*/
package org.opendaylight.controller.cluster.datastore.entityownership;
-import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.CANDIDATE_NAME_NODE_ID;
import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.CANDIDATE_NODE_ID;
import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_ID_NODE_ID;
import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_ID_QNAME;
import org.opendaylight.controller.cluster.datastore.modification.WriteModification;
import org.opendaylight.controller.md.sal.common.api.clustering.Entity;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
-import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
import org.opendaylight.yangtools.yang.data.api.schema.MapNode;
}
@Override
- public void onReceiveCommand(final Object message) throws Exception {
+ public void handleNonRaftCommand(final Object message) {
if(message instanceof RegisterCandidateLocal) {
onRegisterCandidateLocal((RegisterCandidateLocal) message);
} else if(message instanceof UnregisterCandidateLocal) {
} else if(message instanceof SelectOwner) {
onSelectOwner((SelectOwner) message);
} else if(!commitCoordinator.handleMessage(message, this)) {
- super.onReceiveCommand(message);
+ super.handleNonRaftCommand(message);
}
}
private void onSelectOwner(SelectOwner selectOwner) {
+ LOG.debug("{}: onSelectOwner: {}", persistenceId(), selectOwner);
+
String currentOwner = getCurrentOwner(selectOwner.getEntityPath());
if(Strings.isNullOrEmpty(currentOwner)) {
String entityType = EntityOwnersModel.entityTypeFromEntityPath(selectOwner.getEntityPath());
- writeNewOwner(selectOwner.getEntityPath(), newOwner(selectOwner.getAllCandidates(),
+ writeNewOwner(selectOwner.getEntityPath(), newOwner(currentOwner, selectOwner.getAllCandidates(),
entityOwnershipStatistics.byEntityType(entityType),
selectOwner.getOwnerSelectionStrategy()));
getSender().tell(SuccessReply.INSTANCE, getSelf());
- searchForEntitiesOwnedBy(localMemberName, new EntityWalker() {
+ searchForEntities(new EntityWalker() {
@Override
public void onEntity(MapEntryNode entityTypeNode, MapEntryNode entityNode) {
- Optional<DataContainerChild<? extends PathArgument, ?>> possibleType =
- entityTypeNode.getChild(ENTITY_TYPE_NODE_ID);
+ Optional<DataContainerChild<?, ?>> possibleType = entityTypeNode.getChild(ENTITY_TYPE_NODE_ID);
String entityType = possibleType.isPresent() ? possibleType.get().getValue().toString() : null;
if (registerListener.getEntityType().equals(entityType)) {
+ final boolean hasOwner;
+ final boolean isOwner;
+
+ Optional<DataContainerChild<?, ?>> possibleOwner = entityNode.getChild(ENTITY_OWNER_NODE_ID);
+ if (possibleOwner.isPresent()) {
+ isOwner = localMemberName.equals(possibleOwner.get().getValue().toString());
+ hasOwner = true;
+ } else {
+ isOwner = false;
+ hasOwner = false;
+ }
+
Entity entity = new Entity(entityType,
- (YangInstanceIdentifier) entityNode.getChild(ENTITY_ID_NODE_ID).get().getValue());
- listenerSupport.notifyEntityOwnershipListener(entity, false, true, true, registerListener.getListener());
+ (YangInstanceIdentifier) entityNode.getChild(ENTITY_ID_NODE_ID).get().getValue());
+
+ listenerSupport.notifyEntityOwnershipListener(entity, false, isOwner, hasOwner,
+ registerListener.getListener());
}
}
});
protected void onStateChanged() {
super.onStateChanged();
- commitCoordinator.onStateChanged(this, isLeader());
+ boolean isLeader = isLeader();
+ if(LOG.isDebugEnabled()) {
+ LOG.debug("{}: onStateChanged: isLeader: {}, hasLeader: {}", persistenceId(), isLeader, hasLeader());
+ }
+
+ commitCoordinator.onStateChanged(this, isLeader);
}
@Override
protected void onLeaderChanged(String oldLeader, String newLeader) {
super.onLeaderChanged(oldLeader, newLeader);
+ boolean isLeader = isLeader();
LOG.debug("{}: onLeaderChanged: oldLeader: {}, newLeader: {}, isLeader: {}", persistenceId(), oldLeader,
- newLeader, isLeader());
+ newLeader, isLeader);
- if(isLeader()) {
- // We were just elected leader. If the old leader is down, select new owners for the entities
- // owned by the down leader.
+ if(isLeader) {
- String oldLeaderMemberName = peerIdToMemberNames.get(oldLeader);
+ // Clear all existing strategies so that they get re-created when we call createStrategy again
+ // This allows the strategies to be re-initialized with existing statistics maintained by
+ // EntityOwnershipStatistics
+ strategyConfig.clearStrategies();
- LOG.debug("{}: oldLeaderMemberName: {}", persistenceId(), oldLeaderMemberName);
-
- if(downPeerMemberNames.contains(oldLeaderMemberName)) {
- selectNewOwnerForEntitiesOwnedBy(oldLeaderMemberName);
+ // Remove the candidates for all members that are known to be down. In a cluster which has greater than
+ // 3 nodes it is possible for a some node beside the leader being down when the leadership transitions
+ // it makes sense to use this event to remove all the candidates for those downed nodes
+ for(String downPeerName : downPeerMemberNames){
+ removeCandidateFromEntities(downPeerName);
}
+ } else {
+ // The leader changed - notify the coordinator to check if pending modifications need to be sent.
