You are viewing a plain text version of this content. The canonical link for it is here.
Posted to oak-issues@jackrabbit.apache.org by "Marcel Reutegger (JIRA)" <ji...@apache.org> on 2015/04/28 09:01:07 UTC
[jira] [Updated] (OAK-2815) Persistent cache may block commit
[ https://issues.apache.org/jira/browse/OAK-2815?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Marcel Reutegger updated OAK-2815:
----------------------------------
Attachment: OAK-2815.patch
The attached patch changes the default for the {{compact}} option to disabled. Disabling the (already disabled) feature in the configuration is still possible for backwards compatibility of existing configurations.
[~tmueller], WDYT?
> Persistent cache may block commit
> ---------------------------------
>
> Key: OAK-2815
> URL: https://issues.apache.org/jira/browse/OAK-2815
> Project: Jackrabbit Oak
> Issue Type: Bug
> Affects Versions: 1.2
> Reporter: Marcel Reutegger
> Assignee: Marcel Reutegger
> Fix For: 1.3.0
>
> Attachments: OAK-2815.patch
>
>
> The persistent cache may block a commit for a rather long time if the generation is switched during the commit. The default configuration tells the persistent cache to compact the store when it is closed. This is exactly what happens when a generation is switched.
> I think it would be best to disable compaction.
> I was able to reproduce it with the {{ContinuousRevisionGCTest}} in oak-run with {{-DgarbageRatio=0.9}}, but it probably also happens with the default garbage ratio of 0.5.
> Once the MVStore reaches 1GB, the console will show something like this:
> {noformat}
> Performed RevisionGC in 6.331 s (VersionGCStats{ignoredGCDueToCheckPoint=false, deletedDocGCCount=54054, splitDocGCCount=0, intermediateSplitDocGCCount=0, timeToCollectDeletedDocs=622.8 ms, timeTakenToDeleteDocs=5.708 s})
> .................
> Performed RevisionGC in 9.232 s (VersionGCStats{ignoredGCDueToCheckPoint=false, deletedDocGCCount=26026, splitDocGCCount=0, intermediateSplitDocGCCount=0, timeToCollectDeletedDocs=6.549 s, timeTakenToDeleteDocs=2.682 s})
> Performed RevisionGC in 1.269 s (VersionGCStats{ignoredGCDueToCheckPoint=false, deletedDocGCCount=12012, splitDocGCCount=0, intermediateSplitDocGCCount=0, timeToCollectDeletedDocs=133.5 ms, timeTakenToDeleteDocs=1.134 s})
> Performed RevisionGC in 20.49 ms (VersionGCStats{ignoredGCDueToCheckPoint=false, deletedDocGCCount=0, splitDocGCCount=0, intermediateSplitDocGCCount=0, timeToCollectDeletedDocs=19.50 ms, timeTakenToDeleteDocs=0.000 ns})
> .15:19:16.682 [DocumentNodeStore background update thread] INFO o.a.j.o.p.document.DocumentNodeStore - Background operations stats (clean:0, split:0, lock:35581, write:1, num:5)
> ............
