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https://issues.apache.org/jira/browse/HADOOP-2274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12545825
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Hudson commented on HADOOP-2274:
--------------------------------
Integrated in Hadoop-Nightly #315 (See
[http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Nightly/315/])
> [hbase] Excess synchronization introduced by HADOOP-2139 negatively impacts
> performance
> ---------------------------------------------------------------------------------------
>
> Key: HADOOP-2274
> URL: https://issues.apache.org/jira/browse/HADOOP-2274
> Project: Hadoop
> Issue Type: Bug
> Components: contrib/hbase
> Affects Versions: 0.16.0
> Reporter: Jim Kellerman
> Assignee: Jim Kellerman
> Fix For: 0.16.0
>
> Attachments: patch.txt
>
>
> Phase 2 of HADOOP-2139 introduced more widely scoped synchronization to
> prevent the concurrent modification exceptions reported in HADOOP-2163. This
> has negatively impacted performance. Investigate synchronization and
> determine if it can be accomplished at a more fine grained level.
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