Github user holdenk commented on the pull request:
https://github.com/apache/spark/pull/12557#issuecomment-213150785
LGTM as well (note: from chatting with @jodersky it doesn't depend on the
conditional to check for empty if a second ctrl-c is issued, rather it only
re-register the signal handler after its completed killing all of the jobs and
if another signal is received before then uses the default handler)
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