在Hadoop 2上运行作业时无法初始化集群异常

  • Z时代
  • 2024-01-10
  • 分类：问答

所有守护程序都在运行，jps显示：

6663 JobHistoryServer
7213 ResourceManager
9235 Jps
6289 DataNode
6200 NameNode
7420 NodeManager

但是wordcount示例继续失败，并带有以下异常：

ERROR security.UserGroupInformation: PriviledgedActionException as:root (auth:SIMPLE) cause:java.io.IOException: Cannot initialize Cluster. Please check your configuration for mapreduce.framework.name and the correspond server addresses.
Exception in thread "main" java.io.IOException: Cannot initialize Cluster. Please check your configuration for mapreduce.framework.name and the correspond server addresses.
    at org.apache.hadoop.mapreduce.Cluster.initialize(Cluster.java:120)
    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:1238)
    at org.apache.hadoop.mapreduce.Job$9.run(Job.java:1234)
    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:1491)
    at org.apache.hadoop.mapreduce.Job.connect(Job.java:1233)
    at org.apache.hadoop.mapreduce.Job.submit(Job.java:1262)
    at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1286)
    at WordCount.main(WordCount.java:80)
    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)

因为它说问题出在配置中，所以我在这里发布配置文件。目的是创建一个单节点群集。

<?xml version="1.0"?>
 <configuration>
<property>
   <name>yarn.nodemanager.aux-services</name>
   <value>mapreduce_shuffle</value>
</property>
<property>
   <name>yarn.nodemanager.aux-services.mapreduce.shuffle.class</name>
   <value>org.apache.hadoop.mapred.ShuffleHandler</value>
</property>
</configuration>

<configuration>
<property>
   <name>fs.default.name</name>
   <value>hdfs://localhost:9000</value>
</property>
</configuration>

 <configuration>
 <property>
   <name>dfs.replication</name>
   <value>1</value>
 </property>
 <property>
   <name>dfs.namenode.name.dir</name>
   <value>file:/home/hduser/yarn/yarn_data/hdfs/namenode</value>
 </property>
 <property>
   <name>dfs.datanode.data.dir</name>
   <value>file:/home/hduser/yarn/yarn_data/hdfs/datanode</value>
 </property>
 </configuration>

<configuration>
  <property>
      <name>mapreduce.framework.name</name>
      <value>Yarn</value>
  </property>
</configuration>

请告诉我们缺少了什么或我在做什么错。

回答：

您使用大写字母Yarn，这可能是为什么它无法解决的原因。尝试使用官方文档中建议的小写版本。

<configuration>
  <property>
      <name>mapreduce.framework.name</name>
      <value>yarn</value>
  </property>
</configuration>

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