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Date: Mon, 26 Mar 2012 19:46:32 +0000 (UTC)
From: "Hudson (Commented) (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-8212) Improve ActiveStandbyElector's
 behavior when session expires
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    [ https://issues.apache.org/jira/browse/HADOOP-8212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13238732#comment-13238732 ] 

Hudson commented on HADOOP-8212:
--------------------------------

Integrated in Hadoop-Common-0.23-Commit #730 (See [https://builds.apache.org/job/Hadoop-Common-0.23-Commit/730/])
    HADOOP-8212. Improve ActiveStandbyElector's behavior when session expires. Contributed by Todd Lipcon. (Revision 1305509)

     Result = SUCCESS
todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1305509
Files : 
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/ActiveStandbyElector.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ha/ActiveStandbyElectorTestUtil.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ha/TestActiveStandbyElector.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ha/TestActiveStandbyElectorRealZK.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/test/MultithreadedTestUtil.java

                
> Improve ActiveStandbyElector's behavior when session expires
> ------------------------------------------------------------
>
>                 Key: HADOOP-8212
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8212
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 0.23.3, 0.24.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.23.3, 0.24.0
>
>         Attachments: hadoop-8212.txt, hadoop-8212.txt
>
>
> Currently when the ZK session expires, it results in a fatal error being sent to the application callback. This is not the best behavior -- for example, in the case of HA, if ZK goes down, we would like the current state to be maintained, rather than causing either NN to abort. When the ZK clients are able to reconnect, they should sort out the correct leader based on the normal locking schemes.

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