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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10047) postScannerFilterRow consumes a lot of CPU in tall table scans
Date Sun, 22 Dec 2013 05:25:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13855100#comment-13855100
] 

Andrew Purtell commented on HBASE-10047:
----------------------------------------

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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