Message keys in Kafka are used for grouping alike messages to ensure they're processed on the same partition. They differ from messaging.message_id in that they're not unique. If the key is null, the attribute MUST NOT be set.
Note: If the key type is not string, it's string representation has to be supplied for the attribute. If the key has no unambiguous, canonical string form, don't include its value.
Message keys in Kafka are used for grouping alike messages to ensure they're processed on the same partition. They differ from
messaging.message_idin that they're not unique. If the key isnull, the attribute MUST NOT be set.Note: If the key type is not string, it's string representation has to be supplied for the attribute. If the key has no unambiguous, canonical string form, don't include its value.