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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