[jira] Commented: (ZOOKEEPER-790) Last processed zxid set prematurely while establishing leadership

["Travis Crawford (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12885738#action_12885738 ] 

Travis Crawford commented on ZOOKEEPER-790:
-------------------------------------------

@vishal - How did your test go? I came across this issue while investigating an issue and believe this is the root cause.

If your test went well I can also help test.

> 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
>
>
> 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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