opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ShardManager.java

   1 /*
   2  * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.controller.cluster.datastore;
  10
  11 import akka.actor.ActorPath;
  12 import akka.actor.ActorRef;
  13 import akka.actor.Address;
  14 import akka.actor.Cancellable;
  15 import akka.actor.OneForOneStrategy;
  16 import akka.actor.Props;
  17 import akka.actor.SupervisorStrategy;
  18 import akka.cluster.ClusterEvent;
  19 import akka.japi.Creator;
  20 import akka.japi.Function;
  21 import akka.japi.Procedure;
  22 import akka.persistence.RecoveryCompleted;
  23 import akka.persistence.RecoveryFailure;
  24 import akka.serialization.Serialization;
  25 import com.google.common.annotations.VisibleForTesting;
  26 import com.google.common.base.Objects;
  27 import com.google.common.base.Optional;
  28 import com.google.common.base.Preconditions;
  29 import com.google.common.base.Strings;
  30 import com.google.common.base.Supplier;
  31 import com.google.common.collect.ImmutableSet;
  32 import com.google.common.collect.Sets;
  33 import java.io.Serializable;
  34 import java.util.ArrayList;
  35 import java.util.Collection;
  36 import java.util.Collections;
  37 import java.util.HashMap;
  38 import java.util.HashSet;
  39 import java.util.Iterator;
  40 import java.util.List;
  41 import java.util.Map;
  42 import java.util.Set;
  43 import java.util.concurrent.CountDownLatch;
  44 import org.opendaylight.controller.cluster.DataPersistenceProvider;
  45 import org.opendaylight.controller.cluster.NonPersistentDataProvider;
  46 import org.opendaylight.controller.cluster.PersistentDataProvider;
  47 import org.opendaylight.controller.cluster.common.actor.AbstractUntypedPersistentActorWithMetering;
  48 import org.opendaylight.controller.cluster.datastore.exceptions.NoShardLeaderException;
  49 import org.opendaylight.controller.cluster.datastore.exceptions.NotInitializedException;
  50 import org.opendaylight.controller.cluster.datastore.exceptions.PrimaryNotFoundException;
  51 import org.opendaylight.controller.cluster.datastore.identifiers.ShardIdentifier;
  52 import org.opendaylight.controller.cluster.datastore.identifiers.ShardManagerIdentifier;
  53 import org.opendaylight.controller.cluster.datastore.jmx.mbeans.shardmanager.ShardManagerInfo;
  54 import org.opendaylight.controller.cluster.datastore.jmx.mbeans.shardmanager.ShardManagerInfoMBean;
  55 import org.opendaylight.controller.cluster.datastore.messages.ActorInitialized;
  56 import org.opendaylight.controller.cluster.datastore.messages.FindLocalShard;
  57 import org.opendaylight.controller.cluster.datastore.messages.FindPrimary;
  58 import org.opendaylight.controller.cluster.datastore.messages.LocalPrimaryShardFound;
  59 import org.opendaylight.controller.cluster.datastore.messages.LocalShardFound;
  60 import org.opendaylight.controller.cluster.datastore.messages.LocalShardNotFound;
  61 import org.opendaylight.controller.cluster.datastore.messages.PeerAddressResolved;
  62 import org.opendaylight.controller.cluster.datastore.messages.RemoteFindPrimary;
  63 import org.opendaylight.controller.cluster.datastore.messages.RemotePrimaryShardFound;
  64 import org.opendaylight.controller.cluster.datastore.messages.ShardLeaderStateChanged;
  65 import org.opendaylight.controller.cluster.datastore.messages.UpdateSchemaContext;
  66 import org.opendaylight.controller.cluster.datastore.utils.Dispatchers;
  67 import org.opendaylight.controller.cluster.datastore.utils.PrimaryShardInfoFutureCache;
  68 import org.opendaylight.controller.cluster.notifications.RegisterRoleChangeListener;
  69 import org.opendaylight.controller.cluster.notifications.RoleChangeNotification;
  70 import org.opendaylight.controller.cluster.raft.RaftState;
  71 import org.opendaylight.controller.cluster.raft.base.messages.FollowerInitialSyncUpStatus;
  72 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTree;
  73 import org.opendaylight.yangtools.yang.model.api.ModuleIdentifier;
  74 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  75 import org.slf4j.Logger;
  76 import org.slf4j.LoggerFactory;
  77 import scala.concurrent.duration.Duration;
  78
  79 /**
  80  * The ShardManager has the following jobs,
  81  * <ul>
  82  * <li> Create all the local shard replicas that belong on this cluster member
  83  * <li> Find the address of the local shard
  84  * <li> Find the primary replica for any given shard
  85  * <li> Monitor the cluster members and store their addresses
  86  * <ul>
  87  */
  88 public class ShardManager extends AbstractUntypedPersistentActorWithMetering {
  89
  90     private static final Logger LOG = LoggerFactory.getLogger(ShardManager.class);
  91
  92     // Stores a mapping between a member name and the address of the member
  93     // Member names look like "member-1", "member-2" etc and are as specified
  94     // in configuration
  95     private final Map<String, Address> memberNameToAddress = new HashMap<>();
  96
