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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-5897) prePut coprocessor hook causing substantial CPU usage
Date Tue, 01 May 2012 00:17:53 GMT

     [ https://issues.apache.org/jira/browse/HBASE-5897?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated HBASE-5897:
---------------------------------

    Attachment: 5897-v3.txt

How about this one. Just removes the precondition checks, applies prePut edit edits before
the family edits. And removes an unused variable.
                
> 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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