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https://issues.apache.org/jira/browse/HBASE-3322?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Gray updated HBASE-3322:
---------------------------------

    Fix Version/s:     (was: 0.90.0)
                   0.90.1

Punting from 0.90.0 because I have not had sufficient time to research this.  
Planning on doing more work on it this week but until then I don't want to hold 
up 0.90 release since no one else has seen this.

> HLog sync slowdown under heavy load with HBASE-2467
> ---------------------------------------------------
>
>                 Key: HBASE-3322
>                 URL: https://issues.apache.org/jira/browse/HBASE-3322
>             Project: HBase
>          Issue Type: Bug
>          Components: io, regionserver
>    Affects Versions: 0.90.0
>            Reporter: Jonathan Gray
>            Priority: Blocker
>             Fix For: 0.90.1, 0.92.0
>
>
> Testing HBASE-2467 and HDFS-895 on 100 node cluster w/ a heavy increment 
> workload we experienced significant slowdown.
> Stack traces show that most threads are on HLog.updateLock.

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