[
https://issues.apache.org/jira/browse/HBASE-8316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13627974#comment-13627974
]
Lars Hofhansl commented on HBASE-8316:
--------------------------------------
Seems like this should be assigned to me.
> JoinedHeap for non essential column families should reseek instead of seek
> --------------------------------------------------------------------------
>
> Key: HBASE-8316
> URL: https://issues.apache.org/jira/browse/HBASE-8316
> Project: HBase
> Issue Type: Sub-task
> Components: Filters, Performance, regionserver
> Reporter: Lars Hofhansl
> Assignee: Ted Yu
> Fix For: 0.98.0, 0.94.7, 0.95.1
>
> Attachments: 8316-0.94.txt, 8316-trunk.txt, 8316-trunk.txt
>
>
> This was raised by the Phoenix team. During a profiling session we noticed
> that catching the joinedHeap up to the current rows via seek causes a
> performance regression, which makes the joinedHeap only efficient when either
> a high or low percentage is matched by the filter.
> (High is fine, because the joinedHeap will not get behind as often and does
> not need to be caught up, low is fine, because the seek isn't happening
> frequently).
> In our tests we found that the solution is quite simple: Replace seek with
> reseek. Patch coming soon.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
