Mahadev konar updated ZOOKEEPER-131:

    Attachment: ZOOKEEPER-131.patch

here is a patch that changes e.printstacktrace to log.err.... other than that 
the patch looks good. +1

> Old leader election can elect a dead leader over and over again
> ---------------------------------------------------------------
>                 Key: ZOOKEEPER-131
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-131
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: leaderElection
>            Reporter: Benjamin Reed
>            Assignee: Benjamin Reed
>         Attachments: ZOOKEEPER-131.patch, ZOOKEEPER-131.patch, 
> ZOOKEEPER-131.patch
> I think there is a race condition that is probably easy to get into with the 
> old leader election and a large number of servers:
> 1) Leader dies
> 2) Followers start looking for a new leader before all Followers have 
> abandoned the Leader
> 3) The Followers looking for a new leader see votes of Followers still 
> following the (now dead) Leader and start voting for the dead Leader
> 4) The dead Leader gets reelected.
> For the old leader election a server should not vote for another server that 
> is not nominating himself.

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