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https://issues.apache.org/jira/browse/ZOOKEEPER-157?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Flavio Paiva Junqueira updated ZOOKEEPER-157:
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Resolution: Fixed
Status: Resolved (was: Patch Available)
Thanks, Ben, for reviewing it so fast!
Thanks, Stu, for you feedback! I'll open a jira for the cpu issue you pointed
out.
> Peer can't find existing leader
> -------------------------------
>
> Key: ZOOKEEPER-157
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-157
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Flavio Paiva Junqueira
> Assignee: Flavio Paiva Junqueira
> Priority: Critical
> Attachments: dead-follower.tar.gz, ZOOKEEPER-157.patch
>
>
> In the patch of JIRA 127, I forgot to set the state of a peer when this peer
> is looking for a leader and it receives a message from the current leader. In
> this patch, I have fixed this problem, and also returned to what we had
> previously. With this current patch, when a peer joins and there is already a
> leader elected, the joining peer will only recognize the new leader as the
> leader once it receives a confirmation from a majority. The alternative is to
> set the leader once we receive a message from a peer claiming to be the
> leader (what we have on trunk now, although broken because we don't set the
> state of the peer), but there could be cases in which a peer believes to be
> leader, although it is not the leader any longer, and the joining peer would
> select this false leader to be its leader. Eventually, the false leader would
> timeout, and both processes would select the correct leader. This small fix
> gets rid of such problems, though.
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