+ // Send a tx with immediate commit.
+
+ DataTreeModification modification = dataTree.takeSnapshot().newModification();
+ new WriteModification(CarsModel.BASE_PATH, CarsModel.emptyContainer()).apply(modification);
+ new MergeModification(CarsModel.CAR_LIST_PATH, CarsModel.newCarMapNode()).apply(modification);
+
+ final MapEntryNode car1 = CarsModel.newCarEntry("optima", BigInteger.valueOf(20000));
+ new WriteModification(CarsModel.newCarPath("optima"), car1).apply(modification);
+
+ ForwardedReadyTransaction forwardedReady = new ForwardedReadyTransaction(tx1,
+ DataStoreVersions.CURRENT_VERSION, new ReadWriteShardDataTreeTransaction(
+ Mockito.mock(ShardDataTreeTransactionParent.class), tx1, modification), true);
+
+ carsFollowerShard.get().tell(forwardedReady, followerTestKit.getRef());
+ Object resp = followerTestKit.expectMsgClass(Object.class);
+ if (resp instanceof akka.actor.Status.Failure) {
+ throw new AssertionError("Unexpected failure response", ((akka.actor.Status.Failure)resp).cause());
+ }
+
+ assertEquals("Response type", CommitTransactionReply.class, resp.getClass());
+
+ verifyCars(leaderDistributedDataStore.newReadOnlyTransaction(), car1);
+
+ // Send another tx without immediate commit.
+
+ modification = dataTree.takeSnapshot().newModification();
+ MapEntryNode car2 = CarsModel.newCarEntry("sportage", BigInteger.valueOf(30000));
+ new WriteModification(CarsModel.newCarPath("sportage"), car2).apply(modification);
+
+ forwardedReady = new ForwardedReadyTransaction(tx2,
+ DataStoreVersions.CURRENT_VERSION, new ReadWriteShardDataTreeTransaction(
+ Mockito.mock(ShardDataTreeTransactionParent.class), tx2, modification), false);
+
+ carsFollowerShard.get().tell(forwardedReady, followerTestKit.getRef());
+ resp = followerTestKit.expectMsgClass(Object.class);
+ if (resp instanceof akka.actor.Status.Failure) {
+ throw new AssertionError("Unexpected failure response", ((akka.actor.Status.Failure)resp).cause());
+ }
+
+ assertEquals("Response type", ReadyTransactionReply.class, resp.getClass());
+
+ ActorSelection txActor = leaderDistributedDataStore.getActorContext().actorSelection(
+ ((ReadyTransactionReply)resp).getCohortPath());
+
+ final Supplier<Short> versionSupplier = Mockito.mock(Supplier.class);
+ Mockito.doReturn(DataStoreVersions.CURRENT_VERSION).when(versionSupplier).get();
+ final ThreePhaseCommitCohortProxy cohort = new ThreePhaseCommitCohortProxy(
+ leaderDistributedDataStore.getActorContext(), Arrays.asList(
+ new ThreePhaseCommitCohortProxy.CohortInfo(Futures.successful(txActor), versionSupplier)), tx2);
+ cohort.canCommit().get(5, TimeUnit.SECONDS);
+ cohort.preCommit().get(5, TimeUnit.SECONDS);
+ cohort.commit().get(5, TimeUnit.SECONDS);
+
+ verifyCars(leaderDistributedDataStore.newReadOnlyTransaction(), car1, car2);
+ }
+
+ @Test
+ public void testTransactionForwardedToLeaderAfterRetry() throws Exception {
+ //TODO remove when test passes also for ClientBackedDataStore
+ Assume.assumeTrue(testParameter.equals(DistributedDataStore.class));
+ followerDatastoreContextBuilder.shardBatchedModificationCount(2);
+ leaderDatastoreContextBuilder.shardBatchedModificationCount(2);
+ initDatastoresWithCarsAndPeople("testTransactionForwardedToLeaderAfterRetry");
+
+ // Do an initial write to get the primary shard info cached.
