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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3433) Remove the KV copy of every KV in Scan; introduced by HBASE-3232 (why doesn't keyonlyfilter make copies rather than mutate -- HBASE-3211)?
Date Fri, 11 Nov 2011 06:26:52 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13148297#comment-13148297
] 

Hadoop QA commented on HBASE-3433:
----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12503321/3433-v2.txt
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    -1 javadoc.  The javadoc tool appears to have generated -164 warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    -1 findbugs.  The patch appears to introduce 50 new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed unit tests in .

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/231//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/231//artifact/trunk/patchprocess/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/231//console

This message is automatically generated.
                
> Remove the KV copy of every KV in Scan; introduced by HBASE-3232 (why doesn't keyonlyfilter
make copies rather than mutate -- HBASE-3211)?
> ------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-3433
>                 URL: https://issues.apache.org/jira/browse/HBASE-3433
>             Project: HBase
>          Issue Type: Improvement
>          Components: performance, regionserver
>            Reporter: stack
>            Assignee: Lars Hofhansl
>            Priority: Critical
>             Fix For: 0.94.0
>
>         Attachments: 3433-v2.txt, 3433.txt, HBASE-3433-sidenote.patch
>
>
> Here is offending code from inside in StoreScanner#next:
> {code}
>       // kv is no longer immutable due to KeyOnlyFilter! use copy for safety
>       KeyValue copyKv = new KeyValue(kv.getBuffer(), kv.getOffset(), kv.getLength());
> {code}
> This looks wrong given philosophy up to this has been avoidance of garbage-making copies.
> Maybe this has been looked into before and this is the only thing to be done but why
is KeyOnlyFilter not making copies rather than mutating originals?
> Making this critical against 0.92.

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