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Posted to issues@hbase.apache.org by "Gary Helmling (JIRA)" <ji...@apache.org> on 2011/04/13 07:45:05 UTC
[jira] [Resolved] (HBASE-3759) Eliminate use of ThreadLocals for
CoprocessorEnvironment bypass() and complete()
[ https://issues.apache.org/jira/browse/HBASE-3759?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gary Helmling resolved HBASE-3759.
----------------------------------
Resolution: Fixed
Fix Version/s: 0.92.0
Hadoop Flags: [Reviewed]
Committed to trunk. Thanks for review Stack!
> Eliminate use of ThreadLocals for CoprocessorEnvironment bypass() and complete()
> --------------------------------------------------------------------------------
>
> Key: HBASE-3759
> URL: https://issues.apache.org/jira/browse/HBASE-3759
> Project: HBase
> Issue Type: Improvement
> Components: coprocessors
> Reporter: Gary Helmling
> Assignee: Gary Helmling
> Fix For: 0.92.0
>
> Attachments: HBASE-3759.patch, cp_bypass.tar.gz
>
>
> In the current coprocessor framework, ThreadLocal objects are used for the bypass and complete booleans in CoprocessorEnvironment. This allows the *CoprocessorHost implementations to identify when to short-circuit processing the the preXXX and postXXX hook methods.
> Profiling the region server, however, shows that these ThreadLocals can become a contention point when on a hot code path (such as prePut()). We should refactor the CoprocessorHost pre/post implementations to remove usage of the ThreadLocal variables and replace them with locally scoped variables to eliminate contention between handler threads.
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