cricket007 commented on issue #18209: [SPARK-20992][Scheduler] Add support for 
Nomad as a scheduler backend
   > I would recommend to add interfaces in Spark code to abstract out things 
so that plugging in new schedulers would be as simple as adding a jar to the 
classpath. As a matter of fact, we are currently able to use Spark with our own 
scheduler by extending the existing interfaces. The only patching we have to do 
is 3-4 lines which is not super pain during upgrades. Seems like you need more 
than the current interfaces. - @tejasapatil 
   Do these such interfaces exist in Spark at present day? What efforts do you 
know of to make support for such efforts to "be as simple as adding a jar to 
the classpath"?
   I see is still open... 
   > it remains unclear whether the k8s code will be brought in as a 
first-class citizen alongside Mesos and YARN
   Well, looks like it's first class now. Is there historical context one can 
read on how that decision was ultimately made _instead_ of working on the 
plugin interface, as discussed? 

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