使用SparkR,我试图让PoC收集从包含大约4M行的文本文件创建的RDD。SparkR收集方法在Java堆空间上使用OutOfMemory崩溃
我的Spark群集在Google Cloud中运行,并且由bdutil进行部署,由1个主服务器和2个工作服务器组成,每个服务器有15GB的RAM和4个内核。我的HDFS存储库基于带有gcs-connector 1.4.0的Google Storage。在每台机器上安装SparkR,基本测试正在处理小文件。
这里是我使用的脚本:
Sys.setenv("SPARK_MEM" = "1g")
sc <- sparkR.init("spark://xxxx:7077", sparkEnvir=list(spark.executor.memory="1g"))
lines <- textFile(sc, "gs://xxxx/dir/")
test <- collect(lines)
我第一次运行它,它似乎是工作的罚款,所有的任务都成功运行,火花的UI说,作业已完成,但我从来没有将R背提示:
15/06/04 13:36:59 WARN SparkConf: Setting 'spark.executor.extraClassPath' to ':/home/hadoop/hadoop-install/lib/gcs-connector-1.4.0-hadoop1.jar' as a work-around.
15/06/04 13:36:59 WARN SparkConf: Setting 'spark.driver.extraClassPath' to ':/home/hadoop/hadoop-install/lib/gcs-connector-1.4.0-hadoop1.jar' as a work-around.
15/06/04 13:36:59 INFO Slf4jLogger: Slf4jLogger started
15/06/04 13:37:00 INFO Server: jetty-8.y.z-SNAPSHOT
15/06/04 13:37:00 INFO AbstractConnector: Started [email protected]:52439
15/06/04 13:37:00 INFO Server: jetty-8.y.z-SNAPSHOT
15/06/04 13:37:00 INFO AbstractConnector: Started [email protected]:4040
15/06/04 13:37:54 INFO GoogleHadoopFileSystemBase: GHFS version: 1.4.0-hadoop1
15/06/04 13:37:55 WARN LoadSnappy: Snappy native library is available
15/06/04 13:37:55 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
15/06/04 13:37:55 WARN LoadSnappy: Snappy native library not loaded
15/06/04 13:37:55 INFO FileInputFormat: Total input paths to process : 68
[Stage 0:=======================================================> (27 + 10)/68]
再经过CTRL-C即可将R提示后,我尝试再次运行collect方法,这里是结果:
[Stage 1:==========================================================> (28 + 9)/68]15/06/04 13:42:08 ERROR ActorSystemImpl: Uncaught fatal error from thread [sparkDriver-akka.remote.default-remote-dispatcher-5] shutting down ActorSystem [sparkDriver]
java.lang.OutOfMemoryError: Java heap space
at org.spark_project.protobuf.ByteString.toByteArray(ByteString.java:515)
at akka.remote.serialization.MessageContainerSerializer.fromBinary(MessageContainerSerializer.scala:64)
at akka.serialization.Serialization$$anonfun$deserialize$1.apply(Serialization.scala:104)
at scala.util.Try$.apply(Try.scala:161)
at akka.serialization.Serialization.deserialize(Serialization.scala:98)
at akka.remote.MessageSerializer$.deserialize(MessageSerializer.scala:23)
at akka.remote.DefaultMessageDispatcher.payload$lzycompute$1(Endpoint.scala:58)
at akka.remote.DefaultMessageDispatcher.payload$1(Endpoint.scala:58)
at akka.remote.DefaultMessageDispatcher.dispatch(Endpoint.scala:76)
at akka.remote.EndpointReader$$anonfun$receive$2.applyOrElse(Endpoint.scala:937)
at akka.actor.Actor$class.aroundReceive(Actor.scala:465)
at akka.remote.EndpointActor.aroundReceive(Endpoint.scala:415)
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)
我了解异常消息,但我不明白为什么我第二次得到此消息。 另外,为什么收集完成后在Spark中永远不会返回?
我使用谷歌搜索的每一条信息,但我没有找到解决方法。任何帮助或提示将不胜感激!
由于
我还没有关于火星脚本的想法,但火花上下文必须接近回来提示。 – Tinku
感谢您的回答。这是交互模式,所以这是正常的,我没有在这里关闭上下文。这就像使用火花外壳。 – Gouffe
你的4M行文件有多大?你缓存你的数据(RDD)是否为 –