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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 Fri, 20 Dec 2013 18:48:09 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13854409#comment-13854409
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Lars Hofhansl commented on HBASE-10047:
---------------------------------------

Interesting, didn't realize that can happen. After the region is loaded? Ohh, when we detect
an error we remove the coprocessor.
SortedCopyOnWriteSet should have been a hint too :)

The first patch is still valid, since we're only removing after the region was loaded.
I didn't measure any perf improvement with v2 anyway, it seems instanceof is not the issue.


> 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: 10047-0.94-sample-v2.txt, 10047-0.94-sample.txt, 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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