James Cheng created KAFKA-3946:
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Summary: Protocol guide should say that Produce request acks can
only be 0, 1, or -1
Key: KAFKA-3946
URL: https://issues.apache.org/jira/browse/KAFKA-3946
Project: Kafka
Issue Type: Bug
Reporter: James Cheng
Priority: Minor
The protocol guide at http://kafka.apache.org/protocol.html#protocol_messages
says that for Produce requests, acks means:
The number of nodes that should replicate the produce before returning. -1
indicates the full ISR.
This seems to imply that you can specify values of 2,3,4, etc.
It would be clearer if the description was more explicit. It should say that
the only valid values are 0, 1, and -1, per the code at
https://github.com/apache/kafka/blob/trunk/core/src/main/scala/kafka/server/ReplicaManager.scala#L382-L384
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