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Date: Wed, 21 Mar 2012 20:16:43 +0000 (UTC)
From: "Hadoop QA (Commented) (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-8163) Improve ActiveStandbyElector to
 provide hooks for fencing old active
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    [ https://issues.apache.org/jira/browse/HADOOP-8163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13234969#comment-13234969 ] 

Hadoop QA commented on HADOOP-8163:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12519297/hadoop-8163.txt
  against trunk revision .

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

    +1 tests included.  The patch appears to include 6 new or modified tests.

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

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

    +1 eclipse:eclipse.  The patch built with eclipse:eclipse.

    +1 findbugs.  The patch does not introduce any 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 failed these unit tests:
                  org.apache.hadoop.ipc.TestRPCCallBenchmark

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

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/740//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/740//console

This message is automatically generated.
                
> Improve ActiveStandbyElector to provide hooks for fencing old active
> --------------------------------------------------------------------
>
>                 Key: HADOOP-8163
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8163
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ha
>    Affects Versions: 0.24.0, 0.23.3
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hadoop-8163.txt, hadoop-8163.txt
>
>
> When a new node becomes active in an HA setup, it may sometimes have to take fencing actions against the node that was formerly active. This JIRA extends the ActiveStandbyElector which adds an extra non-ephemeral node into the ZK directory, which acts as a second copy of the active node's information. Then, if the active loses its ZK session, the next active to be elected may easily locate the unfenced node to take the appropriate actions.

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