[jira] [Commented] (RATIS-242) Leader Election not working properly

["Andy Wu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/RATIS-242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16484635#comment-16484635 ] 

Andy Wu commented on RATIS-242:
-------------------------------

RATIS-239 should fix it. 

> Leader Election not working properly
> ------------------------------------
>
>                 Key: RATIS-242
>                 URL: https://issues.apache.org/jira/browse/RATIS-242
>             Project: Ratis
>          Issue Type: Bug
>    Affects Versions: 0.2.0-alpha
>            Reporter: Andy Wu
>            Priority: Major
>             Fix For: 0.2.0-alpha
>
>
> How to produce:
>  1. Assume we have three servers: s0, s1 and s2. We start s0 and s2, and let us randomly pick up a leader, say s0. Assume after leader election, s0 and s2 are in term k.
>  2. Let us start server s1, assume s1 did not received a heartbeat for a while, and it becomes candidate. It proposes a leader election at term 1 since it has not received any heartbeat yet.
>  3. Assume s0 or s2 received the vote request, and RaftServerImpl#requestVote will withholdVotes, so server s0 or s2 will reject the vote request from s1.
>  4. In LeaderElection#waitForResults, s1 will be rejected with a new term. It will change its state as follower with a new term k. Somehow server s1 does not receive any heartbeat update from leader s0, and it will keep retrying leader election again and again.



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