Exception in thread "main" java.lang.Exception: When running with master 'yarn' either

Exception in thread "main" java.lang.Exception: When running with master 'yarn' either HADOOP_CONF_DIR or YARN_CONF_DIR must be set in the environment.   上面中的錯誤是HADOOP_CONF_DIR和YARN_CONF_DIR沒有設置在環境變量中

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