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https://issues.apache.org/jira/browse/HBASE-10047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13855097#comment-13855097
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Lars Hofhansl commented on HBASE-10047:
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Just occurred to me, even the first patch is not accurate if somebody has
Coprocessor derived from a custom base class, where the base class implements
the hook.
> 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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