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Posted to issues@hbase.apache.org by "Andrew Purtell (JIRA)" <ji...@apache.org> on 2012/04/29 19:51:50 UTC
[jira] [Issue Comment Edited] (HBASE-5897) prePut coprocessor hook
causing substantial CPU usage
[ https://issues.apache.org/jira/browse/HBASE-5897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13264586#comment-13264586 ]
Andrew Purtell edited comment on HBASE-5897 at 4/29/12 5:50 PM:
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+1 on the -simple patch (at least). This looks like a bug that wasn't caught because we didn't have multiput test coverage.
Edit: But we do now, with LoadTestTool.
was (Author: apurtell):
+1 on the -simple patch (at least). This looks like a bug that wasn't caught because we didn't have multiput test coverage.
> 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: 0.94.0, 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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