Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/4611#issuecomment-74414416
I don't think we want to take out this check entirely. This was changed
recently to not just test whether the process can be killed (with `kill -0`) as
a way of testing whether it's even a Spark process, but to further examine the
command line. That stinks if this fails on long command lines.
What about a weaker check like just grepping for `spark` in the command
line? the point here is to not kill a foreign process that happens to have
taken the PID named in a stale Spark PID file.
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