[
https://issues.apache.org/jira/browse/HBASE-3759?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Gary Helmling updated HBASE-3759:
---------------------------------
Attachment: cp_bypass.tar.gz
CPU profiling call trees showing usage by the ThreadLocal bypass/complete
implementation (Call_Tree_tl_*) vs. a locally scoped context object for
bypass/complete (Call_Tree_context_*).
> 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.
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
