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https://issues.apache.org/jira/browse/OAK-2761?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tomek Rękawek updated OAK-2761:
-------------------------------
Attachment: OAK-2761-trunk.patch
> Persistent cache: add data in a different thread
> ------------------------------------------------
>
> Key: OAK-2761
> URL: https://issues.apache.org/jira/browse/OAK-2761
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: cache, core, mongomk
> Reporter: Thomas Mueller
> Assignee: Thomas Mueller
> Labels: resilience
> Fix For: 1.4
>
> Attachments: AsyncCacheTest.patch, OAK-2761-trunk.patch
>
>
> The persistent cache usually stores data in a background thread, but
> sometimes (if a lot of data is added quickly) the foreground thread is
> blocked.
> Even worse, switching the cache file can happen in a foreground thread, with
> the following stack trace.
> {noformat}
> "127.0.0.1 [1428931262206] POST /bin/replicate.json HTTP/1.1" prio=5
> tid=0x00007fe5df819800 nid=0x9907 runnable [0x0000000113fc4000]
> java.lang.Thread.State: RUNNABLE
> ...
> at org.h2.mvstore.MVStoreTool.compact(MVStoreTool.java:404)
> at
> org.apache.jackrabbit.oak.plugins.document.persistentCache.PersistentCache$1.closeStore(PersistentCache.java:213)
> - locked <0x0000000782483050> (a
> org.apache.jackrabbit.oak.plugins.document.persistentCache.PersistentCache$1)
> at
> org.apache.jackrabbit.oak.plugins.document.persistentCache.PersistentCache.switchGenerationIfNeeded(PersistentCache.java:350)
> - locked <0x0000000782455710> (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.DocumentNodeStore.applyChanges(DocumentNodeStore.java:1060)
> at
> org.apache.jackrabbit.oak.plugins.document.Commit.applyToCache(Commit.java:599)
> at
> org.apache.jackrabbit.oak.plugins.document.CommitQueue.afterTrunkCommit(CommitQueue.java:127)
> - locked <0x0000000781890788> (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:637)
> {noformat}
> To avoid blocking the foreground thread, one solution is to store all data in
> a separate thread. If there is too much data added, then some of the data is
> not stored. If possible, the data that was not referenced a lot, and / or old
> revisions of documents (if new revisions are available).
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