AcceptedEpoch not updated at leader before it proposes the epoch to followers
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Key: ZOOKEEPER-1291
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1291
Project: ZooKeeper
Issue Type: Bug
Components: server
Affects Versions: 3.4.0
Reporter: Alexander Shraer
Assignee: Alexander Shraer
Fix For: 3.4.0
It is possible that a leader proposes an epoch e and a follower adopts it by
setting acceptedEpoch to e but the leader itself hasn't yet done so.
While I'm not sure this contradicts Zab (there is no description of where the
leader actually sets its acceptedEpoch), it is very counter intuitive.
The fix is to set acceptedEpoch in getEpochToPropose, i.e., before anyone
LearnerHandler passes the getEpochToPropose barrier.
The fix is done as part of ZK-1264
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