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https://issues.apache.org/jira/browse/KAFKA-2176?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14539320#comment-14539320
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Gwen Shapira commented on KAFKA-2176:
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Do we want to fix this?
It is not an issue in the new Producer, which MirrorMaker can use.
> DefaultPartitioner doesn't perform consistent hashing based on
> ---------------------------------------------------------------
>
> Key: KAFKA-2176
> URL: https://issues.apache.org/jira/browse/KAFKA-2176
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 0.8.1
> Reporter: Igor Maravić
> Labels: easyfix, newbie
> Fix For: 0.8.1
>
> Attachments: KAFKA-2176.patch
>
>
> While deploying MirrorMakers in production, we configured it to use
> kafka.producer.DefaultPartitioner. By doing this and since we had the same
> amount partitions for the topic in local and aggregation cluster, we expect
> that the messages will be partitioned the same way.
> This wasn't the case. Messages were properly partitioned with
> DefaultPartitioner on our local cluster, since the key was of the type String.
> On the MirrorMaker side, the messages were not properly partitioned.
> Problem is that the Array[Byte] doesn't implement hashCode function, since it
> is mutable collection.
> Fix is to calculate the deep hash code if the key is of Array type.
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