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https://issues.apache.org/jira/browse/KAFKA-763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13582415#comment-13582415
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Guozhang Wang commented on KAFKA-763:
-------------------------------------

Just a quick question: what is an "unclean leader election"?
                
> Add an option to replica from the largest offset during unclean leader 
> election
> -------------------------------------------------------------------------------
>
>                 Key: KAFKA-763
>                 URL: https://issues.apache.org/jira/browse/KAFKA-763
>             Project: Kafka
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 0.8
>            Reporter: Jun Rao
>            Assignee: Jun Rao
>            Priority: Blocker
>         Attachments: kafka-763_v1.patch
>
>
> If there is an unclean leader election, a follower may have an offset out of 
> the range of the leader. Currently, the follower will delete all its data and 
> refetch from the smallest offset of the leader. It would be useful to add an 
> option to let the follower refetch from the largest offset of the leader 
> since refetching from the smallest offset may take some time.

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