[jira] [Commented] (HBASE-10047) postScannerFilterRow consumes a lot of CPU in tall table scans

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

    [ https://issues.apache.org/jira/browse/HBASE-10047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13852663#comment-13852663 ] 

Lars Hofhansl commented on HBASE-10047:
---------------------------------------

Trying with Phoenix I do see a 5-10% improvement when doing a count(1) on a tall table (1 col).
Scanning the same (1 col) table with the HBase client using a Filter to filter all data at the server I see 25% scan improvement with patch.

The question is whether the extra complexity in the code is worth it. [~apurtell], any opinion?


> 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-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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