X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?a=blobdiff_plain;f=opendaylight%2Fmd-sal%2Fsal-distributed-datastore%2Fsrc%2Ftest%2Fjava%2Forg%2Fopendaylight%2Fcontroller%2Fcluster%2Fdatastore%2Fentityownership%2FDistributedEntityOwnershipIntegrationTest.java;h=ad80b86e02ac5186baa8c472c75063c204223a4c;hb=c4b4b98f56ab1d9821edb737912632c2867ae783;hp=7240b3eebb686a841d60a42f79b7517461c007ff;hpb=1a6462c3cdb2cd310ab9503beb18da70f6e3779d;p=controller.git diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/test/java/org/opendaylight/controller/cluster/datastore/entityownership/DistributedEntityOwnershipIntegrationTest.java b/opendaylight/md-sal/sal-distributed-datastore/src/test/java/org/opendaylight/controller/cluster/datastore/entityownership/DistributedEntityOwnershipIntegrationTest.java index 7240b3eebb..ad80b86e02 100644 --- a/opendaylight/md-sal/sal-distributed-datastore/src/test/java/org/opendaylight/controller/cluster/datastore/entityownership/DistributedEntityOwnershipIntegrationTest.java +++ b/opendaylight/md-sal/sal-distributed-datastore/src/test/java/org/opendaylight/controller/cluster/datastore/entityownership/DistributedEntityOwnershipIntegrationTest.java @@ -27,9 +27,10 @@ import akka.actor.ActorRef; import akka.actor.Status.Failure; import akka.actor.Status.Success; import akka.cluster.Cluster; -import akka.testkit.JavaTestKit; -import com.google.common.base.Optional; +import akka.pattern.Patterns; +import akka.util.Timeout; import com.google.common.base.Stopwatch; +import com.google.common.collect.ImmutableMap; import com.google.common.collect.Iterables; import com.google.common.collect.Lists; import com.google.common.util.concurrent.Uninterruptibles; @@ -37,6 +38,7 @@ import java.util.ArrayList; import java.util.Arrays; import java.util.Collection; import java.util.List; +import java.util.Optional; import java.util.concurrent.TimeUnit; import org.junit.After; import org.junit.Before; @@ -52,7 +54,7 @@ import org.opendaylight.controller.cluster.datastore.IntegrationTestKit; import org.opendaylight.controller.cluster.datastore.MemberNode; import org.opendaylight.controller.cluster.datastore.entityownership.selectionstrategy.EntityOwnerSelectionStrategyConfig; import org.opendaylight.controller.cluster.datastore.messages.AddShardReplica; -import org.opendaylight.controller.cluster.raft.RaftState; +import org.opendaylight.controller.cluster.datastore.messages.ChangeShardMembersVotingStatus; import org.opendaylight.controller.cluster.raft.policy.DisableElectionsRaftPolicy; import org.opendaylight.controller.cluster.raft.utils.InMemoryJournal; import org.opendaylight.controller.cluster.raft.utils.InMemorySnapshotStore; @@ -68,6 +70,9 @@ 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.model.api.SchemaContext; +import scala.concurrent.Await; +import scala.concurrent.Future; +import scala.concurrent.duration.FiniteDuration; /** * End-to-end integration tests for the entity ownership functionality. @@ -124,13 +129,13 @@ public class DistributedEntityOwnershipIntegrationTest { } private static DistributedEntityOwnershipService newOwnershipService(final AbstractDataStore datastore) { - return DistributedEntityOwnershipService.start(datastore.getActorContext(), + return DistributedEntityOwnershipService.start(datastore.getActorUtils(), EntityOwnerSelectionStrategyConfig.newBuilder().build()); } @Test public void testFunctionalityWithThreeNodes() throws Exception { - String name = "test"; + String name = "testFunctionalityWithThreeNodes"; MemberNode leaderNode = MemberNode.builder(memberNodes).akkaConfig("Member1").testName(name) .moduleShardsConfig(MODULE_SHARDS_CONFIG).schemaContext(SCHEMA_CONTEXT).createOperDatastore(false) .datastoreContextBuilder(leaderDatastoreContextBuilder).build(); @@ -155,7 +160,7 @@ public class DistributedEntityOwnershipIntegrationTest { final DOMEntityOwnershipService follower2EntityOwnershipService = newOwnershipService(follower2Node.configDataStore()); - leaderNode.kit().waitUntilLeader(leaderNode.configDataStore().getActorContext(), ENTITY_OWNERSHIP_SHARD_NAME); + leaderNode.kit().waitUntilLeader(leaderNode.configDataStore().getActorUtils(), ENTITY_OWNERSHIP_SHARD_NAME); leaderEntityOwnershipService.registerListener(ENTITY_TYPE1, leaderMockListener); leaderEntityOwnershipService.registerListener(ENTITY_TYPE2, leaderMockListener2); @@ -273,7 +278,7 @@ public class DistributedEntityOwnershipIntegrationTest { followerDatastoreContextBuilder.shardElectionTimeoutFactor(5) .customRaftPolicyImplementation(DisableElectionsRaftPolicy.class.getName()); - String name = "test"; + String name = "testLeaderEntityOwnersReassignedAfterShutdown"; MemberNode leaderNode = MemberNode.builder(memberNodes).akkaConfig("Member1").testName(name) .moduleShardsConfig(MODULE_SHARDS_CONFIG).schemaContext(SCHEMA_CONTEXT).createOperDatastore(false) .datastoreContextBuilder(leaderDatastoreContextBuilder).build(); @@ -292,13 +297,15 @@ public class DistributedEntityOwnershipIntegrationTest { follower1Node.configDataStore().waitTillReady(); follower2Node.configDataStore().waitTillReady(); + follower1Node.waitForMembersUp("member-1", "member-3"); + final DOMEntityOwnershipService leaderEntityOwnershipService = newOwnershipService(leaderDistributedDataStore); final DOMEntityOwnershipService follower1EntityOwnershipService = newOwnershipService(follower1Node.configDataStore()); final DOMEntityOwnershipService follower2EntityOwnershipService = newOwnershipService(follower2Node.configDataStore()); - leaderNode.kit().waitUntilLeader(leaderNode.configDataStore().getActorContext(), ENTITY_OWNERSHIP_SHARD_NAME); + leaderNode.kit().waitUntilLeader(leaderNode.configDataStore().getActorUtils(), ENTITY_OWNERSHIP_SHARD_NAME); // Register follower1 candidate for entity1 and verify it becomes owner @@ -322,20 +329,23 @@ public class DistributedEntityOwnershipIntegrationTest { verifyCandidates(leaderDistributedDataStore, ENTITY2, "member-1", "member-3"); verifyOwner(leaderDistributedDataStore, ENTITY2, "member-1"); - // Shutdown the leader and verify its removed from the candidate list - - leaderNode.cleanup(); - follower1Node.waitForMemberDown("member-1"); - - // Re-enable elections on follower1 so it becomes the leader + // Re-enable elections on all remaining followers so one becomes the new leader - ActorRef follower1Shard = IntegrationTestKit.findLocalShard(follower1Node.configDataStore().getActorContext(), + ActorRef follower1Shard = IntegrationTestKit.findLocalShard(follower1Node.configDataStore().getActorUtils(), ENTITY_OWNERSHIP_SHARD_NAME); follower1Shard.tell(DatastoreContext.newBuilderFrom(followerDatastoreContextBuilder.build()) .customRaftPolicyImplementation(null).build(), ActorRef.noSender()); - MemberNode.verifyRaftState(follower1Node.configDataStore(), ENTITY_OWNERSHIP_SHARD_NAME, - raftState -> assertEquals("Raft state", RaftState.Leader.toString(), raftState.getRaftState())); + ActorRef follower2Shard = IntegrationTestKit.findLocalShard(follower2Node.configDataStore().getActorUtils(), + ENTITY_OWNERSHIP_SHARD_NAME); + follower2Shard.tell(DatastoreContext.newBuilderFrom(followerDatastoreContextBuilder.build()) + .customRaftPolicyImplementation(null).build(), ActorRef.noSender()); + + // Shutdown the leader and verify its removed from the candidate list + + leaderNode.cleanup(); + follower1Node.waitForMemberDown("member-1"); + follower2Node.waitForMemberDown("member-1"); // Verify