Hello, Does the KafkaConsumer subscribe methods allow for incremental topic subscriptions?
By incremental I mean that only the added and removed topics and subscribed/unsubscribes respectively and the other topics are not unsubscribed and subscribed back. >From the javadoc API on the subscribe method with a list of topics <https://kafka.apache.org/0110/javadoc/org/apache/kafka/clients/consumer/KafkaConsumer.html#subscribe(java.util.Collection,%20org.apache.kafka.clients.consumer.ConsumerRebalanceListener)>, it is mentioned that topic subscription is not incremental. Does the same apply for pattern-based subscriptions <https://kafka.apache.org/0110/javadoc/org/apache/kafka/clients/consumer/KafkaConsumer.html#subscribe(java.util.regex.Pattern,%20org.apache.kafka.clients.consumer.ConsumerRebalanceListener)> ? As an example, take the following scenario: Step 1: consumer.subscribe(list("A","B","C")) // Now we subscribe to topic D and no longer care about C Step 2: consumer.subscribe(list("A","B","D")) What happens in this scenario with pattern-based subscription? Are all topics from Step 1 unsubscribed and then all Step 2 topics are subscribed? Thank you and best regards, Pedro Cardoso Research Data Engineer pedro.card...@feedzai.com [image: Follow Feedzai on Facebook.] <https://www.facebook.com/Feedzai/>[image: Follow Feedzai on Twitter!] <https://twitter.com/feedzai>[image: Connect with Feedzai on LinkedIn!] <https://www.linkedin.com/company/feedzai/> <https://feedzai.com/>[image: Feedzai in Forbes Fintech 50!] <https://www.forbes.com/fintech/list/> -- The content of this email is confidential and intended for the recipient specified in message only. It is strictly prohibited to share any part of this message with any third party, without a written consent of the sender. If you received this message by mistake, please reply to this message and follow with its deletion, so that we can ensure such a mistake does not occur in the future.
