||
| handle = scheduler.schedule( checkPoint, job, recurringPeriodMillis, MILLISECONDS ); | ||
| } | ||
| } | ||
| }; | ||
|
|
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| private volatile JobScheduler.JobHandle handle; | ||
| private volatile boolean stopped = false; | ||
|
|
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| public CheckPointScheduler( CheckPointer checkPointer, JobScheduler scheduler, long recurringPeriodMillis ) | ||
| { | ||
| this.checkPointer = checkPointer; | ||
| this.scheduler = scheduler; | ||
| this.recurringPeriodMillis = recurringPeriodMillis; | ||
| } | ||
|
|
||
| @Override | ||
| public void start() throws Throwable | ||
| { | ||
| handle = scheduler.schedule( checkPoint, job, recurringPeriodMillis, MILLISECONDS ); | ||
| } | ||
|
|
||
| @Override | ||
| public void stop() throws Throwable | ||
| { | ||
| stopped = true; | ||
| if ( handle != null ) | ||
| { | ||
| handle.cancel( false ); | ||
| } | ||
| } | ||
| } |
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56 changes: 56 additions & 0 deletions
56
.../src/main/java/org/neo4j/kernel/impl/transaction/log/checkpoint/CheckPointThresholds.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| /* | ||
| * Copyright (c) 2002-2015 "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; | ||
|
|
||
| public class CheckPointThresholds | ||
| { | ||
| public static CheckPointThreshold or( final CheckPointThreshold... thresholds ) | ||
| { | ||
| return new CheckPointThreshold() | ||
| { | ||
| @Override | ||
| public boolean isCheckPointingNeeded() | ||
| { | ||
| for ( CheckPointThreshold threshold : thresholds ) | ||
| { | ||
| if ( threshold.isCheckPointingNeeded() ) | ||
| { | ||
| return true; | ||
| } | ||
| } | ||
|
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| return false; | ||
| } | ||
|
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| @Override | ||
| public void checkPointHappened( long transactionId ) | ||
| { | ||
| for ( CheckPointThreshold threshold : thresholds ) | ||
| { | ||
| threshold.checkPointHappened( transactionId ); | ||
| } | ||
| } | ||
| }; | ||
| } | ||
|
|
||
| private CheckPointThresholds() | ||
| { | ||
| } | ||
| } |
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