Github user tillrohrmann commented on the issue:
https://github.com/apache/flink/pull/2358
Dropping is also a solution. I think this will also happen implicitly if
the mailbox grows too big.
Stashing has the advantage that we try (on a best effort basis) to answer
early requests. That way the rpc calls won't have to time out on the sending
side before being retried or alternative measures are taken. Of course this can
happen if the start up takes too long on the server side. Thus, I would imagine
that this approach is a little bit more responsive wrt early rpcs.
So I don't think that stashing actually hurts.
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