+ // While onStateChanged also does this, this method handles the case where the shard hears from a
+ // leader and stays in the follower state. In that case no behavior state change occurs.
+ commitCoordinator.onStateChanged(this, isLeader);
}
}
if(message.getRemovedCandidate().equals(currentOwner) || message.getRemainingCandidates().size() == 0){
String entityType = EntityOwnersModel.entityTypeFromEntityPath(message.getEntityPath());
writeNewOwner(message.getEntityPath(),
- newOwner(message.getRemainingCandidates(), entityOwnershipStatistics.byEntityType(entityType),
+ newOwner(currentOwner, message.getRemainingCandidates(), entityOwnershipStatistics.byEntityType(entityType),
getEntityOwnerElectionStrategy(message.getEntityPath())));
}
} else {
private EntityOwnerSelectionStrategy getEntityOwnerElectionStrategy(YangInstanceIdentifier entityPath) {
final String entityType = EntityOwnersModel.entityTypeFromEntityPath(entityPath);
- return strategyConfig.createStrategy(entityType);
+ return strategyConfig.createStrategy(entityType, entityOwnershipStatistics.byEntityType(entityType));
}
private void onCandidateAdded(CandidateAdded message) {
// remove it from the downPeerMemberNames.
downPeerMemberNames.remove(message.getNewCandidate());
- String currentOwner = getCurrentOwner(message.getEntityPath());
- EntityOwnerSelectionStrategy strategy = getEntityOwnerElectionStrategy(message.getEntityPath());
- if(Strings.isNullOrEmpty(currentOwner)){
+ final String currentOwner = getCurrentOwner(message.getEntityPath());
+ final EntityOwnerSelectionStrategy strategy = getEntityOwnerElectionStrategy(message.getEntityPath());
+ final String entityType = EntityOwnersModel.entityTypeFromEntityPath(message.getEntityPath());
+
+ // Available members is all the known peers - the number of peers that are down + self
+ // So if there are 2 peers and 1 is down then availableMembers will be 2
+ final int availableMembers = (peerIdToMemberNames.size() - downPeerMemberNames.size()) + 1;
+
+ LOG.debug("{}: Using strategy {} to select owner, currentOwner = {}", persistenceId(), strategy, currentOwner);
+
+ if(!message.getAllCandidates().contains(currentOwner)){
if(strategy.getSelectionDelayInMillis() == 0L) {
- String entityType = EntityOwnersModel.entityTypeFromEntityPath(message.getEntityPath());
- writeNewOwner(message.getEntityPath(), newOwner(message.getAllCandidates(),
+ writeNewOwner(message.getEntityPath(), newOwner(currentOwner, message.getAllCandidates(),
+ entityOwnershipStatistics.byEntityType(entityType), strategy));
+ } else if(message.getAllCandidates().size() == availableMembers) {
+ LOG.debug("{}: Received the maximum candidates requests : {} writing new owner",
+ persistenceId(), availableMembers);
+ cancelOwnerSelectionTask(message.getEntityPath());
+ writeNewOwner(message.getEntityPath(), newOwner(currentOwner, message.getAllCandidates(),
entityOwnershipStatistics.byEntityType(entityType), strategy));
} else {
scheduleOwnerSelection(message.getEntityPath(), message.getAllCandidates(), strategy);
peerIdToMemberNames.put(peerUp.getPeerId(), peerUp.getMemberName());
downPeerMemberNames.remove(peerUp.getMemberName());
- }
-
- private void selectNewOwnerForEntitiesOwnedBy(String owner) {
- final BatchedModifications modifications = commitCoordinator.newBatchedModifications();
- searchForEntitiesOwnedBy(owner, new EntityWalker() {
- @Override
- public void onEntity(MapEntryNode entityTypeNode, MapEntryNode entityNode) {
-
- YangInstanceIdentifier entityPath = YangInstanceIdentifier.builder(ENTITY_TYPES_PATH).
- node(entityTypeNode.getIdentifier()).node(ENTITY_NODE_ID).node(entityNode.getIdentifier()).
- node(ENTITY_OWNER_NODE_ID).build();
-
- String entityType = EntityOwnersModel.entityTypeFromEntityPath(entityPath);
- Object newOwner = newOwner(getCandidateNames(entityNode),
- entityOwnershipStatistics.byEntityType(entityType),
- getEntityOwnerElectionStrategy(entityPath));
-
- LOG.debug("{}: Found entity {}, writing new owner {}", persistenceId(), entityPath, newOwner);
-
- modifications.addModification(new WriteModification(entityPath,
- ImmutableNodes.leafNode(ENTITY_OWNER_NODE_ID, newOwner)));
- }
- });
-
- commitCoordinator.commitModifications(modifications, this);
+ // Notify the coordinator to check if pending modifications need to be sent. We do this here
+ // to handle the case where the leader's peer address isn't now yet when a prior state or
+ // leader change occurred.
