hadoop本地案例主机报错

解决办法：使用如下命令查看hostname是否一致

vim /etc/sysconfig/network
vim /etc/hosts

如果不一致，请改为一致就好了。

报错内容：

bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.2.jar grep input output 'dfs[a-z.]+'
19/08/04 21:19:17 INFO Configuration.deprecation: session.id is deprecated. Instead, use dfs.metrics.session-id
19/08/04 21:19:17 INFO jvm.JvmMetrics: Initializing JVM Metrics with processName=JobTracker, sessionId=
19/08/04 21:19:17 INFO metrics.MetricsUtil: Unable to obtain hostName
java.net.UnknownHostException: hadoop101: hadoop101: 未知的名称或服务
   at java.net.InetAddress.getLocalHost(InetAddress.java:1505)
   at org.apache.hadoop.metrics.MetricsUtil.getHostName(MetricsUtil.java:95)
   at org.apache.hadoop.metrics.MetricsUtil.createRecord(MetricsUtil.java:84)
   at org.apache.hadoop.metrics.jvm.JvmMetrics.<init>(JvmMetrics.java:87)
   at org.apache.hadoop.metrics.jvm.JvmMetrics.init(JvmMetrics.java:78)
   at org.apache.hadoop.metrics.jvm.JvmMetrics.init(JvmMetrics.java:65)
   at org.apache.hadoop.mapred.LocalJobRunnerMetrics.<init>(LocalJobRunnerMetrics.java:40)
   at org.apache.hadoop.mapred.LocalJobRunner.<init>(LocalJobRunner.java:714)
   at org.apache.hadoop.mapred.LocalJobRunner.<init>(LocalJobRunner.java:707)
   at org.apache.hadoop.mapred.LocalClientProtocolProvider.create(LocalClientProtocolProvider.java:42)
   at org.apache.hadoop.mapreduce.Cluster.initialize(Cluster.java:95)
   at org.apache.hadoop.mapreduce.Cluster.<init>(Cluster.java:82)
   at org.apache.hadoop.mapreduce.Cluster.<init>(Cluster.java:75)
   at org.apache.hadoop.mapreduce.Job$9.run(Job.java:1260)
   at org.apache.hadoop.mapreduce.Job$9.run(Job.java:1256)
   at java.security.AccessController.doPrivileged(Native Method)
   at javax.security.auth.Subject.doAs(Subject.java:422)
   at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
   at org.apache.hadoop.mapreduce.Job.connect(Job.java:1255)
   at org.apache.hadoop.mapreduce.Job.submit(Job.java:1284)
   at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1308)
   at org.apache.hadoop.examples.Grep.run(Grep.java:78)
   at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
   at org.apache.hadoop.examples.Grep.main(Grep.java:103)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at org.apache.hadoop.util.ProgramDriver$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:221)
   at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
Caused by: java.net.UnknownHostException: hadoop101: 未知的名称或服务
   at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
   at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)
   at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)
   at java.net.InetAddress.getLocalHost(InetAddress.java:1500)
   ... 36 more
19/08/04 21:19:17 INFO metrics.MetricsUtil: Unable to obtain hostName
java.net.UnknownHostException: hadoop101: hadoop101: 未知的名称或服务
   at java.net.InetAddress.getLocalHost(InetAddress.java:1505)
   at org.apache.hadoop.metrics.MetricsUtil.getHostName(MetricsUtil.java:95)
   at org.apache.hadoop.metrics.MetricsUtil.createRecord(MetricsUtil.java:84)
   at org.apache.hadoop.mapred.LocalJobRunnerMetrics.<init>(LocalJobRunnerMetrics.java:44)
   at org.apache.hadoop.mapred.LocalJobRunner.<init>(LocalJobRunner.java:714)
   at org.apache.hadoop.mapred.LocalJobRunner.<init>(LocalJobRunner.java:707)
   at org.apache.hadoop.mapred.LocalClientProtocolProvider.create(LocalClientProtocolProvider.java:42)
   at org.apache.hadoop.mapreduce.Cluster.initialize(Cluster.java:95)
   at org.apache.hadoop.mapreduce.Cluster.<init>(Cluster.java:82)
   at org.apache.hadoop.mapreduce.Cluster.<init>(Cluster.java:75)
   at org.apache.hadoop.mapreduce.Job$9.run(Job.java:1260)
   at org.apache.hadoop.mapreduce.Job$9.run(Job.java:1256)
   at java.security.AccessController.doPrivileged(Native Method)
   at javax.security.auth.Subject.doAs(Subject.java:422)
   at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
   at org.apache.hadoop.mapreduce.Job.connect(Job.java:1255)
   at org.apache.hadoop.mapreduce.Job.submit(Job.java:1284)
   at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1308)
   at org.apache.hadoop.examples.Grep.run(Grep.java:78)
   at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
   at org.apache.hadoop.examples.Grep.main(Grep.java:103)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at org.apache.hadoop.util.ProgramDriver$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:221)
   at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
Caused by: java.net.UnknownHostException: hadoop101: 未知的名称或服务
   at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
   at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)
   at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)
   at java.net.InetAddress.getLocalHost(InetAddress.java:1500)
   ... 33 more
java.net.UnknownHostException: hadoop101: hadoop101: 未知的名称或服务
   at java.net.InetAddress.getLocalHost(InetAddress.java:1505)
   at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:146)
   at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1290)
   at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1287)
   at java.security.AccessController.doPrivileged(Native Method)
   at javax.security.auth.Subject.doAs(Subject.java:422)
   at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
   at org.apache.hadoop.mapreduce.Job.submit(Job.java:1287)
   at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1308)
   at org.apache.hadoop.examples.Grep.run(Grep.java:78)
   at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
   at org.apache.hadoop.examples.Grep.main(Grep.java:103)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at org.apache.hadoop.util.ProgramDriver$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:221)
   at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
Caused by: java.net.UnknownHostException: hadoop101: 未知的名称或服务
   at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
   at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)
   at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)
   at java.net.InetAddress.getLocalHost(InetAddress.java:1500)
   ... 24 more

hadoop本地案例主机报错

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