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https://issues.apache.org/jira/browse/KAFKA-2176?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Igor Maravić updated KAFKA-2176:
--------------------------------
    Status: Open  (was: Patch Available)

> 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
>
>
> 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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