Github user liancheng commented on the pull request: https://github.com/apache/spark/pull/12527#issuecomment-212425913 @yhuai This one can probably avoid the deadlock since I worked around it [here][1]. Also check [this comment] for more information. Not sure whether we should merge this one since I haven't figured out whether the deadlock is caused bug(s) in this PR or in `DAGScheduler`. [1]: https://github.com/apache/spark/pull/12527/files#diff-75164dfeac2c1507ae828d2ba5529470R304 [2]: https://github.com/apache/spark/pull/12153#issuecomment-212424785
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