  97     // Stores a mapping between a shard name and it's corresponding information
  98     // Shard names look like inventory, topology etc and are as specified in
  99     // configuration
 100     private final Map<String, ShardInformation> localShards = new HashMap<>();
 101
 102     // The type of a ShardManager reflects the type of the datastore itself
 103     // A data store could be of type config/operational
 104     private final String type;
 105
 106     private final String shardManagerIdentifierString;
 107
 108     private final ClusterWrapper cluster;
 109
 110     private final Configuration configuration;
 111
 112     private final String shardDispatcherPath;
 113
 114     private ShardManagerInfo mBean;
 115
 116     private DatastoreContext datastoreContext;
 117
 118     private Collection<String> knownModules = Collections.emptySet();
 119
 120     private final DataPersistenceProvider dataPersistenceProvider;
 121
 122     private final CountDownLatch waitTillReadyCountdownLatch;
 123
 124     private final PrimaryShardInfoFutureCache primaryShardInfoCache;
 125
 126     /**
 127      */
 128     protected ShardManager(ClusterWrapper cluster, Configuration configuration,
 129             DatastoreContext datastoreContext, CountDownLatch waitTillReadyCountdownLatch,
 130             PrimaryShardInfoFutureCache primaryShardInfoCache) {
 131
 132         this.cluster = Preconditions.checkNotNull(cluster, "cluster should not be null");
 133         this.configuration = Preconditions.checkNotNull(configuration, "configuration should not be null");
 134         this.datastoreContext = datastoreContext;
 135         this.dataPersistenceProvider = createDataPersistenceProvider(datastoreContext.isPersistent());
 136         this.type = datastoreContext.getDataStoreType();
 137         this.shardManagerIdentifierString = ShardManagerIdentifier.builder().type(type).build().toString();
 138         this.shardDispatcherPath =
 139                 new Dispatchers(context().system().dispatchers()).getDispatcherPath(Dispatchers.DispatcherType.Shard);
 140         this.waitTillReadyCountdownLatch = waitTillReadyCountdownLatch;
 141         this.primaryShardInfoCache = primaryShardInfoCache;
 142
 143         // Subscribe this actor to cluster member events
 144         cluster.subscribeToMemberEvents(getSelf());
 145
 146         createLocalShards();
 147     }
 148
 149     protected DataPersistenceProvider createDataPersistenceProvider(boolean persistent) {
 150         return (persistent) ? new PersistentDataProvider(this) : new NonPersistentDataProvider();
 151     }
 152
 153     public static Props props(
 154         final ClusterWrapper cluster,
 155         final Configuration configuration,
 156         final DatastoreContext datastoreContext,
 157         final CountDownLatch waitTillReadyCountdownLatch,
 158         final PrimaryShardInfoFutureCache primaryShardInfoCache) {
 159
 160         Preconditions.checkNotNull(cluster, "cluster should not be null");
 161         Preconditions.checkNotNull(configuration, "configuration should not be null");
 162         Preconditions.checkNotNull(waitTillReadyCountdownLatch, "waitTillReadyCountdownLatch should not be null");
 163         Preconditions.checkNotNull(primaryShardInfoCache, "primaryShardInfoCache should not be null");
 164
 165         return Props.create(new ShardManagerCreator(cluster, configuration, datastoreContext,
 166                 waitTillReadyCountdownLatch, primaryShardInfoCache));
 167     }
 168
 169     @Override
 170     public void postStop() {
 171         LOG.info("Stopping ShardManager");
 172
 173         mBean.unregisterMBean();
 174     }
 175
 176     @Override
 177     public void handleCommand(Object message) throws Exception {
 178         if (message  instanceof FindPrimary) {
 179             findPrimary((FindPrimary)message);
 180         } else if(message instanceof FindLocalShard){
 181             findLocalShard((FindLocalShard) message);
 182         } else if (message instanceof UpdateSchemaContext) {
 183             updateSchemaContext(message);
 184         } else if(message instanceof ActorInitialized) {
 185             onActorInitialized(message);
 186         } else if (message instanceof ClusterEvent.MemberUp){
 187             memberUp((ClusterEvent.MemberUp) message);
 188         } else if(message instanceof ClusterEvent.MemberRemoved) {
 189             memberRemoved((ClusterEvent.MemberRemoved) message);
 190         } else if(message instanceof ClusterEvent.UnreachableMember) {
 191             memberUnreachable((ClusterEvent.UnreachableMember)message);
 192         } else if(message instanceof ClusterEvent.ReachableMember) {
 193             memberReachable((ClusterEvent.ReachableMember) message);
 194         } else if(message instanceof DatastoreContext) {
 195             onDatastoreContext((DatastoreContext)message);
 196         } else if(message instanceof RoleChangeNotification) {
 197             onRoleChangeNotification((RoleChangeNotification) message);
