org.apache.hadoop.hdfs.server.common
Enum HdfsConstants.NamenodeRole
java.lang.Object
java.lang.Enum<HdfsConstants.NamenodeRole>
org.apache.hadoop.hdfs.server.common.HdfsConstants.NamenodeRole
- All Implemented Interfaces:
- Serializable, Comparable<HdfsConstants.NamenodeRole>
- Enclosing interface:
- HdfsConstants
public static enum HdfsConstants.NamenodeRole
- extends Enum<HdfsConstants.NamenodeRole>
Defines the NameNode role.
ACTIVE
public static final HdfsConstants.NamenodeRole ACTIVE
BACKUP
public static final HdfsConstants.NamenodeRole BACKUP
CHECKPOINT
public static final HdfsConstants.NamenodeRole CHECKPOINT
STANDBY
public static final HdfsConstants.NamenodeRole STANDBY
values
public static HdfsConstants.NamenodeRole[] 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 (HdfsConstants.NamenodeRole c : HdfsConstants.NamenodeRole.values())
System.out.println(c);
- Returns:
- an array containing the constants of this enum type, in
the order they are declared
valueOf
public static HdfsConstants.NamenodeRole 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
toString
public String toString()
- Overrides:
toString
in class Enum<HdfsConstants.NamenodeRole>
Copyright © 2009 The Apache Software Foundation