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https://issues.apache.org/jira/browse/HBASE-3759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13017821#comment-13017821
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Andrew Purtell commented on HBASE-3759:
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+1
> 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
> Attachments: 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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