Github user tillrohrmann commented on the issue:
https://github.com/apache/flink/pull/2257
I think by imposing this contract we actually introduced problems we didn't
have before. Thus, in order to remedy these problems for the upcoming release
and go back a bit in the direction of the pre-RM age, I loosened the contract
of the RM so that it can no longer reject TM registrations. This makes sense in
my opinion, since we don't have a mean to shut down orphaned TMs anyway.
So in this version, the RM's task is to ensure that at least a predefined
set of resources is allocated and to notify the JM about a TM death (not
strictly mandatory).
What we could actually do is to also register orphaned TMs (or ones
registered by a different RM). Then we wouldn't have the problem that we
allocate too many resources for a JM.
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