Call From hadoop102/192.168.10.102 to hadoop102:8020 failed on connection exception: java.net.Connec

Call From hadoop102/192.168.10.102 to hadoop102:8020 failed on connection exception: java.net.ConnectException: 拒绝连接;
2021-03-20 08:41:20,294 INFO client.RMProxy: Connecting to ResourceManager at hadoop103/192.168.10.103:8032 java.net.ConnectException: Call From hadoop102/192.168.10.102 to hadoop102:8020 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:423) at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:831) at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:755) at org.apache.hadoop.ipc.Client.getRpcResponse(Client.java:1549) at org.apache.hadoop.ipc.Client.call(Client.java:1491) at org.apache.hadoop.ipc.Client.call(Client.java:1388) at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:233) at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:118) at com.sun.proxy.$Proxy9.getFileInfo(Unknown Source) at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:904) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:422) at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeMethod(RetryInvocationHandler.java:165) at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invoke(RetryInvocationHandler.java:157) at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeOnce(RetryInvocationHandler.java:95) at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:359) at com.sun.proxy.$Proxy10.getFileInfo(Unknown Source) at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:1661) at org.apache.hadoop.hdfs.DistributedFileSystem$29.doCall(DistributedFileSystem.java:1577) at org.apache.hadoop.hdfs.DistributedFileSystem$29.doCall(DistributedFileSystem.java:1574) at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81) at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1589) at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1683) at org.apache.hadoop.mapreduce.lib.output.FileOutputFormat.checkOutputSpecs(FileOutputFormat.java:163) at org.apache.hadoop.mapreduce.JobSubmitter.checkSpecs(JobSubmitter.java:277) at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:143) at org.apache.hadoop.mapreduce.Job$11.run(Job.java:1570) at org.apache.hadoop.mapreduce.Job$11.run(Job.java:1567) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:422) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1729) at org.apache.hadoop.mapreduce.Job.submit(Job.java:1567) at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1588) at org.apache.hadoop.examples.WordCount.main(WordCount.java:87) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:71) at org.apache.hadoop.util.ProgramDriver.run(ProgramDriver.java:144) at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:74) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.hadoop.util.RunJar.run(RunJar.java:318) at org.apache.hadoop.util.RunJar.main(RunJar.java:232) 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:531) at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:700) at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:804) at org.apache.hadoop.ipc.Client$Connection.access$3800(Client.java:421) at org.apache.hadoop.ipc.Client.getConnection(Client.java:1606) at org.apache.hadoop.ipc.Client.call(Client.java:1435) ... 45 mor
错因：未知
解决方案：
1.关闭集群

[atguigu@hadoop102 hadoop-3.1.3]$ myhadoop.sh stop
 =================== 关闭 hadoop 集群 ===================
 --------------- 关闭 historyserver ---------------
WARNING: historyserver did not stop gracefully after 5 seconds: Trying to kill with kill -9
 --------------- 关闭 yarn ---------------
Stopping nodemanagers
Stopping resourcemanager
 --------------- 关闭 hdfs ---------------
Stopping namenodes on [hadoop102]
Stopping datanodes
Stopping secondary namenodes [hadoop104]
[atguigu@hadoop102 hadoop-3.1.3]$ jpsall
=============== hadoop102 ===============
6351 Jps
=============== hadoop103 ===============
4811 Jps
=============== hadoop104 ===============
3864 Jps
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2.删除hadoop集群下的所有data/ logs/文件夹

[atguigu@hadoop103 hadoop-3.1.3]$ rm -rf data/  logs/
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3.格式化namenode

[atguigu@hadoop102 hadoop-3.1.3]$ hdfs namenode -format

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4.重启集群

[atguigu@hadoop102 hadoop-3.1.3]$ myhadoop.sh start
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5.测试问题是否解决
数据上传到集群，便于后边的测试

[atguigu@hadoop102 hadoop-3.1.3]$ hadoop fs -mkdir /input
[atguigu@hadoop102 wcinput]$ hadoop fs -put word.txt /input
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测试

[atguigu@hadoop102 hadoop-3.1.3]$ hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-3.1.3.jar wordcount /input /output1
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6.问题解决

2021-03-20 08:50:11,382 INFO mapreduce.Job: Job job_1616201068090_0002 completed successfully

参考：https://blog.csdn.net/qq_43668173/article/details/115021479