AHeise edited a comment on issue #9717: [FLINK-14044] [runtime] Reducing synchronization in AsyncWaitOperator URL: https://github.com/apache/flink/pull/9717#issuecomment-534530423 After discussion with @1u0 , I changed how elements are emitted. Previously: whenever n elements are completed in the correct order, `outputCompletedElements` emits all of them. That may have blocked the mailbox thread unnecessarily if the output is full. A checkpoint event would have been only processed once all elements are handled by the `Collector`. Now: We emit only one element in `outputCompletedElements` to keep latency low. Whenever, there are more elements available, directly enqueue a new mail to the mailbox. Checkpointing mails can now interleave the emission of records. Future: if we have non-blocking output, we could emit as many as currently fit in the buffer in the same letter.
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