| Package | Description | 
|---|---|
| org.apache.hadoop.metrics2.lib | A collection of library classes for implementing metrics sources | 
| org.apache.hadoop.metrics2.util | General helpers for implementing source and sinks | 
| Class and Description | 
|---|
| QuantileEstimator | 
| Class and Description | 
|---|
| MetricsCache.Record Cached record | 
| SampleStat.MinMax Helper to keep running min/max | 
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