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From "Charity Majors (JIRA)" <j...@apache.org>
Subject [jira] Commented: (ZOOKEEPER-335) zookeeper servers should commit the new leader txn to their logs.
Date Thu, 03 Jun 2010 00:31:57 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12874888#action_12874888

Charity Majors commented on ZOOKEEPER-335:

I ran into this bug this morning, but it also seemed to put my cluster into an unusable state.
 The cluster stopped accepting all connections, until I restarted node one.  After node one
departed the cluster, nodes two and three formed a quorum and started serving again.  Node
one was unable to rejoin, and had this error:

2010-06-02 17:04:56,486 - FATAL [QuorumPeer:/0:0:0:0:0:0:0:0:2181:Follower@71] - Leader epoch
a is less than our epoch b
2010-06-02 17:04:56,486 - WARN  [QuorumPeer:/0:0:0:0:0:0:0:0:2181:Follower@82] - Exception
when following the leader
java.io.IOException: Error: Epoch of leader is lower

until I cleared the data directory and restarted again.

> zookeeper servers should commit the new leader txn to their logs.
> -----------------------------------------------------------------
>                 Key: ZOOKEEPER-335
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-335
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.1.0
>            Reporter: Mahadev konar
>            Assignee: Mahadev konar
>            Priority: Blocker
>             Fix For: 3.4.0
> currently the zookeeper followers do not commit the new leader election. This will cause
problems in a failure scenarios with a follower acking to the same leader txn id twice, which
might be two different intermittent leaders and allowing them to propose two different txn's
of the same zxid.

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