Github user nickwallen commented on the issue:
https://github.com/apache/incubator-metron/pull/449
@cestella The core of your idea that really solves the problem that I was
hung up on was adding two "result" expression; one for each destination.
* The HBase destination is just like it is now. I can write any
serializable Java Object.
* The Kafka destination is more limited. Its expression *must* result in a
String. We force the user to serialize the data. And we kind of have to, we
have no good way to embed a serialized object in a JSON message.
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