[jira] [Commented] (KAFKA-1537) add request.required.acks=-2 to require acks from all replicas

["Jay Kreps (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-1537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14059451#comment-14059451 ] 

Jay Kreps commented on KAFKA-1537:
----------------------------------

Wouldn't it be somewhat odd that you actually want to require N/N replicas to acknowledge? It seems more likely that if you have replication factor 3 you would want 2 acks, which we already support today. Otherwise you have no fault-tolerance.

> 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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