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From "Davide Giannella (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (OAK-3098) CopyOnWrite might block Async indexer thread indefinitely
Date Thu, 23 Jul 2015 14:09:05 GMT

     [ https://issues.apache.org/jira/browse/OAK-3098?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Davide Giannella closed OAK-3098.
---------------------------------

Bulk closing for 1.3.3.

> CopyOnWrite might block Async indexer thread indefinitely
> ---------------------------------------------------------
>
>                 Key: OAK-3098
>                 URL: https://issues.apache.org/jira/browse/OAK-3098
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: lucene
>            Reporter: Chetan Mehrotra
>            Assignee: Chetan Mehrotra
>            Priority: Minor
>             Fix For: 1.2.3, 1.3.3, 1.0.18
>
>
> CopyOnWrite logic uses a CountDownLatch to sync up on close call. In case of config change
which might lead to closing of the the IndexCopier this latch might not be released causing
the async index thread to hang
> {noformat}
>       sun.misc.Unsafe.park(Native Method)
>       java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
>       java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
>       java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:994)
>       java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1303)
>       java.util.concurrent.CountDownLatch.await(CountDownLatch.java:236)
>       org.apache.jackrabbit.oak.plugins.index.lucene.IndexCopier$CopyOnWriteDirectory.close(IndexCopier.java:648)
>       org.apache.jackrabbit.oak.plugins.index.lucene.LuceneIndexEditorContext.closeWriter(LuceneIndexEditorContext.java:196)
>       org.apache.jackrabbit.oak.plugins.index.lucene.LuceneIndexEditor.leave(LuceneIndexEditor.java:207)
>       org.apache.jackrabbit.oak.plugins.index.IndexUpdate.leave(IndexUpdate.java:219)
>       org.apache.jackrabbit.oak.spi.commit.VisibleEditor.leave(VisibleEditor.java:63)
>       org.apache.jackrabbit.oak.spi.commit.EditorDiff.process(EditorDiff.java:56)
>       org.apache.jackrabbit.oak.plugins.index.AsyncIndexUpdate.updateIndex(AsyncIndexUpdate.java:366)
>       org.apache.jackrabbit.oak.plugins.index.AsyncIndexUpdate.run(AsyncIndexUpdate.java:311)
>       org.apache.sling.commons.scheduler.impl.QuartzJobExecutor.execute(QuartzJobExecutor.java:105)
>       org.quartz.core.JobRunShell.run(JobRunShell.java:207)
>       java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>       java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>       java.lang.Thread.run(Thread.java:745)
> {noformat}
> Ideally this latch should have a timeout or closing logic of IndexCopier ensures that
this is released



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