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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10047) postScannerFilterRow consumes a lot of CPU in tall table scans
Date Wed, 27 Nov 2013 07:06:37 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13833538#comment-13833538
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Lars Hofhansl commented on HBASE-10047:
---------------------------------------

For all but extreme scenarios the improvement from this is within the noise. I might just
close this, especially because I do not see a good way to fix this without loss of functionality.


> postScannerFilterRow consumes a lot of CPU in tall table scans
> --------------------------------------------------------------
>
>                 Key: HBASE-10047
>                 URL: https://issues.apache.org/jira/browse/HBASE-10047
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>         Attachments: postScannerFilterRow.png
>
>
> Continuing my profiling quest, I find that in scanning tall table (and filtering everything
on the server) a quarter of the time is now spent in the postScannerFilterRow coprocessor
hook.



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