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https://issues.apache.org/jira/browse/KAFKA-497?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joel Koshy updated KAFKA-497:
-----------------------------

    Priority: Blocker  (was: Major)
    
> recover consumer during unclean leadership change
> -------------------------------------------------
>
>                 Key: KAFKA-497
>                 URL: https://issues.apache.org/jira/browse/KAFKA-497
>             Project: Kafka
>          Issue Type: Bug
>          Components: core
>            Reporter: Jun Rao
>            Priority: Blocker
>              Labels: bugs
>             Fix For: 0.8
>
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> When we do an unclean leadership change (i.e., no live broker in ISR), 
> offsets already exposed to consumers may no longer be valid. As a result, a 
> consumer could either receive an OffsetOutOfRange exception or hit an 
> InvalidMessageSizeException while iterating a fetched message set. In either 
> case, we need to be able to recover the consumption (probably from the 
> current latest offset from the leader). We need to recover both regular and 
> follower consumers.

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