+
+ final DOMStoreWriteTransaction initialWriteTx = followerDistributedDataStore.newWriteOnlyTransaction();
+ initialWriteTx.write(CarsModel.BASE_PATH, CarsModel.emptyContainer());
+ initialWriteTx.write(PeopleModel.BASE_PATH, PeopleModel.emptyContainer());
+ followerTestKit.doCommit(initialWriteTx.ready());
+
+ // Wait for the commit to be replicated to the follower.
+
+ MemberNode.verifyRaftState(followerDistributedDataStore, "cars",
+ raftState -> assertEquals("getLastApplied", 0, raftState.getLastApplied()));
+
+ MemberNode.verifyRaftState(followerDistributedDataStore, "people",
+ raftState -> assertEquals("getLastApplied", 0, raftState.getLastApplied()));
+
+ // Prepare, ready and canCommit a WO tx that writes to 2 shards. This will become the current tx in
+ // the leader shard.
+
+ final DOMStoreWriteTransaction writeTx1 = followerDistributedDataStore.newWriteOnlyTransaction();
+ writeTx1.write(CarsModel.CAR_LIST_PATH, CarsModel.newCarMapNode());
+ writeTx1.write(PeopleModel.BASE_PATH, PeopleModel.emptyContainer());
+ final DOMStoreThreePhaseCommitCohort writeTx1Cohort = writeTx1.ready();
+ final ListenableFuture<Boolean> writeTx1CanCommit = writeTx1Cohort.canCommit();
+ writeTx1CanCommit.get(5, TimeUnit.SECONDS);
+
+ // Prepare and ready another WO tx that writes to 2 shards but don't canCommit yet. This will be queued
+ // in the leader shard.
+
+ final DOMStoreWriteTransaction writeTx2 = followerDistributedDataStore.newWriteOnlyTransaction();
+ final LinkedList<MapEntryNode> cars = new LinkedList<>();
+ int carIndex = 1;
+ cars.add(CarsModel.newCarEntry("car" + carIndex, BigInteger.valueOf(carIndex)));
+ writeTx2.write(CarsModel.newCarPath("car" + carIndex), cars.getLast());
+ carIndex++;
+ NormalizedNode<?, ?> people = PeopleModel.newPersonMapNode();
+ writeTx2.write(PeopleModel.PERSON_LIST_PATH, people);
+ final DOMStoreThreePhaseCommitCohort writeTx2Cohort = writeTx2.ready();
+
+ // Prepare another WO that writes to a single shard and thus will be directly committed on ready. This
+ // tx writes 5 cars so 2 BatchedModidifications messages will be sent initially and cached in the
+ // leader shard (with shardBatchedModificationCount set to 2). The 3rd BatchedModidifications will be
+ // sent on ready.
+
+ final DOMStoreWriteTransaction writeTx3 = followerDistributedDataStore.newWriteOnlyTransaction();
+ for (int i = 1; i <= 5; i++, carIndex++) {
+ cars.add(CarsModel.newCarEntry("car" + carIndex, BigInteger.valueOf(carIndex)));
+ writeTx3.write(CarsModel.newCarPath("car" + carIndex), cars.getLast());
+ }
+
+ // Prepare another WO that writes to a single shard. This will send a single BatchedModidifications
+ // message on ready.
+
+ final DOMStoreWriteTransaction writeTx4 = followerDistributedDataStore.newWriteOnlyTransaction();
+ cars.add(CarsModel.newCarEntry("car" + carIndex, BigInteger.valueOf(carIndex)));
+ writeTx4.write(CarsModel.newCarPath("car" + carIndex), cars.getLast());
+ carIndex++;
+
+ // Prepare a RW tx that will create a tx actor and send a ForwardedReadyTransaciton message to the
+ // leader shard on ready.
+
+ final DOMStoreReadWriteTransaction readWriteTx = followerDistributedDataStore.newReadWriteTransaction();
+ cars.add(CarsModel.newCarEntry("car" + carIndex, BigInteger.valueOf(carIndex)));
+ readWriteTx.write(CarsModel.newCarPath("car" + carIndex), cars.getLast());
+
+ IntegrationTestKit.verifyShardStats(leaderDistributedDataStore, "cars",
+ stats -> assertEquals("getReadWriteTransactionCount", 1, stats.getReadWriteTransactionCount()));
+
+ // Disable elections on the leader so it switches to follower.
