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From "Flavio Junqueira (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (ZOOKEEPER-917) Leader election selected incorrect leader
Date Thu, 04 Nov 2010 12:41:42 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-917?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Flavio Junqueira resolved ZOOKEEPER-917.
----------------------------------------

    Resolution: Not A Problem

My pleasure to help. I'm marking it as not a problem for now, but feel free to come back and
ask for more clarification if needed.

> Leader election selected incorrect leader
> -----------------------------------------
>
>                 Key: ZOOKEEPER-917
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-917
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: leaderElection, server
>    Affects Versions: 3.2.2
>         Environment: Cloudera distribution of zookeeper (patched to never cache DNS entries)
> Debian lenny
>            Reporter: Alexandre Hardy
>            Priority: Critical
>             Fix For: 3.3.3, 3.4.0
>
>         Attachments: zklogs-20101102144159SAST.tar.gz
>
>
> We had three nodes running zookeeper:
>   * 192.168.130.10
>   * 192.168.130.11
>   * 192.168.130.14
> 192.168.130.11 failed, and was replaced by a new node 192.168.130.13 (automated startup).
The new node had not participated in any zookeeper quorum previously. The node 192.148.130.11
was permanently removed from service and could not contribute to the quorum any further (powered
off).
> DNS entries were updated for the new node to allow all the zookeeper servers to find
the new node.
> The new node 192.168.130.13 was selected as the LEADER, despite the fact that it had
not seen the latest zxid.
> This particular problem has not been verified with later versions of zookeeper, and no
attempt has been made to reproduce this problem as yet.

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