 198         } else if(message instanceof FollowerInitialSyncUpStatus){
 199             onFollowerInitialSyncStatus((FollowerInitialSyncUpStatus) message);
 200         } else if(message instanceof ShardNotInitializedTimeout) {
 201             onShardNotInitializedTimeout((ShardNotInitializedTimeout)message);
 202         } else if(message instanceof ShardLeaderStateChanged) {
 203             onLeaderStateChanged((ShardLeaderStateChanged)message);
 204         } else {
 205             unknownMessage(message);
 206         }
 207
 208     }
 209
 210     private void checkReady(){
 211         if (isReadyWithLeaderId()) {
 212             LOG.info("{}: All Shards are ready - data store {} is ready, available count is {}",
 213                     persistenceId(), type, waitTillReadyCountdownLatch.getCount());
 214
 215             waitTillReadyCountdownLatch.countDown();
 216         }
 217     }
 218
 219     private void onLeaderStateChanged(ShardLeaderStateChanged leaderStateChanged) {
 220         LOG.info("{}: Received LeaderStateChanged message: {}", persistenceId(), leaderStateChanged);
 221
 222         ShardInformation shardInformation = findShardInformation(leaderStateChanged.getMemberId());
 223         if(shardInformation != null) {
 224             shardInformation.setLocalDataTree(leaderStateChanged.getLocalShardDataTree());
 225             if(shardInformation.setLeaderId(leaderStateChanged.getLeaderId())) {
 226                 primaryShardInfoCache.remove(shardInformation.getShardName());
 227             }
 228
 229             checkReady();
 230         } else {
 231             LOG.debug("No shard found with member Id {}", leaderStateChanged.getMemberId());
 232         }
 233     }
 234
 235     private void onShardNotInitializedTimeout(ShardNotInitializedTimeout message) {
 236         ShardInformation shardInfo = message.getShardInfo();
 237
 238         LOG.debug("{}: Received ShardNotInitializedTimeout message for shard {}", persistenceId(),
 239                 shardInfo.getShardName());
 240
 241         shardInfo.removeOnShardInitialized(message.getOnShardInitialized());
 242
 243         if(!shardInfo.isShardInitialized()) {
 244             LOG.debug("{}: Returning NotInitializedException for shard {}", persistenceId(), shardInfo.getShardName());
 245             message.getSender().tell(createNotInitializedException(shardInfo.shardId), getSelf());
 246         } else {
 247             LOG.debug("{}: Returning NoShardLeaderException for shard {}", persistenceId(), shardInfo.getShardName());
 248             message.getSender().tell(createNoShardLeaderException(shardInfo.shardId), getSelf());
 249         }
 250     }
 251
 252     private void onFollowerInitialSyncStatus(FollowerInitialSyncUpStatus status) {
 253         LOG.info("{} Received follower initial sync status for {} status sync done {}", persistenceId(),
 254                 status.getName(), status.isInitialSyncDone());
 255
 256         ShardInformation shardInformation = findShardInformation(status.getName());
 257
 258         if(shardInformation != null) {
 259             shardInformation.setFollowerSyncStatus(status.isInitialSyncDone());
 260
 261             mBean.setSyncStatus(isInSync());
 262         }
 263
 264     }
 265
 266     private void onRoleChangeNotification(RoleChangeNotification roleChanged) {
 267         LOG.info("{}: Received role changed for {} from {} to {}", persistenceId(), roleChanged.getMemberId(),
 268                 roleChanged.getOldRole(), roleChanged.getNewRole());
 269
 270         ShardInformation shardInformation = findShardInformation(roleChanged.getMemberId());
 271         if(shardInformation != null) {
 272             shardInformation.setRole(roleChanged.getNewRole());
 273             checkReady();
 274             mBean.setSyncStatus(isInSync());
 275         }
 276     }
 277
 278
 279     private ShardInformation findShardInformation(String memberId) {
 280         for(ShardInformation info : localShards.values()){
 281             if(info.getShardId().toString().equals(memberId)){
 282                 return info;
 283             }
 284         }
 285
 286         return null;
 287     }
 288
 289     private boolean isReadyWithLeaderId() {
 290         boolean isReady = true;
 291         for (ShardInformation info : localShards.values()) {
 292             if(!info.isShardReadyWithLeaderId()){
 293                 isReady = false;
 294                 break;
 295             }
 296         }
 297         return isReady;
 298     }
 299
 300     private boolean isInSync(){
 301         for (ShardInformation info : localShards.values()) {
 302             if(!info.isInSync()){
 303                 return false;
 304             }
 305         }
 306         return true;
 307     }
 308
 309     private void onActorInitialized(Object message) {
 310         final ActorRef sender = getSender();
 311
 312         if (sender == null) {
 313             return; //why is a non-actor sending this message? Just ignore.
