opendaylight/md-sal/sal-distributed-datastore/src/test/java/org/opendaylight/controller/cluster/datastore/entityownership/DistributedEntityOwnershipIntegrationTest.java

   1 /*
   2  * Copyright (c) 2015 Brocade Communications 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 package org.opendaylight.controller.cluster.datastore.entityownership;
   9
  10 import static org.junit.Assert.assertEquals;
  11 import static org.junit.Assert.assertNull;
  12 import static org.junit.Assert.assertThat;
  13 import static org.junit.Assert.assertTrue;
  14 import static org.mockito.AdditionalMatchers.or;
  15 import static org.mockito.Mockito.atMost;
  16 import static org.mockito.Mockito.doNothing;
  17 import static org.mockito.Mockito.reset;
  18 import static org.mockito.Mockito.timeout;
  19 import static org.mockito.Mockito.verify;
  20 import static org.opendaylight.controller.cluster.datastore.MemberNode.verifyRaftState;
  21 import static org.opendaylight.controller.cluster.datastore.entityownership.AbstractEntityOwnershipTest.ownershipChange;
  22 import static org.opendaylight.controller.cluster.datastore.entityownership.DistributedEntityOwnershipService.ENTITY_OWNERSHIP_SHARD_NAME;
  23 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.CANDIDATE_NAME_NODE_ID;
  24 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.entityPath;
  25 import akka.actor.Status.Failure;
  26 import akka.actor.Status.Success;
  27 import akka.cluster.Cluster;
  28 import akka.testkit.JavaTestKit;
  29 import com.google.common.base.Function;
  30 import com.google.common.base.Optional;
  31 import com.google.common.base.Stopwatch;
  32 import com.google.common.collect.Iterables;
  33 import com.google.common.util.concurrent.Uninterruptibles;
  34 import java.util.ArrayList;
  35 import java.util.Arrays;
  36 import java.util.Collection;
  37 import java.util.List;
  38 import java.util.concurrent.TimeUnit;
  39 import org.junit.After;
  40 import org.junit.Before;
  41 import org.junit.Test;
  42 import org.mockito.ArgumentCaptor;
  43 import org.mockito.Mock;
  44 import org.mockito.Mockito;
  45 import org.mockito.MockitoAnnotations;
  46 import org.opendaylight.controller.cluster.datastore.DatastoreContext;
  47 import org.opendaylight.controller.cluster.datastore.DistributedDataStore;
  48 import org.opendaylight.controller.cluster.datastore.MemberNode;
  49 import org.opendaylight.controller.cluster.datastore.MemberNode.RaftStateVerifier;
  50 import org.opendaylight.controller.cluster.datastore.entityownership.selectionstrategy.EntityOwnerSelectionStrategyConfig;
  51 import org.opendaylight.controller.cluster.datastore.messages.AddShardReplica;
  52 import org.opendaylight.controller.cluster.raft.client.messages.OnDemandRaftState;
  53 import org.opendaylight.controller.cluster.raft.utils.InMemoryJournal;
  54 import org.opendaylight.controller.cluster.raft.utils.InMemorySnapshotStore;
  55 import org.opendaylight.controller.md.cluster.datastore.model.SchemaContextHelper;
  56 import org.opendaylight.controller.md.sal.common.api.clustering.CandidateAlreadyRegisteredException;
  57 import org.opendaylight.controller.md.sal.common.api.clustering.Entity;
  58 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipCandidateRegistration;
  59 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipChange;
  60 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipListener;
  61 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipService;
  62 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipState;
  63 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.md.sal.clustering.entity.owners.rev150804.entity.owners.entity.type.entity.Candidate;
  64 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  65 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
  66 import org.opendaylight.yangtools.yang.data.api.schema.MapNode;
  67 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  68 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  69
  70 /**
  71  * End-to-end integration tests for the entity ownership functionality.
