Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/7657#issuecomment-125403153
> whether spark.executor.instances is always set if you set --num-executors
It depends on whether it's client or cluster mode. In client mode, this is
used:
OptionAssigner(args.numExecutors, YARN, CLIENT, sysProp =
"spark.executor.instances"),
So the command line arg is turned into a sys prop. In cluster mode, this is
used:
OptionAssigner(args.numExecutors, YARN, CLUSTER, clOption =
"--num-executors"),
So the handling is now in YARN's `ClientArguments.scala`. That can get
tricky to follow in the code.
@neurons I suggest getting rid of "--num-executors" in `ClientArguments`,
and instead using `spark.executor.instances` everywhere, leaving the
translation solely in SparkSubmit (the first line I mention above). That should
also allow some code in `ApplicationMaster` and `ApplicationMasterArguments` to
be cleaned up.
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