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https://issues.apache.org/jira/browse/HBASE-5897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13265399#comment-13265399
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Lars Hofhansl commented on HBASE-5897:
--------------------------------------
Looking at the code some more... doMiniBactchPut will handle the entire batch
unless it cannot lock the involved rows (see STEP 1. in doMiniBatchPut).
So calling doMiniBatchPut multiple times on behalf of the same Put operation
should be happening relatively rarely.
> 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, 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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