[ https://issues.apache.org/jira/browse/KAFKA-691?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jun Rao updated KAFKA-691:
--------------------------

    Attachment: kafka-691_extra.patch

Attach the right patch (kafka-691_extra.patch).
                
> Fault tolerance broken with replication factor 1
> ------------------------------------------------
>
>                 Key: KAFKA-691
>                 URL: https://issues.apache.org/jira/browse/KAFKA-691
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 0.8
>            Reporter: Jay Kreps
>            Assignee: Maxime Brugidou
>             Fix For: 0.8
>
>         Attachments: kafka-691_extra.patch, KAFKA-691-v1.patch, KAFKA-691-v2.patch
>
>
> In 0.7 if a partition was down we would just send the message elsewhere. This meant that the partitioning was really more of a "stickiness" then a hard guarantee. This made it impossible to depend on it for partitioned, stateful processing.
> In 0.8 when running with replication this should not be a problem generally as the partitions are now highly available and fail over to other replicas. However in the case of replication factor = 1 no longer really works for most cases as now a dead broker will give errors for that broker.
> I am not sure of the best fix. Intuitively I think this is something that should be handled by the Partitioner interface. However currently the partitioner has no knowledge of which nodes are available. So you could use a random partitioner, but that would keep going back to the down node.

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