[pipstat@PIPtest58 hadoop]$ bin/hadoop jar share/hadoop/mapreduce/sources/hadoop-mapreduce-examples-2.5.2-sources.jar org.apache.hadoop.examples.WordCount input output
16/03/15 20:14:25 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform… using builtin-java classes where applicable
16/03/15 20:14:25 INFO client.RMProxy: Connecting to ResourceManager at /192.168.0.58:8032
16/03/15 20:14:27 INFO input.FileInputFormat: Total input paths to process : 1
16/03/15 20:14:27 INFO mapreduce.JobSubmitter: number of splits:1
16/03/15 20:14:27 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1458043844347_0001
16/03/15 20:14:28 INFO impl.YarnClientImpl: Submitted application application_1458043844347_0001
16/03/15 20:14:28 INFO mapreduce.Job: The url to track the job: http://press5.cn:8088/proxy/application_1458043844347_0001/
16/03/15 20:14:28 INFO mapreduce.Job: Running job: job_1458043844347_0001
16/03/15 20:14:50 INFO mapreduce.Job: Job job_1458043844347_0001 running in uber mode : false
16/03/15 20:14:50 INFO mapreduce.Job: map 0% reduce 0%
16/03/15 20:14:50 INFO mapreduce.Job: Job job_1458043844347_0001 failed with state FAILED due to: Application application_1458043844347_0001 failed 2 times due to Error launching appattempt_1458043844347_0001_000002. Got exception: java.net.ConnectException: Call From PIPtest58/192.168.0.58 to press5.cn:45226 failed on connection exception: java.net.ConnectException: 拒绝连接; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
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:1415)
at org.apache.hadoop.ipc.Client.call(Client.java:1364)
at org.apache.hadoop.ipc.ProtobufRpcEngine
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Invoker.invoke(ProtobufRpcEngine.java:206) at com.sun.proxy.
Invoker.invoke(ProtobufRpcEngine.java:206)atcom.sun.proxy.Proxy78.startContainers(Unknown Source)
at org.apache.hadoop.yarn.api.impl.pb.client.ContainerManagementProtocolPBClientImpl.startContainers(ContainerManagementProtocolPBClientImpl.java:96)
at org.apache.hadoop.yarn.server.resourcemanager.amlauncher.AMLauncher.launch(AMLauncher.java:118)
at org.apache.hadoop.yarn.server.resourcemanager.amlauncher.AMLauncher.run(AMLauncher.java:249)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor
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Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: java.net.ConnectException: 拒绝连接 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) 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
Worker.run(ThreadPoolExecutor.java:617)atjava.lang.Thread.run(Thread.java:745)Causedby:java.net.ConnectException:拒绝连接atsun.nio.ch.SocketChannelImpl.checkConnect(NativeMethod)atsun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)atorg.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)atorg.apache.hadoop.net.NetUtils.connect(NetUtils.java:529)atorg.apache.hadoop.net.NetUtils.connect(NetUtils.java:493)atorg.apache.hadoop.ipc.ClientConnection.setupConnection(Client.java:606)
at org.apache.hadoop.ipc.Client
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Connection.setupIOstreams(Client.java:700) at org.apache.hadoop.ipc.Client
Connection.setupIOstreams(Client.java:700)atorg.apache.hadoop.ipc.ClientConnection.access$2800(Client.java:367)
at org.apache.hadoop.ipc.Client.getConnection(Client.java:1463)
at org.apache.hadoop.ipc.Client.call(Client.java:1382)
… 9 more
. Failing the application.
16/03/15 20:14:50 INFO mapreduce.Job: Counters: 0
解决方案：
/etc/host文件里
配置方法
ip地址 主机名 域名
ip地址 主机名 域名
ip地址 主机名 域名
说明：ip地址为第一列，主机名为第二列
如果域名也主机名写反了，就会出现上边的连接异常