Github user hsun-cnnxty commented on the issue:
https://github.com/apache/storm/pull/1591
@satishd nett 4.x has removed auto-flush in write() and it requires user to
explicitly call flush() or writeAndFlush(), so we need to flush for the last
message in the logic flow. Fortunately, the storm netty client does batching
of messages itself and it does not flush for every message.
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