the prior leader's entity owners are re-assigned. @@ -350,7 +360,7 @@ public class DistributedEntityOwnershipIntegrationTest { followerDatastoreContextBuilder.shardElectionTimeoutFactor(5) .customRaftPolicyImplementation(DisableElectionsRaftPolicy.class.getName()); - String name = "test"; + String name = "testLeaderAndFollowerEntityOwnersReassignedAfterShutdown"; final MemberNode leaderNode = MemberNode.builder(memberNodes).akkaConfig("Member1") .useAkkaArtery(false).testName(name) .moduleShardsConfig(MODULE_SHARDS_5_NODE_CONFIG).schemaContext(SCHEMA_CONTEXT) @@ -381,6 +391,11 @@ public class DistributedEntityOwnershipIntegrationTest { leaderDistributedDataStore.waitTillReady(); follower1Node.configDataStore().waitTillReady(); follower2Node.configDataStore().waitTillReady(); + follower3Node.configDataStore().waitTillReady(); + follower4Node.configDataStore().waitTillReady(); + + leaderNode.waitForMembersUp("member-2", "member-3", "member-4", "member-5"); + follower1Node.waitForMembersUp("member-1", "member-3", "member-4", "member-5"); final DOMEntityOwnershipService leaderEntityOwnershipService = newOwnershipService(leaderDistributedDataStore); final DOMEntityOwnershipService follower1EntityOwnershipService = @@ -391,7 +406,7 @@ public class DistributedEntityOwnershipIntegrationTest { newOwnershipService(follower3Node.configDataStore()); newOwnershipService(follower4Node.configDataStore()); - leaderNode.kit().waitUntilLeader(leaderNode.configDataStore().getActorContext(), ENTITY_OWNERSHIP_SHARD_NAME); + leaderNode.kit().waitUntilLeader(leaderNode.configDataStore().getActorUtils(), ENTITY_OWNERSHIP_SHARD_NAME); // Register follower1 candidate for entity1 and verify it becomes owner @@ -421,6 +436,23 @@ public class DistributedEntityOwnershipIntegrationTest { verifyCandidates(leaderDistributedDataStore, ENTITY2, "member-1", "member-3", "member-4"); verifyOwner(leaderDistributedDataStore, ENTITY2, "member-1"); + // Re-enable elections on all remaining followers so one becomes the new leader + + ActorRef follower1Shard = IntegrationTestKit.findLocalShard(follower1Node.configDataStore().getActorUtils(), + ENTITY_OWNERSHIP_SHARD_NAME); + follower1Shard.tell(DatastoreContext.newBuilderFrom(followerDatastoreContextBuilder.build()) + .customRaftPolicyImplementation(null).build(), ActorRef.noSender()); + + ActorRef follower2Shard = IntegrationTestKit.findLocalShard(follower2Node.configDataStore().getActorUtils(), + ENTITY_OWNERSHIP_SHARD_NAME); + follower2Shard.tell(DatastoreContext.newBuilderFrom(followerDatastoreContextBuilder.build()) + .customRaftPolicyImplementation(null).build(), ActorRef.noSender()); + + ActorRef follower4Shard = IntegrationTestKit.findLocalShard(follower4Node.configDataStore().getActorUtils(), + ENTITY_OWNERSHIP_SHARD_NAME); + follower4Shard.tell(DatastoreContext.newBuilderFrom(followerDatastoreContextBuilder.build()) + .customRaftPolicyImplementation(null).build(), ActorRef.noSender()); + // Shutdown the leader and follower3 leaderNode.cleanup(); @@ -428,16 +460,10 @@ public class DistributedEntityOwnershipIntegrationTest { follower1Node.waitForMemberDown("member-1"); follower1Node.waitForMemberDown("member-4"); - - // Re-enable elections on follower1 so it becomes the leader - - ActorRef follower1Shard = IntegrationTestKit.findLocalShard(follower1Node.configDataStore().getActorContext(), - ENTITY_OWNERSHIP_SHARD_NAME); - follower1Shard.tell(DatastoreContext.newBuilderFrom(followerDatastoreContextBuilder.build()) - .customRaftPolicyImplementation(null).build(), ActorRef.noSender()); - - MemberNode.verifyRaftState(follower1Node.configDataStore(), ENTITY_OWNERSHIP_SHARD_NAME, - raftState -> assertEquals("Raft state", RaftState.Leader.toString(), raftState.getRaftState())); + follower2Node.waitForMemberDown("member-1"); + follower2Node.waitForMemberDown("member-4"); + follower4Node.waitForMemberDown("member-1"); + follower4Node.waitForMemberDown("member-4"); // Verify the prior leader's and follower3 entity owners are re-assigned. @@ -477,7 +503,7 @@ public class DistributedEntityOwnershipIntegrationTest { final DOMEntityOwnershipService follower2EntityOwnershipService = newOwnershipService(follower2Node.configDataStore()); - leaderNode.kit().waitUntilLeader(leaderNode.configDataStore().getActorContext(), ENTITY_OWNERSHIP_SHARD_NAME); + leaderNode.kit().waitUntilLeader(leaderNode.configDataStore().getActorUtils(), ENTITY_OWNERSHIP_SHARD_NAME); leaderEntityOwnershipService.registerListener(ENTITY_TYPE1, leaderMockListener); follower1EntityOwnershipService.registerListener(ENTITY_TYPE1, follower1MockListener); @@ -538,10 +564,10 @@ public class DistributedEntityOwnershipIntegrationTest { private static Optional getValueSafely(ArgumentCaptor captor) { try { - return Optional.fromNullable(captor.getValue()); + return Optional.ofNullable(captor.getValue()); } catch (MockitoException e) { // No value was captured - return Optional.absent(); + return Optional.empty(); } } @@ -561,7 +587,7 @@ public class DistributedEntityOwnershipIntegrationTest { AbstractDataStore leaderDistributedDataStore = leaderNode.configDataStore(); final DOMEntityOwnershipService leaderEntityOwnershipService = newOwnershipService(leaderDistributedDataStore); - leaderNode.kit().waitUntilLeader(leaderNode.configDataStore().getActorContext(), ENTITY_OWNERSHIP_SHARD_NAME); + leaderNode.kit().waitUntilLeader(leaderNode.configDataStore().getActorUtils(), ENTITY_OWNERSHIP_SHARD_NAME); MemberNode follower1Node = MemberNode.builder(memberNodes).akkaConfig("Member2").testName(name) .moduleShardsConfig(moduleShardsConfig).schemaContext(SCHEMA_CONTEXT).createOperDatastore(false) @@ -585,9 +611,9 @@ public class DistributedEntityOwnershipIntegrationTest { // Add replica in follower1 AddShardReplica addReplica = new AddShardReplica(ENTITY_OWNERSHIP_SHARD_NAME); - follower1DistributedDataStore.getActorContext().getShardManager().tell(addReplica, + follower1DistributedDataStore.getActorUtils().getShardManager().tell(addReplica, follower1Node.kit().getRef()); - Object reply = follower1Node.kit().expectMsgAnyClassOf(JavaTestKit.duration("5 sec"), + Object reply = follower1Node.kit().expectMsgAnyClassOf(follower1Node.kit().duration("5 sec"), Success.class, Failure.class); if (reply instanceof Failure) { throw new AssertionError("AddShardReplica failed", ((Failure)reply).cause()); @@ -623,7 +649,7 @@ public class DistributedEntityOwnershipIntegrationTest { @Test public void testOwnerSelectedOnRapidUnregisteringAndRegisteringOfCandidates() throws Exception { - String name = "test"; + String name = "testOwnerSelectedOnRapidUnregisteringAndRegisteringOfCandidates"; MemberNode leaderNode = MemberNode.builder(memberNodes).akkaConfig("Member1").testName(name) .moduleShardsConfig(MODULE_SHARDS_CONFIG).schemaContext(SCHEMA_CONTEXT).createOperDatastore(false) .datastoreContextBuilder(leaderDatastoreContextBuilder).build(); @@ -647,7 +673,7 @@ public class DistributedEntityOwnershipIntegrationTest { newOwnershipService(follower1Node.configDataStore()); newOwnershipService(follower2Node.configDataStore()); - leaderNode.kit().waitUntilLeader(leaderNode.configDataStore().getActorContext(), ENTITY_OWNERSHIP_SHARD_NAME); + leaderNode.kit().waitUntilLeader(leaderNode.configDataStore().getActorUtils(), ENTITY_OWNERSHIP_SHARD_NAME); // Register leader candidate for entity1 and verify it