Apache Spark:由于阶段失败导致作业中止:"TID x因未知原因失败"

我正在处理一些奇怪的错误消息,我认为这些消息归结为内存问题,但我很难将其固定下来并可以使用专家的一些指导.

我有一台2机Spark(1.0.1)集群.两台机器都有8个核心; 一个有16GB内存,另一个有32GB(这是主机).我的应用涉及计算图像中的成对像素亲和力,尽管到目前为止我测试过的图像只有1920x1200,小到16x16.

我确实需要更改一些内存和并行设置,否则我会得到明确的OutOfMemoryExceptions.在spark-default.conf中:

spark.executor.memory    14g
spark.default.parallelism    32
spark.akka.frameSize        1000

在spark-env.sh中:

SPARK_DRIVER_MEMORY=10G

但是,通过这些设置,除了丢失的执行程序之外,我还得到了一堆关于"丢失的TID"(没有任务成功完成)的WARN语句,这些语句重复4次,直到我最终得到以下错误消息并崩溃:

14/07/18 12:06:20 INFO TaskSchedulerImpl: Cancelling stage 0
14/07/18 12:06:20 INFO DAGScheduler: Failed to run collect at /home/user/Programming/PySpark-Affinities/affinity.py:243
Traceback (most recent call last):
  File "/home/user/Programming/PySpark-Affinities/affinity.py", line 243, in 
    lambda x: np.abs(IMAGE.value[x[0]] - IMAGE.value[x[1]])
  File "/net/antonin/home/user/Spark/spark-1.0.1-bin-hadoop2/python/pyspark/rdd.py", line 583, in collect
    bytesInJava = self._jrdd.collect().iterator()
  File "/net/antonin/home/user/Spark/spark-1.0.1-bin-hadoop2/python/lib/py4j-0.8.1-src.zip/py4j/java_gateway.py", line 537, in __call__
  File "/net/antonin/home/user/Spark/spark-1.0.1-bin-hadoop2/python/lib/py4j-0.8.1-src.zip/py4j/protocol.py", line 300, in get_return_value
py4j.protocol.Py4JJavaError: An error occurred while calling o27.collect.
: org.apache.spark.SparkException: Job aborted due to stage failure: Task 0.0:13 failed 4 times, most recent failure: TID 32 on host master.host.univ.edu failed for unknown reason
Driver stacktrace:
    at org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGScheduler$$failJobAndIndependentStages(DAGScheduler.scala:1044)
    at org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1028)
    at org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1026)
    at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
    at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:47)
    at org.apache.spark.scheduler.DAGScheduler.abortStage(DAGScheduler.scala:1026)
    at org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:634)
    at org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:634)
    at scala.Option.foreach(Option.scala:236)
    at org.apache.spark.scheduler.DAGScheduler.handleTaskSetFailed(DAGScheduler.scala:634)
    at org.apache.spark.scheduler.DAGSchedulerEventProcessActor$$anonfun$receive$2.applyOrElse(DAGScheduler.scala:1229)
    at akka.actor.ActorCell.receiveMessage(ActorCell.scala:498)
    at akka.actor.ActorCell.invoke(ActorCell.scala:456)
    at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:237)
    at akka.dispatch.Mailbox.run(Mailbox.scala:219)
    at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:386)
    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)

14/07/18 12:06:20 INFO DAGScheduler: Executor lost: 4 (epoch 4)
14/07/18 12:06:20 INFO BlockManagerMasterActor: Trying to remove executor 4 from BlockManagerMaster.
14/07/18 12:06:20 INFO BlockManagerMaster: Removed 4 successfully in removeExecutor
user@master:~/Programming/PySpark-Affinities$