DataTransferProtocol (Hadoop 1.2.2-SNAPSHOT API)

```
public interface DataTransferProtocol
```
The Client transfers data to/from datanode using a streaming protocol.

嵌套类概要

嵌套类
限定符和类型接口和说明

static class DataTransferProtocol.PipelineAck
reply

嵌套类
限定符和类型	接口和说明
`static class`	`DataTransferProtocol.PipelineAck` reply

字段概要

字段
限定符和类型	字段和说明
`static int`	`DATA_TRANSFER_VERSION` Version for data transfers between clients and datanodes This should change when serialization of DatanodeInfo, not just when protocol changes.
`static byte`	`OP_BLOCK_CHECKSUM`
`static byte`	`OP_COPY_BLOCK`
`static byte`	`OP_READ_BLOCK`
`static byte`	`OP_READ_METADATA` 已过时。 As of version 15, OP_READ_METADATA is no longer supported
`static byte`	`OP_REPLACE_BLOCK`
`static int`	`OP_STATUS_CHECKSUM_OK`
`static int`	`OP_STATUS_ERROR`
`static int`	`OP_STATUS_ERROR_ACCESS_TOKEN`
`static int`	`OP_STATUS_ERROR_CHECKSUM`
`static int`	`OP_STATUS_ERROR_EXISTS`
`static int`	`OP_STATUS_ERROR_INVALID`
`static int`	`OP_STATUS_SUCCESS`
`static byte`	`OP_WRITE_BLOCK`

- 字段详细资料
  - DATA_TRANSFER_VERSION
```
static final int DATA_TRANSFER_VERSION
```
    Version for data transfers between clients and datanodes This should change when serialization of DatanodeInfo, not just when protocol changes. It is not very obvious.
    
    另请参阅:
    常量字段值
  - OP_WRITE_BLOCK
```
static final byte OP_WRITE_BLOCK
```
    另请参阅:
    常量字段值
  - OP_READ_BLOCK
```
static final byte OP_READ_BLOCK
```
    另请参阅:
    常量字段值
  - OP_READ_METADATA
```
@Deprecated
static final byte OP_READ_METADATA
```
    已过时。 As of version 15, OP_READ_METADATA is no longer supported
    
    另请参阅:
    常量字段值
  - OP_REPLACE_BLOCK
```
static final byte OP_REPLACE_BLOCK
```
    另请参阅:
    常量字段值
  - OP_COPY_BLOCK
```
static final byte OP_COPY_BLOCK
```
    另请参阅:
    常量字段值
  - OP_BLOCK_CHECKSUM
```
static final byte OP_BLOCK_CHECKSUM
```
    另请参阅:
    常量字段值
  - OP_STATUS_SUCCESS
```
static final int OP_STATUS_SUCCESS
```
    另请参阅:
    常量字段值
  - OP_STATUS_ERROR
```
static final int OP_STATUS_ERROR
```
    另请参阅:
    常量字段值
  - OP_STATUS_ERROR_CHECKSUM
```
static final int OP_STATUS_ERROR_CHECKSUM
```
    另请参阅:
    常量字段值
  - OP_STATUS_ERROR_INVALID
```
static final int OP_STATUS_ERROR_INVALID
```
    另请参阅:
    常量字段值
  - OP_STATUS_ERROR_EXISTS
```
static final int OP_STATUS_ERROR_EXISTS
```
    另请参阅:
    常量字段值
  - OP_STATUS_ERROR_ACCESS_TOKEN
```
static final int OP_STATUS_ERROR_ACCESS_TOKEN
```
    另请参阅:
    常量字段值
  - OP_STATUS_CHECKSUM_OK
```
static final int OP_STATUS_CHECKSUM_OK
```
    另请参阅:
    常量字段值

接口 DataTransferProtocol

嵌套类概要

字段概要

字段详细资料

DATA_TRANSFER_VERSION

OP_WRITE_BLOCK

OP_READ_BLOCK

OP_READ_METADATA

OP_REPLACE_BLOCK

OP_COPY_BLOCK

OP_BLOCK_CHECKSUM

OP_STATUS_SUCCESS

OP_STATUS_ERROR

OP_STATUS_ERROR_CHECKSUM

OP_STATUS_ERROR_INVALID

OP_STATUS_ERROR_EXISTS

OP_STATUS_ERROR_ACCESS_TOKEN

OP_STATUS_CHECKSUM_OK