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

["Steven Aerts (JIRA)" <ji...@apache.org>]

Steven Aerts created SAMZA-762:
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             Summary: 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


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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