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https://issues.apache.org/jira/browse/ZOOKEEPER-1209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13120838#comment-13120838
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Hadoop QA commented on ZOOKEEPER-1209:
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+1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12497779/ZOOKEEPER-1209.patch
against trunk revision 1177432.
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 3 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 (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 passed core unit tests.
+1 contrib tests. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-ZOOKEEPER-Build/604//testReport/
Findbugs warnings:
https://builds.apache.org/job/PreCommit-ZOOKEEPER-Build/604//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output:
https://builds.apache.org/job/PreCommit-ZOOKEEPER-Build/604//console
This message is automatically generated.
> LeaderElection recipe doesn't handle the split-brain issue, n/w disconnection
> can bring both the client nodes to be in ELECTED
> ------------------------------------------------------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-1209
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1209
> Project: ZooKeeper
> Issue Type: Bug
> Components: recipes
> Affects Versions: 3.3.3
> Reporter: Rakesh R
> Assignee: Rakesh R
> Attachments: ZOOKEEPER-1209.patch
>
>
> *Case1-* N/w disconnection can bring both the client nodes to be in ELECTED
> state. Current LeaderElectionSupport(LES) f/w handles only 'NodeDeletion'.
>
> Consider the scenario where ELECTED and READY nodes are running. Say ELECTED
> node's n/w got failed and is "Disconnected" from ZooKeeper. But it will
> behave as ELECTED as it is not getting any events from the
> LeaderElectionSupport(LES) framework.
> After sessiontimeout, node in READY state will be notified by 'NodeDeleted'
> event and will go to ELECTED state.
> *Problem:*
> Both the node becomes ELECTED and finally the user sees two Master (ELECTED)
> node and cause inconsistencies.
> *Case2-* Also in this case, Let's say if user has started only one client
> node and becomes ELECTED. After sometime n/w has disconnected with the
> ZooKeeper server and the session got expired.
> *Problem:*
> Still the client node will be in the ELECTED state. After sometime if user
> has started the second client node. Again both the nodes becomes ELECTED.
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