Hadoop Spark-连接异常失败：java.net.ConnectException-localhost

我在一台机器上运行hadoop和spark（Ubuntu 14.04）。JPS命令提供以下输出

hduser@ubuntu:~$ jps
4370 HRegionServer
6568 Jps
5555 RunJar
3744 TaskTracker
5341 RunJar
4120 HQuorumPeer
5790 SparkSubmit
3308 DataNode
4203 HMaster
3469 SecondaryNameNode
3079 NameNode
3587 JobTracker

hduser@ubuntu:~$ lsof -p 3079 -a -i
COMMAND  PID   USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
java    3079 hduser   65u  IPv4  17260      0t0  TCP *:33736 (LISTEN)
java    3079 hduser   75u  IPv4  17341      0t0  TCP localhost:54310 (LISTEN)
java    3079 hduser   85u  IPv4  22609      0t0  TCP *:50070 (LISTEN)
java    3079 hduser   89u  IPv4  59998      0t0  TCP localhost:54310->localhost:46507 (ESTABLISHED)

我已经在HDFS中创建了一个简单的csv文件。下面是该文件的详细信息

hduser@ubuntu:~$ hadoop fs -ls /user/hduser/file_for_spark/spark1.csv
Warning: $HADOOP_HOME is deprecated.

Found 1 items
-rw-r--r--   1 hduser supergroup        174 2015-04-16 08:14 /user/hduser/file_for_spark/spark1.csv

但是，在尝试从spark访问该文件时，我遇到了连接失败异常：java.net.ConnectException:connection-rejected错误

          ____              __
     / __/__  ___ _____/ /__
    _\ \/ _ \/ _ `/ __/  '_/
   /___/ .__/\_,_/_/ /_/\_\   version 1.3.0
      /_/

Using Scala version 2.10.4 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_21)
Type in expressions to have them evaluated.
Type :help for more information.
Spark context available as sc.
SQL context available as sqlContext.

scala> val pagecount=sc.textFile("hdfs://localhost:3079/user/hduser/file_for_spark/spark1.csv")
pagecount: org.apache.spark.rdd.RDD[String] = hdfs://localhost:3079/user/hduser/file_for_spark/spark1.csv MapPartitionsRDD[1] at textFile at <console>:21

