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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5897) prePut coprocessor hook causing substantial CPU usage
Date Tue, 01 May 2012 01:06:54 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13265569#comment-13265569
] 

Hadoop QA commented on HBASE-5897:
----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12525142/5897-v3.txt
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    +1 hadoop23.  The patch compiles against the hadoop 0.23.x profile.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    -1 findbugs.  The patch appears to introduce 1 new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

     -1 core tests.  The patch failed these unit tests:
                       org.apache.hadoop.hbase.master.TestSplitLogManager
                  org.apache.hadoop.hbase.client.TestShell

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/1701//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/1701//artifact/trunk/patchprocess/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/1701//console

This message is automatically generated.
                
> 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.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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