Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3561#issuecomment-66168296
It looks like that failure is due to a (known) flaky Spark Streaming test:
```
[info] CheckpointSuite:
[info] - basic rdd checkpoints + dstream graph checkpoint recovery (17
seconds, 99 milliseconds)
[info] - persistence of conf through checkpoints (1 second, 180
milliseconds)
[info] - recovery with map and reduceByKey operations (7 seconds, 294
milliseconds)
[info] - recovery with invertible reduceByKeyAndWindow operation (9
seconds, 363 milliseconds)
[info] - recovery with saveAsHadoopFiles operation (7 seconds, 299
milliseconds)
[info] - recovery with saveAsNewAPIHadoopFiles operation (7 seconds, 292
milliseconds)
[info] - recovery with updateStateByKey operation (9 seconds, 272
milliseconds)
[info] - recovery with file input stream *** FAILED *** (10 seconds, 283
milliseconds)
[info] List() was empty (CheckpointSuite.scala:336)
[info] org.scalatest.exceptions.TestFailedException:
[info] at
org.scalatest.Assertions$class.newAssertionFailedException(Assertions.scala:500)
[info] at
org.scalatest.FunSuite.newAssertionFailedException(FunSuite.scala:1555)
[info] at
org.scalatest.Assertions$AssertionsHelper.macroAssert(Assertions.scala:466)
[info] at
org.apache.spark.streaming.CheckpointSuite$$anonfun$12.apply$mcV$sp(CheckpointSuite.scala:336)
[info] at
org.apache.spark.streaming.CheckpointSuite$$anonfun$12.apply(CheckpointSuite.scala:282)
[info] at
org.apache.spark.streaming.CheckpointSuite$$anonfun$12.apply(CheckpointSuite.scala:282)
[info] at
org.scalatest.Transformer$$anonfun$apply$1.apply$mcV$sp(Transformer.scala:22)
[info] at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85)
[info] at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
[info] at org.scalatest.Transformer.apply(Transformer.scala:22)
[info] at org.scalatest.Transformer.apply(Transformer.scala:20)
[info] at org.scalatest.FunSuiteLike$$anon$1.apply(FunSuiteLike.scala:166)
[info] at org.scalatest.Suite$class.withFixture(Suite.scala:1122)
[info] at org.scalatest.FunSuite.withFixture(FunSuite.scala:1555)
[...]
```
I could have Jenkins retest this, but to avoid spam I'll just wait until
you push a new commit to handle the `hdfs://` case.
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