Hi Andrew, thanks for your reply. The metrics2 configuration is : *.sink.ganglia.class=org.apache.hadoop.metrics2.sink.ganglia.GangliaSink31 *.sink.ganglia.period=10 *.sink.ganglia.supportsparse=true namenode.sink.ganglia.servers=10.232.130.6:8649 datanodenode.sink.ganglia.servers=10.232.130.6:8649 journalnode.sink.ganglia.servers=10.232.130.6:8649
There is @Metric MutableCounterLong bytesWritten attribute in DataNodeMetrics, which is used to statistics written bytes per second on one DataNode, is that right? If the metric is not divided by 10 and is not reseted to zero per ten seconds, how does the metric statistics written bytes per second? Thanks, LiuLei 2013/11/21 Andrew Wang <andrew.w...@cloudera.com> > Hey LiuLei, > > Gauges can go up and down, counters only go up. Snapshot doesn't actually > reset anything, it's just a way for the metrics system to get an updated > value. There aren't any time-based rolling metrics to my knowledge besides > MutableQuantiles. > > Best, > Andrew > > > On Wed, Nov 20, 2013 at 7:34 PM, lei liu <liulei...@gmail.com> wrote: > > > I use cdh-4.3.1 version. I am reading the code about metrics2. > > > > There are COUNTER and GAUGE metric type in metrics v2. What is the > > difference > > between the two? > > > > > > There is @Metric MutableCounterLong bytesWritten attribute in > > DataNodeMetrics, which is used to statistics written bytes per second on > > DataNode.So I think the value of MutableCounterLong should be divided > > by 10and be reseted to zero per ten seconds in > > MutableCounterLong.snapshot > > method, is that right? But MutableCounterLong.snapshot method don't do > > that. I miss anything please tell me. > > > > Thanks, > > > > LiuLei > > >
