Package com.linkedin.venice.stats

Class TehutiUtils.RatioStat

java.lang.Object
io.tehuti.metrics.stats.AsyncGauge
com.linkedin.venice.stats.LambdaStat
com.linkedin.venice.stats.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, 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 Details

    • RatioStat

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