@Public @Evolving

Package org.apache.hadoop.metrics2.util

General helpers for implementing source and sinks

Interface Summary

Interface	Description
QuantileEstimator

Class Summary

Class	Description
Contracts	Additional helpers (besides guava Preconditions) for programming by contract
MBeans	This util class provides a method to register an MBean using our standard naming convention as described in the doc for {link MBeans.register(String, String, Object).
Metrics2Util	Utility class to simplify creation of hadoop metrics2 source/sink.
Metrics2Util.NameValuePair	A pair of a name and its corresponding value.
Metrics2Util.TopN	A fixed-size priority queue, used to retrieve top-n of offered entries.
MetricsCache	A metrics cache for sinks that don't support sparse updates.
MetricsCache.Record	Cached record
Quantile	Specifies a quantile (with error bounds) to be watched by a SampleQuantiles object.
SampleQuantiles	Implementation of the Cormode, Korn, Muthukrishnan, and Srivastava algorithm for streaming calculation of targeted high-percentile epsilon-approximate quantiles.
SampleStat	Helper to compute running sample stats
SampleStat.MinMax	Helper to keep running min/max
Servers	Helpers to handle server addresses