  72  *
  73  * @author Thomas Pantelis
  74  */
  75 public class DistributedEntityOwnershipIntegrationTest {
  76     private static final String MODULE_SHARDS_CONFIG = "module-shards-default.conf";
  77     private static final String MODULE_SHARDS_MEMBER_1_CONFIG = "module-shards-default-member-1.conf";
  78     private static final String ENTITY_TYPE1 = "entityType1";
  79     private static final String ENTITY_TYPE2 = "entityType2";
  80     private static final Entity ENTITY1 = new Entity(ENTITY_TYPE1, "entity1");
  81     private static final Entity ENTITY1_2 = new Entity(ENTITY_TYPE2, "entity1");
  82     private static final Entity ENTITY2 = new Entity(ENTITY_TYPE1, "entity2");
  83     private static final Entity ENTITY3 = new Entity(ENTITY_TYPE1, "entity3");
  84     private static final Entity ENTITY4 = new Entity(ENTITY_TYPE1, "entity4");
  85     private static final SchemaContext SCHEMA_CONTEXT = SchemaContextHelper.entityOwners();
  86
  87     private final DatastoreContext.Builder leaderDatastoreContextBuilder =
  88             DatastoreContext.newBuilder().shardHeartbeatIntervalInMillis(100).shardElectionTimeoutFactor(5).
  89                     shardIsolatedLeaderCheckIntervalInMillis(1000000);
  90
  91     private final DatastoreContext.Builder followerDatastoreContextBuilder =
  92             DatastoreContext.newBuilder().shardHeartbeatIntervalInMillis(100).shardElectionTimeoutFactor(10000);
  93
  94     private final List<MemberNode> memberNodes = new ArrayList<>();
  95
  96     @Mock
  97     private EntityOwnershipListener leaderMockListener;
  98
  99     @Mock
 100     private EntityOwnershipListener leaderMockListener2;
 101
 102     @Mock
 103     private EntityOwnershipListener follower1MockListener;
 104
 105     @Mock
 106     private EntityOwnershipListener follower2MockListener;
 107
 108     @Before
 109     public void setUp() {
 110         MockitoAnnotations.initMocks(this);
 111         InMemoryJournal.clear();
 112         InMemorySnapshotStore.clear();
 113     }
 114
 115     @After
 116     public void tearDown() {
 117         for(MemberNode m: memberNodes) {
 118             m.cleanup();
 119         }
 120     }
 121
 122     private DistributedEntityOwnershipService newOwnershipService(DistributedDataStore datastore) {
 123         DistributedEntityOwnershipService service = new DistributedEntityOwnershipService(datastore,
 124                 EntityOwnerSelectionStrategyConfig.newBuilder().build());
 125         service.start();
 126         return service;
 127     }
 128
 129     @Test
 130     public void testFunctionalityWithThreeNodes() throws Exception {
 131         String name = "test";
 132         MemberNode leaderNode = MemberNode.builder(memberNodes).akkaConfig("Member1").testName(name ).
 133                 moduleShardsConfig(MODULE_SHARDS_CONFIG).schemaContext(SCHEMA_CONTEXT).createOperDatastore(false).
 134                 datastoreContextBuilder(leaderDatastoreContextBuilder).build();
 135
 136         MemberNode follower1Node = MemberNode.builder(memberNodes).akkaConfig("Member2").testName(name ).
 137                 moduleShardsConfig(MODULE_SHARDS_CONFIG).schemaContext(SCHEMA_CONTEXT).createOperDatastore(false).
 138                 datastoreContextBuilder(followerDatastoreContextBuilder).build();
 139
 140         MemberNode follower2Node = MemberNode.builder(memberNodes).akkaConfig("Member3").testName(name ).
 141                 moduleShardsConfig(MODULE_SHARDS_CONFIG).schemaContext(SCHEMA_CONTEXT).createOperDatastore(false).
