org.apache.hadoop.mapreduce
Interface Counter

All Superinterfaces:
Writable
All Known Implementing Classes:
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.


Method Summary
 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)
          Deprecated. (and no-op by default)
 void setValue(long value)
          Set this counter by the given value
 
Methods inherited from interface org.apache.hadoop.io.Writable
readFields, write
 

Method Detail

setDisplayName

@Deprecated
void setDisplayName(String displayName)
Deprecated. (and no-op by default)

Set the display name of the counter

Parameters:
displayName - of the counter

getName

String getName()
Returns:
the name of the counter

getDisplayName

String getDisplayName()
Get the display name of the counter.

Returns:
the user facing name of the counter

getValue

long getValue()
What is the current value of this counter?

Returns:
the current value

setValue

void setValue(long value)
Set this counter by the given value

Parameters:
value - the value to set

increment

void increment(long incr)
Increment this counter by the given value

Parameters:
incr - the value to increase this counter by


Copyright © 2012 Apache Software Foundation. All Rights Reserved.