AHeise commented on issue #9383: [FLINK-13248] [runtime] Adding processing of downstream messages in AsyncWaitOperator's wait loops URL: https://github.com/apache/flink/pull/9383#issuecomment-521938038 > > Implementation wise, it looks like the main (task level) mailbox (`TaskMailboxImpl`) became an implicit delegate of mailbox of operator at index 0. > > Instead, I think, it still could be a proper mailbox that can allow executing any letters. In particular, some timer triggers and checkpoints are operator neutral. They still could progress independently of operators. > > It may require, to adjust this implementation, to also execute letters that are not addressed directly to downstream operators. (It's possible also to place such letters as `Mail` with operator index `MAX_INT`). > > Yes, MAX_INT makes more sense than 0 in any case. That was actually my original intent. After some discussions, we moved it to -1 instead and just treat priority mail with MAX_INT.
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