majialoong opened a new pull request, #21476: URL: https://github.com/apache/kafka/pull/21476
Previously, `isConsumed` was not volatile and `drain()` set `isConsumed = true` before the `position` was updated. In the window between `drain()` and the `position` update, the background thread could race in, observe **_isConsumed == true but read a stale position_**, leading to duplicate fetch requests with the old offset. This PR declares `isConsumed` as volatile and reorders the operations so that the subscription `position` is always updated before `drain()` sets `isConsumed = true,` ensuring the background thread always sees the `updated position` when it observes `isConsumed == true`. -- 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. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