becomes owner @@ -666,7 +692,7 @@ public class DistributedEntityOwnershipIntegrationTest { @Test public void testOwnerSelectedOnRapidRegisteringAndUnregisteringOfCandidates() throws Exception { - String name = "test"; + String name = "testOwnerSelectedOnRapidRegisteringAndUnregisteringOfCandidates"; MemberNode leaderNode = MemberNode.builder(memberNodes).akkaConfig("Member1").testName(name) .moduleShardsConfig(MODULE_SHARDS_CONFIG).schemaContext(SCHEMA_CONTEXT).createOperDatastore(false) .datastoreContextBuilder(leaderDatastoreContextBuilder).build(); @@ -690,7 +716,7 @@ public class DistributedEntityOwnershipIntegrationTest { newOwnershipService(follower1Node.configDataStore()); newOwnershipService(follower2Node.configDataStore()); - leaderNode.kit().waitUntilLeader(leaderNode.configDataStore().getActorContext(), ENTITY_OWNERSHIP_SHARD_NAME); + leaderNode.kit().waitUntilLeader(leaderNode.configDataStore().getActorUtils(), ENTITY_OWNERSHIP_SHARD_NAME); // Register leader candidate for entity1 and verify it becomes owner @@ -707,10 +733,113 @@ public class DistributedEntityOwnershipIntegrationTest { verifyOwner(leaderDistributedDataStore, ENTITY1, "member-2"); } + @Test + public void testEntityOwnershipWithNonVotingMembers() throws Exception { + followerDatastoreContextBuilder.shardElectionTimeoutFactor(5) + .customRaftPolicyImplementation(DisableElectionsRaftPolicy.class.getName()); + + String name = "testEntityOwnershipWithNonVotingMembers"; + final MemberNode member1LeaderNode = MemberNode.builder(memberNodes).akkaConfig("Member1") + .useAkkaArtery(false).testName(name) + .moduleShardsConfig(MODULE_SHARDS_5_NODE_CONFIG).schemaContext(SCHEMA_CONTEXT) + .createOperDatastore(false).datastoreContextBuilder(leaderDatastoreContextBuilder).build(); + + final MemberNode member2FollowerNode = MemberNode.builder(memberNodes).akkaConfig("Member2") + .useAkkaArtery(false).testName(name) + .moduleShardsConfig(MODULE_SHARDS_5_NODE_CONFIG).schemaContext(SCHEMA_CONTEXT) + .createOperDatastore(false).datastoreContextBuilder(followerDatastoreContextBuilder).build(); + + final MemberNode member3FollowerNode = MemberNode.builder(memberNodes).akkaConfig("Member3") + .useAkkaArtery(false).testName(name) + .moduleShardsConfig(MODULE_SHARDS_5_NODE_CONFIG).schemaContext(SCHEMA_CONTEXT) + .createOperDatastore(false).datastoreContextBuilder(followerDatastoreContextBuilder).build(); + + final MemberNode member4FollowerNode = MemberNode.builder(memberNodes).akkaConfig("Member4") + .useAkkaArtery(false).testName(name) + .moduleShardsConfig(MODULE_SHARDS_5_NODE_CONFIG).schemaContext(SCHEMA_CONTEXT) + .createOperDatastore(false).datastoreContextBuilder(followerDatastoreContextBuilder).build(); + + final MemberNode member5FollowerNode = MemberNode.builder(memberNodes).akkaConfig("Member5") + .useAkkaArtery(false).testName(name) + .moduleShardsConfig(MODULE_SHARDS_5_NODE_CONFIG).schemaContext(SCHEMA_CONTEXT) + .createOperDatastore(false).datastoreContextBuilder(followerDatastoreContextBuilder).build(); + + AbstractDataStore leaderDistributedDataStore = member1LeaderNode.configDataStore(); + + leaderDistributedDataStore.waitTillReady(); + member2FollowerNode.configDataStore().waitTillReady(); + member3FollowerNode.configDataStore().waitTillReady(); + member4FollowerNode.configDataStore().waitTillReady(); + member5FollowerNode.configDataStore().waitTillReady(); + + member1LeaderNode.waitForMembersUp("member-2", "member-3", "member-4", "member-5"); + + final DOMEntityOwnershipService member3EntityOwnershipService = + newOwnershipService(member3FollowerNode.configDataStore()); + final DOMEntityOwnershipService member4EntityOwnershipService = + newOwnershipService(member4FollowerNode.configDataStore()); + final DOMEntityOwnershipService member5EntityOwnershipService = + newOwnershipService(member5FollowerNode.configDataStore()); + + newOwnershipService(member1LeaderNode.configDataStore()); + member1LeaderNode.kit().waitUntilLeader(member1LeaderNode.configDataStore().getActorUtils(), + ENTITY_OWNERSHIP_SHARD_NAME); + + // Make member4 and member5 non-voting + + Future future = Patterns.ask(leaderDistributedDataStore.getActorUtils().getShardManager(), + new ChangeShardMembersVotingStatus(ENTITY_OWNERSHIP_SHARD_NAME, + ImmutableMap.of("member-4", Boolean.FALSE, "member-5", Boolean.FALSE)), + new Timeout(10, TimeUnit.SECONDS)); + Object response = Await.result(future, FiniteDuration.apply(10, TimeUnit.SECONDS)); + if (response instanceof Throwable) { + throw new AssertionError("ChangeShardMembersVotingStatus failed", (Throwable)response); + } + + assertNull("Expected null Success response. Actual " + response, response); + + // Register member4 candidate for entity1 - it should not become owner since it's non-voting + + member4EntityOwnershipService.registerCandidate(ENTITY1); + verifyCandidates(leaderDistributedDataStore, ENTITY1, "member-4"); + + // Register member5 candidate for entity2 - it should not become owner since it's non-voting + + member5EntityOwnershipService.registerCandidate(ENTITY2); + verifyCandidates(leaderDistributedDataStore, ENTITY2, "member-5"); + + Uninterruptibles.sleepUninterruptibly(500, TimeUnit.MILLISECONDS); + verifyOwner(leaderDistributedDataStore, ENTITY1, ""); + verifyOwner(leaderDistributedDataStore, ENTITY2, ""); + + // Register member3 candidate for entity1 - it should become owner since it's voting + + member3EntityOwnershipService.registerCandidate(ENTITY1); + verifyCandidates(leaderDistributedDataStore, ENTITY1, "member-4", "member-3"); + verifyOwner(leaderDistributedDataStore, ENTITY1, "member-3"); + + // Switch member4 and member5 back to voting and member3 non-voting. This should result in member4 and member5 + // to become entity owners. + + future = Patterns.ask(leaderDistributedDataStore.getActorUtils().getShardManager(), + new ChangeShardMembersVotingStatus(ENTITY_OWNERSHIP_SHARD_NAME, + ImmutableMap.of("member-3", Boolean.FALSE, "member-4", Boolean.TRUE, "member-5", Boolean.TRUE)), + new Timeout(10, TimeUnit.SECONDS)); + response = Await.result(future, FiniteDuration.apply(10, TimeUnit.SECONDS)); + if (response instanceof Throwable) { + throw new AssertionError("ChangeShardMembersVotingStatus failed", (Throwable)response); + } + + assertNull("Expected null Success response. Actual " + response, response); + + verifyOwner(leaderDistributedDataStore, ENTITY1, "member-4"); + verifyOwner(leaderDistributedDataStore, ENTITY2, "member-5"); + } + private static void verifyGetOwnershipState(final DOMEntityOwnershipService service, final DOMEntity entity, final EntityOwnershipState expState) { Optional state = service.getOwnershipState(entity); - assertEquals("getOwnershipState present", true, state.isPresent()); + assertTrue("getOwnershipState present", state.isPresent()); assertEquals("EntityOwnershipState", expState, state.get()); } @@ -723,7 +852,7 @@ public class DistributedEntityOwnershipIntegrationTest { .read(entityPath(entity.getType(), entity.getIdentifier()).node(Candidate.QNAME)) .get(5, TimeUnit.SECONDS); try { - assertEquals("Candidates not found for " + entity, true, possible.isPresent()); + assertTrue("Candidates not found for " + entity, possible.isPresent()); Collection actual = new ArrayList<>(); for (MapEntryNode candidate: ((MapNode)possible.get()).getValue()) { actual.add(candidate.getChild(CANDIDATE_NAME_NODE_ID).get().getValue().toString());