+ commitCoordinator.onStateChanged(this, isLeader());
}
private void removeCandidateFromEntities(final String owner) {
return ((MapNode)entity.getChild(CANDIDATE_NODE_ID).get()).getChild(candidateNodeKey(candidateName)).isPresent();
}
- private void searchForEntitiesOwnedBy(final String owner, final EntityWalker walker) {
- Optional<NormalizedNode<?, ?>> possibleEntityTypes = getDataStore().readNode(ENTITY_TYPES_PATH);
- if(!possibleEntityTypes.isPresent()) {
- return;
- }
-
- LOG.debug("{}: Searching for entities owned by {}", persistenceId(), owner);
-
- searchForEntities(new EntityWalker() {
- @Override
- public void onEntity(MapEntryNode entityTypeNode, MapEntryNode entityNode) {
- Optional<DataContainerChild<? extends PathArgument, ?>> possibleOwner =
- entityNode.getChild(ENTITY_OWNER_NODE_ID);
- if (possibleOwner.isPresent() && owner.equals(possibleOwner.get().getValue().toString())) {
- walker.onEntity(entityTypeNode, entityNode);
- }
- }
- });
- }
-
private void searchForEntities(EntityWalker walker) {
Optional<NormalizedNode<?, ?>> possibleEntityTypes = getDataStore().readNode(ENTITY_TYPES_PATH);
if(!possibleEntityTypes.isPresent()) {
}
for(MapEntryNode entityType: ((MapNode) possibleEntityTypes.get()).getValue()) {
- Optional<DataContainerChild<? extends PathArgument, ?>> possibleEntities =
- entityType.getChild(ENTITY_NODE_ID);
+ Optional<DataContainerChild<?, ?>> possibleEntities = entityType.getChild(ENTITY_NODE_ID);
if(!possibleEntities.isPresent()) {
- continue; // shouldn't happen but handle anyway
+ // shouldn't happen but handle anyway
+ continue;
}
for(MapEntryNode entity: ((MapNode) possibleEntities.get()).getValue()) {
}
}
- private Collection<String> getCandidateNames(MapEntryNode entity) {
- Collection<MapEntryNode> candidates = ((MapNode) entity.getChild(CANDIDATE_NODE_ID).get()).getValue();
- Collection<String> candidateNames = new ArrayList<>(candidates.size());
- for(MapEntryNode candidate: candidates) {
- candidateNames.add(candidate.getChild(CANDIDATE_NAME_NODE_ID).get().getValue().toString());
- }
-
- return candidateNames;
- }
-
private void writeNewOwner(YangInstanceIdentifier entityPath, String newOwner) {
LOG.debug("{}: Writing new owner {} for entity {}", persistenceId(), newOwner, entityPath);
*/
public void scheduleOwnerSelection(YangInstanceIdentifier entityPath, Collection<String> allCandidates,
EntityOwnerSelectionStrategy strategy){
- Cancellable lastScheduledTask = entityToScheduledOwnershipTask.get(entityPath);
- if(lastScheduledTask != null && !lastScheduledTask.isCancelled()){
- lastScheduledTask.cancel();
- }
- lastScheduledTask = context().system().scheduler().scheduleOnce(
+ cancelOwnerSelectionTask(entityPath);
+
+ LOG.debug("{}: Scheduling owner selection after {} ms", persistenceId(), strategy.getSelectionDelayInMillis());
+
+ final Cancellable lastScheduledTask = context().system().scheduler().scheduleOnce(
FiniteDuration.apply(strategy.getSelectionDelayInMillis(), TimeUnit.MILLISECONDS)
, self(), new SelectOwner(entityPath, allCandidates, strategy)
, context().system().dispatcher(), self());
entityToScheduledOwnershipTask.put(entityPath, lastScheduledTask);
}
- private String newOwner(Collection<String> candidates, Map<String, Long> statistics, EntityOwnerSelectionStrategy ownerSelectionStrategy) {
+ private void cancelOwnerSelectionTask(YangInstanceIdentifier entityPath){
+ final Cancellable lastScheduledTask = entityToScheduledOwnershipTask.get(entityPath);
+ if(lastScheduledTask != null && !lastScheduledTask.isCancelled()){
+ lastScheduledTask.cancel();
+ }
+ }
+
+ private String newOwner(String currentOwner, Collection<String> candidates, Map<String, Long> statistics, EntityOwnerSelectionStrategy ownerSelectionStrategy) {
Collection<String> viableCandidates = getViableCandidates(candidates);
if(viableCandidates.size() == 0){
return "";
}
- return ownerSelectionStrategy.newOwner(viableCandidates, statistics);
+ return ownerSelectionStrategy.newOwner(currentOwner, viableCandidates);
}
private Collection<String> getViableCandidates(Collection<String> candidates) {
Code Review / controller.git / blobdiff