StefanRRichter edited a comment on issue #8431: [FLINK-12480] Introduce mailbox to StreamTask main-loop URL: https://github.com/apache/flink/pull/8431#issuecomment-492336130 Maybe to extend the explanation a bit, the `MailboxSender` interface is in function similar to the `Executor` interface. Just we want a bit more control over when letters are accepted in the queue.
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