Raul Gutierrez Segales created ZOOKEEPER-1789:
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Summary: 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
Reporter: Raul Gutierrez Segales
Assignee: Alexander Shraer
(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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