Flume 内置统计
prerequisite: JMXhttp://www.cnblogs.com/itech/archive/2010/09/16/1827999.html http://download.oracle.com/technetwork/java/javase/6/docs/zh/api/java/lang/management/ManagementFactory.html主要3个包：org.apache.flume.instrumentation、org.apache.flume.instrumentation.http和org.apache.flume.instrumentation.util
3个统计类：SourceCounter、ChannelCounter和SinkCounter
都继承了：MonitoredCounterGroup， 分别实现了：SourceCounterMBean、ChannelCounterMBean和SinkCounterMBean
另外还有个CounterGroup类：应该是每个组件的统计数据，包含name，和HashMap<k,v> counters . 配置文件中有个MyMemChannel, name就是MyMemChannel， <k,v> 有 <received_events, long> 等等吧 ？？？
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