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https://issues.apache.org/jira/browse/KAFKA-977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14151130#comment-14151130
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Jun Rao commented on KAFKA-977:
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Sriram,
There has been some discussion related to this in KAFKA-1211 as well. Yes, by
using the leader generations per partition, we can (1) make sure replicas are
consistent after unclean leader election; (2) make sure there is no data loss
in the corner case discussed in KAFKA-1211 (i.e., another leader failure
happens just after the follower has truncated the log, but before it has
re-replicated existing committed data from the leader). The change potentially
requires wire protocol and on-disk format change though. So, we need to think
through how to do that in a backward compatible way.
> Implement generation/term per leader to reconcile messages correctly
> --------------------------------------------------------------------
>
> Key: KAFKA-977
> URL: https://issues.apache.org/jira/browse/KAFKA-977
> Project: Kafka
> Issue Type: Bug
> Reporter: Sriram Subramanian
> Assignee: Sriram Subramanian
>
> During unclean leader election, the log messages can diverge and when the
> followers come back up Kafka does not reconcile correctly. To implement it
> correctly, we need to add a term/generation to each message and use that to
> reconcile.
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