org.opendaylight.controller.cluster.raft

Class FollowerLogInformation

java.lang.Object

org.opendaylight.controller.cluster.raft.FollowerLogInformation

public final class FollowerLogInformation
extends Object

The state of the followers log as known by the Leader.

Author:

Moiz Raja, Thomas Pantelis

Field Summary

Fields

Modifier and Type	Field and Description
static long	NO_INDEX

Constructor Summary

Constructors

Constructor and Description
FollowerLogInformation(PeerInfo peerInfo, RaftActorContext context) Constructs an instance with no matching index.

Method Summary

Modifier and Type	Method and Description
void	clearLeaderInstallSnapshotState() Clears the LeaderInstallSnapshotState when an install snapshot is complete.
boolean	decrNextIndex() Decrements the value of the follower's next index.
String	getId() Returns the identifier of the follower.
LeaderInstallSnapshotState	getInstallSnapshotState() Returns the LeaderInstallSnapshotState for the in progress install snapshot.
long	getMatchIndex() Returns the index of highest log entry known to be replicated on the follower.
long	getNextIndex() Returns the index of the next log entry to send to the follower.
short	getPayloadVersion() Returns the log entry payload data version of the follower.
short	getRaftVersion() Returns the the raft version of the follower.
long	incrMatchIndex() Increments the value of the follower's match index.
boolean	isFollowerActive() Checks if the follower is active by comparing the time of the last activity with the election time out.
boolean	isLogEntrySlicingInProgress() Return whether or not log entry slicing is currently in progress.
void	markFollowerActive() Marks the follower as active.
void	markFollowerInActive() Marks the follower as inactive.
boolean	okToReplicate() This method checks if the next replicate message can be sent to the follower.
void	setLeaderInstallSnapshotState(LeaderInstallSnapshotState state) Sets the LeaderInstallSnapshotState when an install snapshot is initiated.
boolean	setMatchIndex(long matchIndex) Sets the index of the follower's highest log entry.
boolean	setNextIndex(long nextIndex) Sets the index of the follower's next log entry.
void	setPayloadVersion(short payloadVersion) Sets the payload data version of the follower.
void	setRaftVersion(short raftVersion) Sets the raft version of the follower.
void	setSlicedLogEntryIndex(long index) Sets the index of the log entry whose payload size exceeds the maximum size for a single message and thus needs to be sliced into smaller chunks.
long	timeSinceLastActivity() Returns the time since the last activity occurred for the follower.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

NO_INDEX

public static final long NO_INDEX

See Also:

Constant Field Values

Constructor Detail

FollowerLogInformation

public FollowerLogInformation(PeerInfo peerInfo,
                              RaftActorContext context)

Constructs an instance with no matching index.

Parameters:

peerInfo - the associated PeerInfo of the follower.

context - the RaftActorContext.

Method Detail

decrNextIndex

public boolean decrNextIndex()

Decrements the value of the follower's next index.

Returns:

true if the next index was decremented, ie it was previously >= 0, false otherwise.

setNextIndex

public boolean setNextIndex(long nextIndex)

Sets the index of the follower's next log entry.

Parameters:

nextIndex - the new index.

Returns:

true if the new index differed from the current index and the current index was updated, false otherwise.

incrMatchIndex

public long incrMatchIndex()

Increments the value of the follower's match index.

Returns:

the new value of matchIndex.

setMatchIndex

public boolean setMatchIndex(long matchIndex)

Sets the index of the follower's highest log entry.

Parameters:

matchIndex - the new index.

Returns:

true if the new index differed from the current index and the current index was updated, false otherwise.

getId

public String getId()

Returns the identifier of the follower.

Returns:

the identifier of the follower.

getNextIndex

public long getNextIndex()

Returns the index of the next log entry to send to the follower.

Returns:

index of the follower's next log entry.

getMatchIndex

public long getMatchIndex()

Returns the index of highest log entry known to be replicated on the follower.

Returns:

the index of highest log entry.

isFollowerActive

public boolean isFollowerActive()

Checks if the follower is active by comparing the time of the last activity with the election time out. The follower is active if some activity has occurred for the follower within the election time out interval.

Returns:

true if follower is active, false otherwise.

markFollowerActive

public void markFollowerActive()

Marks the follower as active. This should be called when some activity has occurred for the follower.

markFollowerInActive

public void markFollowerInActive()

Marks the follower as inactive. This should only be called from unit tests.

timeSinceLastActivity

public long timeSinceLastActivity()

Returns the time since the last activity occurred for the follower.

Returns:

time in milliseconds since the last activity from the follower.

okToReplicate

public boolean okToReplicate()

This method checks if the next replicate message can be sent to the follower. This is an optimization to avoid sending duplicate message too frequently if the last replicate message was sent and no reply has been received yet within the current heart beat interval

Returns:

true if it is OK to replicate, false otherwise

getPayloadVersion

public short getPayloadVersion()

Returns the log entry payload data version of the follower.

Returns:

the payload data version.

setPayloadVersion

public void setPayloadVersion(short payloadVersion)

Sets the payload data version of the follower.

Parameters:

payloadVersion - the payload data version.

getRaftVersion

public short getRaftVersion()

Returns the the raft version of the follower.

Returns:

the raft version of the follower.

setRaftVersion

public void setRaftVersion(short raftVersion)

Sets the raft version of the follower.

Parameters:

raftVersion - the raft version.

getInstallSnapshotState

@Nullable
public LeaderInstallSnapshotState getInstallSnapshotState()

Returns the LeaderInstallSnapshotState for the in progress install snapshot.

Returns:

the LeaderInstallSnapshotState if a snapshot install is in progress, null otherwise.

setLeaderInstallSnapshotState

public void setLeaderInstallSnapshotState(@Nonnull
                                          LeaderInstallSnapshotState state)

Sets the LeaderInstallSnapshotState when an install snapshot is initiated.

Parameters:

state - the LeaderInstallSnapshotState

clearLeaderInstallSnapshotState

public void clearLeaderInstallSnapshotState()

Clears the LeaderInstallSnapshotState when an install snapshot is complete.

setSlicedLogEntryIndex

public void setSlicedLogEntryIndex(long index)

Sets the index of the log entry whose payload size exceeds the maximum size for a single message and thus needs to be sliced into smaller chunks.

Parameters:

index - the log entry index or NO_INDEX to clear it

isLogEntrySlicingInProgress

public boolean isLogEntrySlicingInProgress()

Return whether or not log entry slicing is currently in progress.

Returns:

true if slicing is currently in progress, false otherwise

toString

public String toString()

Overrides:

toString in class Object