> Performed RevisionGC in 8.449 s (VersionGCStats{ignoredGCDueToCheckPoint=false, deletedDocGCCount=2002, splitDocGCCount=0, intermediateSplitDocGCCount=0, timeToCollectDeletedDocs=8.276 s, timeTakenToDeleteDocs=171.7 ms})
> {noformat}
> The background update thread had to wait 35 seconds for the backgroundOperations lock, which was held by the committing thread:
> {noformat}
> "Thread-2" prio=5 tid=0x00007f986b9a7800 nid=0x6803 runnable [0x0000000112780000]
> java.lang.Thread.State: RUNNABLE
> at org.h2.compress.CompressLZF.compress(CompressLZF.java:239)
> at org.h2.mvstore.Page.write(Page.java:754)
> at org.h2.mvstore.Page.writeUnsavedRecursive(Page.java:816)
> at org.h2.mvstore.Page.writeUnsavedRecursive(Page.java:822)
> at org.h2.mvstore.Page.writeUnsavedRecursive(Page.java:822)
> at org.h2.mvstore.MVStore.storeNowTry(MVStore.java:1065)
> at org.h2.mvstore.MVStore.storeNow(MVStore.java:981)
> at org.h2.mvstore.MVStore.commitAndSave(MVStore.java:970)
> - locked <0x00000007e15cccf0> (a org.h2.mvstore.MVStore)
> at org.h2.mvstore.MVStore.beforeWrite(MVStore.java:2084)
> at org.h2.mvstore.MVMap.beforeWrite(MVMap.java:1046)
> at org.h2.mvstore.MVMap.copy(MVMap.java:1231)
> at org.h2.mvstore.MVMap.copy(MVMap.java:1248)
> at org.h2.mvstore.MVMap.copy(MVMap.java:1248)
> at org.h2.mvstore.MVMap.copyFrom(MVMap.java:1218)
> at org.h2.mvstore.MVStoreTool.compact(MVStoreTool.java:493)
> at org.h2.mvstore.MVStoreTool.compact(MVStoreTool.java:458)
> at org.h2.mvstore.MVStoreTool.compact(MVStoreTool.java:404)
> at org.apache.jackrabbit.oak.plugins.document.persistentCache.PersistentCache$1.closeStore(PersistentCache.java:235)
> - locked <0x00000007c0c82760> (a org.apache.jackrabbit.oak.plugins.document.persistentCache.PersistentCache$1)
> at org.apache.jackrabbit.oak.plugins.document.persistentCache.PersistentCache.switchGenerationIfNeeded(PersistentCache.java:372)
> - locked <0x00000007c03a6c00> (a org.apache.jackrabbit.oak.plugins.document.persistentCache.PersistentCache)
> at org.apache.jackrabbit.oak.plugins.document.persistentCache.NodeCache.write(NodeCache.java:85)
> at org.apache.jackrabbit.oak.plugins.document.persistentCache.NodeCache.put(NodeCache.java:130)
> at org.apache.jackrabbit.oak.plugins.document.LocalDiffCache$1.done(LocalDiffCache.java:98)
> at org.apache.jackrabbit.oak.plugins.document.Commit.applyToCache(Commit.java:602)
> at org.apache.jackrabbit.oak.plugins.document.CommitQueue.afterTrunkCommit(CommitQueue.java:127)
> - locked <0x00000007c03a46f0> (a org.apache.jackrabbit.oak.plugins.document.CommitQueue)
> at org.apache.jackrabbit.oak.plugins.document.CommitQueue.done(CommitQueue.java:83)
> at org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.done(DocumentNodeStore.java:644)
> at org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreBranch.persist(DocumentNodeStoreBranch.java:338)
> at org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreBranch.persist(DocumentNodeStoreBranch.java:304)
> at org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreBranch.access$200(DocumentNodeStoreBranch.java:52)
> at org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreBranch$InMemory.merge(DocumentNodeStoreBranch.java:541)
> at org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreBranch.merge0(DocumentNodeStoreBranch.java:230)
> at org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreBranch.merge(DocumentNodeStoreBranch.java:171)
> at org.apache.jackrabbit.oak.plugins.document.DocumentRootBuilder.merge(DocumentRootBuilder.java:158)
> at org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.merge(DocumentNodeStore.java:1490)
> at org.apache.jackrabbit.oak.core.MutableRoot.commit(MutableRoot.java:247)
> at org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.commit(SessionDelegate.java:341)
> at org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.save(SessionDelegate.java:487)
> at org.apache.jackrabbit.oak.jcr.session.SessionImpl$8.performVoid(SessionImpl.java:424)
> at org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.performVoid(SessionDelegate.java:268)
> at org.apache.jackrabbit.oak.jcr.session.SessionImpl.save(SessionImpl.java:421)
> at org.apache.jackrabbit.oak.ContinuousRevisionGCTest$Writer.run(ContinuousRevisionGCTest.java:72)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)