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https://issues.apache.org/jira/browse/KAFKA-1211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15412111#comment-15412111
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Jun Rao commented on KAFKA-1211:
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[~fpj], yes, the idea is to always first write the new LGS before writing any
messages in the new leader generation to the follower's log. So, if the
follower fetches a chunk of messages that cross leader generation. We will have
to split the messages into subsets of the same leader generation. We append
subsets belonging to the current leader generation, update LGS to reflect to
new leader generation, then append subsets belonging to the new leader
generation.
> Hold the produce request with ack > 1 in purgatory until replicas' HW has
> larger than the produce offset
> --------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-1211
> URL: https://issues.apache.org/jira/browse/KAFKA-1211
> Project: Kafka
> Issue Type: Bug
> Reporter: Guozhang Wang
> Assignee: Guozhang Wang
> Fix For: 0.11.0.0
>
>
> Today during leader failover we will have a weakness period when the
> followers truncate their data before fetching from the new leader, i.e.,
> number of in-sync replicas is just 1. If during this time the leader has also
> failed then produce requests with ack >1 that have get responded will still
> be lost. To avoid this scenario we would prefer to hold the produce request
> in purgatory until replica's HW has larger than the offset instead of just
> their end-of-log offsets.
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