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https://issues.apache.org/jira/browse/HBASE-10047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13855100#comment-13855100
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Andrew Purtell commented on HBASE-10047:
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What if we only care about our (as framework) worst case here? I think that is
we might encounter a cast exception and error out without limiting the damage
to the bad actor and unloading it. So handle that. But, sure, this is getting
pretty far from where this issue started.
> 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-poc-v3.txt, 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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