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https://issues.apache.org/jira/browse/HBASE-2105?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-2105:
-------------------------

         Priority: Major  (was: Blocker)
    Fix Version/s:     (was: 0.20.4)
                       (was: 0.21.0)

This is not a blocker, after discussion.  Nor is it to be addressed in 0.20.4.  
Moving it out.

> All appends are serialized in HLog
> ----------------------------------
>
>                 Key: HBASE-2105
>                 URL: https://issues.apache.org/jira/browse/HBASE-2105
>             Project: Hadoop HBase
>          Issue Type: Bug
>    Affects Versions: 0.20.2
>            Reporter: Jean-Daniel Cryans
>            Assignee: Jean-Daniel Cryans
>
> duiod on IRC was asking about locks on the write path so I reviewed it a bit 
> and saw that we are very good at not locking except on row level in HRegion 
> and others but in HLog we actually synchronize everything on updateLock. I'm 
> pretty sure that's not what we want. I guess a RWLock would be more useful.

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