 142                 datastoreContextBuilder(followerDatastoreContextBuilder).build();
 143
 144         DistributedDataStore leaderDistributedDataStore = leaderNode.configDataStore();
 145
 146         leaderDistributedDataStore.waitTillReady();
 147         follower1Node.configDataStore().waitTillReady();
 148         follower2Node.configDataStore().waitTillReady();
 149
 150         EntityOwnershipService leaderEntityOwnershipService = newOwnershipService(leaderDistributedDataStore);
 151         EntityOwnershipService follower1EntityOwnershipService = newOwnershipService(follower1Node.configDataStore());
 152         EntityOwnershipService follower2EntityOwnershipService = newOwnershipService(follower2Node.configDataStore());
 153
 154         leaderNode.kit().waitUntilLeader(leaderNode.configDataStore().getActorContext(), ENTITY_OWNERSHIP_SHARD_NAME);
 155
 156         leaderEntityOwnershipService.registerListener(ENTITY_TYPE1, leaderMockListener);
 157         leaderEntityOwnershipService.registerListener(ENTITY_TYPE2, leaderMockListener2);
 158         follower1EntityOwnershipService.registerListener(ENTITY_TYPE1, follower1MockListener);
 159
 160         // Register leader candidate for entity1 and verify it becomes owner
 161
 162         leaderEntityOwnershipService.registerCandidate(ENTITY1);
 163         verify(leaderMockListener, timeout(5000)).ownershipChanged(ownershipChange(ENTITY1, false, true, true));
 164         verify(follower1MockListener, timeout(5000)).ownershipChanged(ownershipChange(ENTITY1, false, false, true));
 165         reset(leaderMockListener, follower1MockListener);
 166
 167         verifyGetOwnershipState(leaderEntityOwnershipService, ENTITY1, true, true);
 168         verifyGetOwnershipState(follower1EntityOwnershipService, ENTITY1, false, true);
 169
 170         // Register leader candidate for entity1_2 (same id, different type) and verify it becomes owner
 171
 172         leaderEntityOwnershipService.registerCandidate(ENTITY1_2);
 173         verify(leaderMockListener2, timeout(5000)).ownershipChanged(ownershipChange(ENTITY1_2, false, true, true));
 174         verify(leaderMockListener, timeout(300).never()).ownershipChanged(ownershipChange(ENTITY1_2));
 175         reset(leaderMockListener2);
 176
 177         // Register follower1 candidate for entity1 and verify it gets added but doesn't become owner
 178
 179         follower1EntityOwnershipService.registerCandidate(ENTITY1);
 180         verifyCandidates(leaderDistributedDataStore, ENTITY1, "member-1", "member-2");
 181         verifyOwner(leaderDistributedDataStore, ENTITY1, "member-1");
 182         verify(leaderMockListener, timeout(300).never()).ownershipChanged(ownershipChange(ENTITY1));
 183         verify(follower1MockListener, timeout(300).never()).ownershipChanged(ownershipChange(ENTITY1));
 184
 185         // Register follower1 candidate for entity2 and verify it becomes owner
 186
 187         EntityOwnershipCandidateRegistration follower1Entity2Reg = follower1EntityOwnershipService.registerCandidate(ENTITY2);
 188         verify(follower1MockListener, timeout(5000)).ownershipChanged(ownershipChange(ENTITY2, false, true, true));
 189         verify(leaderMockListener, timeout(5000)).ownershipChanged(ownershipChange(ENTITY2, false, false, true));
 190         reset(leaderMockListener, follower1MockListener);
 191
 192         // Register follower2 candidate for entity2 and verify it gets added but doesn't become owner
 193
 194         follower2EntityOwnershipService.registerListener(ENTITY_TYPE1, follower2MockListener);
 195         follower2EntityOwnershipService.registerCandidate(ENTITY2);
 196         verifyCandidates(leaderDistributedDataStore, ENTITY2, "member-2", "member-3");
 197         verifyOwner(leaderDistributedDataStore, ENTITY2, "member-2");
 198
 199         // Unregister follower1 candidate for entity2 and verify follower2 becomes owner
 200
 201         follower1Entity2Reg.close();
 202         verifyCandidates(leaderDistributedDataStore, ENTITY2, "member-3");
 203         verifyOwner(leaderDistributedDataStore, ENTITY2, "member-3");
 204         verify(follower1MockListener, timeout(5000)).ownershipChanged(ownershipChange(ENTITY2, true, false, true));
 205         verify(leaderMockListener, timeout(5000)).ownershipChanged(ownershipChange(ENTITY2, false, false, true));
 206
 207         // Depending on timing, follower2MockListener could get ownershipChanged with "false, false, true" if
 208         // if the original ownership change with "member-2 is replicated to follower2 after the listener is
 209         // registered.