 314         }
 315
 316         String actorName = sender.path().name();
 317         //find shard name from actor name; actor name is stringified shardId
 318         ShardIdentifier shardId = ShardIdentifier.builder().fromShardIdString(actorName).build();
 319
 320         if (shardId.getShardName() == null) {
 321             return;
 322         }
 323
 324         markShardAsInitialized(shardId.getShardName());
 325     }
 326
 327     private void markShardAsInitialized(String shardName) {
 328         LOG.debug("{}: Initializing shard [{}]", persistenceId(), shardName);
 329
 330         ShardInformation shardInformation = localShards.get(shardName);
 331         if (shardInformation != null) {
 332             shardInformation.setActorInitialized();
 333
 334             shardInformation.getActor().tell(new RegisterRoleChangeListener(), self());
 335         }
 336     }
 337
 338     @Override
 339     protected void handleRecover(Object message) throws Exception {
 340         if(dataPersistenceProvider.isRecoveryApplicable()) {
 341             if (message instanceof SchemaContextModules) {
 342                 SchemaContextModules msg = (SchemaContextModules) message;
 343                 knownModules = ImmutableSet.copyOf(msg.getModules());
 344             } else if (message instanceof RecoveryFailure) {
 345                 RecoveryFailure failure = (RecoveryFailure) message;
 346                 LOG.error("Recovery failed", failure.cause());
 347             } else if (message instanceof RecoveryCompleted) {
 348                 LOG.info("Recovery complete : {}", persistenceId());
 349
 350                 // Delete all the messages from the akka journal except the last one
 351                 deleteMessages(lastSequenceNr() - 1);
 352             }
 353         } else {
 354             if (message instanceof RecoveryCompleted) {
 355                 LOG.info("Recovery complete : {}", persistenceId());
 356
 357                 // Delete all the messages from the akka journal
 358                 deleteMessages(lastSequenceNr());
 359             }
 360         }
 361     }
 362
 363     private void findLocalShard(FindLocalShard message) {
 364         final ShardInformation shardInformation = localShards.get(message.getShardName());
 365
 366         if(shardInformation == null){
 367             getSender().tell(new LocalShardNotFound(message.getShardName()), getSelf());
 368             return;
 369         }
 370
 371         sendResponse(shardInformation, message.isWaitUntilInitialized(), false, new Supplier<Object>() {
 372             @Override
 373             public Object get() {
 374                 return new LocalShardFound(shardInformation.getActor());
 375             }
 376         });
 377     }
 378
 379     private void sendResponse(ShardInformation shardInformation, boolean doWait,
 380             boolean wantShardReady, final Supplier<Object> messageSupplier) {
 381         if (!shardInformation.isShardInitialized() || (wantShardReady && !shardInformation.isShardReadyWithLeaderId())) {
 382             if(doWait) {
 383                 final ActorRef sender = getSender();
 384                 final ActorRef self = self();
 385
 386                 Runnable replyRunnable = new Runnable() {
 387                     @Override
 388                     public void run() {
 389                         sender.tell(messageSupplier.get(), self);
 390                     }
 391                 };
 392
 393                 OnShardInitialized onShardInitialized = wantShardReady ? new OnShardReady(replyRunnable) :
 394                     new OnShardInitialized(replyRunnable);
 395
 396                 shardInformation.addOnShardInitialized(onShardInitialized);
 397
 398                 LOG.debug("{}: Scheduling timer to wait for shard {}", persistenceId(), shardInformation.getShardName());
 399
 400                 Cancellable timeoutSchedule = getContext().system().scheduler().scheduleOnce(
 401                         datastoreContext.getShardInitializationTimeout().duration(), getSelf(),
 402                         new ShardNotInitializedTimeout(shardInformation, onShardInitialized, sender),
 403                         getContext().dispatcher(), getSelf());
 404
 405                 onShardInitialized.setTimeoutSchedule(timeoutSchedule);
 406
 407             } else if (!shardInformation.isShardInitialized()) {
 408                 LOG.debug("{}: Returning NotInitializedException for shard {}", persistenceId(),
 409                         shardInformation.getShardName());
 410                 getSender().tell(createNotInitializedException(shardInformation.shardId), getSelf());
 411             } else {
 412                 LOG.debug("{}: Returning NoShardLeaderException for shard {}", persistenceId(),
 413                         shardInformation.getShardName());
 414                 getSender().tell(createNoShardLeaderException(shardInformation.shardId), getSelf());
 415             }
 416
 417             return;
 418         }
 419
 420         getSender().tell(messageSupplier.get(), getSelf());
 421     }
 422
 423     private NoShardLeaderException createNoShardLeaderException(ShardIdentifier shardId) {
 424         return new NoShardLeaderException(String.format(
 425                 "Could not find a leader for shard %s. This typically happens when the system is coming up or " +
 426                 "recovering and a leader is being elected. Try again later.", shardId));
 427     }
 428
 429     private NotInitializedException createNotInitializedException(ShardIdentifier shardId) {
 430         return new NotInitializedException(String.format(
 431                 "Found primary shard %s but it's not initialized yet. Please try again later", shardId));
 432     }
 433
 434     private void memberRemoved(ClusterEvent.MemberRemoved message) {
 435         String memberName = message.member().roles().head();
