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https://issues.apache.org/jira/browse/KAFKA-340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13437978#comment-13437978
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Jun Rao commented on KAFKA-340:
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For this to happen, each broker needs to know the # of replicas in a partition.
We can change the leaderAndISRRequest to pass this information from the
controller to the broker.
> ensure ISR has enough brokers during clean shutdown of a broker
> ---------------------------------------------------------------
>
> Key: KAFKA-340
> URL: https://issues.apache.org/jira/browse/KAFKA-340
> Project: Kafka
> Issue Type: Sub-task
> Components: core
> Affects Versions: 0.8
> Reporter: Jun Rao
> Labels: optimization
>
> If we are shutting down a broker when the ISR of a partition includes only
> that broker, we could lose some messages that have been previously committed.
> For clean shutdown, we need to guarantee that there is at least 1 other
> broker in ISR after the broker is shut down.
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