[jira] [Created] (KAFKA-20537) Return topic-id in CreateTopicsResponse when topic already exists

[Jonah Hooper (Jira)]

Jonah Hooper created KAFKA-20537:
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             Summary: Return topic-id in CreateTopicsResponse when topic 
already exists
                 Key: KAFKA-20537
                 URL: https://issues.apache.org/jira/browse/KAFKA-20537
             Project: Kafka
          Issue Type: Improvement
            Reporter: Jonah Hooper


If a topic already exists in the CREATE_TOPICS request then we return 
[TOPIC_ALREADY_EXISTS|https://github.com/apache/kafka/blob/3c9b210be3436c0b2086f779ce56db2377ee338e/clients/src/main/java/org/apache/kafka/common/protocol/Errors.java#L256]
 error code. Under this error case the topicId will not be set. Since the 
[topicId|https://github.com/apache/kafka/blob/3c9b210be3436c0b2086f779ce56db2377ee338e/clients/src/main/resources/common/message/CreateTopicsResponse.json#L46]
 does exist if the topic was already created, we should return it as part of 
the RPC. 



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