本文介绍了为什么Spark失败并且“无法获得broadcast_0的broadcast_0_piece0”在本地模式？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在运行此代码片段来对点的RDD进行排序，对RDD进行排序并从给定点获取K-最近点：
I'm running this snippet to sort an RDD of points, ordering the RDD and taking the K-nearest points from a given point:
def getKNN(sparkContext:SparkContext, k:Int, point2:Array[Double], pointsRDD:RDD[Array[Double]]): RDD[Array[Double]] = {
val tuplePointDistanceRDD:RDD[(Double, Array[Double])] = pointsRDD.map(point =>
(DistanceUtils.euclidianDistance(point, point2), point))
sparkContext.parallelize(tuplePointDistanceRDD.sortBy(_._1).map(_._2).take(k))
}
在我的应用程序中只使用一个SparkContext并将其作为参数传递给我的函数，我得到一个 org.apache.spark.SparkException：无法获取broadcast_0 的broadcast_0_piece0当我调用 sparkContext.parallelize（tuplePointDistanceRDD.sortBy（_._ 1）.map（_._ 2）.take（k））从 point2 获得KNN积分。
Using just one SparkContext in my application and passing it as a parameter to my function, I'm getting a org.apache.spark.SparkException: Failed to get broadcast_0_piece0 of broadcast_0 error at the moment I call sparkContext.parallelize(tuplePointDistanceRDD.sortBy(_._1).map(_._2).take(k)) to get the KNN points from point2.
我是建造者g sparkContext 如下图所示：
I'm constructing sparkContext as this snippet bellow:
var sparkContext = new SparkContext("local", "<app_name>")
面对这种情况的可能原因是什么？错误？
What would be the possible causes of facing this kind of error?
基本上这是我的独立spark环境的LOG，其中包含此错误的堆栈跟踪：
Basically this is the LOG of my standalone spark environment with the stack trace of this error:
15/12/24 11:55:29 INFO Remoting: Remoting started; listening on addresses :[akka.tcp://sparkDriver@localhost:55731]
15/12/24 11:55:29 INFO Utils: Successfully started service 'sparkDriver' on port 55731.
15/12/24 11:55:29 INFO SparkEnv: Registering MapOutputTracker
15/12/24 11:55:29 INFO SparkEnv: Registering BlockManagerMaster
15/12/24 11:55:29 INFO DiskBlockManager: Created local directory at /private/var/folders/0r/3b6d3b6j45774_9616myw4440000gn/T/blockmgr-70e73cfe-683b-4297-aa5d-de38f98d02f1
15/12/24 11:55:29 INFO MemoryStore: MemoryStore started with capacity 491.7 MB
15/12/24 11:55:29 INFO HttpFileServer: HTTP File server directory is /private/var/folders/0r/3b6d3b6j45774_9616myw4440000gn/T/spark-f7bc8b6f-7d4f-4c55-8dff-0fbc4f6c2532/httpd-fb502369-4c28-4585-a37e-f3645d1d55a3
15/12/24 11:55:29 INFO HttpServer: Starting HTTP Server
15/12/24 11:55:29 INFO Utils: Successfully started service 'HTTP file server' on port 55732.
15/12/24 11:55:29 INFO SparkEnv: Registering OutputCommitCoordinator
15/12/24 11:55:29 INFO Utils: Successfully started service 'SparkUI' on port 4040.
15/12/24 11:55:29 INFO SparkUI: Started SparkUI at http://localhost:4040
15/12/24 11:55:29 WARN MetricsSystem: Using default name DAGScheduler for source because spark.app.id is not set.
15/12/24 11:55:29 INFO Executor: Starting executor ID driver on host localhost
15/12/24 11:55:29 INFO Utils: Successfully started service 'org.apache.spark.network.netty.NettyBlockTransferService' on port 55733.
