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Date: Sat, 20 Oct 2012 05:16:11 +0000 (UTC)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-6977) Multithread processing ZK
 assignment events
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    [ https://issues.apache.org/jira/browse/HBASE-6977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13480649#comment-13480649 ] 

Hadoop QA commented on HBASE-6977:
----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12550131/trunk-6977_v1.patch
  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:green}+1 hadoop2.0{color}.  The patch compiles against the hadoop 2.0 profile.

    {color:red}-1 javadoc{color}.  The javadoc tool appears to have generated 82 warning messages.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of javac compiler warnings.

    {color:red}-1 findbugs{color}.  The patch appears to introduce 5 new Findbugs (version 1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number of release audit warnings.

     {color:red}-1 core tests{color}.  The patch failed these unit tests:
                       org.apache.hadoop.hbase.coprocessor.TestRegionServerCoprocessorExceptionWithAbort

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/3100//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/3100//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop2-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/3100//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/3100//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop1-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/3100//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/3100//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/3100//console

This message is automatically generated.
                
> Multithread processing ZK assignment events
> -------------------------------------------
>
>                 Key: HBASE-6977
>                 URL: https://issues.apache.org/jira/browse/HBASE-6977
>             Project: HBase
>          Issue Type: Improvement
>          Components: Region Assignment
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>            Priority: Minor
>         Attachments: trunk-6977_v1.patch
>
>
> Related to HBASE-6976 and HBASE-6611.  ZK events processing is a bottle neck for assignments, since there is only one ZK event thread.  If we can use multiple threads, it should be better.
> With multiple threads, the order of events could be messed up. However, if we pass all events related to one region always to the same worker thread, the order should be kept.
> We need to play with it and find out how much performance imrovement we can get.

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