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peaksnail / pinpoint-node-agent

pinpoint agent for nodejs
Apache License 2.0
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isSampling #13

Closed jiaojiaojiao closed 7 years ago

jiaojiaojiao commented 7 years ago 
SamplingRateSampler.prototype.isSampling = function () {

  var samplingCount = this.counter > MAX_INTEGER ? (this.counter = 1) && 0 : this.counter++;
  var isSampling = samplingCount % this.samplingRate;
  return isSampling === 0;

};

this.samplingRate为1的时候，表示采样率为100%，为0.5的时候表示采样率为50％，那么如果采样率为0.5的时候，上面函数永远返回true

peaksnail commented 7 years ago

额，50%的采集率，需要设置samplingRate为2，samplingRate 为整数N，采集率为 1/N，所以设置0.5 ，采集率实际上是1.