[jira] [Commented] (SAMZA-762) java arrays not usable as keys anymore

["Yi Pan (Data Infrastructure) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SAMZA-762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14940348#comment-14940348 ] 

Yi Pan (Data Infrastructure) commented on SAMZA-762:
----------------------------------------------------

Based on the discussion above, put this one to later.

> java arrays not usable as keys anymore
> --------------------------------------
>
>                 Key: SAMZA-762
>                 URL: https://issues.apache.org/jira/browse/SAMZA-762
>             Project: Samza
>          Issue Type: Bug
>          Components: kafka
>    Affects Versions: 0.9.0
>            Reporter: Steven Aerts
>            Assignee: József Márton Jung
>         Attachments: SAMZA-762.0.patch
>
>
> Since the integration of the new kafka producer into samza, the partitioner is defined like [this|https://github.com/apache/samza/blob/0.9.0/samza-kafka/src/main/scala/org/apache/samza/util/KafkaUtil.scala#L49]:
> {code}
> return abs(envelope.getPartitionKey.hashCode()) % numPartitions
> {code}
> This is problematic for java arrays, as their hash-code is independent of their content (unlike in scala).  So a specific array based key is randomly assigned to a partition.
> In 0.8 it was possible to configure your partitioner with {{systems.kafka.producer.partitioner.class}} and select for example the default murmur2 based partitioner of kafka.
> But this is also not possible anymore.



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