[jira] [Updated] (HBASE-5897) prePut coprocessor hook causing substantial CPU usage

["Todd Lipcon (JIRA)" <ji...@apache.org>]

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

Todd Lipcon updated HBASE-5897:
-------------------------------

    Attachment: hbase-5897.txt

This patch fixes the CPU usage in my test case.

Would be good if someone more familiar with coprocessors can look at this -- I think this is also fixing a behavioral bug with coprocessors. So if this seems like the correct fix we should also add a regression test for the behavior.
                
> 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
>         Attachments: hbase-5897.txt
>
>
> 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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