Package org.apache.hadoop.metrics2.lib

@Public @Evolving package org.apache.hadoop.metrics2.lib
A collection of library classes for implementing metrics sources
  • Class
    Description
    org.apache.hadoop.metrics2.lib.DefaultMetricsFactory
    Experimental interface to extend metrics dynamically
    DefaultMetricsSystem
    The default metrics system singleton.
    Interns
    Helpers to create interned metrics info.
    org.apache.hadoop.metrics2.lib.MetricsAnnotations
    Metrics annotation helpers.
    MetricsRegistry
    An optional metrics registry class for creating and maintaining a collection of MetricsMutables, making writing metrics source easier.
    org.apache.hadoop.metrics2.lib.MetricsSourceBuilder
    Helper class to build MetricsSource object from annotations.
    MutableCounter
    The mutable counter (monotonically increasing) metric interface
    MutableCounterInt
    A mutable int counter for implementing metrics sources
    MutableCounterLong
    A mutable long counter
    MutableGauge
    The mutable gauge metric interface
    org.apache.hadoop.metrics2.lib.MutableGaugeFloat
    A mutable float gauge.
    MutableGaugeInt
    A mutable int gauge
    MutableGaugeLong
    A mutable long gauge
    MutableInverseQuantiles
    Watches a stream of long values, maintaining online estimates of specific quantiles with provably low error bounds.
    MutableMetric
    The mutable metric interface
    org.apache.hadoop.metrics2.lib.MutableMetricsFactory
     
    MutableQuantiles
    Watches a stream of long values, maintaining online estimates of specific quantiles with provably low error bounds.
    MutableRate
    A convenient mutable metric for throughput measurement
    MutableRates
    Helper class to manage a group of mutable rate metrics This class synchronizes all accesses to the metrics it contains, so it should not be used in situations where there is high contention on the metrics.
    MutableRatesWithAggregation
    Helper class to manage a group of mutable rate metrics.
    MutableRollingAverages
    This class maintains a group of rolling average metrics.
    MutableStat
    A mutable metric with stats.
    org.apache.hadoop.metrics2.lib.UniqueNames
    Generates predictable and user-friendly unique names