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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