 436
 437         LOG.debug("{}: Received MemberRemoved: memberName: {}, address: {}", persistenceId(), memberName,
 438                 message.member().address());
 439
 440         memberNameToAddress.remove(message.member().roles().head());
 441     }
 442
 443     private void memberUp(ClusterEvent.MemberUp message) {
 444         String memberName = message.member().roles().head();
 445
 446         LOG.debug("{}: Received MemberUp: memberName: {}, address: {}", persistenceId(), memberName,
 447                 message.member().address());
 448
 449         memberNameToAddress.put(memberName, message.member().address());
 450
 451         for(ShardInformation info : localShards.values()){
 452             String shardName = info.getShardName();
 453             info.updatePeerAddress(getShardIdentifier(memberName, shardName).toString(),
 454                 getShardActorPath(shardName, memberName), getSelf());
 455         }
 456
 457         checkReady();
 458     }
 459
 460     private void memberReachable(ClusterEvent.ReachableMember message) {
 461         String memberName = message.member().roles().head();
 462         LOG.debug("Received ReachableMember: memberName {}, address: {}", memberName, message.member().address());
 463
 464         markMemberAvailable(memberName);
 465     }
 466
 467     private void memberUnreachable(ClusterEvent.UnreachableMember message) {
 468         String memberName = message.member().roles().head();
 469         LOG.debug("Received UnreachableMember: memberName {}, address: {}", memberName, message.member().address());
 470
 471         markMemberUnavailable(memberName);
 472     }
 473
 474     private void markMemberUnavailable(final String memberName) {
 475         for(ShardInformation info : localShards.values()){
 476             String leaderId = info.getLeaderId();
 477             if(leaderId != null && leaderId.contains(memberName)) {
 478                 LOG.debug("Marking Leader {} as unavailable.", leaderId);
 479                 info.setLeaderAvailable(false);
 480             }
 481         }
 482     }
 483
 484     private void markMemberAvailable(final String memberName) {
 485         for(ShardInformation info : localShards.values()){
 486             String leaderId = info.getLeaderId();
 487             if(leaderId != null && leaderId.contains(memberName)) {
 488                 LOG.debug("Marking Leader {} as available.", leaderId);
 489                 info.setLeaderAvailable(true);
 490             }
 491         }
 492     }
 493
 494     private void onDatastoreContext(DatastoreContext context) {
 495         datastoreContext = context;
 496         for (ShardInformation info : localShards.values()) {
 497             if (info.getActor() != null) {
 498                 info.getActor().tell(datastoreContext, getSelf());
 499             }
 500         }
 501     }
 502
 503     /**
 504      * Notifies all the local shards of a change in the schema context
 505      *
 506      * @param message
 507      */
 508     private void updateSchemaContext(final Object message) {
 509         final SchemaContext schemaContext = ((UpdateSchemaContext) message).getSchemaContext();
 510
 511         Set<ModuleIdentifier> allModuleIdentifiers = schemaContext.getAllModuleIdentifiers();
 512         Set<String> newModules = new HashSet<>(128);
 513
 514         for(ModuleIdentifier moduleIdentifier : allModuleIdentifiers){
 515             String s = moduleIdentifier.getNamespace().toString();
 516             newModules.add(s);
 517         }
 518
 519         if(newModules.containsAll(knownModules)) {
 520
 521             LOG.debug("New SchemaContext has a super set of current knownModules - persisting info");
 522
 523             knownModules = ImmutableSet.copyOf(newModules);
 524
 525             dataPersistenceProvider.persist(new SchemaContextModules(newModules), new Procedure<SchemaContextModules>() {
 526
 527                 @Override
 528                 public void apply(SchemaContextModules param) throws Exception {
 529                     LOG.debug("Sending new SchemaContext to Shards");
 530                     for (ShardInformation info : localShards.values()) {
 531                         if (info.getActor() == null) {
 532                             info.setActor(newShardActor(schemaContext, info));
 533                         } else {
 534                             info.getActor().tell(message, getSelf());
 535                         }
 536                     }
 537                 }
 538
 539             });
 540         } else {
 541             LOG.debug("Rejecting schema context update - not a super set of previously known modules:\nUPDATE: {}\nKNOWN: {}",
 542                     newModules, knownModules);
 543         }
 544
 545     }
 546
 547     @VisibleForTesting
 548     protected ClusterWrapper getCluster() {
 549         return cluster;
 550     }
 551
 552     @VisibleForTesting
 553     protected ActorRef newShardActor(final SchemaContext schemaContext, ShardInformation info) {
 554         return getContext().actorOf(Shard.props(info.getShardId(),
 555                 info.getPeerAddresses(), datastoreContext, schemaContext)
 556                         .withDispatcher(shardDispatcherPath), info.getShardId().toString());
 557     }
 558
 559     private void findPrimary(FindPrimary message) {
 560         LOG.debug("{}: In findPrimary: {}", persistenceId(), message);
 561
 562         final String shardName = message.getShardName();
 563         final boolean canReturnLocalShardState = !(message instanceof RemoteFindPrimary);
 564
 565         // First see if the there is a local replica for the shard
 566         final ShardInformation info = localShards.get(shardName);
 567         if (info != null) {
 568             sendResponse(info, message.isWaitUntilReady(), true, new Supplier<Object>() {
