WordCount案例报错log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory).
解决方法:
在resources文件夹中新建log4j.properties文件添加以下内容:
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
在WordCountDriver的main方法最前面添加以下代码
BasicConfigurator.configure(); //自动快速地使用缺省Log4j环境
问题就成功解决了!!