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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2097) Deadlock between HRegion.put and HRegion.close
Date Fri, 08 Jan 2010 23:38:54 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12798253#action_12798253
] 

stack commented on HBASE-2097:
------------------------------

To reproduce -- from J-D -- run in standalone mode (I couldn't repro on cluster).  After reproducing
on first run, after application of this patch, hang hasn't happened after trying sequentialWrite
4 times.

> 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
>            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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