org.apache.hadoop.mapreduce

インタフェース Counter

すべてのスーパーインタフェース:

Writable

既知の実装クラスのリスト:

Counters.Counter

@InterfaceAudience.Public
 @InterfaceStability.Stable
public interface Counter
extends 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.

メソッドのサマリー

修飾子とタイプ	メソッドと説明
String	getDisplayName() Get the display name of the counter.
String	getName()
long	getValue() What is the current value of this counter?
void	increment(long incr) Increment this counter by the given value
void	setDisplayName(String displayName) 非推奨です。 (and no-op by default)
void	setValue(long value) Set this counter by the given value

インタフェースから継承されたメソッド org.apache.hadoop.io.Writable

readFields, write

メソッドの詳細

setDisplayName

@Deprecated
void setDisplayName(String displayName)

非推奨です。 (and no-op by default)

Set the display name of the counter

パラメータ:

displayName - of the counter

getName

String getName()

戻り値:

the name of the counter

getDisplayName

String getDisplayName()

Get the display name of the counter.

戻り値:

the user facing name of the counter

getValue

long getValue()

What is the current value of this counter?

戻り値:

the current value

setValue

void setValue(long value)

Set this counter by the given value

パラメータ:

value - the value to set

increment

void increment(long incr)

Increment this counter by the given value

パラメータ:

incr - the value to increase this counter by