MetricMutableQuantiles (Apache HBase 1.2.12 API)

All Classes

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Method

Detail:
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java.lang.Object
- org.apache.hadoop.metrics2.lib.MutableMetric
- - org.apache.hadoop.metrics2.lib.MetricMutableQuantiles

All Implemented Interfaces:

MetricHistogram
```
@InterfaceAudience.Private
public class MetricMutableQuantiles
extends org.apache.hadoop.metrics2.lib.MutableMetric
implements MetricHistogram
```
Watches a stream of long values, maintaining online estimates of specific quantiles with provably low error bounds. This is particularly useful for accurate high-percentile (e.g. 95th, 99th) latency metrics.

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`private static class`	`MetricMutableQuantiles.RolloverSample` Runnable used to periodically roll over the internal `MetricSampleQuantiles` every interval.

Field Summary

Fields
Modifier and Type	Field and Description
`private MetricSampleQuantiles`	`estimator`
`private MetricsExecutor`	`executor`
`private int`	`interval`
`private org.apache.hadoop.metrics2.MetricsInfo`	`numInfo`
`private long`	`previousCount`
`protected Map<MetricQuantile,Long>`	`previousSnapshot`
`private org.apache.hadoop.metrics2.MetricsInfo[]`	`quantileInfos`
`(package private) static MetricQuantile[]`	`quantiles`

Fields inherited from interface org.apache.hadoop.metrics2.MetricHistogram
MAX_METRIC_NAME, MEAN_METRIC_NAME, MEDIAN_METRIC_NAME, MIN_METRIC_NAME, NINETIETH_PERCENTILE_METRIC_NAME, NINETY_FIFTH_PERCENTILE_METRIC_NAME, NINETY_NINETH_PERCENTILE_METRIC_NAME, NUM_OPS_METRIC_NAME, SEVENTY_FIFTH_PERCENTILE_METRIC_NAME

Constructor Summary

Constructors
Constructor and Description
`MetricMutableQuantiles(String name, String description, String sampleName, String valueName, int interval)` Instantiates a new `MetricMutableQuantiles` for a metric that rolls itself over on the specified time interval.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`add(long value)` Add a single value to a histogram's stream of values.
`int`	`getInterval()`
`void`	`snapshot(org.apache.hadoop.metrics2.MetricsRecordBuilder builder, boolean all)`

Methods inherited from class org.apache.hadoop.metrics2.lib.MutableMetric
changed, clearChanged, setChanged, snapshot

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

Field Detail

quantiles

static final MetricQuantile[] quantiles

numInfo

private final org.apache.hadoop.metrics2.MetricsInfo numInfo

quantileInfos

private final org.apache.hadoop.metrics2.MetricsInfo[] quantileInfos

interval
```
private final int interval
```

estimator

private MetricSampleQuantiles estimator

previousCount
```
private long previousCount
```

executor
```
private MetricsExecutor executor
```

previousSnapshot

protected Map<MetricQuantile,Long> previousSnapshot

Constructor Detail
- MetricMutableQuantiles
```
public MetricMutableQuantiles(String name,
                      String description,
                      String sampleName,
                      String valueName,
                      int interval)
```
  Instantiates a new MetricMutableQuantiles for a metric that rolls itself over on the specified time interval.
  
  Parameters:
  name - of the metric
  description - long-form textual description of the metric
  sampleName - type of items in the stream (e.g., "Ops")
  valueName - type of the values
  interval - rollover interval (in seconds) of the estimator

Method Detail
- snapshot
```
public void snapshot(org.apache.hadoop.metrics2.MetricsRecordBuilder builder,
            boolean all)
```
  Specified by:
  
  snapshot in class org.apache.hadoop.metrics2.lib.MutableMetric
- add
```
public void add(long value)
```
  Description copied from interface: MetricHistogram
  
  Add a single value to a histogram's stream of values.
  
  Specified by:
  
  add in interface MetricHistogram
- getInterval
```
public int getInterval()
```

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