log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFa)

报错：
解决办法：
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

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

3、结果：

参考链接：https://stackoverflow.com/questions/33897307/hadoop-log4j-not-working-as-no-appenders-could-be-found-for-logger-org-apache-h