1：练习spark的时候，操作大概如我读取hdfs上面的文件，然后spark懒加载以后，我读取详细信息出现如下所示的错误，错误虽然不大，我感觉有必要记录一下，因为错误的起因是对命令的不熟悉造成的，错误如下所示：

 scala> text.collect

 java.net.ConnectException: Call From slaver1/192.168.19.128 to slaver1: failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused

     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:)

     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:)

     at java.lang.reflect.Constructor.newInstance(Constructor.java:)

     at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:)

     at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:)

     at org.apache.hadoop.ipc.Client.call(Client.java:)

     at org.apache.hadoop.ipc.Client.call(Client.java:)

     at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:)

     at com.sun.proxy.$Proxy36.getFileInfo(Unknown Source)

     at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:)

     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:)

     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:)

     at java.lang.reflect.Method.invoke(Method.java:)

     at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:)

     at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:)

     at com.sun.proxy.$Proxy37.getFileInfo(Unknown Source)

     at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:)

     at org.apache.hadoop.hdfs.DistributedFileSystem$.doCall(DistributedFileSystem.java:)

     at org.apache.hadoop.hdfs.DistributedFileSystem$.doCall(DistributedFileSystem.java:)

     at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:)

     at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:)

     at org.apache.hadoop.fs.Globber.getFileStatus(Globber.java:)

     at org.apache.hadoop.fs.Globber.glob(Globber.java:)

     at org.apache.hadoop.fs.FileSystem.globStatus(FileSystem.java:)

     at org.apache.hadoop.mapred.FileInputFormat.singleThreadedListStatus(FileInputFormat.java:)

     at org.apache.hadoop.mapred.FileInputFormat.listStatus(FileInputFormat.java:)

     at org.apache.hadoop.mapred.FileInputFormat.getSplits(FileInputFormat.java:)

     at org.apache.spark.rdd.HadoopRDD.getPartitions(HadoopRDD.scala:)

     at org.apache.spark.rdd.RDD$$anonfun$partitions$.apply(RDD.scala:)

     at org.apache.spark.rdd.RDD$$anonfun$partitions$.apply(RDD.scala:)

     at scala.Option.getOrElse(Option.scala:)

     at org.apache.spark.rdd.RDD.partitions(RDD.scala:)

     at org.apache.spark.rdd.MapPartitionsRDD.getPartitions(MapPartitionsRDD.scala:)

     at org.apache.spark.rdd.RDD$$anonfun$partitions$.apply(RDD.scala:)

     at org.apache.spark.rdd.RDD$$anonfun$partitions$.apply(RDD.scala:)

     at scala.Option.getOrElse(Option.scala:)

     at org.apache.spark.rdd.RDD.partitions(RDD.scala:)

     at org.apache.spark.SparkContext.runJob(SparkContext.scala:)

     at org.apache.spark.rdd.RDD$$anonfun$collect$.apply(RDD.scala:)

     at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:)

     at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:)

     at org.apache.spark.rdd.RDD.withScope(RDD.scala:)

     at org.apache.spark.rdd.RDD.collect(RDD.scala:)

     at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:)

     at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:)

     at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:)

     at $iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:)

     at $iwC$$iwC$$iwC$$iwC.<init>(<console>:)

     at $iwC$$iwC$$iwC.<init>(<console>:)

     at $iwC$$iwC.<init>(<console>:)

     at $iwC.<init>(<console>:)

     at <init>(<console>:)

     at .<init>(<console>:)

     at .<clinit>(<console>)

     at .<init>(<console>:)

     at .<clinit>(<console>)

     at $print(<console>)

     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:)

     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:)

     at java.lang.reflect.Method.invoke(Method.java:)

     at org.apache.spark.repl.SparkIMain$ReadEvalPrint.call(SparkIMain.scala:)

     at org.apache.spark.repl.SparkIMain$Request.loadAndRun(SparkIMain.scala:)

     at org.apache.spark.repl.SparkIMain.loadAndRunReq$(SparkIMain.scala:)

     at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:)

     at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:)

     at org.apache.spark.repl.SparkILoop.reallyInterpret$(SparkILoop.scala:)

     at org.apache.spark.repl.SparkILoop.interpretStartingWith(SparkILoop.scala:)

     at org.apache.spark.repl.SparkILoop.command(SparkILoop.scala:)

     at org.apache.spark.repl.SparkILoop.processLine$(SparkILoop.scala:)

     at org.apache.spark.repl.SparkILoop.innerLoop$(SparkILoop.scala:)

     at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$loop(SparkILoop.scala:)

     at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$.apply$mcZ$sp(SparkILoop.scala:)

     at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$.apply(SparkILoop.scala:)

     at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$.apply(SparkILoop.scala:)

     at scala.tools.nsc.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:)

     at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$process(SparkILoop.scala:)

     at org.apache.spark.repl.SparkILoop.process(SparkILoop.scala:)

     at org.apache.spark.repl.Main$.main(Main.scala:)

     at org.apache.spark.repl.Main.main(Main.scala)

     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:)

     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:)

     at java.lang.reflect.Method.invoke(Method.java:)

     at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:)

     at org.apache.spark.deploy.SparkSubmit$.doRunMain$(SparkSubmit.scala:)

     at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:)

     at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:)

     at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

 Caused by: java.net.ConnectException: Connection refused

     at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)

     at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:)

     at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:)

     at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:)

     at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:)

     at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:)

     at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:)

     at org.apache.hadoop.ipc.Client$Connection.access$(Client.java:)

     at org.apache.hadoop.ipc.Client.getConnection(Client.java:)

     at org.apache.hadoop.ipc.Client.call(Client.java:)

     ...  more

2：错误原因如下所示：

我使用了如下所示命令来读取hdfs上面的文件，scala> var text = sc.textFile("hdfs://slaver1:/input.txt");，然后使用text.collect命令来查看详细信息，就是查看详细信息的时候报的上面的错误，错误原因是因为我读取hdfs文件的时候少了端口号，造成的错误；

修改为如下所示即可：

scala> var text = sc.textFile("hdfs://slaver1:9000/input.txt");

scala> text.collect

java.net.ConnectException: Call From slaver1/192.168.19.128 to slaver1:8020 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org的更多相关文章

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