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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HBASE-2097) Deadlock between HRegion.put and HRegion.close
Date Sat, 09 Jan 2010 00:27:54 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2097?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jean-Daniel Cryans resolved HBASE-2097.
---------------------------------------

      Resolution: Fixed
        Assignee: stack
    Hadoop Flags: [Reviewed]

I also tried the patch a couple of times and the deadlock is gone. I'm committing the patch
to branch plus I removed some annoying debug (MemStoreScanner) that was also added in HBASE-2037.

> Deadlock between HRegion.put and HRegion.close
> ----------------------------------------------
>
>                 Key: HBASE-2097
>                 URL: https://issues.apache.org/jira/browse/HBASE-2097
>             Project: Hadoop HBase
>          Issue Type: Bug
>            Reporter: Jean-Daniel Cryans
>            Assignee: stack
>            Priority: Blocker
>             Fix For: 0.20.3
>
>         Attachments: 2097.patch
>
>
> HBASE-2037 added a bunch of fixes but also a deadlock:
> HRegion.put:
> {code}
> splitsAndClosesLock.readLock().lock();
> newScannerLock.writeLock().lock();
> {code}
> HRegion.close
> {code}
> newScannerLock.writeLock().lock();
> try {
>   splitsAndClosesLock.writeLock().lock();
> {code}
> To recreate, start a PerformanceEvaluation on standalone and it happens roughly 75% of
the time.

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