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https://issues.apache.org/jira/browse/ZOOKEEPER-790?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Flavio Paiva Junqueira updated ZOOKEEPER-790:
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Attachment: ZOOKEEPER-790.patch
This patch is very simple: it moves two function calls such that a leader only
starts up and sets the the last processed zxid after it has a quorum of
supporters. It also includes a unit test. I had to make a few modifications
here and there to be able to write this test. I tried to minimize changes as
much as possible.
> 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 Paiva Junqueira
> Assignee: Flavio Paiva Junqueira
> Priority: Blocker
> Fix For: 3.3.2, 3.4.0
>
> Attachments: 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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