scala> pagecount.count()
java.net.ConnectException: Call to localhost/127.0.0.1:3079 failed on connection exception: java.net.ConnectException: Connection refused
    at org.apache.hadoop.ipc.Client.wrapException(Client.java:1099)
    at org.apache.hadoop.ipc.Client.call(Client.java:1075)
    at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:225)
    at com.sun.proxy.$Proxy11.getProtocolVersion(Unknown Source)
    at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:396)
    at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:379)
    at org.apache.hadoop.hdfs.DFSClient.createRPCNamenode(DFSClient.java:119)
    at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:238)
    at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:203)
    at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:89)
    at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1386)
    at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:66)
    at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1404)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:254)
    at org.apache.hadoop.fs.Path.getFileSystem(Path.java:187)
    at org.apache.hadoop.mapred.FileInputFormat.listStatus(FileInputFormat.java:176)
    at org.apache.hadoop.mapred.FileInputFormat.getSplits(FileInputFormat.java:208)
    at org.apache.spark.rdd.HadoopRDD.getPartitions(HadoopRDD.scala:203)
    at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:219)
    at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:217)
    at scala.Option.getOrElse(Option.scala:120)
    at org.apache.spark.rdd.RDD.partitions(RDD.scala:217)
    at org.apache.spark.rdd.MapPartitionsRDD.getPartitions(MapPartitionsRDD.scala:32)
    at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:219)
    at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:217)
    at scala.Option.getOrElse(Option.scala:120)
    at org.apache.spark.rdd.RDD.partitions(RDD.scala:217)
    at org.apache.spark.SparkContext.runJob(SparkContext.scala:1511)
    at org.apache.spark.rdd.RDD.count(RDD.scala:1006)
    at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:24)
    at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:29)
    at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:31)
    at $iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:33)
    at $iwC$$iwC$$iwC$$iwC.<init>(<console>:35)
    at $iwC$$iwC$$iwC.<init>(<console>:37)
    at $iwC$$iwC.<init>(<console>:39)
    at $iwC.<init>(<console>:41)
    at <init>(<console>:43)
    at .<init>(<console>:47)
    at .<clinit>(<console>)
    at .<init>(<console>:7)
    at .<clinit>(<console>)
    at $print(<console>)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.apache.spark.repl.SparkIMain$ReadEvalPrint.call(SparkIMain.scala:1065)
    at org.apache.spark.repl.SparkIMain$Request.loadAndRun(SparkIMain.scala:1338)
    at org.apache.spark.repl.SparkIMain.loadAndRunReq$1(SparkIMain.scala:840)
    at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:871)
    at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:819)
    at org.apache.spark.repl.SparkILoop.reallyInterpret$1(SparkILoop.scala:856)
    at org.apache.spark.repl.SparkILoop.interpretStartingWith(SparkILoop.scala:901)
    at org.apache.spark.repl.SparkILoop.command(SparkILoop.scala:813)
    at org.apache.spark.repl.SparkILoop.processLine$1(SparkILoop.scala:656)
    at org.apache.spark.repl.SparkILoop.innerLoop$1(SparkILoop.scala:664)
    at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$loop(SparkILoop.scala:669)
    at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply$mcZ$sp(SparkILoop.scala:996)
    at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:944)
    at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:944)
    at scala.tools.nsc.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:135)
    at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$process(SparkILoop.scala:944)
    at org.apache.spark.repl.SparkILoop.process(SparkILoop.scala:1058)
    at org.apache.spark.repl.Main$.main(Main.scala:31)
    at org.apache.spark.repl.Main.main(Main.scala)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:569)
    at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:166)
    at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:189)
    at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:110)
    at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: java.net.ConnectException: Connection refused
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:692)
    at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
    at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:489)
    at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:434)
    at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:560)
    at org.apache.hadoop.ipc.Client$Connection.access$2000(Client.java:184)
    at org.apache.hadoop.ipc.Client.getConnection(Client.java:1206)
    at org.apache.hadoop.ipc.Client.call(Client.java:1050)
    ... 73 more

---

你能告诉我46507端口到底发生了什么吗对不起。。。实际上，namenode运行在我从core-site.xml中找到的另一个端口中。在使用端口54310后，它对我有效

<property>
  <name>fs.default.name</name>
  <value>hdfs://localhost:54310</value>
  <description>The name of the default file system.  A URI whose
  scheme and authority determine the FileSystem implementation.  The
  uri's scheme determines the config property (fs.SCHEME.impl) naming
  the FileSystem implementation class.  The uri's authority is used to
  determine the host, port, etc. for a filesystem.</description>
</property>
</configuration>

fs.default.name
hdfs://localhost:54310
默认文件系统的名称。其
方案和权限决定文件系统的实现。这个
uri的方案决定了配置属性（fs.scheme.impl）的命名
文件系统实现类。uri的权限用于
确定文件系统的主机、端口等。

---

有人能告诉我3079在这里是什么意思吗，这是JPS命令的输出。

这是你自己的一个好答案！：）

3079是namenode的pid（进程id）。请在此处查看有关jps输出的更多详细信息：。顺便说一句，您可以使用以下命令使用pid验证namenode的侦听端口：

lsof -p 3079 -a -i

在命令输出中：

java    3079 hduser   89u  IPv4  59998      0t0  TCP localhost:54310->localhost:46507 (ESTABLISHED)

---

该行表示其他进程在端口46507与Namenode建立了TCP连接。可能的过程可能是资源管理器（RM）或数据节点等。

您试图与一个没有HDFSI权限的用户连接到hdfs。我知道您已经回答了您的问题，但代码片段仅用于JavaScript、CSS和HTML，首先，注释不能作为答案！如果希望添加信息，可以编辑问题。不带标志的

jps

的输出是java进程ID的列表。尝试使用

jps--help

查看所有可用选项