StefanRRichter commented on issue #8431: [FLINK-12480] Introduce mailbox to StreamTask main-loop URL: https://github.com/apache/flink/pull/8431#issuecomment-492334593 @kezhuw the letters will always be just `Runnable`, and right now there are two cases: checkpoint trigger and processing timers. Stream elements are processed as part of the default action, they don't go through the mailbox for performance reasons. Imagine the default method as the often-called, hot action of the task. The letters are non-frequent request from other threads to run some code for them in the task's main thread to avoid concurrency. Thats all.
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