class Jaeger::Samplers::GuaranteedThroughputProbabilistic

A sampler that leverages both Probabilistic sampler and RateLimiting sampler. The RateLimiting is used as a guaranteed lower bound sampler such that every operation is sampled at least once in a time interval defined by the lower_bound. ie a lower_bound of 1.0 / (60 * 10) will sample an operation at least once every 10 minutes.

The Probabilistic sampler is given higher priority when tags are emitted, ie. if is_sampled() for both samplers return true, the tags for Probabilistic sampler will be used.

Attributes

lower_bound_sampler[R]
probabilistic_sampler[R]
tags[R]

Public Class Methods

new(lower_bound:, rate:, lower_bound_sampler: nil) click to toggle source
# File lib/jaeger/samplers/guaranteed_throughput_probabilistic.rb, line 17
def initialize(lower_bound:, rate:, lower_bound_sampler: nil)
  @probabilistic_sampler = Probabilistic.new(rate: rate)
  @lower_bound_sampler = lower_bound_sampler || RateLimiting.new(max_traces_per_second: lower_bound)
  @lower_bound_tags = {
    'sampler.type' => 'lowerbound',
    'sampler.param' => rate
  }
end

Public Instance Methods

sample(*args) click to toggle source
# File lib/jaeger/samplers/guaranteed_throughput_probabilistic.rb, line 33
def sample(*args)
  is_sampled, probabilistic_tags = @probabilistic_sampler.sample(*args)
  if is_sampled
    # We still call lower_bound_sampler to update the rate limiter budget
    @lower_bound_sampler.sample(*args)

    return [is_sampled, probabilistic_tags]
  end

  is_sampled, _tags = @lower_bound_sampler.sample(*args)
  [is_sampled, @lower_bound_tags]
end
update(lower_bound:, rate:) click to toggle source
# File lib/jaeger/samplers/guaranteed_throughput_probabilistic.rb, line 26
def update(lower_bound:, rate:)
  is_updated = @probabilistic_sampler.update(rate: rate)
  is_updated = @lower_bound_sampler.update(max_traces_per_second: lower_bound) || is_updated
  @lower_bound_tags['sampler.param'] = rate
  is_updated
end