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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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Jun Rao resolved KAFKA-497.
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Resolution: Fixed
With KAFKA-506, this is no longer an issue. Since offsets are logical, the
consumer can never see a partial message. During unclean leader election, a
small number of messages may not match among replicas. So, it's possible for a
consumer to see a different message on the same offset at different point of
time. However, this is ok since during unclean leader election, there is no
guarantee that all data is protected.
> 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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