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https://issues.apache.org/jira/browse/OAK-8067?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Mueller updated OAK-8067:
--------------------------------
Summary: Measure fsync (called when closing the NRT index) and try to
reduce disk I/O (was: Measure fsync (called when closing the NRT index))
> Measure fsync (called when closing the NRT index) and try to reduce disk I/O
> ----------------------------------------------------------------------------
>
> Key: OAK-8067
> URL: https://issues.apache.org/jira/browse/OAK-8067
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: lucene
> Reporter: Thomas Mueller
> Assignee: Thomas Mueller
> Priority: Major
>
> We have seen the following stack trace, and saw that fsync was seemingly very
> slow on the system.
> Two issues: (1) fsync seems to be very slow here (2) fsync is called while
> holding a lock.
> (2) should be resolved by lazy-loading indexes.
> {noformat}
> "oak-lucene-22" daemon prio=1 tid=0x6b1 nid=0xffffffff runnable
> java.lang.Thread.State: RUNNABLE
> atjava.io.FileDescriptor.sync(Native Method)
> at org.apache.lucene.store.FSDirectory.fsync(FSDirectory.java:505)
> at org.apache.lucene.store.FSDirectory.sync(FSDirectory.java:307)
> at
> org.apache.lucene.store.NRTCachingDirectory.sync(NRTCachingDirectory.java:219)
> at
> org.apache.lucene.index.IndexWriter.startCommit(IndexWriter.java:4489)
> at
> org.apache.lucene.index.IndexWriter.prepareCommitInternal(IndexWriter.java:2953)
> - locked <0x20595abf> (a java.lang.Object)
> at
> org.apache.lucene.index.IndexWriter.commitInternal(IndexWriter.java:3049)
> - locked <0x20595abf> (a java.lang.Object)
> at
> org.apache.lucene.index.IndexWriter.closeInternal(IndexWriter.java:1041)
> at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:932)
> - locked <0x20595abf> (a java.lang.Object)
> at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:894)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.hybrid.NRTIndex.close(NRTIndex.java:206)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.hybrid.NRTIndexFactory.closeLast(NRTIndexFactory.java:133)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.hybrid.NRTIndexFactory.createIndex(NRTIndexFactory.java:89)
> - locked <0x85f9b65> (a
> org.apache.jackrabbit.oak.plugins.index.lucene.hybrid.NRTIndexFactory)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.LuceneIndexNodeManager.open(LuceneIndexNodeManager.java:73)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.IndexTracker$1.leave(IndexTracker.java:154)
> at
> org.apache.jackrabbit.oak.spi.commit.EditorDiff.childNodeChanged(EditorDiff.java:152)
> at
> org.apache.jackrabbit.oak.composite.CompositeNodeState$WrappingDiff.childNodeChanged(CompositeNodeState.java:309)
> at
> org.apache.jackrabbit.oak.composite.CompositeNodeState$ChildrenDiffFilter.childNodeChanged(CompositeNodeState.java:256)
> at
> org.apache.jackrabbit.oak.plugins.document.JsopNodeStateDiffer.compareExisting(JsopNodeStateDiffer.java:100)
> at
> org.apache.jackrabbit.oak.plugins.document.JsopNodeStateDiffer.access$000(JsopNodeStateDiffer.java:27)
> at
> org.apache.jackrabbit.oak.plugins.document.JsopNodeStateDiffer$1.childNodeChanged(JsopNodeStateDiffer.java:65)
> at
> org.apache.jackrabbit.oak.plugins.document.DiffCache.parseJsopDiff(DiffCache.java:118)
> at
> org.apache.jackrabbit.oak.plugins.document.JsopNodeStateDiffer.compare(JsopNodeStateDiffer.java:51)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.compare(DocumentNodeStore.java:1766)
> at
> org.apache.jackrabbit.oak.plugins.document.AbstractDocumentNodeState.compareAgainstBaseState(AbstractDocumentNodeState.java:113)
> at
> org.apache.jackrabbit.oak.composite.CompositeNodeState.compareAgainstBaseState(CompositeNodeState.java:163)
> at
> org.apache.jackrabbit.oak.spi.commit.EditorDiff.childNodeChanged(EditorDiff.java:147)
> at
> org.apache.jackrabbit.oak.composite.CompositeNodeState$WrappingDiff.childNodeChanged(CompositeNodeState.java:309)
> at
> org.apache.jackrabbit.oak.composite.CompositeNodeState$ChildrenDiffFilter.childNodeChanged(CompositeNodeState.java:256)
> at
> org.apache.jackrabbit.oak.plugins.document.JsopNodeStateDiffer.compareExisting(JsopNodeStateDiffer.java:100)
> at
> org.apache.jackrabbit.oak.plugins.document.JsopNodeStateDiffer.access$000(JsopNodeStateDiffer.java:27)
> at
> org.apache.jackrabbit.oak.plugins.document.JsopNodeStateDiffer$1.childNodeChanged(JsopNodeStateDiffer.java:65)
> at
> org.apache.jackrabbit.oak.plugins.document.DiffCache.parseJsopDiff(DiffCache.java:118)
> at
> org.apache.jackrabbit.oak.plugins.document.JsopNodeStateDiffer.compare(JsopNodeStateDiffer.java:51)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.compare(DocumentNodeStore.java:1766)
> at
> org.apache.jackrabbit.oak.plugins.document.AbstractDocumentNodeState.compareAgainstBaseState(AbstractDocumentNodeState.java:113)
> at
> org.apache.jackrabbit.oak.composite.CompositeNodeState.compareAgainstBaseState(CompositeNodeState.java:163)
> at
> org.apache.jackrabbit.oak.spi.commit.EditorDiff.process(EditorDiff.java:51)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.IndexTracker.diffAndUpdate(IndexTracker.java:165)
> - locked <0x67aaaebc> (a
> org.apache.jackrabbit.oak.plugins.index.lucene.IndexTracker)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.IndexTracker.update(IndexTracker.java:120)
> - locked <0x67aaaebc> (a
> org.apache.jackrabbit.oak.plugins.index.lucene.IndexTracker)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.LuceneIndexProvider.contentChanged(LuceneIndexProvider.java:73)
> at
> org.apache.jackrabbit.oak.spi.commit.BackgroundObserver$1$1.call(BackgroundObserver.java:127)
> at
> org.apache.jackrabbit.oak.spi.commit.BackgroundObserver$1$1.call(BackgroundObserver.java:121)
> atjava.util.concurrent.FutureTask.run(FutureTask.java:264)
>
> atjava.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
>
> atjava.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
> atjava.lang.Thread.run(Thread.java:834)
> {noformat}
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