Github user s1ck commented on the pull request:
https://github.com/apache/flink/pull/1075#issuecomment-136426216
@tillrohrmann While writing the new tests for both methods, I encountered
that `zipWithIndex` is broken, too. It sometimes throws
`ConcurrentModificationException`. This is because each task sorts a
broadcasted list in the `open` method. This could not fail before due to
parallelism = 1.
I would fix this by creating a local copy of that list (which should be
small in that specific case). Shall I fix this in the same issue or do you want
me to create a new issue for that?
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