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Posted to issues@hbase.apache.org by "Lars Hofhansl (JIRA)" <ji...@apache.org> on 2012/05/01 22:58:51 UTC
[jira] [Resolved] (HBASE-5897) prePut coprocessor hook causing
substantial CPU usage
[ https://issues.apache.org/jira/browse/HBASE-5897?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Lars Hofhansl resolved HBASE-5897.
----------------------------------
Resolution: Fixed
Hadoop Flags: Reviewed
Committed to 0.92, 0.94, and 0.96.
> prePut coprocessor hook causing substantial CPU usage
> -----------------------------------------------------
>
> Key: HBASE-5897
> URL: https://issues.apache.org/jira/browse/HBASE-5897
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.92.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Critical
> Fix For: 0.92.2, 0.94.0, 0.96.0
>
> Attachments: 5897-simple.txt, 5897-v2.txt, 5897-v3-0.92.txt, 5897-v3-0.94.txt, 5897-v3.txt, hbase-5897.txt, testRegionServerCoprocessorExceptionWithRemove.stack
>
>
> I was running an insert workload against trunk under oprofile and saw that a significant portion of CPU usage was going to calling the "prePut" coprocessor hook inside doMiniBatchPut, even though I don't have any coprocessors installed. I ran a million-row insert and collected CPU time spent in the RS after commenting out the preput hook, and found CPU usage reduced by 33%.
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