Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/2421#issuecomment-55985869
@WangTaoTheTonic According to the wiki page @vanzin pointed out, values
above 125 are used by bash for special purposes. Since the purpose of this PR
is to reduce the possibility of exit code collision, just choose any value that
is not too common and doesn't violate bash rules, not necessary to be prime :)
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