hadoop大数据执行数据分析时报错错误: 找不到或无法加载主类 org.apache.hadoop.mapreduce.v2.app.MRAppMaster的解决办法

1、报错信息

2020-06-19 21:51:37.008]Container exited with a non-zero exit code 1. Error file: prelaunch.err.
Last 4096 bytes of prelaunch.err :
Last 4096 bytes of stderr :
错误: 找不到或无法加载主类 org.apache.hadoop.mapreduce.v2.app.MRAppMaster


[2020-06-19 21:51:37.008]Container exited with a non-zero exit code 1. Error file: prelaunch.err.
Last 4096 bytes of prelaunch.err :
Last 4096 bytes of stderr :
错误: 找不到或无法加载主类 org.apache.hadoop.mapreduce.v2.app.MRAppMaster

原因分析：

这是由于hadoop3.0的框架文件yarn-site.xml需要配置value，value配置错误导致

解决办法：查看变量

[hadoop@namenode ~]$ hadoop classpath
/hadoop/hadoop-3.0.0/etc/hadoop:/hadoop/hadoop-3.0.0/share/hadoop/common/lib/*:/hadoop/hadoop-3.0.0/share/hadoop/common/*:/hadoop/hadoop-3.0.0/share/hadoop/hdfs:/hadoop/hadoop-3.0.0/share/hadoop/hdfs/lib/*:/hadoop/hadoop-3.0.0/share/hadoop/hdfs/*:/hadoop/hadoop-3.0.0/share/hadoop/mapreduce/*:/hadoop/hadoop-3.0.0/share/hadoop/yarn:/hadoop/hadoop-3.0.0/share/hadoop/yarn/lib/*:/hadoop/hadoop-3.0.0/share/hadoop/yarn/*

添加到yarn-site.xml的value里面中

<configuration>

<!-- Site specific YARN configuration properties -->
<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>

 <property>
    <name>yarn.resourcemanager.address</name>
    <value>namenode:8032</value>
 </property>

 <property>
     <name>yarn.resourcemanager.scheduler.address</name>
         <value>namenode:8030</value>
 </property>

 <property>
     <name>yarn.resourcemanager.resource-tracker.address</name>
     <value>namenode:8031</value>
 </property>

 <property>
    <name>yarn.resourcemanager.admin.address</name>
    <value>namenode:8033</value>
 </property>

 <property>
    <name>yarn.resourcemanager.webapp.address</name>
 <value>namenode:8088</value>
 </property>
<property>
<name>yarn.application.classpath</name>
<value>/hadoop/hadoop-3.0.0/etc/hadoop:/hadoop/hadoop-3.0.0/share/hadoop/common/lib/*:/hadoop/hadoop-3.0.0/share/hadoop/common/*:/hadoop/hadoop-3.0.0/share/hadoop/hdfs:/hadoop/hadoop-3.0.0/share/hadoop/hdfs/lib/*:/hadoop/hadoop-3.0.0/share/hadoop/hdfs/*:/hadoop/hadoop-3.0.0/share/hadoop/mapreduce/*:/hadoop/hadoop-3.0.0/share/hadoop/yarn:/hadoop/hadoop-3.0.0/share/hadoop/yarn/lib/*:/hadoop/hadoop-3.0.0/share/hadoop/yarn/*</value>
</property>
</configuration>

修改完成之后重启集群即可。

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