 210         Uninterruptibles.sleepUninterruptibly(500, TimeUnit.MILLISECONDS);
 211         verify(follower2MockListener, atMost(1)).ownershipChanged(ownershipChange(ENTITY2, false, false, true));
 212         verify(follower2MockListener, timeout(5000)).ownershipChanged(ownershipChange(ENTITY2, false, true, true));
 213
 214         // Register follower1 candidate for entity3 and verify it becomes owner
 215
 216         follower1EntityOwnershipService.registerCandidate(ENTITY3);
 217         verifyOwner(leaderDistributedDataStore, ENTITY3, "member-2");
 218         verify(follower1MockListener, timeout(5000)).ownershipChanged(ownershipChange(ENTITY3, false, true, true));
 219         verify(follower2MockListener, timeout(5000)).ownershipChanged(ownershipChange(ENTITY3, false, false, true));
 220         verify(leaderMockListener, timeout(5000)).ownershipChanged(ownershipChange(ENTITY3, false, false, true));
 221
 222         // Register follower2 candidate for entity4 and verify it becomes owner
 223
 224         follower2EntityOwnershipService.registerCandidate(ENTITY4);
 225         verifyOwner(leaderDistributedDataStore, ENTITY4, "member-3");
 226         verify(follower2MockListener, timeout(5000)).ownershipChanged(ownershipChange(ENTITY4, false, true, true));
 227         verify(follower1MockListener, timeout(5000)).ownershipChanged(ownershipChange(ENTITY4, false, false, true));
 228         verify(leaderMockListener, timeout(5000)).ownershipChanged(ownershipChange(ENTITY4, false, false, true));
 229         reset(follower1MockListener, follower2MockListener);
 230
 231         // Register follower1 candidate for entity4 and verify it gets added but doesn't become owner
 232
 233         follower1EntityOwnershipService.registerCandidate(ENTITY4);
 234         verifyCandidates(leaderDistributedDataStore, ENTITY4, "member-3", "member-2");
 235         verifyOwner(leaderDistributedDataStore, ENTITY4, "member-3");
 236
 237         // Shutdown follower2 and verify it's owned entities (entity 2 & 4) get re-assigned
 238
 239         reset(leaderMockListener, follower1MockListener);
 240         follower2Node.cleanup();
 241
 242         verify(follower1MockListener, timeout(15000).times(2)).ownershipChanged(or(ownershipChange(ENTITY4, false, true, true),
 243                 ownershipChange(ENTITY2, false, false, false)));
 244         verify(leaderMockListener, timeout(15000).times(2)).ownershipChanged(or(ownershipChange(ENTITY4, false, false, true),
 245                 ownershipChange(ENTITY2, false, false, false)));
 246         verifyOwner(leaderDistributedDataStore, ENTITY2, ""); // no other candidate
 247
 248         // Register leader candidate for entity2 and verify it becomes owner
 249
 250         EntityOwnershipCandidateRegistration leaderEntity2Reg = leaderEntityOwnershipService.registerCandidate(ENTITY2);
 251         verify(leaderMockListener, timeout(5000)).ownershipChanged(ownershipChange(ENTITY2, false, true, true));
 252         verifyOwner(leaderDistributedDataStore, ENTITY2, "member-1");
 253
 254         // Unregister leader candidate for entity2 and verify the owner is cleared
 255
 256         leaderEntity2Reg.close();
 257         verifyOwner(leaderDistributedDataStore, ENTITY2, "");
 258         verify(leaderMockListener, timeout(5000)).ownershipChanged(ownershipChange(ENTITY2, true, false, false));
 259         verify(follower1MockListener, timeout(5000)).ownershipChanged(ownershipChange(ENTITY2, false, false, false));
 260     }
 261
 262     /**
 263      * Reproduces bug <a href="https://bugs.opendaylight.org/show_bug.cgi?id=4554">4554</a>
 264      *
 265      * @throws CandidateAlreadyRegisteredException
 266      */
 267     @Test
 268     public void testCloseCandidateRegistrationInQuickSuccession() throws CandidateAlreadyRegisteredException {
 269         String name = "testCloseCandidateRegistrationInQuickSuccession";
 270         MemberNode leaderNode = MemberNode.builder(memberNodes).akkaConfig("Member1").testName(name ).
 271                 moduleShardsConfig(MODULE_SHARDS_CONFIG).schemaContext(SCHEMA_CONTEXT).createOperDatastore(false).
