org.apache.hadoop.hdfs.server.common

Class GenerationStamp

java.lang.Object

org.apache.hadoop.util.SequentialNumber

org.apache.hadoop.hdfs.server.common.GenerationStamp

@InterfaceAudience.Private
public class GenerationStamp
extends SequentialNumber

A GenerationStamp is a Hadoop FS primitive, identified by a long.

Field Summary

Fields

Modifier and Type	Field and Description
static long	GRANDFATHER_GENERATION_STAMP Generation stamp of blocks that pre-date the introduction of a generation stamp.
static long	LAST_RESERVED_STAMP The last reserved generation stamp.

Constructor Summary

Constructors

Constructor and Description
GenerationStamp() Create a new instance, initialized to LAST_RESERVED_STAMP.

Method Summary

Methods inherited from class org.apache.hadoop.util.SequentialNumber

equals, getCurrentValue, hashCode, nextValue, setCurrentValue, skipTo

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Field Detail

LAST_RESERVED_STAMP

public static final long LAST_RESERVED_STAMP

The last reserved generation stamp.

See Also:

Constant Field Values

GRANDFATHER_GENERATION_STAMP

public static final long GRANDFATHER_GENERATION_STAMP

Generation stamp of blocks that pre-date the introduction of a generation stamp.

See Also:

Constant Field Values

Constructor Detail

GenerationStamp

public GenerationStamp()

Create a new instance, initialized to LAST_RESERVED_STAMP.