Could not find or load main class org.apache.hadoop.mapreduce.v2.app.MRAppMaster

[转行大数据]

Could not find or load main class org.apache.hadoop.mapreduce.v2.app.MRAppMaster

Please check whether your etc/hadoop/mapred-site.xml contains the below configuration:
<property>
<name>yarn.app.mapreduce.am.env</name>
<value>HADOOP_MAPRED_HOME=${full path of your hadoop distribution directory}</value>
</property>
<property>
<name>mapreduce.map.env</name>
<value>HADOOP_MAPRED_HOME=${full path of your hadoop distribution directory}</value>
</property>
<property>
<name>mapreduce.reduce.env</name>
<value>HADOOP_MAPRED_HOME=${full path of your hadoop distribution directory}</value>
</property>

For more detailed output, check the application tracking page: http://hdp001:8088/cluster/app/application_1526376633269_0001 Then click on links to logs of each attempt.
. Failing the application.

mapred-site.xml 不太会配置，希望大家帮忙解答。这个直接写和/etc/profile下的环境变量$HADOOP_HOME不行，直接写绝对路径/root/apps/hadoop3.0.1/也不行

mapred-site.xml
<configuration>
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
<property>
<name>mapreduce.admin.user.env</name>
<value>HADOOP_MAPRED_HOME=$HADOOP_HOME</value>
</property>
<property>
<name>yarn.app.mapreduce.am.env</name>
<value>HADOOP_MAPRED_HOME=$HADOOP_HOME</value>
</property>
</configuration>

[dekinle]

你先确认你有没有写入 HADOOP_HOME 这个系统变量。

如果不行，直接写上系统安装路径。

[岂曰无衣与子同袍]

我也遇到了这个问题，当我从windows端向集群的yarn提交job的时候出现这个问题，配置完提示检查的三个参数，重新运行的时候并没有用。