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https://issues.apache.org/jira/browse/ZOOKEEPER-1192?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alexander Shraer updated ZOOKEEPER-1192:
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Attachment: zookeeper-1192.patch
> Leader.waitForEpochAck() checks waitingForNewEpoch instead of checking
> electionFinished
> ---------------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-1192
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1192
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Reporter: Alexander Shraer
> Assignee: Alexander Shraer
> Priority: Critical
> Fix For: 3.4.0
>
> Attachments: zookeeper-1192.patch
>
>
> A follower/leader should block in Leader.waitForEpochAck() until either
> electingFollowers contains a quorum and electionFinished=true or until a
> timeout occurs. A timeout means that a quorum of followers didn't ack the
> epoch on time, which is an error.
> But the check in Leader.waitForEpochAck() is "if (waitingForNewEpoch)
> throw..." and this will never be triggered, even if the wait statement just
> timed out, because Leader.getEpochToPropose() completes and sets
> waitingForNewEpoch to false before Leader.waitForEpochAck() is invoked.
> Instead of "if (waitingForNewEpoch) throw" the condition in
> Leader.waitForEpochAck() should be "if (!electionFinished) throw".
> The guarded block introduced in ZK-1191 should be checking !electionFinished.
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