[jira] [Created] (ZOOKEEPER-2988) NPE triggered if server receives a vote for a server id not in their voting view

["Brian Nixon (JIRA)" <ji...@apache.org>]

Brian Nixon created ZOOKEEPER-2988:
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             Summary: NPE triggered if server receives a vote for a server id not in their voting view
                 Key: ZOOKEEPER-2988
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2988
             Project: ZooKeeper
          Issue Type: Bug
          Components: leaderElection
    Affects Versions: 3.4.11, 3.5.3
            Reporter: Brian Nixon


We've observed the following behavior in elections when a node is lagging behind the quorum in its view of the ensemble topology.

- Node A is operating with node B in its voting view, but without view of node C.

- B votes for C.

- A then switches its vote to C, but throws a NPE when attempting to connect.

This causes the QuorumPeer to spin up a Follower only to immediately have it shutdown by the exception.

Ideally, A would not advertise a vote for a server that it will not follow.



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