hbase-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8316) JoinedHeap for non essential column families should reseek instead of seek
Date Wed, 10 Apr 2013 21:33:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13628283#comment-13628283
] 

Hadoop QA commented on HBASE-8316:
----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12578084/noencode.png
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/5251//console

This message is automatically generated.
                
> 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: Lars Hofhansl
>             Fix For: 0.98.0, 0.94.7, 0.95.1
>
>         Attachments: 8316-0.94.txt, 8316-trunk.txt, 8316-trunk.txt, FDencode.png, noencode.png
>
>
> 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

Mime
View raw message