 272                 datastoreContextBuilder(leaderDatastoreContextBuilder).build();
 273
 274         MemberNode follower1Node = MemberNode.builder(memberNodes).akkaConfig("Member2").testName(name ).
 275                 moduleShardsConfig(MODULE_SHARDS_CONFIG).schemaContext(SCHEMA_CONTEXT).createOperDatastore(false).
 276                 datastoreContextBuilder(followerDatastoreContextBuilder).build();
 277
 278         MemberNode follower2Node = MemberNode.builder(memberNodes).akkaConfig("Member3").testName(name ).
 279                 moduleShardsConfig(MODULE_SHARDS_CONFIG).schemaContext(SCHEMA_CONTEXT).createOperDatastore(false).
 280                 datastoreContextBuilder(followerDatastoreContextBuilder).build();
 281
 282         DistributedDataStore leaderDistributedDataStore = leaderNode.configDataStore();
 283
 284         leaderDistributedDataStore.waitTillReady();
 285         follower1Node.configDataStore().waitTillReady();
 286         follower2Node.configDataStore().waitTillReady();
 287
 288         EntityOwnershipService leaderEntityOwnershipService = newOwnershipService(leaderDistributedDataStore);
 289         EntityOwnershipService follower1EntityOwnershipService = newOwnershipService(follower1Node.configDataStore());
 290         EntityOwnershipService follower2EntityOwnershipService = newOwnershipService(follower2Node.configDataStore());
 291
 292         leaderNode.kit().waitUntilLeader(leaderNode.configDataStore().getActorContext(), ENTITY_OWNERSHIP_SHARD_NAME);
 293
 294         leaderEntityOwnershipService.registerListener(ENTITY_TYPE1, leaderMockListener);
 295         follower1EntityOwnershipService.registerListener(ENTITY_TYPE1, follower1MockListener);
 296         follower2EntityOwnershipService.registerListener(ENTITY_TYPE1, follower2MockListener);
 297
 298         final EntityOwnershipCandidateRegistration candidate1 = leaderEntityOwnershipService.registerCandidate(ENTITY1);
 299         final EntityOwnershipCandidateRegistration candidate2 = follower1EntityOwnershipService.registerCandidate(ENTITY1);
 300         final EntityOwnershipCandidateRegistration candidate3 = follower2EntityOwnershipService.registerCandidate(ENTITY1);
 301
 302         verify(leaderMockListener, timeout(5000)).ownershipChanged(ownershipChange(ENTITY1, false, true, true));
 303
 304         Mockito.reset(leaderMockListener);
 305
 306         candidate1.close();
 307         candidate2.close();
 308         candidate3.close();
 309
 310         ArgumentCaptor<EntityOwnershipChange> leaderChangeCaptor = ArgumentCaptor.forClass(EntityOwnershipChange.class);
 311         ArgumentCaptor<EntityOwnershipChange> follower1ChangeCaptor = ArgumentCaptor.forClass(EntityOwnershipChange.class);
 312         ArgumentCaptor<EntityOwnershipChange> follower2ChangeCaptor = ArgumentCaptor.forClass(EntityOwnershipChange.class);
 313         doNothing().when(leaderMockListener).ownershipChanged(leaderChangeCaptor.capture());
 314         doNothing().when(follower1MockListener).ownershipChanged(follower1ChangeCaptor.capture());
 315         doNothing().when(follower2MockListener).ownershipChanged(follower2ChangeCaptor.capture());
 316
 317         boolean passed = false;
 318         for(int i=0;i<100;i++) {
 319             Uninterruptibles.sleepUninterruptibly(50, TimeUnit.MILLISECONDS);
 320             if(!leaderEntityOwnershipService.getOwnershipState(ENTITY1).get().hasOwner() &&
 321                     !follower1EntityOwnershipService.getOwnershipState(ENTITY1).get().hasOwner() &&
 322                     !follower2EntityOwnershipService.getOwnershipState(ENTITY1).get().hasOwner() &&
 323                     leaderChangeCaptor.getAllValues().size() > 0 && !leaderChangeCaptor.getValue().hasOwner() &&
 324                     leaderChangeCaptor.getAllValues().size() > 0 && !follower1ChangeCaptor.getValue().hasOwner() &&
 325                     leaderChangeCaptor.getAllValues().size() > 0 && !follower2ChangeCaptor.getValue().hasOwner()) {
 326                 passed = true;
 327                 break;
 328             }
 329         }
 330
 331         assertTrue("No ownership change message was sent with hasOwner=false", passed);
 332     }
 333
 334     /**
 335      * Tests bootstrapping the entity-ownership shard when there's no shards initially configured for local
 336      * member. The entity-ownership shard is initially created as inactive (ie remains a follower), requiring
 337      * an AddShardReplica request to join it to an existing leader.