 569                 @Override
 570                 public Object get() {
 571                     String primaryPath = info.getSerializedLeaderActor();
 572                     Object found = canReturnLocalShardState && info.isLeader() ?
 573                             new LocalPrimaryShardFound(primaryPath, info.getLocalShardDataTree().get()) :
 574                                 new RemotePrimaryShardFound(primaryPath);
 575
 576                     if(LOG.isDebugEnabled()) {
 577                         LOG.debug("{}: Found primary for {}: {}", persistenceId(), shardName, found);
 578                     }
 579
 580                     return found;
 581                 }
 582             });
 583
 584             return;
 585         }
 586
 587         for(Map.Entry<String, Address> entry: memberNameToAddress.entrySet()) {
 588             if(!cluster.getCurrentMemberName().equals(entry.getKey())) {
 589                 String path = getShardManagerActorPathBuilder(entry.getValue()).toString();
 590
 591                 LOG.debug("{}: findPrimary for {} forwarding to remote ShardManager {}", persistenceId(),
 592                         shardName, path);
 593
 594                 getContext().actorSelection(path).forward(new RemoteFindPrimary(shardName,
 595                         message.isWaitUntilReady()), getContext());
 596                 return;
 597             }
 598         }
 599
 600         LOG.debug("{}: No shard found for {}", persistenceId(), shardName);
 601
 602         getSender().tell(new PrimaryNotFoundException(
 603                 String.format("No primary shard found for %s.", shardName)), getSelf());
 604     }
 605
 606     private StringBuilder getShardManagerActorPathBuilder(Address address) {
 607         StringBuilder builder = new StringBuilder();
 608         builder.append(address.toString()).append("/user/").append(shardManagerIdentifierString);
 609         return builder;
 610     }
 611
 612     private String getShardActorPath(String shardName, String memberName) {
 613         Address address = memberNameToAddress.get(memberName);
 614         if(address != null) {
 615             StringBuilder builder = getShardManagerActorPathBuilder(address);
 616             builder.append("/")
 617                 .append(getShardIdentifier(memberName, shardName));
 618             return builder.toString();
 619         }
 620         return null;
 621     }
 622
 623     /**
 624      * Construct the name of the shard actor given the name of the member on
 625      * which the shard resides and the name of the shard
 626      *
 627      * @param memberName
 628      * @param shardName
 629      * @return
 630      */
 631     private ShardIdentifier getShardIdentifier(String memberName, String shardName){
 632         return ShardIdentifier.builder().memberName(memberName).shardName(shardName).type(type).build();
 633     }
 634
 635     /**
 636      * Create shards that are local to the member on which the ShardManager
 637      * runs
 638      *
 639      */
 640     private void createLocalShards() {
 641         String memberName = this.cluster.getCurrentMemberName();
 642         List<String> memberShardNames =
 643             this.configuration.getMemberShardNames(memberName);
 644
 645         List<String> localShardActorNames = new ArrayList<>();
 646         for(String shardName : memberShardNames){
 647             ShardIdentifier shardId = getShardIdentifier(memberName, shardName);
 648             Map<String, String> peerAddresses = getPeerAddresses(shardName);
 649             localShardActorNames.add(shardId.toString());
 650             localShards.put(shardName, new ShardInformation(shardName, shardId, peerAddresses));
 651         }
 652
 653         mBean = ShardManagerInfo.createShardManagerMBean("shard-manager-" + this.type,
 654                     datastoreContext.getDataStoreMXBeanType(), localShardActorNames);
 655     }
 656
 657     /**
 658      * Given the name of the shard find the addresses of all it's peers
 659      *
 660      * @param shardName
 661      * @return
 662      */
 663     private Map<String, String> getPeerAddresses(String shardName){
 664
 665         Map<String, String> peerAddresses = new HashMap<>();
 666
 667         List<String> members = this.configuration.getMembersFromShardName(shardName);
 668
 669         String currentMemberName = this.cluster.getCurrentMemberName();
 670
 671         for(String memberName : members){
 672             if(!currentMemberName.equals(memberName)){
 673                 ShardIdentifier shardId = getShardIdentifier(memberName, shardName);
 674                 String path = getShardActorPath(shardName, currentMemberName);
 675                 peerAddresses.put(shardId.toString(), path);
 676             }
 677         }
 678         return peerAddresses;
 679     }
 680
 681     @Override
 682     public SupervisorStrategy supervisorStrategy() {
 683
 684         return new OneForOneStrategy(10, Duration.create("1 minute"),
 685             new Function<Throwable, SupervisorStrategy.Directive>() {
 686                 @Override
 687                 public SupervisorStrategy.Directive apply(Throwable t) {
 688                     LOG.warn("Supervisor Strategy caught unexpected exception - resuming", t);