+
+ sendDatastoreContextUpdate(leaderDistributedDataStore, leaderDatastoreContextBuilder
+ .customRaftPolicyImplementation(DisableElectionsRaftPolicy.class.getName())
+ .shardElectionTimeoutFactor(10));
+
+ Cluster.get(followerSystem).leave(MEMBER_1_ADDRESS);
+ leaderTestKit.waitUntilNoLeader(leaderDistributedDataStore.getActorContext(), "cars");
+
+ // Submit all tx's - the messages should get queued for retry.
+
+ final ListenableFuture<Boolean> writeTx2CanCommit = writeTx2Cohort.canCommit();
+ final DOMStoreThreePhaseCommitCohort writeTx3Cohort = writeTx3.ready();
+ final DOMStoreThreePhaseCommitCohort writeTx4Cohort = writeTx4.ready();
+ final DOMStoreThreePhaseCommitCohort rwTxCohort = readWriteTx.ready();
+
+ // Enable elections on the other follower so it becomes the leader, at which point the
+ // tx's should get forwarded from the previous leader to the new leader to complete the commits.
+
+ sendDatastoreContextUpdate(followerDistributedDataStore, followerDatastoreContextBuilder
+ .customRaftPolicyImplementation(null).shardElectionTimeoutFactor(1));
+
+ followerTestKit.doCommit(writeTx1CanCommit, writeTx1Cohort);
+ followerTestKit.doCommit(writeTx2CanCommit, writeTx2Cohort);
+ followerTestKit.doCommit(writeTx3Cohort);
+ followerTestKit.doCommit(writeTx4Cohort);
+ followerTestKit.doCommit(rwTxCohort);
+
+ DOMStoreReadTransaction readTx = leaderDistributedDataStore.newReadOnlyTransaction();
+ verifyCars(readTx, cars.toArray(new MapEntryNode[cars.size()]));
+ verifyNode(readTx, PeopleModel.PERSON_LIST_PATH, people);
+ }
+
+ @Test
+ public void testLeadershipTransferOnShutdown() throws Exception {
+ //TODO remove when test passes also for ClientBackedDataStore
+ Assume.assumeTrue(testParameter.equals(DistributedDataStore.class));
+ leaderDatastoreContextBuilder.shardBatchedModificationCount(1);
+ followerDatastoreContextBuilder.shardElectionTimeoutFactor(10).customRaftPolicyImplementation(null);
+ final String testName = "testLeadershipTransferOnShutdown";
+ initDatastores(testName, MODULE_SHARDS_CARS_PEOPLE_1_2_3, CARS_AND_PEOPLE);
+
+ final IntegrationTestKit follower2TestKit = new IntegrationTestKit(follower2System,
+ DatastoreContext.newBuilderFrom(followerDatastoreContextBuilder.build()).operationTimeoutInMillis(100),
+ commitTimeout);
+ try (AbstractDataStore follower2DistributedDataStore = follower2TestKit.setupAbstractDataStore(
+ testParameter, testName, MODULE_SHARDS_CARS_PEOPLE_1_2_3, false)) {
+
+ followerTestKit.waitForMembersUp("member-3");
+ follower2TestKit.waitForMembersUp("member-1", "member-2");
+
+ // Create and submit a couple tx's so they're pending.
+
+ DOMStoreWriteTransaction writeTx = followerDistributedDataStore.newWriteOnlyTransaction();
+ writeTx.write(CarsModel.BASE_PATH, CarsModel.emptyContainer());
+ writeTx.write(CarsModel.CAR_LIST_PATH, CarsModel.newCarMapNode());
+ writeTx.write(PeopleModel.BASE_PATH, PeopleModel.emptyContainer());
+ final DOMStoreThreePhaseCommitCohort cohort1 = writeTx.ready();
+
+ IntegrationTestKit.verifyShardStats(leaderDistributedDataStore, "cars",
+ stats -> assertEquals("getTxCohortCacheSize", 1, stats.getTxCohortCacheSize()));
+
+ writeTx = followerDistributedDataStore.newWriteOnlyTransaction();
+ final MapEntryNode car = CarsModel.newCarEntry("optima", BigInteger.valueOf(20000));
+ writeTx.write(CarsModel.newCarPath("optima"), car);
+ final DOMStoreThreePhaseCommitCohort cohort2 = writeTx.ready();
+
+ IntegrationTestKit.verifyShardStats(leaderDistributedDataStore, "cars",
+ stats -> assertEquals("getTxCohortCacheSize", 2, stats.getTxCohortCacheSize()));
+
+ // Gracefully stop the leader via a Shutdown message.
