Github user jerryshao commented on the pull request:
https://github.com/apache/spark/pull/2824#issuecomment-59469537
I think if bug is occurred when running job, even if we do not throw an
exception here, we will still meet other exceptions in reduce side, so I use
`assert` here. I think an undocumented config is a good idea, but since we need
SparkConf object to pass it, some other code path which use `copyStream` also
need to change.
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