[jira] [Resolved] (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:all-tabpanel ]

Lars Hofhansl resolved HBASE-14489.
-----------------------------------
      Resolution: Fixed
    Hadoop Flags: Reviewed

> 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
>            Assignee: Lars Hofhansl
>              Labels: performance
>             Fix For: 2.0.0, 1.2.0, 1.3.0, 0.98.15, 1.0.3, 1.1.3
>
>         Attachments: 14489-0.98.txt, 14489-master.txt
>
>
> 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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