org.apache.hadoop.metrics2.lib

Class MetricsRegistry

java.lang.Object

org.apache.hadoop.metrics2.lib.MetricsRegistry

@InterfaceAudience.Public
@InterfaceStability.Evolving
public class MetricsRegistry
extends Object

An optional metrics registry class for creating and maintaining a collection of MetricsMutables, making writing metrics source easier.

Constructor Summary

Constructors

Constructor and Description
MetricsRegistry(MetricsInfo info) Construct the registry with a metadata object
MetricsRegistry(String name) Construct the registry with a record name

Method Summary

Methods

Modifier and Type	Method and Description
void	add(String name, long value) Add sample to a stat metric by name.
MutableMetric	get(String name) Get a metric by name
MetricsTag	getTag(String name) Get a tag by name
MetricsInfo	info()
MutableCounterInt	newCounter(MetricsInfo info, int iVal) Create a mutable integer counter
MutableCounterLong	newCounter(MetricsInfo info, long iVal) Create a mutable long integer counter
MutableCounterInt	newCounter(String name, String desc, int iVal) Create a mutable integer counter
MutableCounterLong	newCounter(String name, String desc, long iVal) Create a mutable long integer counter
MutableGaugeInt	newGauge(MetricsInfo info, int iVal) Create a mutable integer gauge
MutableGaugeLong	newGauge(MetricsInfo info, long iVal) Create a mutable long integer gauge
MutableGaugeInt	newGauge(String name, String desc, int iVal) Create a mutable integer gauge
MutableGaugeLong	newGauge(String name, String desc, long iVal) Create a mutable long integer gauge
MutableQuantiles	newQuantiles(String name, String desc, String sampleName, String valueName, int interval) Create a mutable metric that estimates quantiles of a stream of values
MutableRate	newRate(String name) Create a mutable rate metric
MutableRate	newRate(String name, String description) Create a mutable rate metric
MutableRate	newRate(String name, String desc, boolean extended) Create a mutable rate metric (for throughput measurement)
MutableRatesWithAggregation	newRatesWithAggregation(String name)
MutableStat	newStat(String name, String desc, String sampleName, String valueName) Create a mutable metric with stats
MutableStat	newStat(String name, String desc, String sampleName, String valueName, boolean extended) Create a mutable metric with stats
MetricsRegistry	setContext(String name) Set the metrics context tag
void	snapshot(MetricsRecordBuilder builder, boolean all) Sample all the mutable metrics and put the snapshot in the builder
MetricsRegistry	tag(MetricsInfo info, String value)
MetricsRegistry	tag(MetricsInfo info, String value, boolean override) Add a tag to the metrics
MetricsRegistry	tag(String name, String description, String value) Add a tag to the metrics
MetricsRegistry	tag(String name, String description, String value, boolean override) Add a tag to the metrics
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

MetricsRegistry

public MetricsRegistry(String name)

Construct the registry with a record name

Parameters:

name - of the record of the metrics

MetricsRegistry

public MetricsRegistry(MetricsInfo info)

Construct the registry with a metadata object

Parameters:

info - the info object for the metrics record/group

Method Detail

info

public MetricsInfo info()

Returns:

the info object of the metrics registry

get

public MutableMetric get(String name)

Get a metric by name

Parameters:

name - of the metric

Returns:

the metric object

getTag

public MetricsTag getTag(String name)

Get a tag by name

Parameters:

name - of the tag

Returns:

the tag object

newCounter

public MutableCounterInt newCounter(String name,
                           String desc,
                           int iVal)

Create a mutable integer counter

Parameters:

name - of the metric

desc - metric description

iVal - initial value

Returns:

a new counter object

newCounter

public MutableCounterInt newCounter(MetricsInfo info,
                           int iVal)

Create a mutable integer counter

Parameters:

info - metadata of the metric

iVal - initial value

Returns:

a new counter object

newCounter

public MutableCounterLong newCounter(String name,
                            String desc,
                            long iVal)

Create a mutable long integer counter

Parameters:

name - of the metric

desc - metric description

iVal - initial value

Returns:

a new counter object

newCounter

public MutableCounterLong newCounter(MetricsInfo info,
                            long iVal)

