X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?p=controller.git;a=blobdiff_plain;f=opendaylight%2Fmd-sal%2Fsal-distributed-datastore%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fcontroller%2Fcluster%2Fdatastore%2Fentityownership%2FEntityOwnershipShard.java;h=76a6ac1e8f61beaf362b3851412e612a7cc4d0f8;hp=a71c86dd9f3f165b8e254e3918a0f9dfacdda811;hb=15c366198fa48eefd94f4d1a72faa9833e988250;hpb=02f738dec4a31bdad04e42b2c19ecf09aacc0b87 diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/entityownership/EntityOwnershipShard.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/entityownership/EntityOwnershipShard.java index a71c86dd9f..76a6ac1e8f 100644 --- a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/entityownership/EntityOwnershipShard.java +++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/entityownership/EntityOwnershipShard.java @@ -7,20 +7,27 @@ */ 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 static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_NODE_ID; import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_OWNERS_PATH; import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_OWNER_NODE_ID; import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_OWNER_QNAME; import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_TYPES_PATH; +import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_TYPE_NODE_ID; +import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_TYPE_QNAME; +import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.candidateMapEntry; +import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.candidateNodeKey; import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.candidatePath; +import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.createEntity; import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.entityOwnersWithCandidate; import akka.actor.ActorRef; import akka.actor.ActorSelection; -import akka.actor.Props; +import akka.actor.Cancellable; import akka.pattern.Patterns; import com.google.common.base.Optional; +import com.google.common.base.Preconditions; import com.google.common.base.Strings; import java.util.ArrayList; import java.util.Collection; @@ -34,7 +41,12 @@ import org.opendaylight.controller.cluster.datastore.Shard; import org.opendaylight.controller.cluster.datastore.entityownership.messages.CandidateAdded; import org.opendaylight.controller.cluster.datastore.entityownership.messages.CandidateRemoved; import org.opendaylight.controller.cluster.datastore.entityownership.messages.RegisterCandidateLocal; +import org.opendaylight.controller.cluster.datastore.entityownership.messages.RegisterListenerLocal; +import org.opendaylight.controller.cluster.datastore.entityownership.messages.SelectOwner; import org.opendaylight.controller.cluster.datastore.entityownership.messages.UnregisterCandidateLocal; +import org.opendaylight.controller.cluster.datastore.entityownership.messages.UnregisterListenerLocal; +import org.opendaylight.controller.cluster.datastore.entityownership.selectionstrategy.EntityOwnerSelectionStrategy; +import org.opendaylight.controller.cluster.datastore.entityownership.selectionstrategy.EntityOwnerSelectionStrategyConfig; import org.opendaylight.controller.cluster.datastore.identifiers.ShardIdentifier; import org.opendaylight.controller.cluster.datastore.messages.BatchedModifications; import org.opendaylight.controller.cluster.datastore.messages.PeerDown; @@ -45,15 +57,13 @@ import org.opendaylight.controller.cluster.datastore.modification.MergeModificat 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; import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode; -import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeSnapshot; import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes; -import org.opendaylight.yangtools.yang.model.api.SchemaContext; import scala.concurrent.Future; +import scala.concurrent.duration.FiniteDuration; /** * Special Shard for EntityOwnership. @@ -66,19 +76,24 @@ class EntityOwnershipShard extends Shard { private final EntityOwnershipListenerSupport listenerSupport; private final Set downPeerMemberNames = new HashSet<>(); private final Map peerIdToMemberNames = new HashMap<>(); + private final EntityOwnerSelectionStrategyConfig strategyConfig; + private