关于首次运行Hadoop的Grep案例时出现的错误

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发布于 2020-04-20 14:50:37

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发布于 2020-04-20 14:50:37

文章被收录于专栏：细嗅蔷薇

语句如下：

bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.2.jar grep input output 'dfs[a-z.]+'

其错误信息如下：

19/05/14 18:26:35 INFO Configuration.deprecation: session.id is deprecated. Instead, use dfs.metrics.session-id
19/05/14 18:26:35 INFO jvm.JvmMetrics: Initializing JVM Metrics with processName=JobTracker, sessionId=
19/05/14 18:26:55 INFO metrics.MetricsUtil: Unable to obtain hostName
java.net.UnknownHostException:  hadoop101:  hadoop101: Temporary failure in name resolution
    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: Temporary failure in name resolution
    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
19/05/14 18:27:15 INFO metrics.MetricsUtil: Unable to obtain hostName
java.net.UnknownHostException:  hadoop101:  hadoop101: Temporary failure in name resolution
    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: Temporary failure in name resolution
    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: Temporary failure in name resolution
    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: Temporary failure in name resolution
    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

重点关注这句“19/05/14 18:26:55 INFO metrics.MetricsUtil: Unable to obtain hostName

java.net.UnknownHostException: hadoop101: hadoop101: Temporary failure in name resolution”，其为hostname可能存在问题，因此去查看/etc/sysconfig/network文件和/etc/hosts文件，发现其network文件中的“HOSTNAME=”后多打了一个空格，把其去掉，即可，问题解决

本文标题：《关于首次运行Hadoop的Grep案例时出现的错误》

本文链接：https://cloud.tencent.com/developer/article/1616864

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原始发表：2019-05-16，如有侵权请联系 cloudcommunity@tencent.com 删除

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