Create a mutable long integer counter

Parameters:

info - metadata of the metric

iVal - initial value

Returns:

a new counter object

newGauge

public MutableGaugeInt newGauge(String name,
                       String desc,
                       int iVal)

Create a mutable integer gauge

Parameters:

name - of the metric

desc - metric description

iVal - initial value

Returns:

a new gauge object

newGauge

public MutableGaugeInt newGauge(MetricsInfo info,
                       int iVal)

Create a mutable integer gauge

Parameters:

info - metadata of the metric

iVal - initial value

Returns:

a new gauge object

newGauge

public MutableGaugeLong newGauge(String name,
                        String desc,
                        long iVal)

Create a mutable long integer gauge

Parameters:

name - of the metric

desc - metric description

iVal - initial value

Returns:

a new gauge object

newGauge

public MutableGaugeLong newGauge(MetricsInfo info,
                        long iVal)

Create a mutable long integer gauge

Parameters:

info - metadata of the metric

iVal - initial value

Returns:

a new gauge object

newQuantiles

public MutableQuantiles newQuantiles(String name,
                            String desc,
                            String sampleName,
                            String valueName,
                            int interval)

Create a mutable metric that estimates quantiles of a stream of values

Parameters:

name - of the metric

desc - metric description

sampleName - of the metric (e.g., "Ops")

valueName - of the metric (e.g., "Time" or "Latency")

interval - rollover interval of estimator in seconds

Returns:

a new quantile estimator object

Throws:

MetricsException - if interval is not a positive integer

newStat

public MutableStat newStat(String name,
                  String desc,
                  String sampleName,
                  String valueName,
                  boolean extended)

Create a mutable metric with stats

Parameters:

name - of the metric

desc - metric description

sampleName - of the metric (e.g., "Ops")

valueName - of the metric (e.g., "Time" or "Latency")

extended - produce extended stat (stdev, min/max etc.) if true.

Returns:

a new mutable stat metric object

newStat

public MutableStat newStat(String name,
                  String desc,
                  String sampleName,
                  String valueName)

Create a mutable metric with stats

Parameters:

name - of the metric

desc - metric description

sampleName - of the metric (e.g., "Ops")

valueName - of the metric (e.g., "Time" or "Latency")

Returns:

a new mutable metric object

newRate

public MutableRate newRate(String name)

Create a mutable rate metric

Parameters:

name - of the metric

Returns:

a new mutable metric object

newRate

public MutableRate newRate(String name,
                  String description)

Create a mutable rate metric

Parameters:

name - of the metric

description - of the metric

Returns:

a new mutable rate metric object

newRate

public MutableRate newRate(String name,
                  String desc,
                  boolean extended)

Create a mutable rate metric (for throughput measurement)

Parameters:

name - of the metric

desc - description

extended - produce extended stat (stdev/min/max etc.) if true

Returns:

a new mutable rate metric object

newRatesWithAggregation

public MutableRatesWithAggregation newRatesWithAggregation(String name)

add

public void add(String name,
       long value)

Add sample to a stat metric by name.

Parameters:

name - of the metric

value - of the snapshot to add

setContext

public MetricsRegistry setContext(String name)

Set the metrics context tag

Parameters:

name - of the context

Returns:

the registry itself as a convenience

tag

public MetricsRegistry tag(String name,
                  String description,
                  String value)

Add a tag to the metrics

Parameters:

name - of the tag

description - of the tag

value - of the tag

Returns:

the registry (for keep adding tags)

tag

public MetricsRegistry tag(String name,
                  String description,
                  String value,
                  boolean override)

Add a tag to the metrics

Parameters:

name - of the tag

description - of the tag

value - of the tag

override - existing tag if true

Returns:

the registry (for keep adding tags)

tag

public MetricsRegistry tag(MetricsInfo info,
                  String value,
                  boolean override)

Add a tag to the metrics

Parameters:

info - metadata of the tag

value - of the tag

override - existing tag if true

Returns:

the registry (for keep adding tags etc.)

tag

public MetricsRegistry tag(MetricsInfo info,
                  String value)

snapshot

public void snapshot(MetricsRecordBuilder builder,
            boolean all)

Sample all the mutable metrics and put the snapshot in the builder

Parameters:

builder - to contain the metrics snapshot

all - get all the metrics even if the values are not changed.

toString

public String toString()

Overrides:

toString in class Object