org.apache.hadoop.hdfs.server.common

Enum HdfsServerConstants.BlockUCState

java.lang.Object

java.lang.Enum<HdfsServerConstants.BlockUCState>

org.apache.hadoop.hdfs.server.common.HdfsServerConstants.BlockUCState

All Implemented Interfaces:

Serializable, Comparable<HdfsServerConstants.BlockUCState>

Enclosing class:

org.apache.hadoop.hdfs.server.common.HdfsServerConstants

public static enum HdfsServerConstants.BlockUCState
extends Enum<HdfsServerConstants.BlockUCState>

States, which a block can go through while it is under construction.

Enum Constant Summary

Enum Constants

Enum Constant and Description
COMMITTED The block is committed. The client reported that all bytes are written to data-nodes with the given generation stamp and block length, but no HdfsServerConstants.ReplicaState.FINALIZED replicas has yet been reported by data-nodes themselves.
COMPLETE Block construction completed. The block has at least the configured minimal replication number of HdfsServerConstants.ReplicaState.FINALIZED replica(s), and is not going to be modified.
UNDER_CONSTRUCTION The block is under construction. It has been recently allocated for write or append.
UNDER_RECOVERY The block is under recovery. When a file lease expires its last block may not be COMPLETE and needs to go through a recovery procedure, which synchronizes the existing replicas contents.

Method Summary

Modifier and Type	Method and Description
static HdfsServerConstants.BlockUCState	valueOf(String name) Returns the enum constant of this type with the specified name.
static HdfsServerConstants.BlockUCState[]	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

COMPLETE

public static final HdfsServerConstants.BlockUCState COMPLETE

Block construction completed.
The block has at least the configured minimal replication number of HdfsServerConstants.ReplicaState.FINALIZED replica(s), and is not going to be modified. NOTE, in some special cases, a block may be forced to COMPLETE state, even if it doesn't have required minimal replications.

UNDER_CONSTRUCTION

public static final HdfsServerConstants.BlockUCState UNDER_CONSTRUCTION

The block is under construction.
It has been recently allocated for write or append.

UNDER_RECOVERY

public static final HdfsServerConstants.BlockUCState UNDER_RECOVERY

The block is under recovery.
When a file lease expires its last block may not be COMPLETE and needs to go through a recovery procedure, which synchronizes the existing replicas contents.

COMMITTED

public static final HdfsServerConstants.BlockUCState COMMITTED

The block is committed.
The client reported that all bytes are written to data-nodes with the given generation stamp and block length, but no HdfsServerConstants.ReplicaState.FINALIZED replicas has yet been reported by data-nodes themselves.

Method Detail

values

public static HdfsServerConstants.BlockUCState[] 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 (HdfsServerConstants.BlockUCState c : HdfsServerConstants.BlockUCState.values())
    System.out.println(c);

Returns:

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

valueOf

public static HdfsServerConstants.BlockUCState 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