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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14489) postScannerFilterRow consumes a lot of CPU
Date Fri, 25 Sep 2015 04:59:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14907576#comment-14907576
] 

Lars Hofhansl commented on HBASE-14489:
---------------------------------------

Hmm... Also see HBASE-10047 where I filed the same thing, even with a patch. I am reviving
the patch here.

> postScannerFilterRow consumes a lot of CPU
> ------------------------------------------
>
>                 Key: HBASE-14489
>                 URL: https://issues.apache.org/jira/browse/HBASE-14489
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>              Labels: performance
>
> During an unrelated test I found that when scanning a tall table with CQ only and filtering
most results at the server, 50%(!) of time is spend in postScannerFilterRow, even though the
coprocessor does nothing in that hook.
> We need to find a way not to call this hook when not needed, or to question why we have
this hook at all.
> I think [~ram_krish] added the hook (or maybe [~anoop.hbase]). I am also not sure whether
Phoenix uses this hook ([~giacomotaylor]?)



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