Jun Rao created KAFKA-497:
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             Summary: 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
             Fix For: 0.8


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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