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  1. ZooKeeper
  2. ZOOKEEPER-2988

NPE triggered if server receives a vote for a server id not in their voting view

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Details

    • Bug
    • Status: Closed
    • Minor
    • Resolution: Fixed
    • 3.5.3, 3.4.11, 3.4.12
    • 3.5.4, 3.6.0, 3.4.13
    • leaderElection
    • None

    Description

      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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            enixon Brian Nixon
            enixon Brian Nixon
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              Created:
              Updated:
              Resolved: