alluxio.master.journal.ufs

Class UfsJournalFile

java.lang.Object

alluxio.master.journal.ufs.UfsJournalFile

All Implemented Interfaces:

Comparable<UfsJournalFile>

@ThreadSafe
public final class UfsJournalFile
extends Object
implements Comparable<UfsJournalFile>

A simple data structure that represents a journal file. There are four types of files (SN is short for sequence number): 1. Temporary file: the file name is a random UUID. 2. Completed log file: [start SN]-[end SN] (the start SN is inclusive, the end SN is exclusive). 3. Incomplete log file (a.k.a the current log): [start SN]-[LONG.MAX_VALUE] (the start SN is inclusive). 4. Checkpoint file: [0]-[end SN] (the end SN is exclusive). This data structure implements Comparable such that journal files can be sorted by the end SNs. Note that the natural ordering of the class may not necessarily imply equality of objects. The compareTo(UfsJournalFile) implementation should not be used to determine equality.

Method Summary

Modifier and Type	Method and Description
int	compareTo(UfsJournalFile other)
boolean	equals(Object o)
URI	getLocation()
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

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

Method Detail

getLocation

public URI getLocation()

Returns:

the file location

toString

public String toString()

Overrides:

toString in class Object

compareTo

public int compareTo(UfsJournalFile other)

Specified by:

compareTo in interface Comparable<UfsJournalFile>

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object