[jira] [Commented] (HBASE-14489) postScannerFilterRow consumes a lot of CPU

["Lars Hofhansl (JIRA)" <ji...@apache.org>]

    [ 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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