final Map entityToScheduledOwnershipTask = new HashMap<>(); + private final EntityOwnershipStatistics entityOwnershipStatistics; private static DatastoreContext noPersistenceDatastoreContext(DatastoreContext datastoreContext) { return DatastoreContext.newBuilderFrom(datastoreContext).persistent(false).build(); } - protected EntityOwnershipShard(ShardIdentifier name, Map peerAddresses, - DatastoreContext datastoreContext, SchemaContext schemaContext, String localMemberName) { - super(name, peerAddresses, noPersistenceDatastoreContext(datastoreContext), schemaContext); - this.localMemberName = localMemberName; - this.commitCoordinator = new EntityOwnershipShardCommitCoordinator(localMemberName, LOG); - this.listenerSupport = new EntityOwnershipListenerSupport(getContext()); + protected EntityOwnershipShard(Builder builder) { + super(builder); + this.localMemberName = builder.localMemberName; + this.commitCoordinator = new EntityOwnershipShardCommitCoordinator(builder.localMemberName, LOG); + this.listenerSupport = new EntityOwnershipListenerSupport(getContext(), persistenceId()); + this.strategyConfig = builder.ownerSelectionStrategyConfig; + this.entityOwnershipStatistics = new EntityOwnershipStatistics(); + this.entityOwnershipStatistics.init(getDataStore()); - for(String peerId: peerAddresses.keySet()) { + for(String peerId: getRaftActorContext().getPeerIds()) { ShardIdentifier shardId = ShardIdentifier.builder().fromShardIdString(peerId).build(); peerIdToMemberNames.put(peerId, shardId.getMemberName()); } @@ -93,14 +108,14 @@ class EntityOwnershipShard extends Shard { protected void onRecoveryComplete() { super.onRecoveryComplete(); - new CandidateListChangeListener(getSelf()).init(getDataStore()); + new CandidateListChangeListener(getSelf(), persistenceId()).init(getDataStore()); new EntityOwnerChangeListener(localMemberName, listenerSupport).init(getDataStore()); } @Override - public void onReceiveCommand(final Object message) throws Exception { + public void handleCommand(final Object message) { if(message instanceof RegisterCandidateLocal) { - onRegisterCandidateLocal((RegisterCandidateLocal)message); + onRegisterCandidateLocal((RegisterCandidateLocal) message); } else if(message instanceof UnregisterCandidateLocal) { onUnregisterCandidateLocal((UnregisterCandidateLocal)message); } else if(message instanceof CandidateAdded){ @@ -111,15 +126,41 @@ class EntityOwnershipShard extends Shard { onPeerDown((PeerDown) message); } else if(message instanceof PeerUp) { onPeerUp((PeerUp) message); + } else if(message instanceof RegisterListenerLocal) { + onRegisterListenerLocal((RegisterListenerLocal)message); + } else if(message instanceof UnregisterListenerLocal) { + onUnregisterListenerLocal((UnregisterListenerLocal) message); + } else if(message instanceof SelectOwner) { + onSelectOwner((SelectOwner) message); } else if(!commitCoordinator.handleMessage(message, this)) { - super.onReceiveCommand(message); + super.handleCommand(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(currentOwner, selectOwner.getAllCandidates(), + entityOwnershipStatistics.byEntityType(entityType), + selectOwner.getOwnerSelectionStrategy())); + + Cancellable cancellable = entityToScheduledOwnershipTask.get(selectOwner.getEntityPath()); + if(cancellable != null){ + if(!cancellable.isCancelled()){ + cancellable.cancel(); + } + entityToScheduledOwnershipTask.remove(selectOwner.getEntityPath()); + } } } private void onRegisterCandidateLocal(RegisterCandidateLocal registerCandidate) { LOG.debug("{}: onRegisterCandidateLocal: {}", persistenceId(), registerCandidate); - listenerSupport.addEntityOwnershipListener(registerCandidate.getEntity(), registerCandidate.getCandidate()); + listenerSupport.setHasCandidateForEntity(registerCandidate.getEntity()); NormalizedNode entityOwners = entityOwnersWithCandidate(registerCandidate.getEntity().getType(), registerCandidate.getEntity().getId(), localMemberName); @@ -132,7 +173,7 @@ class EntityOwnershipShard extends Shard { LOG.debug("{}: onUnregisterCandidateLocal: {}", persistenceId(), unregisterCandidate); Entity entity = unregisterCandidate.getEntity(); - listenerSupport.removeEntityOwnershipListener(entity, unregisterCandidate.getCandidate()); + listenerSupport.unsetHasCandidateForEntity(entity); YangInstanceIdentifier