Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/4776#issuecomment-76103648
Context for other reviewers: removing elements from a mutable HashSet while
iterating over it can cause the iteration to skip over entries that weren't
removed. In this case, this would cause PythonRDD to write fewer than `cnt`
broadcasts, which caused the Python worker to hang while expecting to read
`cnt` total broadcasts.
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