hadoop 3.1.1 Could not find or load main class org.apache.hadoop.mapreduce.v2.app.MRAppMaster

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啟動hdfs後執行share目錄中內建的mapreduce程式時報如下錯誤

 

找到$HADOOP_HOME/etc/mapred-site.xml,增加以下配置

 1 <property> 2   <name>yarn.app.mapreduce.am.env</name> 3   <value>HADOOP_MAPRED_HOME=${HADOOP_HOME}</value> 4 </property> 5 <property> 6   <name>mapreduce.map.env</name> 7   <value>HADOOP_MAPRED_HOME=${HADOOP_HOME}</value> 8 </property> 9 <property>10   <name>mapreduce.reduce.env</name>11   <value>HADOOP_MAPRED_HOME=${HADOOP_HOME}</value>12 </property>

 

hadoop 3.1.1 Could not find or load main class org.apache.hadoop.mapreduce.v2.app.MRAppMaster