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https://issues.apache.org/jira/browse/KAFKA-10527?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Gustafson resolved KAFKA-10527.
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Resolution: Fixed
> Voters should always initialize as followers
> --------------------------------------------
>
> Key: KAFKA-10527
> URL: https://issues.apache.org/jira/browse/KAFKA-10527
> Project: Kafka
> Issue Type: Sub-task
> Reporter: Jason Gustafson
> Assignee: Jason Gustafson
> Priority: Major
>
> The current state initialization logic preserves whatever state the broker
> was in when it was shutdown. In particular, if the node was previously a
> leader, it will remain a leader. This can be dangerous if we want to consider
> optimizations such as in KAFKA-10526 since the leader might lose unflushed
> data following the restart. It would be safer to always initialize as a
> follower so that a leader's tenure never crosses process restarts. This helps
> to guarantee the uniqueness of the (offset, epoch) tuple which the
> replication protocol depends on.
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