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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5897) prePut coprocessor hook causing substantial CPU usage
Date Wed, 02 May 2012 06:05:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13266373#comment-13266373
] 

Hudson commented on HBASE-5897:
-------------------------------

Integrated in HBase-TRUNK-security #189 (See [https://builds.apache.org/job/HBase-TRUNK-security/189/])
    HBASE-5897 prePut coprocessor hook causing substantial CPU usage (Revision 1332811)

     Result = SUCCESS
larsh : 
Files : 
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java

                
> 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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