+
+ sendDatastoreContextUpdate(leaderDistributedDataStore, leaderDatastoreContextBuilder
+ .shardElectionTimeoutFactor(100));
+
+ final FiniteDuration duration = FiniteDuration.create(5, TimeUnit.SECONDS);
+ final Future<ActorRef> future = leaderDistributedDataStore.getActorContext().findLocalShardAsync("cars");
+ final ActorRef leaderActor = Await.result(future, duration);
+
+ final Future<Boolean> stopFuture = Patterns.gracefulStop(leaderActor, duration, Shutdown.INSTANCE);
+
+ // Commit the 2 transactions. They should finish and succeed.
+
+ followerTestKit.doCommit(cohort1);
+ followerTestKit.doCommit(cohort2);
+
+ // Wait for the leader actor stopped.
+
+ final Boolean stopped = Await.result(stopFuture, duration);
+ assertEquals("Stopped", Boolean.TRUE, stopped);
+
+ // Verify leadership was transferred by reading the committed data from the other nodes.
+
+ verifyCars(followerDistributedDataStore.newReadOnlyTransaction(), car);
+ verifyCars(follower2DistributedDataStore.newReadOnlyTransaction(), car);
+ }
+ }
+
+ @Test
+ public void testTransactionWithIsolatedLeader() throws Exception {
+ //TODO remove when test passes also for ClientBackedDataStore
+ Assume.assumeTrue(testParameter.equals(DistributedDataStore.class));
+ // Set the isolated leader check interval high so we can control the switch to IsolatedLeader.
+ leaderDatastoreContextBuilder.shardIsolatedLeaderCheckIntervalInMillis(10000000);
+ final String testName = "testTransactionWithIsolatedLeader";
+ initDatastoresWithCars(testName);
+
+ // Tx that is submitted after the follower is stopped but before the leader transitions to IsolatedLeader.
+ final DOMStoreWriteTransaction preIsolatedLeaderWriteTx = leaderDistributedDataStore.newWriteOnlyTransaction();
+ preIsolatedLeaderWriteTx.write(CarsModel.BASE_PATH, CarsModel.emptyContainer());
+
+ // Tx that is submitted after the leader transitions to IsolatedLeader.
+ final DOMStoreWriteTransaction noShardLeaderWriteTx = leaderDistributedDataStore.newWriteOnlyTransaction();
+ noShardLeaderWriteTx.write(CarsModel.BASE_PATH, CarsModel.emptyContainer());
+
+ // Tx that is submitted after the follower is reinstated.
+ final DOMStoreWriteTransaction successWriteTx = leaderDistributedDataStore.newWriteOnlyTransaction();
+ successWriteTx.merge(CarsModel.BASE_PATH, CarsModel.emptyContainer());
+
+ // Stop the follower
+ followerTestKit.watch(followerDistributedDataStore.getActorContext().getShardManager());
+ followerDistributedDataStore.close();
+ followerTestKit.expectTerminated(followerDistributedDataStore.getActorContext().getShardManager());
+
+ // Submit the preIsolatedLeaderWriteTx so it's pending
+ final DOMStoreThreePhaseCommitCohort preIsolatedLeaderTxCohort = preIsolatedLeaderWriteTx.ready();
+
+ // Change the isolated leader check interval low so it changes to IsolatedLeader.
+ sendDatastoreContextUpdate(leaderDistributedDataStore, leaderDatastoreContextBuilder
+ .shardIsolatedLeaderCheckIntervalInMillis(200));
+
+ MemberNode.verifyRaftState(leaderDistributedDataStore, "cars",
+ raftState -> assertEquals("getRaftState", "IsolatedLeader", raftState.getRaftState()));