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KIP-431 introduces incompatibility when "print.partition=true" (this argument exist property exists in the code before KIP-431 but not documented). Before KIP-431, "kafka-console-consumer" prints the partition as a number after the value for example: "key1|value1|0". After this KIP, "kafka-console-consumer" prints the partition number prefixed with "Partition:" before the key (if printed) and value, for example: "Partition:0|key1|value1" . Because this property was not documented, no migration plan is implemented in KIP-431.

The other changes are backward compatible because they do not exist before. Apart from "print.partition=true", if a user does not use any new parameters, then the output of console consumer will look the same as before.

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