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https://issues.apache.org/jira/browse/KAFKA-1537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14069607#comment-14069607
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Jiang Wu commented on KAFKA-1537:
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I agree that adding acks=-2 to require acks from all replicas is not necessary;
mainly because users can do so by setting acks=num_of_replicas.
> add request.required.acks=-2 to require acks from all replicas
> --------------------------------------------------------------
>
> Key: KAFKA-1537
> URL: https://issues.apache.org/jira/browse/KAFKA-1537
> Project: Kafka
> Issue Type: Improvement
> Components: core
> Affects Versions: 0.8.1.1
> Reporter: Jiang Wu
> Priority: Minor
>
> The current options for the producer parameter request.required.acks include
> 0, positive numbers and -1. -1 means the acks from replicas in ISR.
> In a stress test, it's found that, if request.required.acks=-1 and the leader
> is receiving at high speed, then the followers will fail out of ISR. In this
> case, request.required.acks=-1 is equivelant to request.required.acks=1
> because only the leader is in ISR.
> It would be desirable to add request.required.acks=-2 to require acks from
> all replicas.
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