candidatePath = candidatePath(entity.getType(), entity.getId(), localMemberName); commitCoordinator.commitModification(new DeleteModification(candidatePath), this); @@ -140,6 +181,49 @@ class EntityOwnershipShard extends Shard { getSender().tell(SuccessReply.INSTANCE, getSelf()); } + private void onRegisterListenerLocal(final RegisterListenerLocal registerListener) { + LOG.debug("{}: onRegisterListenerLocal: {}", persistenceId(), registerListener); + + listenerSupport.addEntityOwnershipListener(registerListener.getEntityType(), registerListener.getListener()); + + getSender().tell(SuccessReply.INSTANCE, getSelf()); + + searchForEntities(new EntityWalker() { + @Override + public void onEntity(MapEntryNode entityTypeNode, MapEntryNode entityNode) { + Optional> 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> 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, isOwner, hasOwner, + registerListener.getListener()); + } + } + }); + } + + private void onUnregisterListenerLocal(UnregisterListenerLocal unregisterListener) { + LOG.debug("{}: onUnregisterListenerLocal: {}", persistenceId(), unregisterListener); + + listenerSupport.removeEntityOwnershipListener(unregisterListener.getEntityType(), unregisterListener.getListener()); + + getSender().tell(SuccessReply.INSTANCE, getSelf()); + } + void tryCommitModifications(final BatchedModifications modifications) { if(isLeader()) { LOG.debug("{}: Committing BatchedModifications {} locally", persistenceId(), modifications.getTransactionID()); @@ -173,17 +257,28 @@ class EntityOwnershipShard extends Shard { 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()) { + if(isLeader) { + + // 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(); // We were just elected leader. If the old leader is down, select new owners for the entities // owned by the down leader. @@ -192,24 +287,50 @@ class EntityOwnershipShard extends Shard { LOG.debug("{}: oldLeaderMemberName: {}", persistenceId(), oldLeaderMemberName); if(downPeerMemberNames.contains(oldLeaderMemberName)) { - selectNewOwnerForEntitiesOwnedBy(oldLeaderMemberName); + removeCandidateFromEntities(oldLeaderMemberName); } + } 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); } } private void onCandidateRemoved(CandidateRemoved message) { - if(!isLeader()) { - return; - } - LOG.debug("{}: onCandidateRemoved: {}", persistenceId(), message); - String currentOwner = getCurrentOwner(message.getEntityPath()); - if(message.getRemovedCandidate().equals(currentOwner)){ - writeNewOwner(message.getEntityPath(), newOwner(message.getRemainingCandidates())); + if(isLeader()) { + String currentOwner = getCurrentOwner(message.getEntityPath()); + if(message.getRemovedCandidate().equals(currentOwner) || message.getRemainingCandidates().size() == 0){ + String entityType = EntityOwnersModel.entityTypeFromEntityPath(message.getEntityPath()); + writeNewOwner(message.getEntityPath(), + newOwner(currentOwner, message.getRemainingCandidates(), entityOwnershipStatistics.byEntityType(entityType), + getEntityOwnerElectionStrategy(message.getEntityPath()))); + } + } else { + // We're not the leader. If the removed candidate is our local member then check if we actually + // have a local candidate registered. If we do then we must have been partitioned from the leader + // and the leader removed our candidate since the leader can't tell the difference between a + // temporary network partition and a node's process actually restarted. So, in that case, re-add + // our candidate. + if(localMemberName.equals(message.getRemovedCandidate()) && + listenerSupport.hasCandidateForEntity(createEntity(message.getEntityPath()))) { + LOG.debug("Local candidate member was removed but a local candidate is registered for {}" + + " - adding back local candidate", message.getEntityPath()); + + commitCoordinator.commitModification(new MergeModification( + candidatePath(message.getEntityPath(), localMemberName), + candidateMapEntry(localMemberName)), this); + } } } + private EntityOwnerSelectionStrategy getEntityOwnerElectionStrategy(YangInstanceIdentifier entityPath) { + final String entityType = EntityOwnersModel.entityTypeFromEntityPath(entityPath); + return strategyConfig.createStrategy(entityType, entityOwnershipStatistics.byEntityType(entityType)); + } + private