mbao commented on issue #2410: What will makes CPM less than the real URL: https://github.com/apache/incubator-skywalking/issues/2410#issuecomment-477447675 > > 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%. I mean sampleRate for backend . I think sample_n_per_3_secs is the only parameter for me to change the sample rate in agent client, right? What do you mean by metric values? I think CPM value is still the exact value as sampleRate just impacts SegmentSpanListener for segment persistence. > > > 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. What about mysql? I think mysql is not optimized . Thank you very much.
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