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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2018/09/28 09:40:19 UTC

[GitHub] asfgit closed pull request #6734: [FLINK-9455][RM] Add support for multi task slot TaskExecutors

asfgit closed pull request #6734: [FLINK-9455][RM] Add support for multi task slot TaskExecutors
URL: https://github.com/apache/flink/pull/6734
 
 
   

This is a PR merged from a forked repository.
As GitHub hides the original diff on merge, it is displayed below for
the sake of provenance:

As this is a foreign pull request (from a fork), the diff is supplied
below (as it won't show otherwise due to GitHub magic):

diff --git a/flink-mesos/src/main/java/org/apache/flink/mesos/runtime/clusterframework/MesosResourceManager.java b/flink-mesos/src/main/java/org/apache/flink/mesos/runtime/clusterframework/MesosResourceManager.java
index f18d0d8cfc7..d8267735209 100644
--- a/flink-mesos/src/main/java/org/apache/flink/mesos/runtime/clusterframework/MesosResourceManager.java
+++ b/flink-mesos/src/main/java/org/apache/flink/mesos/runtime/clusterframework/MesosResourceManager.java
@@ -24,7 +24,6 @@
 import org.apache.flink.mesos.runtime.clusterframework.store.MesosWorkerStore;
 import org.apache.flink.mesos.scheduler.ConnectionMonitor;
 import org.apache.flink.mesos.scheduler.LaunchCoordinator;
-import org.apache.flink.mesos.scheduler.LaunchableTask;
 import org.apache.flink.mesos.scheduler.ReconciliationCoordinator;
 import org.apache.flink.mesos.scheduler.TaskMonitor;
 import org.apache.flink.mesos.scheduler.TaskSchedulerBuilder;
@@ -79,6 +78,7 @@
 
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
@@ -124,6 +124,8 @@
 	@Nullable
 	private final String webUiUrl;
 
+	private final Collection<ResourceProfile> slotsPerWorker;
+
 	/** Mesos scheduler driver. */
 	private SchedulerDriver schedulerDriver;
 
@@ -191,6 +193,9 @@ public MesosResourceManager(
 		this.workersInNew = new HashMap<>(8);
 		this.workersInLaunch = new HashMap<>(8);
 		this.workersBeingReturned = new HashMap<>(8);
+
+		final ContaineredTaskManagerParameters containeredTaskManagerParameters = taskManagerParameters.containeredParameters();
+		this.slotsPerWorker = createSlotsPerWorker(containeredTaskManagerParameters.numSlots());
 	}
 
 	protected ActorRef createSelfActor() {
@@ -352,7 +357,7 @@ private void recoverWorkers(final List<MesosWorkerStore.Worker> tasksFromPreviou
 				switch(worker.state()) {
 					case Launched:
 						workersInLaunch.put(extractResourceID(worker.taskID()), worker);
-						final LaunchableMesosWorker launchable = createLaunchableMesosWorker(worker.taskID(), worker.profile());
+						final LaunchableMesosWorker launchable = createLaunchableMesosWorker(worker.taskID());
 						toAssign.add(new Tuple2<>(launchable.taskRequest(), worker.hostname().get()));
 						break;
 					case Released:
@@ -426,7 +431,7 @@ protected void internalDeregisterApplication(
 	}
 
 	@Override
-	public void startNewWorker(ResourceProfile resourceProfile) {
+	public Collection<ResourceProfile> startNewWorker(ResourceProfile resourceProfile) {
 		LOG.info("Starting a new worker.");
 		try {
 			// generate new workers into persistent state and launch associated actors
@@ -434,7 +439,7 @@ public void startNewWorker(ResourceProfile resourceProfile) {
 			workerStore.putWorker(worker);
 			workersInNew.put(extractResourceID(worker.taskID()), worker);
 
-			LaunchableMesosWorker launchable = createLaunchableMesosWorker(worker.taskID(), resourceProfile);
+			LaunchableMesosWorker launchable = createLaunchableMesosWorker(worker.taskID());
 
 			LOG.info("Scheduling Mesos task {} with ({} MB, {} cpus).",
 				launchable.taskID().getValue(), launchable.taskRequest().getMemory(), launchable.taskRequest().getCPUs());
@@ -443,9 +448,12 @@ public void startNewWorker(ResourceProfile resourceProfile) {
 			taskMonitor.tell(new TaskMonitor.TaskGoalStateUpdated(extractGoalState(worker)), selfActor);
 
