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https://issues.apache.org/jira/browse/ZOOKEEPER-1789?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14073088#comment-14073088
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Hudson commented on ZOOKEEPER-1789:
-----------------------------------
SUCCESS: Integrated in ZooKeeper-trunk #2384 (See
[https://builds.apache.org/job/ZooKeeper-trunk/2384/])
ZOOKEEPER-1789. 3.4.x observer causes NPE on 3.5.0 (trunk) participants (Alex
Shraer via phunt) (phunt:
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1612885)
* /zookeeper/trunk/CHANGES.txt
*
/zookeeper/trunk/src/java/main/org/apache/zookeeper/server/quorum/QuorumCnxManager.java
* /zookeeper/trunk/src/java/test/org/apache/zookeeper/test/CnxManagerTest.java
> 3.4.x observer causes NPE on 3.5.0 (trunk) participants
> -------------------------------------------------------
>
> Key: ZOOKEEPER-1789
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1789
> Project: ZooKeeper
> Issue Type: Bug
> Affects Versions: 3.5.0
> Reporter: Raul Gutierrez Segales
> Assignee: Alexander Shraer
> Priority: Critical
> Fix For: 3.5.0
>
> Attachments: ZOOKEEPER-1789.patch, ZOOKEEPER-1789.patch
>
>
> (assigning to Alex because this was introduced by ZOOKEEPER-107, but will
> upload a patch as well.)
> I have a 5 participants cluster running what will be 3.5.0 (i.e.: trunk as of
> today) and an observer running 3.4 (trunk from 3.4 branch). When the observer
> tries to establish a connection to the participants I get:
> {noformat}
> Thread Thread[10.40.78.121:3888,5,main] died java.lang.NullPointerException
> at
> org.apache.zookeeper.server.quorum.QuorumCnxManager.receiveConnection(QuorumCnxManager.java:240)
> at
> org.apache.zookeeper.server.quorum.QuorumCnxManager$Listener.run(QuorumCnxManager.java:552)
> {noformat}
> Looking at QuorumCnxManager.java:240:
> {noformat}
> if (protocolVersion >= 0) { // this is a server id and not a
> protocol version
> sid = protocolVersion;
> electionAddr = self.getVotingView().get(sid).electionAddr;
> } else {
> {noformat}
> and self.getVotingView().get(sid) will be null for Observers. So this block
> should cover that case.
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