log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFact
2020-07-14 00:43
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报错：
1、在src/main/resources目录下创建log4j.properties
内容：
hadoop.root.logger=DEBUG, console
log4j.rootLogger = DEBUG, console
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.target=System.out
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=%d{yy/MM/dd HH:mm:ss} %p %c{2}: %m%n- 1
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2、在main函数的入口处加入：
BasicConfigurator.configure(); //自动快速地使用缺省Log4j环境
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