Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/15375
Odd, this is the error from appveyor:
```
ontext: Fail to set Spark caller context
java.lang.ClassNotFoundException: org.apache.hadoop.ipc.CallerContext
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at
org.apache.spark.util.CallerContext.setCurrentContext(Utils.scala:2485)
at org.apache.spark.scheduler.Task.run(Task.scala:96)
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:282)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
16/10/07 03:45:58 INFO Executor: Finished task 1.
```
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