org.apache.hadoop.hdfs.server.namenode
Enum NameNode.OperationCategory

java.lang.Object
  java.lang.Enum<NameNode.OperationCategory>
      org.apache.hadoop.hdfs.server.namenode.NameNode.OperationCategory

All Implemented Interfaces:

Serializable, Comparable<NameNode.OperationCategory>

Enclosing class:

org.apache.hadoop.hdfs.server.namenode.NameNode

public static enum NameNode.OperationCategory
extends Enum<NameNode.OperationCategory>

Categories of operations supported by the namenode.

Enum Constant Summary

CHECKPOINT
Operations related to checkpointing

JOURNAL
Operations related to JournalProtocol

READ
Read operation that does not change the namespace state

UNCHECKED
Operations that are state agnostic

WRITE
Write operation that changes the namespace state

Method Summary

static NameNode.OperationCategory	valueOf(String name) Returns the enum constant of this type with the specified name.
static NameNode.OperationCategory[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

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

UNCHECKED

public static final NameNode.OperationCategory UNCHECKED

Operations that are state agnostic

READ

public static final NameNode.OperationCategory READ

Read operation that does not change the namespace state

WRITE

public static final NameNode.OperationCategory WRITE

Write operation that changes the namespace state

CHECKPOINT

public static final NameNode.OperationCategory CHECKPOINT

Operations related to checkpointing

JOURNAL

public static final NameNode.OperationCategory JOURNAL

Operations related to JournalProtocol

Method Detail

values

public static NameNode.OperationCategory[] 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 (NameNode.OperationCategory c : NameNode.OperationCategory.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static NameNode.OperationCategory valueOf(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:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null