程序包org.apache.hadoop.log的分层结构

程序包分层结构:

• 所有程序包

类分层结构

• java.lang.Object
  • org.apache.log4j.AppenderSkeleton (implements org.apache.log4j.Appender, org.apache.log4j.spi.OptionHandler)
    • org.apache.hadoop.log.metrics.EventCounter
      • org.apache.hadoop.log.EventCounter
  • javax.servlet.GenericServlet (implements java.io.Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig)
    • javax.servlet.http.HttpServlet (implements java.io.Serializable)
      • org.apache.hadoop.log.LogLevel.Servlet
  • org.apache.hadoop.log.LogLevel