Compacted topic cannot accept message without key

Mon, 18 Jul 2016 09:03:59 -0700 

Hi, 
        The server log shows error as belows on broker 0.9.0.
        ERROR [Replica Manager on Broker 0]: Error processing append operation 
on partition [__consumer_offsets,5] (kafka.server.ReplicaManager)
kafka.message.InvalidMessageException: Compacted topic cannot accept message 
without key.

Why does this happen and what’s the solution?

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