 338      */
 339     @Test
 340     public void testEntityOwnershipShardBootstrapping() throws Throwable {
 341         String name = "testEntityOwnershipShardBootstrapping";
 342         String moduleShardsConfig = MODULE_SHARDS_MEMBER_1_CONFIG;
 343         MemberNode leaderNode = MemberNode.builder(memberNodes).akkaConfig("Member1").testName(name ).
 344                 moduleShardsConfig(moduleShardsConfig).schemaContext(SCHEMA_CONTEXT).createOperDatastore(false).
 345                 datastoreContextBuilder(leaderDatastoreContextBuilder).build();
 346
 347         DistributedDataStore leaderDistributedDataStore = leaderNode.configDataStore();
 348         EntityOwnershipService leaderEntityOwnershipService = newOwnershipService(leaderDistributedDataStore);
 349
 350         leaderNode.kit().waitUntilLeader(leaderNode.configDataStore().getActorContext(), ENTITY_OWNERSHIP_SHARD_NAME);
 351
 352         MemberNode follower1Node = MemberNode.builder(memberNodes).akkaConfig("Member2").testName(name ).
 353                 moduleShardsConfig(moduleShardsConfig).schemaContext(SCHEMA_CONTEXT).createOperDatastore(false).
 354                 datastoreContextBuilder(followerDatastoreContextBuilder).build();
 355
 356         DistributedDataStore follower1DistributedDataStore = follower1Node.configDataStore();
 357         follower1DistributedDataStore.waitTillReady();
 358
 359         leaderNode.waitForMembersUp("member-2");
 360         follower1Node.waitForMembersUp("member-1");
 361
 362         EntityOwnershipService follower1EntityOwnershipService = newOwnershipService(follower1DistributedDataStore);
 363
 364         leaderEntityOwnershipService.registerListener(ENTITY_TYPE1, leaderMockListener);
 365
 366         // Register a candidate for follower1 - should get queued since follower1 has no leader
 367         EntityOwnershipCandidateRegistration candidateReg = follower1EntityOwnershipService.registerCandidate(ENTITY1);
 368         verify(leaderMockListener, timeout(300).never()).ownershipChanged(ownershipChange(ENTITY1));
 369
 370         // Add replica in follower1
 371         AddShardReplica addReplica = new AddShardReplica(ENTITY_OWNERSHIP_SHARD_NAME);
 372         follower1DistributedDataStore.getActorContext().getShardManager().tell(addReplica , follower1Node.kit().getRef());
 373         Object reply = follower1Node.kit().expectMsgAnyClassOf(JavaTestKit.duration("5 sec"), Success.class, Failure.class);
 374         if(reply instanceof Failure) {
 375             throw new AssertionError("AddShardReplica failed", ((Failure)reply).cause());
 376         }
 377
 378         // The queued candidate registration should proceed
 379         verify(leaderMockListener, timeout(5000)).ownershipChanged(ownershipChange(ENTITY1, false, false, true));
 380         reset(leaderMockListener);
 381
 382         candidateReg.close();
 383         verify(leaderMockListener, timeout(5000)).ownershipChanged(ownershipChange(ENTITY1, false, false, false));
 384         reset(leaderMockListener);
 385
 386         // Restart follower1 and verify the entity ownership shard is re-instated by registering.
