Op (Apache Hadoop HDFS Client 3.4.1.100-eep-941 API)

java.lang.Object
- java.lang.Enum<Op>
- - org.apache.hadoop.hdfs.protocol.datatransfer.Op

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<Op>
```
@Private
@Evolving
public enum Op
extends java.lang.Enum<Op>
```
Operation

Enum Constant Summary

Enum Constants
Enum Constant	Description
`BLOCK_CHECKSUM`
`BLOCK_GROUP_CHECKSUM`
`COPY_BLOCK`
`CUSTOM`
`READ_BLOCK`
`READ_METADATA`
`RELEASE_SHORT_CIRCUIT_FDS`
`REPLACE_BLOCK`
`REQUEST_SHORT_CIRCUIT_FDS`
`REQUEST_SHORT_CIRCUIT_SHM`
`TRANSFER_BLOCK`
`WRITE_BLOCK`

Field Summary

Fields
Modifier and Type Field Description

byte code
The code for this operation.

Fields
Modifier and Type	Field	Description
`byte`	`code`	The code for this operation.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static Op`	`read(java.io.DataInput in)`	Read from in
`static Op`	`valueOf(java.lang.String name)`	Returns the enum constant of this type with the specified name.
`static Op[]`	`values()`	Returns an array containing the constants of this enum type, in the order they are declared.
`void`	`write(java.io.DataOutput out)`	Write to out

Methods inherited from class java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- Enum Constant Detail
  - WRITE_BLOCK
```
public static final Op WRITE_BLOCK
```
  - READ_BLOCK
```
public static final Op READ_BLOCK
```
  - READ_METADATA
```
public static final Op READ_METADATA
```
  - REPLACE_BLOCK
```
public static final Op REPLACE_BLOCK
```
  - COPY_BLOCK
```
public static final Op COPY_BLOCK
```
  - BLOCK_CHECKSUM
```
public static final Op BLOCK_CHECKSUM
```
  - TRANSFER_BLOCK
```
public static final Op TRANSFER_BLOCK
```
  - REQUEST_SHORT_CIRCUIT_FDS
```
public static final Op REQUEST_SHORT_CIRCUIT_FDS
```
  - RELEASE_SHORT_CIRCUIT_FDS
```
public static final Op RELEASE_SHORT_CIRCUIT_FDS
```
  - REQUEST_SHORT_CIRCUIT_SHM
```
public static final Op REQUEST_SHORT_CIRCUIT_SHM
```
  - BLOCK_GROUP_CHECKSUM
```
public static final Op BLOCK_GROUP_CHECKSUM
```
  - CUSTOM
```
public static final Op CUSTOM
```
- Field Detail
  - code
```
public final byte code
```
    The code for this operation.
- Method Detail
  - values
```
public static Op[] values()
```
    Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
```
for (Op c : Op.values())
    System.out.println(c);
```
    Returns:
    
    an array containing the constants of this enum type, in the order they are declared
  - valueOf
```
public static Op valueOf(java.lang.String name)
```
    Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
    
    Parameters:
    
    name - the name of the enum constant to be returned.
    
    Returns:
    
    the enum constant with the specified name
    
    Throws:
    
    java.lang.IllegalArgumentException - if this enum type has no constant with the specified name
    
    java.lang.NullPointerException - if the argument is null
  - read
```
public static Op read(java.io.DataInput in)
               throws java.io.IOException
```
    Read from in
    
    Throws:
    
    java.io.IOException
  - write
```
public void write(java.io.DataOutput out)
           throws java.io.IOException
```
    Write to out
    
    Throws:
    
    java.io.IOException

Enum Op

Enum Constant Summary

Field Summary

Method Summary

Methods inherited from class java.lang.Enum

Methods inherited from class java.lang.Object

Enum Constant Detail

WRITE_BLOCK

READ_BLOCK

READ_METADATA

REPLACE_BLOCK

COPY_BLOCK

BLOCK_CHECKSUM

TRANSFER_BLOCK

REQUEST_SHORT_CIRCUIT_FDS

RELEASE_SHORT_CIRCUIT_FDS

REQUEST_SHORT_CIRCUIT_SHM

BLOCK_GROUP_CHECKSUM

CUSTOM

Field Detail

code

Method Detail

values

valueOf

read

write