[jira] [Updated] (KAFKA-497) recover consumer during unclean leadership change

["Joel Koshy (JIRA)" <ji...@apache.org>]

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

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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