Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/22114
The tests are failing because they're now using too much direct memory:
```
18/08/17 09:57:35.396 rpc-server-4647-3 WARN TransportChannelHandler:
Exception in connection from /192.168.10.22:36322
io.netty.util.internal.OutOfDirectMemoryError: failed to allocate 16777216
byte(s) of direct memory (used: 2852126720, max: 2863661056)
```
That's the first test in jenkins; the others seem to fail because of
improper cleanup in that first test. But it seems that either we can't just use
direct buffers here, or maybe the test might need some tweaking.
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