Github user KurtYoung commented on the issue:
https://github.com/apache/flink/pull/2571
@mxm Regarding the last heartbeat thing, what i really trying to say is,
the failing free request will not stuck in the unconfirmed list forever, since
we have the heartbeat manager to monitoring the network connection between RM
and TM. If the network is really broker, they will treat each other as dead and
take some corresponding actions.
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