 689                     return SupervisorStrategy.resume();
 690                 }
 691             }
 692         );
 693
 694     }
 695
 696     @Override
 697     public String persistenceId() {
 698         return "shard-manager-" + type;
 699     }
 700
 701     @VisibleForTesting
 702     Collection<String> getKnownModules() {
 703         return knownModules;
 704     }
 705
 706     @VisibleForTesting
 707     DataPersistenceProvider getDataPersistenceProvider() {
 708         return dataPersistenceProvider;
 709     }
 710
 711     @VisibleForTesting
 712     ShardManagerInfoMBean getMBean(){
 713         return mBean;
 714     }
 715
 716     @VisibleForTesting
 717     protected static class ShardInformation {
 718         private final ShardIdentifier shardId;
 719         private final String shardName;
 720         private ActorRef actor;
 721         private ActorPath actorPath;
 722         private final Map<String, String> peerAddresses;
 723         private Optional<DataTree> localShardDataTree;
 724         private boolean leaderAvailable = false;
 725
 726         // flag that determines if the actor is ready for business
 727         private boolean actorInitialized = false;
 728
 729         private boolean followerSyncStatus = false;
 730
 731         private final Set<OnShardInitialized> onShardInitializedSet = Sets.newHashSet();
 732         private String role ;
 733         private String leaderId;
 734
 735         private ShardInformation(String shardName, ShardIdentifier shardId,
 736                 Map<String, String> peerAddresses) {
 737             this.shardName = shardName;
 738             this.shardId = shardId;
 739             this.peerAddresses = peerAddresses;
 740         }
 741
 742         String getShardName() {
 743             return shardName;
 744         }
 745
 746         ActorRef getActor(){
 747             return actor;
 748         }
 749
 750         ActorPath getActorPath() {
 751             return actorPath;
 752         }
 753
 754         void setActor(ActorRef actor) {
 755             this.actor = actor;
 756             this.actorPath = actor.path();
 757         }
 758
 759         ShardIdentifier getShardId() {
 760             return shardId;
 761         }
 762
 763         void setLocalDataTree(Optional<DataTree> localShardDataTree) {
 764             this.localShardDataTree = localShardDataTree;
 765         }
 766
 767         Optional<DataTree> getLocalShardDataTree() {
 768             return localShardDataTree;
 769         }
 770
 771         Map<String, String> getPeerAddresses() {
 772             return peerAddresses;
 773         }
 774
 775         void updatePeerAddress(String peerId, String peerAddress, ActorRef sender){
 776             LOG.info("updatePeerAddress for peer {} with address {}", peerId,
 777                 peerAddress);
 778             if(peerAddresses.containsKey(peerId)){
 779                 peerAddresses.put(peerId, peerAddress);
 780
 781                 if(actor != null) {
 782                     if(LOG.isDebugEnabled()) {
 783                         LOG.debug("Sending PeerAddressResolved for peer {} with address {} to {}",
 784                                 peerId, peerAddress, actor.path());
 785                     }
 786
 787                     actor.tell(new PeerAddressResolved(peerId.toString(), peerAddress), sender);
 788                 }
 789
 790                 notifyOnShardInitializedCallbacks();
 791             }
 792         }
 793
 794         boolean isShardReady() {
 795             return !RaftState.Candidate.name().equals(role) && !Strings.isNullOrEmpty(role);
 796         }
 797
 798         boolean isShardReadyWithLeaderId() {
 799             return leaderAvailable && isShardReady() && (isLeader() || peerAddresses.get(leaderId) != null);
 800         }
 801
 802         boolean isShardInitialized() {
 803             return getActor() != null && actorInitialized;
 804         }
 805
 806         boolean isLeader() {
 807             return Objects.equal(leaderId, shardId.toString());
 808         }
 809
 810         String getSerializedLeaderActor() {
 811             if(isLeader()) {
 812                 return Serialization.serializedActorPath(getActor());
 813             } else {
 814                 return peerAddresses.get(leaderId);
 815             }
 816         }
 817
 818         void setActorInitialized() {
 819             LOG.debug("Shard {} is initialized", shardId);
 820
 821             this.actorInitialized = true;
 822
 823             notifyOnShardInitializedCallbacks();
 824         }
 825
 826         private void notifyOnShardInitializedCallbacks() {
 827             if(onShardInitializedSet.isEmpty()) {
 828                 return;
 829             }
 830
 831             boolean ready = isShardReadyWithLeaderId();
 832
 833             if(LOG.isDebugEnabled()) {
 834                 LOG.debug("Shard {} is {} - notifying {} OnShardInitialized callbacks", shardId,
 835                         ready ? "ready" : "initialized", onShardInitializedSet.size());
 836             }
 837
 838             Iterator<OnShardInitialized> iter = onShardInitializedSet.iterator();
 839             while(iter.hasNext()) {
 840                 OnShardInitialized onShardInitialized = iter.next();
