錯誤: 找不到或無法加載主類 org.apache.hadoop.mapreduce.v2.app.MRAppMaster

錯誤信息:  Container exited with a non-zero exit code 1. Error file: prelaunch.err. Last 4096 bytes of prelaunch.err : Last 4096 bytes of stderr : 錯誤: 找不到或無法加載主類 org.apache.hadoop.mapreduce.v2.app.MRAppMa
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