15/12/24 11:55:29 INFO NettyBlockTransferService: Server created on 55733
15/12/24 11:55:29 INFO BlockManagerMaster: Trying to register BlockManager
15/12/24 11:55:29 INFO BlockManagerMasterEndpoint: Registering block manager localhost:55733 with 491.7 MB RAM, BlockManagerId(driver, localhost, 55733)
15/12/24 11:55:29 INFO BlockManagerMaster: Registered BlockManager
15/12/24 11:55:30 INFO TorrentBroadcast: Started reading broadcast variable 0
org.apache.spark.SparkException: Failed to get broadcast_0_piece0 of broadcast_0
java.io.IOException: org.apache.spark.SparkException: Failed to get broadcast_0_piece0 of broadcast_0
at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1178)
at org.apache.spark.broadcast.TorrentBroadcast.readBroadcastBlock(TorrentBroadcast.scala:165)
at org.apache.spark.broadcast.TorrentBroadcast._value$lzycompute(TorrentBroadcast.scala:64)
at org.apache.spark.broadcast.TorrentBroadcast._value(TorrentBroadcast.scala:64)
at org.apache.spark.broadcast.TorrentBroadcast.getValue(TorrentBroadcast.scala:88)
at org.apache.spark.broadcast.Broadcast.value(Broadcast.scala:70)
at org.apache.spark.rdd.HadoopRDD.getJobConf(HadoopRDD.scala:144)
at org.apache.spark.rdd.HadoopRDD.getPartitions(HadoopRDD.scala:200)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:239)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:237)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.rdd.RDD.partitions(RDD.scala:237)
at org.apache.spark.rdd.MapPartitionsRDD.getPartitions(MapPartitionsRDD.scala:35)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:239)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:237)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.rdd.RDD.partitions(RDD.scala:237)
at org.apache.spark.rdd.MapPartitionsRDD.getPartitions(MapPartitionsRDD.scala:35)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:239)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:237)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.rdd.RDD.partitions(RDD.scala:237)
at org.apache.spark.rdd.MapPartitionsRDD.getPartitions(MapPartitionsRDD.scala:35)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:239)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:237)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.rdd.RDD.partitions(RDD.scala:237)
at org.apache.spark.rdd.MapPartitionsRDD.getPartitions(MapPartitionsRDD.scala:35)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:239)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:237)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.rdd.RDD.partitions(RDD.scala:237)
at org.apache.spark.rdd.RDD.sortBy$default$3(RDD.scala:548)
at LOF$.getKNN(LOF.scala:14)
at LOF$.lof(LOF.scala:25)
at BehaviourActivityScoreJudgeTest$$anonfun$1.apply$mcV$sp(BehaviourActivityScoreJudgeTest.scala:14)
at BehaviourActivityScoreJudgeTest$$anonfun$1.apply(BehaviourActivityScoreJudgeTest.scala:11)
at BehaviourActivityScoreJudgeTest$$anonfun$1.apply(BehaviourActivityScoreJudgeTest.scala:11)
at org.scalatest.Transformer$$anonfun$apply$1.apply$mcV$sp(Transformer.scala:22)
at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85)
at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
at org.scalatest.Transformer.apply(Transformer.scala:22)
at org.scalatest.Transformer.apply(Transformer.scala:20)
at org.scalatest.FlatSpecLike$$anon$1.apply(FlatSpecLike.scala:1647)
at org.scalatest.Suite$class.withFixture(Suite.scala:1122)
at org.scalatest.FlatSpec.withFixture(FlatSpec.scala:1683)
at org.scalatest.FlatSpecLike$class.invokeWithFixture$1(FlatSpecLike.scala:1644)
at org.scalatest.FlatSpecLike$$anonfun$runTest$1.apply(FlatSpecLike.scala:1656)
at org.scalatest.FlatSpecLike$$anonfun$runTest$1.apply(FlatSpecLike.scala:1656)
at org.scalatest.SuperEngine.runTestImpl(Engine.scala:306)
at org.scalatest.FlatSpecLike$class.runTest(FlatSpecLike.scala:1656)
at org.scalatest.FlatSpec.runTest(FlatSpec.scala:1683)
at org.scalatest.FlatSpecLike$$anonfun$runTests$1.apply(FlatSpecLike.scala:1714)
at org.scalatest.FlatSpecLike$$anonfun$runTests$1.apply(FlatSpecLike.scala:1714)
at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:413)
at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:401)
at scala.collection.immutable.List.foreach(List.scala:318)
at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:401)
at org.scalatest.SuperEngine.org$scalatest$SuperEngine$$runTestsInBranch(Engine.scala:390)
at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:427)
at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:401)
at scala.collection.immutable.List.foreach(List.scala:318)
at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:401)
