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https://issues.apache.org/jira/browse/ZOOKEEPER-790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12892478#action_12892478
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Vishal K commented on ZOOKEEPER-790:
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Hi Flavio,
Apologies for not trying the patch sooner. I will try out the patch soon
(altough Sergey has pointed out a potential problem).
I am still not conviced why the other two nodes that have formed the cluster
are in LOOKING state?
You mentioned that - "The notifications of 1 and 2 say looking because they
have been queued at the time 1 and 2 were looking for a leader. That's not an
issue".
However, in this case, we have failed a follower and not a leader. Why would
failure of a follower cause the other two nodes (including the leader) to start
looking for a leader?
Am I missing something?
Thanks.
-Vishal
> Last processed zxid set prematurely while establishing leadership
> -----------------------------------------------------------------
>
> Key: ZOOKEEPER-790
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-790
> Project: Zookeeper
> Issue Type: Bug
> Components: quorum
> Affects Versions: 3.3.1
> Reporter: Flavio Junqueira
> Assignee: Flavio Junqueira
> Priority: Blocker
> Fix For: 3.3.2, 3.4.0
>
> Attachments: ZOOKEEPER-790-3.3.patch, ZOOKEEPER-790-3.3.patch,
> ZOOKEEPER-790-follower-request-NPE.log, ZOOKEEPER-790.patch,
> ZOOKEEPER-790.patch, ZOOKEEPER-790.patch, ZOOKEEPER-790.patch,
> ZOOKEEPER-790.patch, ZOOKEEPER-790.travis.log.bz2
>
>
> The leader code is setting the last processed zxid to the first of the new
> epoch even before connecting to a quorum of followers. Because the leader
> code sets this value before connecting to a quorum of followers
> (Leader.java:281) and the follower code throws an IOException
> (Follower.java:73) if the leader epoch is smaller, we have that when the
> false leader drops leadership and becomes a follower, it finds a smaller
> epoch and kills itself.
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