Package org.opendaylight.controller.cluster.raft

Class SnapshotManager

java.lang.Object

org.opendaylight.controller.cluster.raft.SnapshotManager

All Implemented Interfaces:

SnapshotState

public class SnapshotManager
extends Object
implements SnapshotState

Manages the capturing of snapshots for a RaftActor.

Author:

Moiz Raja, Thomas Pantelis

Constructor Summary

Constructors

Constructor	Description
SnapshotManager(RaftActorContext context, Logger logger)	Constructs an instance.

Method Summary

Modifier and Type	Method	Description
void	apply(ApplySnapshot snapshot)	Applies a snapshot on a follower that was installed by the leader.
boolean	capture(RaftEntryMeta lastLogEntry, long replicatedToAllIndex)	Initiates a capture snapshot.
boolean	captureToInstall(RaftEntryMeta lastLogEntry, long replicatedToAllIndex, String targetFollower)	Initiates a capture snapshot for the purposing of installing the snapshot on a follower.
boolean	captureWithForcedTrim(RaftEntryMeta lastLogEntry, long replicatedToAllIndex)	Initiates a capture snapshot, while enforcing trimming of the log up to lastAppliedIndex.
void	commit(long sequenceNumber, long timeStamp)	Commit the snapshot by trimming the log.
@NonNull Snapshot.State	convertSnapshot(ByteSource snapshotBytes)
CaptureSnapshot	getCaptureSnapshot()
long	getLastSequenceNumber()
boolean	isApplying()
boolean	isCapturing()	Returns whether or not a capture is in progress.
CaptureSnapshot	newCaptureSnapshot(RaftEntryMeta lastLogEntry, long replicatedToAllIndex, boolean mandatoryTrim)	Constructs a CaptureSnapshot instance.
void	persist(Snapshot.State state, Optional<OutputStream> installSnapshotStream, long totalMemory)	Persists a snapshot.
void	rollback()	Rolls back the snapshot on failure.
long	trimLog(long desiredTrimIndex)	Trims the in-memory log.

Methods inherited from class java.lang.Object

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

Constructor Details

SnapshotManager

public SnapshotManager(RaftActorContext context,
 Logger logger)

Constructs an instance.

Parameters:

context - the RaftActorContext

logger - the Logger

Method Details

isApplying

public boolean isApplying()

isCapturing

public boolean isCapturing()

Description copied from interface: SnapshotState

Returns whether or not a capture is in progress.

Specified by:

isCapturing in interface SnapshotState

Returns:

true when a snapshot is being captured, false otherwise

captureToInstall

public boolean captureToInstall(RaftEntryMeta lastLogEntry,
 long replicatedToAllIndex,
 String targetFollower)

Description copied from interface: SnapshotState

Initiates a capture snapshot for the purposing of installing the snapshot on a follower.

Specified by:

captureToInstall in interface SnapshotState

Parameters:

lastLogEntry - the last entry in the replicated log

replicatedToAllIndex - the current replicatedToAllIndex

targetFollower - the id of the follower on which to install

Returns:

true if capture was started

capture

public boolean capture(RaftEntryMeta lastLogEntry,
 long replicatedToAllIndex)

Description copied from interface: SnapshotState

Initiates a capture snapshot.

Specified by:

capture in interface SnapshotState

Parameters:

lastLogEntry - the last entry in the replicated log

replicatedToAllIndex - the current replicatedToAllIndex

Returns:

true if capture was started

captureWithForcedTrim

public boolean captureWithForcedTrim(RaftEntryMeta lastLogEntry,
 long replicatedToAllIndex)

Description copied from interface: SnapshotState

Initiates a capture snapshot, while enforcing trimming of the log up to lastAppliedIndex.

Specified by:

captureWithForcedTrim in interface SnapshotState

Parameters:

lastLogEntry - the last entry in the replicated log

replicatedToAllIndex - the current replicatedToAllIndex

Returns:

true if capture was started

apply

public void apply(ApplySnapshot snapshot)

Description copied from interface: SnapshotState

Applies a snapshot on a follower that was installed by the leader.

Specified by:

apply in interface SnapshotState

Parameters:

snapshot - the Snapshot to apply.

persist

public void persist(Snapshot.State state,
 Optional<OutputStream> installSnapshotStream,
 long totalMemory)

Description copied from interface: SnapshotState

Persists a snapshot.

Specified by:

persist in interface SnapshotState

Parameters:

state - the snapshot State

installSnapshotStream - Optional OutputStream that is present if the snapshot is to also be installed on a follower.

totalMemory - the total memory threshold

commit

public void commit(long sequenceNumber,
 long timeStamp)

Description copied from interface: SnapshotState

Commit the snapshot by trimming the log.

Specified by:

commit in interface SnapshotState

Parameters:

sequenceNumber - the sequence number of the persisted snapshot

timeStamp - the time stamp of the persisted snapshot

rollback

public void rollback()

Description copied from interface: SnapshotState

Rolls back the snapshot on failure.

Specified by:

rollback in interface SnapshotState

trimLog

public long trimLog(long desiredTrimIndex)

Description copied from interface: SnapshotState

Trims the in-memory log.

Specified by:

trimLog in interface SnapshotState

Parameters:

desiredTrimIndex - the desired index to trim from

Returns:

the actual trim index

convertSnapshot

public @NonNull Snapshot.State convertSnapshot(ByteSource snapshotBytes)
                                        throws IOException

Throws:

IOException

getLastSequenceNumber

public long getLastSequenceNumber()

getCaptureSnapshot

public CaptureSnapshot getCaptureSnapshot()

newCaptureSnapshot

public CaptureSnapshot newCaptureSnapshot(RaftEntryMeta lastLogEntry,
 long replicatedToAllIndex,
 boolean mandatoryTrim)

Constructs a CaptureSnapshot instance.

Parameters:

lastLogEntry - the last log entry for the snapshot.

replicatedToAllIndex - the index of the last entry replicated to all followers.

Returns:

a new CaptureSnapshot instance.