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[GitHub] [incubator-skywalking] wu-sheng commented on issue #2410: What will makes CPM less than the real

wu-sheng commented on issue #2410: What will makes CPM less than the real 
URL: https://github.com/apache/incubator-skywalking/issues/2410#issuecomment-477379847
 
 
   > I see that the DataCarrier in TraceSegmentServiceClient uses BufferStrategy.IF_POSSIBLE, so some segment will lose if there is too many segments to send. So is there other situations in which segment will lose?
   
   No. 
   
   > If I change the sampleRate from 1000 to 100, only payload of segment persisting will reduce to 10%, right?
   
   If you are saying client sampling, yes. Also the metric values lose 90%.
   
   > How many CPM can one backend server load(Simply 8 cpu), and how can I compute how many backend servers should the cluster include?
   
   Depend on ElasticSearch performance. 8 CPU could reach 5k/s at least.

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