Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/9243#issuecomment-152628129
@viirya @drcrallen this is a real failure and it's easy to reproduce. It
really stumped me until I figured out why it was just hanging -- it's the call
to `runApproximateJob` with such a short timeout (1ms). It must be some other
subtle problem that causes it to fail to notice the job has already failed
before it begins waiting.
Anyway, if you increase that in the test you can see the problem: `BitSet`
just needs a no-arg constructor with `def this() = this(0)` and you can use
this instead of the call to `new BitSet(0)`.
Also there is still some mention of roaring bitmaps in
`HighlyCompressedMapStatus` comments.
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