Package com.linkedin.venice.stats

Class TehutiUtils.RatioStat

  • All Implemented Interfaces:
    io.tehuti.metrics.Measurable, io.tehuti.metrics.MeasurableStat, io.tehuti.metrics.NamedMeasurableStat, io.tehuti.metrics.Stat
    Enclosing class:
    TehutiUtils
    public static class TehutiUtils.RatioStat
extends LambdaStat
    Generate a ratio stat that is based on two arbitrary Rate. It calculates the proportion of one Stat over the sum of two Stats. This method is mostly used to calculate the bad request ratio (bad / (good + bad)) Use Rate instead of SampledStat to capture the event rate, so that the result won't get impacted by the un-aligned windows introduced by SampledStat. More background: SampledStat is not maintaining sliding windows based on absolute time, and the new window creation is triggered by new event, considering the event for different metrics could happen at different rate/time, the sliding-windows being used by different metrics will be different. In this case, if we want to emit the ratio of two metrics, the result won't reflect the actual data since the nominator could use the window starting from time: t1, and the denominator could use the window starting from time: t2. By using Rate, the ratio metric will be more reasonable since it doesn't depend on the actual window size/starting time, but the average event frequency. It is still not perfect, since both nominator and denominator metrics could still use different window size/starting time. The ultimate solution should be to use the consistent windowing (based on absolute time) across all the metrics.

    • Nested Class Summary

      • Nested classes/interfaces inherited from class io.tehuti.metrics.stats.AsyncGauge

        io.tehuti.metrics.stats.AsyncGauge.AsyncGaugeExecutor

    • Field Summary

      • Fields inherited from class io.tehuti.metrics.stats.AsyncGauge

        DEFAULT_ASYNC_GAUGE_EXECUTOR

    • Constructor Summary

      Constructors 
      Constructor Description
      RatioStat​(io.tehuti.metrics.stats.Rate one, io.tehuti.metrics.stats.Rate two, java.lang.String metricName)  

    • Method Summary

      • Methods inherited from class io.tehuti.metrics.stats.AsyncGauge

        getStatName, measure, record

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

      • Methods inherited from interface io.tehuti.metrics.Measurable

        measureWithExtraValue

    • Constructor Detail

      • RatioStat

        public RatioStat​(io.tehuti.metrics.stats.Rate one,
                 io.tehuti.metrics.stats.Rate two,
                 java.lang.String metricName)