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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2988) NPE triggered if server receives a vote for a server id not in their voting view
Date Wed, 02 May 2018 04:20:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16460503#comment-16460503
] 

ASF GitHub Bot commented on ZOOKEEPER-2988:
-------------------------------------------

Github user hanm commented on the issue:

    https://github.com/apache/zookeeper/pull/478
  
    @enixon "FollowerResyncConcurrencyTest " is a known flaky test (and the error in this
case is infrastructure issues - the JVM abnormally exit). I tested your patch using a Jenkins
job and everything looks good. Committed, please close this pull request.
    
    >> is there a good way to re-run the test
    
    P.S. to kick off the pre-commit build bot, you can close the pull request and reopen it.


> 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: 3.5.3, 3.4.11
>            Reporter: Brian Nixon
>            Assignee: Brian Nixon
>            Priority: Minor
>             Fix For: 3.5.4, 3.6.0
>
>
> 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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