 841                 if(!(onShardInitialized instanceof OnShardReady) || ready) {
 842                     iter.remove();
 843                     onShardInitialized.getTimeoutSchedule().cancel();
 844                     onShardInitialized.getReplyRunnable().run();
 845                 }
 846             }
 847         }
 848
 849         void addOnShardInitialized(OnShardInitialized onShardInitialized) {
 850             onShardInitializedSet.add(onShardInitialized);
 851         }
 852
 853         void removeOnShardInitialized(OnShardInitialized onShardInitialized) {
 854             onShardInitializedSet.remove(onShardInitialized);
 855         }
 856
 857         void setRole(String newRole) {
 858             this.role = newRole;
 859
 860             notifyOnShardInitializedCallbacks();
 861         }
 862
 863         void setFollowerSyncStatus(boolean syncStatus){
 864             this.followerSyncStatus = syncStatus;
 865         }
 866
 867         boolean isInSync(){
 868             if(RaftState.Follower.name().equals(this.role)){
 869                 return followerSyncStatus;
 870             } else if(RaftState.Leader.name().equals(this.role)){
 871                 return true;
 872             }
 873
 874             return false;
 875         }
 876
 877         boolean setLeaderId(String leaderId) {
 878             boolean changed = !Objects.equal(this.leaderId, leaderId);
 879             this.leaderId = leaderId;
 880             if(leaderId != null) {
 881                 this.leaderAvailable = true;
 882             }
 883             notifyOnShardInitializedCallbacks();
 884
 885             return changed;
 886         }
 887
 888         public String getLeaderId() {
 889             return leaderId;
 890         }
 891
 892         public void setLeaderAvailable(boolean leaderAvailable) {
 893             this.leaderAvailable = leaderAvailable;
 894         }
 895     }
 896
 897     private static class ShardManagerCreator implements Creator<ShardManager> {
 898         private static final long serialVersionUID = 1L;
 899
 900         final ClusterWrapper cluster;
 901         final Configuration configuration;
 902         final DatastoreContext datastoreContext;
 903         private final CountDownLatch waitTillReadyCountdownLatch;
 904         private final PrimaryShardInfoFutureCache primaryShardInfoCache;
 905
 906         ShardManagerCreator(ClusterWrapper cluster, Configuration configuration, DatastoreContext datastoreContext,
 907                 CountDownLatch waitTillReadyCountdownLatch, PrimaryShardInfoFutureCache primaryShardInfoCache) {
 908             this.cluster = cluster;
 909             this.configuration = configuration;
 910             this.datastoreContext = datastoreContext;
 911             this.waitTillReadyCountdownLatch = waitTillReadyCountdownLatch;
 912             this.primaryShardInfoCache = primaryShardInfoCache;
 913         }
 914
 915         @Override
 916         public ShardManager create() throws Exception {
 917             return new ShardManager(cluster, configuration, datastoreContext, waitTillReadyCountdownLatch,
 918                     primaryShardInfoCache);
 919         }
 920     }
 921
 922     private static class OnShardInitialized {
 923         private final Runnable replyRunnable;
 924         private Cancellable timeoutSchedule;
 925
 926         OnShardInitialized(Runnable replyRunnable) {
 927             this.replyRunnable = replyRunnable;
 928         }
 929
 930         Runnable getReplyRunnable() {
 931             return replyRunnable;
 932         }
 933
 934         Cancellable getTimeoutSchedule() {
 935             return timeoutSchedule;
 936         }
 937
 938         void setTimeoutSchedule(Cancellable timeoutSchedule) {
 939             this.timeoutSchedule = timeoutSchedule;
 940         }
 941     }
 942
 943     private static class OnShardReady extends OnShardInitialized {
 944         OnShardReady(Runnable replyRunnable) {
 945             super(replyRunnable);
 946         }
 947     }
 948
 949     private static class ShardNotInitializedTimeout {
 950         private final ActorRef sender;
 951         private final ShardInformation shardInfo;
 952         private final OnShardInitialized onShardInitialized;
 953
 954         ShardNotInitializedTimeout(ShardInformation shardInfo, OnShardInitialized onShardInitialized, ActorRef sender) {
 955             this.sender = sender;
 956             this.shardInfo = shardInfo;
 957             this.onShardInitialized = onShardInitialized;
 958         }
 959
 960         ActorRef getSender() {
 961             return sender;
 962         }
 963
 964         ShardInformation getShardInfo() {
 965             return shardInfo;
 966         }
 967
 968         OnShardInitialized getOnShardInitialized() {
 969             return onShardInitialized;
 970         }
 971     }
 972
 973     static class SchemaContextModules implements Serializable {
 974         private static final long serialVersionUID = -8884620101025936590L;
 975
 976         private final Set<String> modules;
 977
 978         SchemaContextModules(Set<String> modules){
 979             this.modules = modules;
 980         }
 981
 982         public Set<String> getModules() {
 983             return modules;
 984         }
 985     }
 986 }
 987
 988
 989