Github user tedyu commented on the pull request:
https://github.com/apache/spark/pull/10284#issuecomment-166033110
I think the following exception seen in unit test run was related to this
PR:
```
[info] - Simple replay (70 milliseconds)
java.lang.NullPointerException
at
org.apache.spark.deploy.master.Master$$anonfun$asyncRebuildSparkUI$1.applyOrElse(Master.scala:982)
at
org.apache.spark.deploy.master.Master$$anonfun$asyncRebuildSparkUI$1.applyOrElse(Master.scala:980)
at scala.concurrent.Future$$anonfun$onSuccess$1.apply(Future.scala:117)
at scala.concurrent.Future$$anonfun$onSuccess$1.apply(Future.scala:115)
at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)
at
com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:293)
at
scala.concurrent.impl.ExecutionContextImpl$$anon$1.execute(ExecutionContextImpl.scala:133)
at
scala.concurrent.impl.CallbackRunnable.executeWithValue(Promise.scala:40)
at
scala.concurrent.impl.Promise$DefaultPromise.tryComplete(Promise.scala:248)
at scala.concurrent.Promise$class.complete(Promise.scala:55)
at
scala.concurrent.impl.Promise$DefaultPromise.complete(Promise.scala:153)
at
scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:23)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
```
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