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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-10047) postScannerFilterRow consumes a lot of CPU in tall table scans
Date Mon, 23 Dec 2013 03:35:52 GMT

     [ https://issues.apache.org/jira/browse/HBASE-10047?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl resolved HBASE-10047.
-----------------------------------

    Resolution: Later

Can't measure any meaningful perf enhancement in a real world setup. I might to come back
to this one later.
Might need to look at calling nextRow in RegionScannerImpl anyway.


> 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-poc-v4.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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