Github user srdo commented on the issue:
https://github.com/apache/storm/pull/1999
@hmcl Googled it, it appears that null messages can be sent to delete
messages in Kafka (see
https://kafka.apache.org/documentation/#design_compactionbasics). It makes
sense to drop messages quietly if their values are null.
It's good to be able to automatically drop them if the RecordTranslator
returns null as well, I'm mostly worried that bugs in RecordTranslator
implementations could be hidden by the null drop being enabled by default. It's
more of a nitpick though.
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