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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4367) Deadlock in MemStore flusher due to JDK internally synchronizing on current thread
Date Mon, 12 Sep 2011 07:39:08 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13102486#comment-13102486
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ramkrishna.s.vasudevan commented on HBASE-4367:
-----------------------------------------------

HBASE-4101 does the same thing of removing the Date object.  Perhaps could have found all
similar cases and arrived at the solution.

> Deadlock in MemStore flusher due to JDK internally synchronizing on current thread
> ----------------------------------------------------------------------------------
>
>                 Key: HBASE-4367
>                 URL: https://issues.apache.org/jira/browse/HBASE-4367
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.90.4
>            Reporter: Todd Lipcon
>            Assignee: Ted Yu
>            Priority: Critical
>             Fix For: 0.92.0
>
>         Attachments: 4367.txt
>
>
> We observed a deadlock in production between the following threads:
> - IPC handler thread holding the monitor lock on MemStoreFlusher inside reclaimMemStoreMemory,
waiting to obtain MemStoreFlusher.lock (the reentrant lock member)
> - cacheFlusher thread inside flushRegion holds MemStoreFlusher.lock, and then calls PriorityCompactionQueue.add,
which calls PriorityCompactionQueue.addToRegionsInQueue, which calls CompactionRequest.toString(),
which calls Date.toString. If this occurs just after a GC under memory pressure, Date.toString
needs to reload locale information (stored in a soft reference), so it calls ResourceBundle.loadBundle,
which uses Thread.currentThread() as a synchronizer (see sun bug http://bugs.sun.com/view_bug.do?bug_id=6915621).
Since the current thread is the MemStoreFlusher itself, we have a lock order inversion and
a deadlock.

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