Package org.apache.hadoop.mapred

Class Counters.Group

java.lang.Object

org.apache.hadoop.mapred.Counters.Group

All Implemented Interfaces:

Iterable<Counters.Counter>, Writable, CounterGroupBase<Counters.Counter>

Enclosing class:

Counters

@Public
@Stable
public static class Counters.Group
extends Object
implements CounterGroupBase<Counters.Counter>

Group of counters, comprising of counters from a particular counter Enum class.

Grouphandles localization of the class name and the counter names.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Group()

Method Summary

Modifier and Type	Method	Description
Counters.Counter	addCounter(String name, String displayName, long value)	Add a counter to this group
void	addCounter(Counters.Counter counter)	Add a counter to this group.
boolean	equals(Object genericRight)
Counters.Counter	findCounter(String counterName)	Find a counter in the group.
Counters.Counter	findCounter(String counterName, boolean create)	Find a counter in the group
Counters.Counter	findCounter(String counterName, String displayName)	Find a counter in the group.
Counters.Counter	getCounter(int id, String name)	Deprecated. use findCounter(String) instead
long	getCounter(String counterName)
Counters.Counter	getCounterForName(String name)	Get the counter for the given name and create it if it doesn't exist.
String	getDisplayName()	Get the display name of the group.
String	getName()	Get the internal name of the group
CounterGroupBase<Counters.Counter>	getUnderlyingGroup()
int	hashCode()
void	incrAllCounters(CounterGroupBase<Counters.Counter> rightGroup)	Increment all counters by a group of counters
Iterator<Counters.Counter>	iterator()
String	makeEscapedCompactString()
void	readFields(DataInput in)	Deserialize the fields of this object from in.
void	setDisplayName(String displayName)	Set the display name of the group
int	size()
void	write(DataOutput out)	Serialize the fields of this object to out.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Details

Group

protected Group()

Method Details

getCounter

public long getCounter(String counterName)

Parameters:

counterName - the name of the counter

Returns:

the value of the specified counter, or 0 if the counter does not exist.

makeEscapedCompactString

public String makeEscapedCompactString()

Returns:

the compact stringified version of the group in the format {(actual-name)(display-name)(value)[][][]} where [] are compact strings for the counters within.

getCounter

@Deprecated
public Counters.Counter getCounter(int id,
 String name)

Deprecated.

use findCounter(String) instead

Get the counter for the given id and create it if it doesn't exist.

Parameters:

id - the numeric id of the counter within the group

name - the internal counter name

Returns:

the counter

getCounterForName

public Counters.Counter getCounterForName(String name)

Get the counter for the given name and create it if it doesn't exist.

Parameters:

name - the internal counter name

Returns:

the counter

write

public void write(DataOutput out)
           throws IOException

Description copied from interface: Writable

Serialize the fields of this object to out.

Specified by:

write in interface Writable

Parameters:

out - DataOuput to serialize this object into.

Throws:

IOException - any other problem for write.

readFields

public void readFields(DataInput in)
                throws IOException

Description copied from interface: Writable

Deserialize the fields of this object from in.

For efficiency, implementations should attempt to re-use storage in the existing object where possible.

Specified by:

readFields in interface Writable

Parameters:

in - DataInput to deseriablize this object from.

Throws:

IOException - any other problem for readFields.

iterator

public Iterator<Counters.Counter> iterator()

Specified by:

iterator in interface Iterable<Counters.Counter>

getName

public String getName()

Description copied from interface: CounterGroupBase

Get the internal name of the group

Specified by:

getName in interface CounterGroupBase<Counters.Counter>

Returns:

the internal name

getDisplayName

public String getDisplayName()

Description copied from interface: CounterGroupBase

Get the display name of the group.

Specified by:

getDisplayName in interface CounterGroupBase<Counters.Counter>

Returns:

the human readable name

setDisplayName

public void setDisplayName(String displayName)

Description copied from interface: CounterGroupBase

Set the display name of the group

Specified by:

setDisplayName in interface CounterGroupBase<Counters.Counter>

Parameters:

displayName - of the group

addCounter

public void addCounter(Counters.Counter counter)

Description copied from interface: CounterGroupBase

Add a counter to this group.

Specified by:

addCounter in interface CounterGroupBase<Counters.Counter>

Parameters:

counter - to add

addCounter

public Counters.Counter addCounter(String name,
 String displayName,
 long value)

Description copied from interface: CounterGroupBase

Add a counter to this group

Specified by:

addCounter in interface CounterGroupBase<Counters.Counter>

Parameters:

name - of the counter

displayName - of the counter

value - of the counter

Returns:

the counter

findCounter

public Counters.Counter findCounter(String counterName,
 String displayName)

Description copied from interface: CounterGroupBase

Find a counter in the group.

Specified by:

findCounter in interface CounterGroupBase<Counters.Counter>

Parameters:

counterName - the name of the counter

displayName - the display name of the counter

Returns:

the counter that was found or added

findCounter

public Counters.Counter findCounter(String counterName,
 boolean create)

Description copied from interface: CounterGroupBase

Find a counter in the group

Specified by:

findCounter in interface CounterGroupBase<Counters.Counter>

Parameters:

counterName - the name of the counter

create - create the counter if not found if true

Returns:

the counter that was found or added or null if create is false

findCounter

public Counters.Counter findCounter(String counterName)

Description copied from interface: CounterGroupBase

Find a counter in the group.

Specified by:

findCounter in interface CounterGroupBase<Counters.Counter>

Parameters:

counterName - the name of the counter

Returns:

the counter that was found or added

size

public int size()

Specified by:

size in interface CounterGroupBase<Counters.Counter>

Returns:

the number of counters in this group.

incrAllCounters

public void incrAllCounters(CounterGroupBase<Counters.Counter> rightGroup)

Description copied from interface: CounterGroupBase

Increment all counters by a group of counters

Specified by:

incrAllCounters in interface CounterGroupBase<Counters.Counter>

Parameters:

rightGroup - the group to be added to this group

getUnderlyingGroup

public CounterGroupBase<Counters.Counter> getUnderlyingGroup()

Specified by:

getUnderlyingGroup in interface CounterGroupBase<Counters.Counter>

equals

public boolean equals(Object genericRight)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object