org.apache.hadoop.mapreduce

类 Counter

java.lang.Object

org.apache.hadoop.mapreduce.Counter

所有已实现的接口:

Writable

直接已知子类:

Counters.Counter

public class Counter
extends Object
implements Writable

A named counter that tracks the progress of a map/reduce job.

Counters represent global counters, defined either by the Map-Reduce framework or applications. Each Counter is named by an Enum and has a long for the value.

Counters are bunched into Groups, each comprising of counters from a particular Enum class.

构造器概要

构造器

限定符	构造器和说明
protected	Counter()
protected	Counter(String name, String displayName)

方法概要

方法

限定符和类型	方法和说明
boolean	equals(Object genericRight)
String	getDisplayName() Get the name of the counter.
String	getName()
long	getValue() What is the current value of this counter?
int	hashCode()
void	increment(long incr) Increment this counter by the given value
void	readFields(DataInput in) Read the binary representation of the counter
protected void	setDisplayName(String displayName) 已过时。
void	setValue(long value) Set this counter by the given value
void	write(DataOutput out) Write the binary representation of the counter

从类继承的方法 java.lang.Object

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

构造器详细资料

Counter

protected Counter()

Counter

protected Counter(String name,
       String displayName)

方法详细资料

setDisplayName

@Deprecated
protected void setDisplayName(String displayName)

已过时。

readFields

public void readFields(DataInput in)
                throws IOException

Read the binary representation of the counter

指定者:

readFields 在接口中 Writable

参数:

in - DataInput to deseriablize this object from.

抛出:

IOException

write

public void write(DataOutput out)
           throws IOException

Write the binary representation of the counter

指定者:

write 在接口中 Writable

参数:

out - DataOuput to serialize this object into.

抛出:

IOException

getName

public String getName()

getDisplayName

public String getDisplayName()

Get the name of the counter.

返回:

the user facing name of the counter

getValue

public long getValue()

What is the current value of this counter?

返回:

the current value

setValue

public void setValue(long value)

Set this counter by the given value

参数:

value - the value to set

increment

public void increment(long incr)

Increment this counter by the given value

参数:

incr - the value to increase this counter by

equals

public boolean equals(Object genericRight)

覆盖:

equals 在类中 Object

hashCode

public int hashCode()

覆盖:

hashCode 在类中 Object