at org.scalatest.SuperEngine.org$scalatest$SuperEngine$$runTestsInBranch(Engine.scala:396)
at org.scalatest.SuperEngine.runTestsImpl(Engine.scala:483)
at org.scalatest.FlatSpecLike$class.runTests(FlatSpecLike.scala:1714)
at org.scalatest.FlatSpec.runTests(FlatSpec.scala:1683)
at org.scalatest.Suite$class.run(Suite.scala:1424)
at org.scalatest.FlatSpec.org$scalatest$FlatSpecLike$$super$run(FlatSpec.scala:1683)
at org.scalatest.FlatSpecLike$$anonfun$run$1.apply(FlatSpecLike.scala:1760)
at org.scalatest.FlatSpecLike$$anonfun$run$1.apply(FlatSpecLike.scala:1760)
at org.scalatest.SuperEngine.runImpl(Engine.scala:545)
at org.scalatest.FlatSpecLike$class.run(FlatSpecLike.scala:1760)
at BehaviourActivityScoreJudgeTest.org$scalatest$BeforeAndAfterAll$$super$run(BehaviourActivityScoreJudgeTest.scala:4)
at org.scalatest.BeforeAndAfterAll$class.liftedTree1$1(BeforeAndAfterAll.scala:257)
at org.scalatest.BeforeAndAfterAll$class.run(BeforeAndAfterAll.scala:256)
at BehaviourActivityScoreJudgeTest.run(BehaviourActivityScoreJudgeTest.scala:4)
at org.scalatest.tools.SuiteRunner.run(SuiteRunner.scala:55)
at org.scalatest.tools.Runner$$anonfun$doRunRunRunDaDoRunRun$3.apply(Runner.scala:2563)
at org.scalatest.tools.Runner$$anonfun$doRunRunRunDaDoRunRun$3.apply(Runner.scala:2557)
at scala.collection.immutable.List.foreach(List.scala:318)
at org.scalatest.tools.Runner$.doRunRunRunDaDoRunRun(Runner.scala:2557)
at org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply(Runner.scala:1044)
at org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply(Runner.scala:1043)
at org.scalatest.tools.Runner$.withClassLoaderAndDispatchReporter(Runner.scala:2722)
at org.scalatest.tools.Runner$.runOptionallyWithPassFailReporter(Runner.scala:1043)
at org.scalatest.tools.Runner$.run(Runner.scala:883)
at org.scalatest.tools.Runner.run(Runner.scala)
at org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.runScalaTest2(ScalaTestRunner.java:137)
at org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.main(ScalaTestRunner.java:28)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
Caused by: org.apache.spark.SparkException: Failed to get broadcast_0_piece0 of broadcast_0
at org.apache.spark.broadcast.TorrentBroadcast$$anonfun$org$apache$spark$broadcast$TorrentBroadcast$$readBlocks$1$$anonfun$2.apply(TorrentBroadcast.scala:138)
at org.apache.spark.broadcast.TorrentBroadcast$$anonfun$org$apache$spark$broadcast$TorrentBroadcast$$readBlocks$1$$anonfun$2.apply(TorrentBroadcast.scala:138)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.broadcast.TorrentBroadcast$$anonfun$org$apache$spark$broadcast$TorrentBroadcast$$readBlocks$1.apply$mcVI$sp(TorrentBroadcast.scala:137)
at org.apache.spark.broadcast.TorrentBroadcast$$anonfun$org$apache$spark$broadcast$TorrentBroadcast$$readBlocks$1.apply(TorrentBroadcast.scala:120)
at org.apache.spark.broadcast.TorrentBroadcast$$anonfun$org$apache$spark$broadcast$TorrentBroadcast$$readBlocks$1.apply(TorrentBroadcast.scala:120)
at scala.collection.immutable.List.foreach(List.scala:318)
at org.apache.spark.broadcast.TorrentBroadcast.org$apache$spark$broadcast$TorrentBroadcast$$readBlocks(TorrentBroadcast.scala:120)
at org.apache.spark.broadcast.TorrentBroadcast$$anonfun$readBroadcastBlock$1.apply(TorrentBroadcast.scala:175)
at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1175)
... 94 more
15/12/24 11:55:30 INFO SparkUI: Stopped Spark web UI at http://localhost:4040
15/12/24 11:55:30 INFO DAGScheduler: Stopping DAGScheduler
15/12/24 11:55:30 INFO MapOutputTrackerMasterEndpoint: MapOutputTrackerMasterEndpoint stopped!
15/12/24 11:55:30 INFO MemoryStore: MemoryStore cleared
15/12/24 11:55:30 INFO BlockManager: BlockManager stopped
15/12/24 11:55:30 INFO BlockManagerMaster: BlockManagerMaster stopped
15/12/24 11:55:30 INFO OutputCommitCoordinator$OutputCommitCoordinatorEndpoint: OutputCommitCoordinator stopped!
15/12/24 11:55:30 INFO SparkContext: Successfully stopped SparkContext
15/12/24 11:55:30 INFO RemoteActorRefProvider$RemotingTerminator: Shutting down remote daemon.
15/12/24 11:55:30 INFO RemoteActorRefProvider$RemotingTerminator: Remote daemon shut down; proceeding with flushing remote transports.
15/12/24 11:55:30 INFO RemoteActorRefProvider$RemotingTerminator: Remoting shut down.
推荐答案
刚刚发现为什么我得到这个例外：原因我的 SparkContext 对象在 ScalaTest 方法之间多次启动/停止。所以，修正这种行为会让我以正常的方式获得火花。
Just discovered why I was getting this exception: for a reason my SparkContext object started/stopped several times between ScalaTest methods. So, fixing that behaviour lead me to get spark working in the right way I would expect.
这篇关于为什么Spark失败并且“无法获得broadcast_0的broadcast_0_piece0”在本地模式？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！