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Posted to issues@hbase.apache.org by "Lars Hofhansl (JIRA)" <ji...@apache.org> on 2013/12/19 05:41:07 UTC

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

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

Lars Hofhansl updated HBASE-10047:
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    Attachment: 10047-0.94-sample.txt

Sample patch. Checks whether any coprocessor actually has its own postScannerFilterRow method. If not the loop can just be short circuited.

As I said above, not sure it's even worth it. Just parking the patch here for now.

> 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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