Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/5130#issuecomment-84871675
> Last, what if we run into an OutOfMemoryError on a separate thread?
Since AM does not set `SparkUncaughtExceptionHandler`, it will print
`OutOfMemoryError` to syserr if the driver does not set
UncaughtExceptionHandler for this thread. I think it may hang Spark's other
threads. See #5004 for an example.
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