spark执行任务报错 java.net.ConnectException

spark执行任务时，总是抛连接拒绝的信息，详细信息如下：

15/01/09 03:10:23 INFO storage.MemoryStore: ensureFreeSpace(163705) called with curMem=0, maxMem=280248975
15/01/09 03:10:23 INFO storage.MemoryStore: Block broadcast_0 stored as values in memory (estimated size 159.9 KB, free 267.1 MB)
15/01/09 03:10:23 INFO storage.MemoryStore: ensureFreeSpace(23010) called with curMem=163705, maxMem=280248975
15/01/09 03:10:23 INFO storage.MemoryStore: Block broadcast_0_piece0 stored as bytes in memory (estimated size 22.5 KB, free 267.1 MB)
15/01/09 03:10:23 INFO storage.BlockManagerInfo: Added broadcast_0_piece0 in memory on hadoop-001:52181 (size: 22.5 KB, free: 267.2 MB)
15/01/09 03:10:23 INFO storage.BlockManagerMaster: Updated info of block broadcast_0_piece0
15/01/09 03:10:23 INFO spark.SparkContext: Created broadcast 0 from textFile at FirstSparkDemo.java:29
Exception in thread "main" java.net.ConnectException: Call From hadoop-001/192.168.12.211 to hadoop-002:8020 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:57)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
        at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:783)
        at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:730)
        at org.apache.hadoop.ipc.Client.call(Client.java:1414)
        at org.apache.hadoop.ipc.Client.call(Client.java:1363)
        at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:206)
        at com.sun.proxy.$Proxy13.getFileInfo(Unknown Source)
        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:606)
        at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:190)
        at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:103)
        at com.sun.proxy.$Proxy13.getFileInfo(Unknown Source)
        at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:699)
        at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:1762)
        at org.apache.hadoop.hdfs.DistributedFileSystem$17.doCall(DistributedFileSystem.java:1124)
        at org.apache.hadoop.hdfs.DistributedFileSystem$17.doCall(DistributedFileSystem.java:1120)
        at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
        at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1120)
        at org.apache.hadoop.fs.Globber.getFileStatus(Globber.java:57)
        at org.apache.hadoop.fs.Globber.glob(Globber.java:248)
        at org.apache.hadoop.fs.FileSystem.globStatus(FileSystem.java:1642)
        at org.apache.hadoop.mapred.FileInputFormat.singleThreadedListStatus(FileInputFormat.java:257)
        at org.apache.hadoop.mapred.FileInputFormat.listStatus(FileInputFormat.java:228)
        at org.apache.hadoop.mapred.FileInputFormat.getSplits(FileInputFormat.java:304)
        at org.apache.spark.rdd.HadoopRDD.getPartitions(HadoopRDD.scala:201)
        at org.apache.spark.rdd.RDD$anonfun$partitions$2.apply(RDD.scala:205)
        at org.apache.spark.rdd.RDD$anonfun$partitions$2.apply(RDD.scala:203)
        at scala.Option.getOrElse(Option.scala:120)
        at org.apache.spark.rdd.RDD.partitions(RDD.scala:203)
        at org.apache.spark.rdd.MappedRDD.getPartitions(MappedRDD.scala:28)
        at org.apache.spark.rdd.RDD$anonfun$partitions$2.apply(RDD.scala:205)
        at org.apache.spark.rdd.RDD$anonfun$partitions$2.apply(RDD.scala:203)
        at scala.Option.getOrElse(Option.scala:120)
        at org.apache.spark.rdd.RDD.partitions(RDD.scala:203)
        at org.apache.spark.rdd.MappedRDD.getPartitions(MappedRDD.scala:28)
        at org.apache.spark.rdd.RDD$anonfun$partitions$2.apply(RDD.scala:205)
        at org.apache.spark.rdd.RDD$anonfun$partitions$2.apply(RDD.scala:203)
        at scala.Option.getOrElse(Option.scala:120)
        at org.apache.spark.rdd.RDD.partitions(RDD.scala:203)
        at org.apache.spark.SparkContext.runJob(SparkContext.scala:1351)
        at org.apache.spark.rdd.RDD.reduce(RDD.scala:867)
        at org.apache.spark.api.java.JavaRDDLike$class.reduce(JavaRDDLike.scala:346)
        at org.apache.spark.api.java.JavaRDD.reduce(JavaRDD.scala:32)
        at com.spark.gt.myspark.FirstSparkDemo.main(FirstSparkDemo.java:49)
        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:606)
        at org.apache.spark.deploy.SparkSubmit$.launch(SparkSubmit.scala:358)
        at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:75)
        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:739)
        at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
        at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:529)
        at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:493)
        at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:604)
        at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:699)
        at org.apache.hadoop.ipc.Client$Connection.access$2800(Client.java:367)
        at org.apache.hadoop.ipc.Client.getConnection(Client.java:1462)
        at org.apache.hadoop.ipc.Client.call(Client.java:1381)
        ... 49 more
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