Counters (Hadoop 1.2.2-SNAPSHOT API)

java.lang.Object
- org.apache.hadoop.mapreduce.Counters

所有已实现的接口:: Iterable<CounterGroup>, Writable

public class Counters
extends Object
implements Writable, Iterable<CounterGroup>

构造器概要

构造器
构造器和说明

Counters()

Counters(Counters counters)

构造器
构造器和说明
`Counters()`
`Counters(Counters counters)`

方法概要

方法
限定符和类型	方法和说明
`int`	`countCounters()` Returns the total number of counters, by summing the number of counters in each group.
`boolean`	`equals(Object genericRight)`
`Counter`	`findCounter(Enum<?> key)` Find the counter for the given enum.
`Counter`	`findCounter(String groupName, String counterName)`
`CounterGroup`	`getGroup(String groupName)` Returns the named counter group, or an empty group if there is none with the specified name.
`Collection<String>`	`getGroupNames()` Returns the names of all counter classes.
`int`	`hashCode()`
`void`	`incrAllCounters(Counters other)` Increments multiple counters by their amounts in another Counters instance.
`Iterator<CounterGroup>`	`iterator()`
`void`	`readFields(DataInput in)` Read a set of groups.
`String`	`toString()` Return textual representation of the counter values.
`void`	`write(DataOutput out)` Write the set of groups.

从类继承的方法 java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- 构造器详细资料
  - Counters
```
public Counters()
```
  - Counters
```
public Counters(Counters counters)
```
- 方法详细资料
  - findCounter
```
public Counter findCounter(String groupName,
                  String counterName)
```
  - findCounter
```
public Counter findCounter(Enum<?> key)
```
    Find the counter for the given enum. The same enum will always return the same counter.
    
    参数:
    key - the counter key
    
    返回:
    the matching counter object
  - getGroupNames
```
public Collection<String> getGroupNames()
```
    Returns the names of all counter classes.
    
    返回:
    Set of counter names.
  - iterator
```
public Iterator<CounterGroup> iterator()
```
    指定者:
    
    iterator 在接口中 Iterable<CounterGroup>
  - getGroup
```
public CounterGroup getGroup(String groupName)
```
    Returns the named counter group, or an empty group if there is none with the specified name.
  - countCounters
```
public int countCounters()
```
    Returns the total number of counters, by summing the number of counters in each group.
  - write
```
public void write(DataOutput out)
           throws IOException
```
    Write the set of groups. The external format is: #groups (groupName group)* i.e. the number of groups followed by 0 or more groups, where each group is of the form: groupDisplayName #counters (false | true counter)* where each counter is of the form: name (false | true displayName) value
    
    指定者:
    
    write 在接口中 Writable
    
    参数:
    out - DataOuput to serialize this object into.
    
    抛出:
    
    IOException
  - readFields
```
public void readFields(DataInput in)
                throws IOException
```
    Read a set of groups.
    
    指定者:
    
    readFields 在接口中 Writable
    
    参数:
    in - DataInput to deseriablize this object from.
    
    抛出:
    
    IOException
  - toString
```
public String toString()
```
    Return textual representation of the counter values.
    
    覆盖:
    
    toString 在类中 Object
  - incrAllCounters
```
public void incrAllCounters(Counters other)
```
    Increments multiple counters by their amounts in another Counters instance.
    
    参数:
    other - the other Counters instance
  - equals
```
public boolean equals(Object genericRight)
```
    覆盖:
    
    equals 在类中 Object
  - hashCode
```
public int hashCode()
```
    覆盖:
    
    hashCode 在类中 Object

类 Counters

构造器概要

方法概要

从类继承的方法 java.lang.Object

构造器详细资料

Counters

Counters

方法详细资料

findCounter

findCounter

getGroupNames

iterator

getGroup

countCounters

write

readFields

toString

incrAllCounters

equals

hashCode