DatanodeID (Hadoop 1.2.2-SNAPSHOT API)

java.lang.Object
- org.apache.hadoop.hdfs.protocol.DatanodeID

所有已实现的接口:

Comparable<DatanodeID>, Writable, WritableComparable<DatanodeID>

直接已知子类:

DatanodeInfo, DatanodeRegistration
```
public class DatanodeID
extends Object
implements WritableComparable<DatanodeID>
```
DatanodeID is composed of the data node name (hostname:portNumber) and the data storage ID, which it currently represents.

字段概要

字段
限定符和类型字段和说明

static DatanodeID[] EMPTY_ARRAY

protected int infoPort

int ipcPort

String name

String storageID

字段
限定符和类型	字段和说明
`static DatanodeID[]`	`EMPTY_ARRAY`
`protected int`	`infoPort`
`int`	`ipcPort`
`String`	`name`
`String`	`storageID`

构造器概要

构造器
构造器和说明
`DatanodeID()` Equivalent to DatanodeID("").
`DatanodeID(DatanodeID from)` DatanodeID copy constructor
`DatanodeID(String nodeName)` Equivalent to DatanodeID(nodeName, "", -1, -1).
`DatanodeID(String nodeName, String storageID, int infoPort, int ipcPort)` Create DatanodeID

方法概要

方法
限定符和类型	方法和说明
`int`	`compareTo(DatanodeID that)` Comparable.
`boolean`	`equals(Object to)`
`String`	`getHost()`
`int`	`getInfoPort()`
`int`	`getIpcPort()`
`String`	`getName()`
`int`	`getPort()`
`String`	`getStorageID()`
`int`	`hashCode()`
`void`	`readFields(DataInput in)` Deserialize the fields of this object from `in`.
`void`	`setStorageID(String storageID)` sets the data storage ID.
`String`	`toString()`
`void`	`updateRegInfo(DatanodeID nodeReg)` Update fields when a new registration request comes in.
`void`	`write(DataOutput out)` Serialize the fields of this object to `out`.

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

- 字段详细资料
  - EMPTY_ARRAY
```
public static final DatanodeID[] EMPTY_ARRAY
```
  - name
```
public String name
```
  - storageID
```
public String storageID
```
  - infoPort
```
protected int infoPort
```
  - ipcPort
```
public int ipcPort
```
- 构造器详细资料
  - DatanodeID
```
public DatanodeID()
```
    Equivalent to DatanodeID("").
  - DatanodeID
```
public DatanodeID(String nodeName)
```
    Equivalent to DatanodeID(nodeName, "", -1, -1).
  - DatanodeID
```
public DatanodeID(DatanodeID from)
```
    DatanodeID copy constructor
    
    参数:
    from -
  - DatanodeID
```
public DatanodeID(String nodeName,
          String storageID,
          int infoPort,
          int ipcPort)
```
    Create DatanodeID
    
    参数:
    nodeName - (hostname:portNumber)
    storageID - data storage ID
    infoPort - info server port
    ipcPort - ipc server port
- 方法详细资料
  - getName
```
public String getName()
```
    返回:
    hostname:portNumber.
  - getStorageID
```
public String getStorageID()
```
    返回:
    data storage ID.
  - getInfoPort
```
public int getInfoPort()
```
    返回:
    infoPort (the port at which the HTTP server bound to)
  - getIpcPort
```
public int getIpcPort()
```
    返回:
    ipcPort (the port at which the IPC server bound to)
  - setStorageID
```
public void setStorageID(String storageID)
```
    sets the data storage ID.
  - getHost
```
public String getHost()
```
    返回:
    hostname and no :portNumber.
  - getPort
```
public int getPort()
```
  - equals
```
public boolean equals(Object to)
```
    覆盖:
    
    equals 在类中 Object
  - hashCode
```
public int hashCode()
```
    覆盖:
    
    hashCode 在类中 Object
  - toString
```
public String toString()
```
    覆盖:
    
    toString 在类中 Object
  - updateRegInfo
```
public void updateRegInfo(DatanodeID nodeReg)
```
    Update fields when a new registration request comes in. Note that this does not update storageID.
  - compareTo
```
public int compareTo(DatanodeID that)
```
    Comparable. Basis of compare is the String name (host:portNumber) only.
    
    指定者:
    
    compareTo 在接口中 Comparable<DatanodeID>
    
    参数:
    that -
    
    返回:
    as specified by Comparable.
  - write
```
public void write(DataOutput out)
           throws IOException
```
    Serialize the fields of this object to out.
    
    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
```
    Deserialize the fields of this object from in.
    For efficiency, implementations should attempt to re-use storage in the existing object where possible.
    
    指定者:
    
    readFields 在接口中 Writable
    
    参数:
    in - DataInput to deseriablize this object from.
    
    抛出:
    
    IOException

类 DatanodeID

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

EMPTY_ARRAY

name

storageID

infoPort

ipcPort

构造器详细资料

DatanodeID

DatanodeID

DatanodeID

DatanodeID

方法详细资料

getName

getStorageID

getInfoPort

getIpcPort

setStorageID

getHost

getPort

equals

hashCode

toString

updateRegInfo

compareTo

write

readFields