void onCandidateAdded(CandidateAdded message) { if(!isLeader()){ return; @@ -217,19 +338,42 @@ class EntityOwnershipShard extends Shard { LOG.debug("{}: onCandidateAdded: {}", persistenceId(), message); - String currentOwner = getCurrentOwner(message.getEntityPath()); + // Since a node's candidate member is only added by the node itself, we can assume the node is up so + // remove it from the downPeerMemberNames. + downPeerMemberNames.remove(message.getNewCandidate()); + + 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", persistenceId(), strategy); if(Strings.isNullOrEmpty(currentOwner)){ - writeNewOwner(message.getEntityPath(), newOwner(message.getAllCandidates())); + if(strategy.getSelectionDelayInMillis() == 0L) { + 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); + } } } private void onPeerDown(PeerDown peerDown) { - LOG.debug("{}: onPeerDown: {}", persistenceId(), peerDown); + LOG.info("{}: onPeerDown: {}", persistenceId(), peerDown); String downMemberName = peerDown.getMemberName(); if(downPeerMemberNames.add(downMemberName) && isLeader()) { - // Select new owners for entities owned by the down peer. - selectNewOwnerForEntitiesOwnedBy(downMemberName); + // Remove the down peer as a candidate from all entities. + removeCandidateFromEntities(downMemberName); } } @@ -237,60 +381,58 @@ class EntityOwnershipShard extends Shard { LOG.debug("{}: onPeerUp: {}", persistenceId(), peerUp); peerIdToMemberNames.put(peerUp.getPeerId(), peerUp.getMemberName()); + downPeerMemberNames.remove(peerUp.getMemberName()); - if(downPeerMemberNames.remove(peerUp.getMemberName()) && isLeader()) { - // This peer was previously down - for its previously owned entities, if there were no other - // candidates, the owner would have been cleared so handle that here by trying to re-assign - // ownership for entities whose owner is cleared. - selectNewOwnerForEntitiesOwnedBy(""); - } + // 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) { + final BatchedModifications modifications = commitCoordinator.newBatchedModifications(); + searchForEntities(new EntityWalker() { + @Override + public void onEntity(MapEntryNode entityTypeNode, MapEntryNode entityNode) { + if (hasCandidate(entityNode, owner)) { + YangInstanceIdentifier entityId = + (YangInstanceIdentifier) entityNode.getIdentifier().getKeyValues().get(ENTITY_ID_QNAME); + YangInstanceIdentifier candidatePath = candidatePath( + entityTypeNode.getIdentifier().getKeyValues().get(ENTITY_TYPE_QNAME).toString(), + entityId, owner); + + LOG.info("{}: Found entity {}, removing candidate {}, path {}", persistenceId(), entityId, + owner, candidatePath); + + modifications.addModification(new DeleteModification(candidatePath)); + } + } + }); + + commitCoordinator.commitModifications(modifications, this); } - private void selectNewOwnerForEntitiesOwnedBy(String owner) { - DataTreeSnapshot snapshot = getDataStore().getDataTree().takeSnapshot(); - Optional> possibleEntityTypes = snapshot.readNode(ENTITY_TYPES_PATH); + private static boolean hasCandidate(MapEntryNode entity, String candidateName) { + return ((MapNode)entity.getChild(CANDIDATE_NODE_ID).get()).getChild(candidateNodeKey(candidateName)).isPresent(); + } + + private void searchForEntities(EntityWalker walker) { + Optional> possibleEntityTypes = getDataStore().readNode(ENTITY_TYPES_PATH); if(!possibleEntityTypes.isPresent()) { return; } - LOG.debug("{}: Searching for entities owned by {}", persistenceId(), owner); - - BatchedModifications modifications = commitCoordinator.newBatchedModifications(); for(MapEntryNode entityType: ((MapNode) possibleEntityTypes.get()).getValue()) { - Optional> possibleEntities = - entityType.getChild(ENTITY_NODE_ID); + Optional> 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()) { - Optional> possibleOwner = - entity.getChild(ENTITY_OWNER_NODE_ID); - if(possibleOwner.isPresent() && owner.equals(possibleOwner.get().getValue().toString())) { - Object newOwner = newOwner(getCandidateNames(entity)); - YangInstanceIdentifier entityPath = YangInstanceIdentifier.builder(ENTITY_TYPES_PATH). - node(entityType.getIdentifier()).node(ENTITY_NODE_ID).node(entity.getIdentifier()). - node(ENTITY_OWNER_NODE_ID).build(); - - LOG.debug("{}: Found entity {}, writing new owner {}", persistenceId(), entityPath, newOwner); - - modifications.addModification(new WriteModification(entityPath, - ImmutableNodes.leafNode(ENTITY_OWNER_NODE_ID, newOwner))); - } + walker.onEntity(entityType, entity); } } - - commitCoordinator.commitModifications(modifications, this); - } - - private Collection getCandidateNames(MapEntryNode entity) { - Collection candidates = ((MapNode)entity.getChild(CANDIDATE_NODE_ID).get()).getValue(); - Collection 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) { @@ -300,45 +442,93 @@ class EntityOwnershipShard extends Shard { ImmutableNodes.leafNode(ENTITY_OWNER_NODE_ID, newOwner)), this); } - private String newOwner(Collection candidates) { - for(String candidate: candidates) { - if(!downPeerMemberNames.contains(candidate)) { - return candidate; - } + /** + * Schedule a new owner selection job. Cancelling any outstanding job if it has not been cancelled. + * + * @param entityPath + * @param allCandidates + */ + public void scheduleOwnerSelection(YangInstanceIdentifier entityPath, Collection allCandidates, + EntityOwnerSelectionStrategy strategy){ + 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 void cancelOwnerSelectionTask(YangInstanceIdentifier entityPath){ + final Cancellable lastScheduledTask = entityToScheduledOwnershipTask.get(entityPath); + if(lastScheduledTask != null && !lastScheduledTask.isCancelled()){ + lastScheduledTask.cancel(); + } + } + + private String newOwner(String currentOwner, Collection candidates, Map statistics, EntityOwnerSelectionStrategy ownerSelectionStrategy) { + Collection viableCandidates = getViableCandidates(candidates); + if(viableCandidates.size() == 0){ + return ""; } + return ownerSelectionStrategy.newOwner(currentOwner, viableCandidates); + } + + private Collection getViableCandidates(Collection candidates) { + Collection viableCandidates = new ArrayList<>(); - return ""; + for (String candidate : candidates) { + if (!downPeerMemberNames.contains(candidate)) { + viableCandidates.add(candidate); + } + } + return viableCandidates; } private String getCurrentOwner(YangInstanceIdentifier entityId) { - DataTreeSnapshot snapshot = getDataStore().getDataTree().takeSnapshot(); - Optional> optionalEntityOwner = snapshot.readNode(entityId.node(ENTITY_OWNER_QNAME)); + Optional> optionalEntityOwner = getDataStore().readNode(entityId.node(ENTITY_OWNER_QNAME)); if(optionalEntityOwner.isPresent()){ return optionalEntityOwner.get().getValue().toString(); } return null; } - public static Props props(final ShardIdentifier name, final Map peerAddresses, - final DatastoreContext datastoreContext, final SchemaContext schemaContext, final String localMemberName) { - return Props.create(new Creator(name, peerAddresses, datastoreContext, schemaContext, localMemberName)); + private static interface EntityWalker { + void onEntity(MapEntryNode entityTypeNode, MapEntryNode entityNode); } - private static class Creator extends AbstractShardCreator { - private static final long serialVersionUID = 1L; + public static Builder newBuilder() { + return new Builder(); + } - private final String localMemberName; + static class Builder extends Shard.AbstractBuilder { + private String localMemberName; + private EntityOwnerSelectionStrategyConfig ownerSelectionStrategyConfig; - Creator(final ShardIdentifier name, final Map peerAddresses, - final DatastoreContext datastoreContext, final SchemaContext schemaContext, - final String localMemberName) { - super(name, peerAddresses, datastoreContext, schemaContext); + protected Builder() { + super(EntityOwnershipShard.class); + } + + Builder localMemberName(String localMemberName) { + checkSealed(); this.localMemberName = localMemberName; + return this; + } + + Builder ownerSelectionStrategyConfig(EntityOwnerSelectionStrategyConfig ownerSelectionStrategyConfig){ + checkSealed(); + this.ownerSelectionStrategyConfig = ownerSelectionStrategyConfig; + return this; } @Override - public Shard create() throws Exception { - return new EntityOwnershipShard(name, peerAddresses, datastoreContext, schemaContext, localMemberName); + protected void verify() { + super.verify(); + Preconditions.checkNotNull(localMemberName, "localMemberName should not be null"); + Preconditions.checkNotNull(ownerSelectionStrategyConfig, "ownerSelectionStrategyConfig should not be null"); } } }