INFO metrics.MetricsUtil: Unable to obtain hostName_failed to obtain host name. the cmd is hostname-优快云博客

本文链接：https://blog.youkuaiyun.com/wangdong2017/article/details/89454664
本文记录了在运行Hadoop WordCount任务时遇到的主机名解析错误，详细展示了错误日志，并提供了检查hostname配置及/etc/hosts文件的解决思路。
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修改hostname时，也应该在/etc/hosts里修改对应的映射名称。。
[root@Node-01 hadoop-2.5.2]# hadoop jar ./share/hadoop/mapreduce/hadoop-mapreduce-examples-2.5.2.jar wordcount /home/input/ /home/output
Java HotSpot(TM) Client VM warning: You have loaded library /usr/local/hadoop-2.5.2/lib/native/libhadoop.so.1.0.0 which might have disabled stack guard. The VM will try to fix the stack guard now.
It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.
19/04/23 00:11:07 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
19/04/23 00:11:07 INFO Configuration.deprecation: session.id is deprecated. Instead, use dfs.metrics.session-id
19/04/23 00:11:07 INFO jvm.JvmMetrics: Initializing JVM Metrics with processName=JobTracker, sessionId=
19/04/23 00:11:07 INFO metrics.MetricsUtil: Unable to obtain hostName
java.net.UnknownHostException: Node-01: Node-01
	at java.net.InetAddress.getLocalHost(InetAddress.java:1473)
	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:1255)
	at org.apache.hadoop.mapreduce.Job$9.run(Job.java:1251)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:415)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1614)
	at org.apache.hadoop.mapreduce.Job.connect(Job.java:1250)
	at org.apache.hadoop.mapreduce.Job.submit(Job.java:1279)
	at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1303)
	at org.apache.hadoop.examples.WordCount.main(WordCount.java:87)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:72)
	at org.apache.hadoop.util.ProgramDriver.run(ProgramDriver.java:145)
	at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:74)
	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.util.RunJar.main(RunJar.java:212)
Caused by: java.net.UnknownHostException: Node-01
	at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
	at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:901)
	at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1293)
	at java.net.InetAddress.getLocalHost(InetAddress.java:1469)
	... 33 more
19/04/23 00:11:08 INFO metrics.MetricsUtil: Unable to obtain hostName
java.net.UnknownHostException: Node-01: Node-01
	at java.net.InetAddress.getLocalHost(InetAddress.java:1473)
	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:1255)
	at org.apache.hadoop.mapreduce.Job$9.run(Job.java:1251)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:415)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1614)
	at org.apache.hadoop.mapreduce.Job.connect(Job.java:1250)
	at org.apache.hadoop.mapreduce.Job.submit(Job.java:1279)
	at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1303)
	at org.apache.hadoop.examples.WordCount.main(WordCount.java:87)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:72)
	at org.apache.hadoop.util.ProgramDriver.run(ProgramDriver.java:145)
	at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:74)
	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.util.RunJar.main(RunJar.java:212)
Caused by: java.net.UnknownHostException: Node-01
	at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
	at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:901)
	at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1293)
	at java.net.InetAddress.getLocalHost(InetAddress.java:1469)
	... 30 more
java.net.UnknownHostException: Node-01: Node-01
	at java.net.InetAddress.getLocalHost(InetAddress.java:1473)
	at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:350)
	at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1285)
	at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1282)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:415)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1614)
	at org.apache.hadoop.mapreduce.Job.submit(Job.java:1282)
	at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1303)
	at org.apache.hadoop.examples.WordCount.main(WordCount.java:87)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:72)
	at org.apache.hadoop.util.ProgramDriver.run(ProgramDriver.java:145)
	at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:74)
	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.util.RunJar.main(RunJar.java:212)
Caused by: java.net.UnknownHostException: Node-01
	at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
	at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:901)
	at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1293)
	at java.net.InetAddress.getLocalHost(InetAddress.java:1469)
	... 21 more
[root@Node-01 hadoop-2.5.2]# hostname
Node-01
[root@Node-01 hadoop-2.5.2]# vi /etc/hosts
[root@Node-01 hadoop-2.5.2]# vi /etc/sysconfig/network
[root@Node-01 hadoop-2.5.2]# vi /etc/hosts