Could not find or load main class org.apache.hadoop.hdfs.server.namenode.NameNode

这是Hadoop中目录share/hadoop中找不到hdfs文件夹中的jar包

[root@master hadoop]# bin/hdfs namenode -formatError: Could not find or load main class org.apache.hadoop.hdfs.server.namenode.NameNode

可以用hadoop classpath检查导出的类

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