David Jacot created KAFKA-9498:
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Summary: Topic validation during the creation trigger unnecessary
TopicChange events
Key: KAFKA-9498
URL: https://issues.apache.org/jira/browse/KAFKA-9498
Project: Kafka
Issue Type: Bug
Reporter: David Jacot
Assignee: David Jacot
I have found out that the topic validation logic, which is executed when
CreateTopicPolicy or when validateOnly is set, triggers unnecessary ChangeTopic
events in the controller. In the worst case, it can trigger up to one event per
created topic and leads to overloading the controller.
This happens because the validation logic reads all the topics from ZK using
the method getAllTopicsInCluster provided by the KafkaZKClient. This method
registers a watch every time the topics are read from Zookeeper.
I think that we should make the watch registration optional for this call in
oder to avoid this unwanted behaviour.
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