Github user zentol commented on the issue:
https://github.com/apache/flink/pull/4697
I see a few problems with separating running&completed jobs.
* The monitoring pattern for a job becomes quite weird. While a job is
running you ask "/jobs/running/:jobid", until you get a 404 and then check
"/jobs/completed/:jobid".
* Submitting a job is a POST to "/jobs", which returns
"/jobs/running/:jobid" which may return a 404 if the job fails straight away.
* A unified URL allows us to actually provide good error messages, i.e. a
405 Method not Allowed when trying to take a savepoint for finished jobs. For
separate URLs this would return a 404.
* We have to handle the case of a savepoint/stop request arriving for the
finished job anyway, if the job finishes between accepting the request and
handling it.
Given that it only affects taking savepoints and stopping a job i don't
think it's really necessary to change things. Note that if we were to do that
the job termination should probably be a POST instead.
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