Github user davies commented on the pull request:
https://github.com/apache/spark/pull/2941#issuecomment-60475340
It's not easy to reproduce this failure, but it did fail in jenkins:
```
======================================================================
ERROR: test_reuse_worker_after_take (__main__.WorkerTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "pyspark/tests.py", line 1437, in test_reuse_worker_after_take
self.assertEqual(0, rdd.first())
File
"/home/jenkins/workspace/SparkPullRequestBuilder/python/pyspark/rdd.py", line
1109, in first
rs = self.take(1)
File
"/home/jenkins/workspace/SparkPullRequestBuilder/python/pyspark/rdd.py", line
1091, in take
res = self.context.runJob(self, takeUpToNumLeft, p, True)
File
"/home/jenkins/workspace/SparkPullRequestBuilder/python/pyspark/context.py",
line 796, in runJob
it = self._jvm.PythonRDD.runJob(self._jsc.sc(), mappedRDD._jrdd,
javaPartitions, allowLocal)
File
"/home/jenkins/workspace/SparkPullRequestBuilder/python/lib/py4j-0.8.2.1-src.zip/py4j/java_gateway.py",
line 538, in __call__
self.target_id, self.name)
File
"/home/jenkins/workspace/SparkPullRequestBuilder/python/lib/py4j-0.8.2.1-src.zip/py4j/protocol.py",
line 300, in get_return_value
format(target_id, '.', name), value)
Py4JJavaError: An error occurred while calling
z:org.apache.spark.api.python.PythonRDD.runJob.
: org.apache.spark.SparkException: Job aborted due to stage failure: Task 0
in stage 0.0 failed 1 times, most recent failure: Lost task 0.0 in stage 0.0
(TID 0, localhost): java.net.SocketException: Connection reset
java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:118)
java.net.SocketOutputStream.write(SocketOutputStream.java:159)
java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
java.io.BufferedOutputStream.write(BufferedOutputStream.java:126)
java.io.DataOutputStream.write(DataOutputStream.java:107)
java.io.FilterOutputStream.write(FilterOutputStream.java:97)
org.apache.spark.api.python.PythonRDD$$anonfun$writeIteratorToStream$1.apply(PythonRDD.scala:395)
org.apache.spark.api.python.PythonRDD$$anonfun$writeIteratorToStream$1.apply(PythonRDD.scala:393)
scala.collection.Iterator$class.foreach(Iterator.scala:727)
scala.collection.AbstractIterator.foreach(Iterator.scala:1157)
org.apache.spark.api.python.PythonRDD$.writeIteratorToStream(PythonRDD.scala:393)
org.apache.spark.api.python.PythonRDD$WriterThread$$anonfun$run$1.apply$mcV$sp(PythonRDD.scala:243)
org.apache.spark.api.python.PythonRDD$WriterThread$$anonfun$run$1.apply(PythonRDD.scala:204)
org.apache.spark.api.python.PythonRDD$WriterThread$$anonfun$run$1.apply(PythonRDD.scala:204)
org.apache.spark.util.Utils$.logUncaughtExceptions(Utils.scala:1416)
org.apache.spark.api.python.PythonRDD$WriterThread.run(PythonRDD.scala:203)
Driver stacktrace:
at
org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGScheduler$$failJobAndIndependentStages(DAGScheduler.scala:1191)
at
org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1180)
at
org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1179)
at
scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:47)
at
org.apache.spark.scheduler.DAGScheduler.abortStage(DAGScheduler.scala:1179)
at
org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:694)
at
org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:694)
at scala.Option.foreach(Option.scala:236)
at
org.apache.spark.scheduler.DAGScheduler.handleTaskSetFailed(DAGScheduler.scala:694)
at
org.apache.spark.scheduler.DAGSchedulerEventProcessActor$$anonfun$receive$2.applyOrElse(DAGScheduler.scala:1397)
at akka.actor.Actor$class.aroundReceive(Actor.scala:465)
at
org.apache.spark.scheduler.DAGSchedulerEventProcessActor.aroundReceive(DAGScheduler.scala:1352)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
at akka.actor.ActorCell.invoke(ActorCell.scala:487)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238)
at akka.dispatch.Mailbox.run(Mailbox.scala:220)
at
akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:393)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at
scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at
scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at
scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
```
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