@Public @Evolving

Package org.apache.hadoop.metrics2.lib

A collection of library classes for implementing metrics sources

Class Summary

Class	Description
Interns	Helpers to create interned metrics info.
MetricsAnnotations	Metrics annotation helpers.
MetricsRegistry	An optional metrics registry class for creating and maintaining a collection of MetricsMutables, making writing metrics source easier.
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
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
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.
UniqueNames	Generates predictable and user-friendly unique names

Enum Summary

Enum	Description
DefaultMetricsFactory	Experimental interface to extend metrics dynamically
DefaultMetricsSystem	The default metrics system singleton.