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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2274) [hbase] Excess synchronization introduced by HADOOP-2139 negatively impacts performance
Date Mon, 26 Nov 2007 03:01:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12545319
] 

Hadoop QA commented on HADOOP-2274:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
http://issues.apache.org/jira/secure/attachment/12370167/patch.txt
against trunk revision r597959.

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

    javadoc +1.  The javadoc tool did not generate any warning messages.

    javac +1.  The applied patch does not generate any new compiler warnings.

    findbugs -1.  The patch appears to introduce  new Findbugs warnings.

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

    contrib tests +1.  The patch passed contrib unit tests.

Test results: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1155/testReport/
Findbugs warnings: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1155/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1155/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1155/console

This message is automatically generated.

> [hbase] Excess synchronization introduced by HADOOP-2139 negatively impacts performance
> ---------------------------------------------------------------------------------------
>
>                 Key: HADOOP-2274
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2274
>             Project: Hadoop
>          Issue Type: Bug
>          Components: contrib/hbase
>    Affects Versions: 0.16.0
>            Reporter: Jim Kellerman
>            Assignee: Jim Kellerman
>             Fix For: 0.16.0
>
>         Attachments: patch.txt
>
>
> Phase 2 of HADOOP-2139 introduced more widely scoped synchronization to prevent the concurrent
modification exceptions reported in HADOOP-2163. This has negatively impacted performance.
Investigate synchronization and determine if it can be accomplished at a more fine grained
level.

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