thomaslee commented on pull request #9111: URL: https://github.com/apache/kafka/pull/9111#issuecomment-669624137
It's somewhat easy to do it accidentally. The scenario I was concerned about looks something like this with auto offset commits disabled: ```java KafkaConsumer<...> consumer = ...; Map<TopicPartition, OffsetAndMetadata> offsets = new HashMap<>(); // // in a message processing loop // consumer.commitAsync(offsets); offsets = new HashMap<>(); // // before a rebalance (e.g. onPartitionsRevoked) // consumer.commitSync(offsets); ``` Per the docs the `commitSync` call should ensure that the async commit finishes prior to the rebalance, but it may not if `offsets` is empty here. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