 387         Cluster.get(leaderNode.kit().getSystem()).down(Cluster.get(follower1Node.kit().getSystem()).selfAddress());
 388         follower1Node.cleanup();
 389
 390         follower1Node = MemberNode.builder(memberNodes).akkaConfig("Member2").testName(name ).
 391                 moduleShardsConfig(moduleShardsConfig).schemaContext(SCHEMA_CONTEXT).createOperDatastore(false).
 392                 datastoreContextBuilder(followerDatastoreContextBuilder).build();
 393         follower1EntityOwnershipService = newOwnershipService(follower1Node.configDataStore());
 394
 395         follower1EntityOwnershipService.registerCandidate(ENTITY1);
 396         verify(leaderMockListener, timeout(20000)).ownershipChanged(ownershipChange(ENTITY1, false, false, true));
 397
 398         verifyRaftState(follower1Node.configDataStore(), ENTITY_OWNERSHIP_SHARD_NAME, new RaftStateVerifier() {
 399             @Override
 400             public void verify(OnDemandRaftState raftState) {
 401                 assertNull("Custom RaftPolicy class name", raftState.getCustomRaftPolicyClassName());
 402                 assertEquals("Peer count", 1, raftState.getPeerAddresses().keySet().size());
 403                 assertThat("Peer Id", Iterables.<String>getLast(raftState.getPeerAddresses().keySet()),
 404                         org.hamcrest.CoreMatchers.containsString("member-1"));
 405             }
 406         });
 407     }
 408
 409     private static void verifyGetOwnershipState(EntityOwnershipService service, Entity entity,
 410             boolean isOwner, boolean hasOwner) {
 411         Optional<EntityOwnershipState> state = service.getOwnershipState(entity);
 412         assertEquals("getOwnershipState present", true, state.isPresent());
 413         assertEquals("isOwner", isOwner, state.get().isOwner());
 414         assertEquals("hasOwner", hasOwner, state.get().hasOwner());
 415     }
 416
 417     private static void verifyCandidates(DistributedDataStore dataStore, Entity entity, String... expCandidates) throws Exception {
 418         AssertionError lastError = null;
 419         Stopwatch sw = Stopwatch.createStarted();
 420         while(sw.elapsed(TimeUnit.MILLISECONDS) <= 5000) {
 421             Optional<NormalizedNode<?, ?>> possible = dataStore.newReadOnlyTransaction().read(
 422                     entityPath(entity.getType(), entity.getId()).node(Candidate.QNAME)).get(5, TimeUnit.SECONDS);
 423             try {
 424                 assertEquals("Candidates not found for " + entity, true, possible.isPresent());
 425                 Collection<String> actual = new ArrayList<>();
 426                 for(MapEntryNode candidate: ((MapNode)possible.get()).getValue()) {
 427                     actual.add(candidate.getChild(CANDIDATE_NAME_NODE_ID).get().getValue().toString());
 428                 }
 429
 430                 assertEquals("Candidates for " + entity, Arrays.asList(expCandidates), actual);
 431                 return;
 432             } catch (AssertionError e) {
 433                 lastError = e;
 434                 Uninterruptibles.sleepUninterruptibly(300, TimeUnit.MILLISECONDS);
 435             }
 436         }
 437
 438         throw lastError;
 439     }
 440
 441     private static void verifyOwner(final DistributedDataStore dataStore, Entity entity, String expOwner) {
 442         AbstractEntityOwnershipTest.verifyOwner(expOwner, entity.getType(), entity.getId(),
 443                 new Function<YangInstanceIdentifier, NormalizedNode<?,?>>() {
 444                     @Override
 445                     public NormalizedNode<?, ?> apply(YangInstanceIdentifier path) {
 446                         try {
 447                             return dataStore.newReadOnlyTransaction().read(path).get(5, TimeUnit.SECONDS).get();
 448                         } catch (Exception e) {
 449                             return null;
 450                         }
 451                     }
 452                 });
 453     }
 454 }