Github user srowen commented on the issue:
https://github.com/apache/spark/pull/18805
Hm, this might be a real error. It seems to be hanging at:
```
[info] ExternalAppendOnlyMapSuite:
...
[info] - simple cogroup (56 milliseconds)
[info] - spilling (3 seconds, 678 milliseconds)
9/21/17 1:43:14 AM
=============================================================
-- Gauges
----------------------------------------------------------------------
master.aliveWorkers
9/21/17 2:03:14 AM
=============================================================
-- Gauges
----------------------------------------------------------------------
master.aliveWorkers
9/21/17 2:23:14 AM
=============================================================
...
```
However I can't figure out how that would be related. This new codec isn't
enabled anywhere except its test. Hm, I can run it again tomorrow in case it
something else transient, but it did fail this way twice and nothing else did.
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