Package org.apache.hadoop.mapreduce

Class Counters

java.lang.Object

org.apache.hadoop.mapreduce.counters.AbstractCounters<Counter,CounterGroup>

org.apache.hadoop.mapreduce.Counters

All Implemented Interfaces:

Iterable<CounterGroup>, Writable

@Public
@Stable
public class Counters
extends AbstractCounters<Counter,CounterGroup>

Counters holds per job/task counters, defined either by the Map-Reduce framework or applications. Each Counter can be of any Enum type.

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

Field Summary

Fields inherited from class org.apache.hadoop.mapreduce.counters.AbstractCounters

LOG

Constructor Summary

Constructors

Constructor	Description
Counters()	Default constructor
Counters(AbstractCounters<C,G> counters)	Construct the Counters object from the another counters object

Method Summary

Methods inherited from class org.apache.hadoop.mapreduce.counters.AbstractCounters

addGroup, addGroup, countCounters, equals, findCounter, findCounter, findCounter, getGroup, getGroupNames, getWriteAllCounters, hashCode, incrAllCounters, iterator, limits, readFields, setWriteAllCounters, toString, write

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Details

Counters

public Counters()

Default constructor

Counters

public Counters(AbstractCounters<C,G> counters)

Construct the Counters object from the another counters object

Type Parameters:

C - the type of counter

G - the type of counter group

Parameters:

counters - the old counters object