Peer can't find existing leader
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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
Priority: Critical
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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