MetricSampleQuantiles (Apache HBase 1.1.7 API)

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java.lang.Object
- org.apache.hadoop.metrics2.util.MetricSampleQuantiles

```
@InterfaceAudience.Private
public class MetricSampleQuantiles
extends Object
```
Implementation of the Cormode, Korn, Muthukrishnan, and Srivastava algorithm for streaming calculation of targeted high-percentile epsilon-approximate quantiles. This is a generalization of the earlier work by Greenwald and Khanna (GK), which essentially allows different error bounds on the targeted quantiles, which allows for far more efficient calculation of high-percentiles. See: Cormode, Korn, Muthukrishnan, and Srivastava "Effective Computation of Biased Quantiles over Data Streams" in ICDE 2005 Greenwald and Khanna, "Space-efficient online computation of quantile summaries" in SIGMOD 2001

Constructor Summary

Constructors
Constructor and Description

MetricSampleQuantiles(MetricQuantile[] quantiles)

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`clear()` Resets the estimator, clearing out all previously inserted items
`long`	`getCount()` Returns the number of items that the estimator has processed
`int`	`getSampleCount()` Returns the number of samples kept by the estimator
`void`	`insert(long v)` Add a new value from the stream.
`Map<MetricQuantile,Long>`	`snapshot()` Get a snapshot of the current values of all the tracked quantiles.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - MetricSampleQuantiles
```
public MetricSampleQuantiles(MetricQuantile[] quantiles)
```
- Method Detail
  - insert
```
public void insert(long v)
```
    Add a new value from the stream.
    
    Parameters:
    v -
  - snapshot
```
public Map<MetricQuantile,Long> snapshot()
                                  throws IOException
```
    Get a snapshot of the current values of all the tracked quantiles.
    
    Returns:
    snapshot of the tracked quantiles
    
    Throws:
    
    IOException - if no items have been added to the estimator
  - getCount
```
public long getCount()
```
    Returns the number of items that the estimator has processed
    
    Returns:
    count total number of items processed
  - getSampleCount
```
public int getSampleCount()
```
    Returns the number of samples kept by the estimator
    
    Returns:
    count current number of samples
  - clear
```
public void clear()
```
    Resets the estimator, clearing out all previously inserted items

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