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https://issues.apache.org/jira/browse/KAFKA-20097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18056233#comment-18056233
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Shally_Katariya commented on KAFKA-20097:
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I’m actively working on this issue and have changes in progress. A PR will
follow.
> CREATE_TOPIC returns topic information if topic already exists
> --------------------------------------------------------------
>
> Key: KAFKA-20097
> URL: https://issues.apache.org/jira/browse/KAFKA-20097
> Project: Kafka
> Issue Type: Improvement
> Reporter: Jonah Hooper
> Priority: Minor
>
> CREATE_TOPICS request currently checks whether a topic already exists before
> creating one. If a topic with the same name already exists, it will return a
> [TOPIC_ALREADY_EXISTS|https://github.com/apache/kafka/blob/62206cfc5461629818a34723fee7817b369a6f7e/clients/src/main/java/org/apache/kafka/common/protocol/Errors.java#L256]
> error code. No other information in the
> [CreateTopicsResponse|https://github.com/apache/kafka/blob/62206cfc5461629818a34723fee7817b369a6f7e/clients/src/main/resources/common/message/CreateTopicsResponse.json#L42]
> is set if this topic already exists.
> Some clients, may wish to create a topic and then do further work with the
> some information contained within the CreateTopicsResponse. If the client
> does not receive the `CreateTopicsResponse` (for example, do to a network
> disconnect), they may issue another request to create the topics. Since the
> topics already exist, they will receive `TOPIC_ALREADY_EXISTS` and no other
> information about the topic. Hence a further `METADATA_REQUEST` will need to
> be issued to discover the topicId (to be used for other requests).
> To improve convenience, kafka should fill in the
> [CreateableTopicResult|https://github.com/apache/kafka/blob/62206cfc5461629818a34723fee7817b369a6f7e/clients/src/main/resources/common/message/CreateTopicsResponse.json#L42]
> if a topic already exists. Callers then do not need to issue another request
> for metadata. This would make writing clients a bit simpler.
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