Github user hmcl commented on the issue:
https://github.com/apache/storm/pull/1999
@srdo the changes proposed in this PR handle null tuples in identical
fashion that what is done in the old Kafka Spout as can be seen in the
following links.
https://github.com/apache/storm/blob/master/external/storm-kafka/src/jvm/org/apache/storm/kafka/PartitionManager.java#L197
https://github.com/apache/storm/blob/master/external/storm-kafka/src/jvm/org/apache/storm/kafka/PartitionManager.java#L208-L210
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