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