[jira] Commented: (ZOOKEEPER-484) Clients get SESSION MOVED exception when switching from follower to a leader.

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12739588#action_12739588 ] 

Hadoop QA commented on ZOOKEEPER-484:
-------------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12415556/ZOOKEEPER-484.patch
  against trunk revision 800990.

    +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 findbugs.  The patch does not introduce any new Findbugs warnings.

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

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

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

Test results: http://hudson.zones.apache.org/hudson/job/Zookeeper-Patch-vesta.apache.org/167/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Zookeeper-Patch-vesta.apache.org/167/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: http://hudson.zones.apache.org/hudson/job/Zookeeper-Patch-vesta.apache.org/167/console

This message is automatically generated.

> Clients get SESSION MOVED exception when switching from follower to a leader.
> -----------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-484
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-484
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.2.0
>            Reporter: Mahadev konar
>            Assignee: Mahadev konar
>            Priority: Blocker
>             Fix For: 3.2.1, 3.3.0
>
>         Attachments: sessionTest.patch, ZOOKEEPER-484.patch
>
>
> When a client is connected to follower and get disconnected and connects to a leader it gets SESSION MOVED excpetion. This is beacuse of a bug in the new feature of ZOOKEEPER-417 that we added in 3.2. All the releases before 3.2 DO NOT have this problem. The fix is to make sure the ownership of a connection gets changed when a session moves from follower to the leader. The workaround to it in 3.2.0 would be to swithc off connection from clients to the leader. take a look at *leaderServers* java property in http://hadoop.apache.org/zookeeper/docs/r3.2.0/zookeeperAdmin.html.

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