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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-14489) postScannerFilterRow consumes a lot of CPU
Date Sat, 26 Sep 2015 23:15:04 GMT

     [ https://issues.apache.org/jira/browse/HBASE-14489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Lars Hofhansl updated HBASE-14489:
    Attachment: 14489-master.txt

Patch for master. Note the signature change for postScannerFilterRow where the deprecated
method could also be implemented. Meh.

> 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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