alluxio.master.journal.ufs

Class UfsJournalSnapshot

java.lang.Object

alluxio.master.journal.ufs.UfsJournalSnapshot

@ThreadSafe
public final class UfsJournalSnapshot
extends Object

This class provides a snapshot of everything in the journal and some utility methods.

Method Summary

Modifier and Type	Method and Description
List<UfsJournalFile>	getCheckpoints()
static UfsJournalFile	getCurrentLog(UfsJournal journal) Gets the current log (the incomplete log) that is being written to.
UfsJournalFile	getLatestCheckpoint()
List<UfsJournalFile>	getLogs()
static UfsJournalSnapshot	getSnapshot(UfsJournal journal) Creates a snapshot of the journal.
List<UfsJournalFile>	getTemporaryCheckpoints()

Methods inherited from class java.lang.Object

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

Method Detail

getCheckpoints

public List<UfsJournalFile> getCheckpoints()

Returns:

the checkpoints sorted by end sequence number increasingly

getLatestCheckpoint

public UfsJournalFile getLatestCheckpoint()

Returns:

the latest checkpoint, null if no checkpoint exists

getLogs

public List<UfsJournalFile> getLogs()

Returns:

the logs sorted by the end sequence number increasingly

getTemporaryCheckpoints

public List<UfsJournalFile> getTemporaryCheckpoints()

Returns:

the temporary checkpoints

getSnapshot

public static UfsJournalSnapshot getSnapshot(UfsJournal journal)
                                      throws IOException

Creates a snapshot of the journal.

Parameters:

journal - the journal

Returns:

the journal snapshot

Throws:

IOException

getCurrentLog

public static UfsJournalFile getCurrentLog(UfsJournal journal)
                                    throws IOException

Gets the current log (the incomplete log) that is being written to.

Parameters:

journal - the journal

Returns:

the current log

Throws:

IOException