Github user sundeepn commented on the pull request:
https://github.com/apache/spark/pull/246#issuecomment-39358127
@kayousterhout The current code iterates thru the the different jobs
sharing the stage and cancels them all. It should handle the scenario of
multiple jobs sharing the stage. Unless ofcourse, the jobs sharing the stage
are interleaved with the 'cancel stage' signal (the race condition). In which
case, the user should either see an exception or will have to cancel the stage
again.
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