Do not modify ProducerMessage.MetaData #1110
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Nice, thanks! I never considered that the metadata field might actually be useful during the message's lifecycle, instead of just after being returned on errors/successes. |
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In SyncProducer, do not modify ProducerMessage.MetaData during the whole process of publishing the message to Kafka.
MetaData could be used in a user-defined Partitioner. The original design saves the MetaData and reuse the field as a signal channel to wait for completion of publish. It's better to add a non-exeported field for this purpose in the ProducerMessage struct.