 			// tell the launch coordinator to launch the new tasks
-			launchCoordinator.tell(new LaunchCoordinator.Launch(Collections.singletonList((LaunchableTask) launchable)), selfActor);
+			launchCoordinator.tell(new LaunchCoordinator.Launch(Collections.singletonList(launchable)), selfActor);
+
+			return slotsPerWorker;
 		} catch (Exception ex) {
 			onFatalError(new ResourceManagerException("Unable to request new workers.", ex));
+			return Collections.emptyList();
 		}
 	}
 
@@ -691,36 +699,13 @@ public void taskTerminated(TaskMonitor.TaskTerminated message) {
 	/**
 	 * Creates a launchable task for Fenzo to process.
 	 */
-	private LaunchableMesosWorker createLaunchableMesosWorker(Protos.TaskID taskID, ResourceProfile resourceProfile) {
-
-		// create the specific TM parameters from the resource profile and some defaults
-		MesosTaskManagerParameters params = new MesosTaskManagerParameters(
-			resourceProfile.getCpuCores() < 1.0 ? taskManagerParameters.cpus() : resourceProfile.getCpuCores(),
-			taskManagerParameters.gpus(),
-			taskManagerParameters.containerType(),
-			taskManagerParameters.containerImageName(),
-			new ContaineredTaskManagerParameters(
-				ResourceProfile.UNKNOWN.equals(resourceProfile) ? taskManagerParameters.containeredParameters().taskManagerTotalMemoryMB() : resourceProfile.getMemoryInMB(),
-				ResourceProfile.UNKNOWN.equals(resourceProfile) ? taskManagerParameters.containeredParameters().taskManagerHeapSizeMB() : resourceProfile.getHeapMemoryInMB(),
-				ResourceProfile.UNKNOWN.equals(resourceProfile) ? taskManagerParameters.containeredParameters().taskManagerDirectMemoryLimitMB() : resourceProfile.getDirectMemoryInMB(),
-				1,
-				new HashMap<>(taskManagerParameters.containeredParameters().taskManagerEnv())),
-			taskManagerParameters.containerVolumes(),
-			taskManagerParameters.dockerParameters(),
-			taskManagerParameters.dockerForcePullImage(),
-			taskManagerParameters.constraints(),
-			taskManagerParameters.command(),
-			taskManagerParameters.bootstrapCommand(),
-			taskManagerParameters.getTaskManagerHostname(),
-			taskManagerParameters.uris()
-		);
-
-		LOG.debug("LaunchableMesosWorker parameters: {}", params);
+	private LaunchableMesosWorker createLaunchableMesosWorker(Protos.TaskID taskID) {
+		LOG.debug("LaunchableMesosWorker parameters: {}", taskManagerParameters);
 
 		LaunchableMesosWorker launchable =
 			new LaunchableMesosWorker(
 				artifactServer,
-				params,
+				taskManagerParameters,
 				taskManagerContainerSpec,
 				taskID,
 				mesosConfig);
diff --git a/flink-mesos/src/test/java/org/apache/flink/mesos/runtime/clusterframework/MesosResourceManagerTest.java b/flink-mesos/src/test/java/org/apache/flink/mesos/runtime/clusterframework/MesosResourceManagerTest.java
index e21f0fc3374..5163724ed6d 100644
--- a/flink-mesos/src/test/java/org/apache/flink/mesos/runtime/clusterframework/MesosResourceManagerTest.java
+++ b/flink-mesos/src/test/java/org/apache/flink/mesos/runtime/clusterframework/MesosResourceManagerTest.java
@@ -242,7 +242,7 @@ protected void closeTaskManagerConnection(ResourceID resourceID, Exception cause
 		TestingMesosResourceManager resourceManager;
 
 		// domain objects for test purposes
-		final ResourceProfile resourceProfile1 = new ResourceProfile(1.0, 1);
+		final ResourceProfile resourceProfile1 = ResourceProfile.UNKNOWN;
 
 		Protos.FrameworkID framework1 = Protos.FrameworkID.newBuilder().setValue("framework1").build();
 		public Protos.SlaveID slave1 = Protos.SlaveID.newBuilder().setValue("slave1").build();
diff --git a/flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/types/ResourceProfile.java b/flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/types/ResourceProfile.java
index a89b9f92b17..5b133e7b624 100644
--- a/flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/types/ResourceProfile.java
+++ b/flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/types/ResourceProfile.java
@@ -50,6 +50,9 @@
 
 	public static final ResourceProfile UNKNOWN = new ResourceProfile(-1.0, -1);
 
+	/** ResourceProfile which matches any other ResourceProfile. */
+	public static final ResourceProfile ANY = new ResourceProfile(Double.MAX_VALUE, Integer.MAX_VALUE, Integer.MAX_VALUE, Integer.MAX_VALUE, Integer.MAX_VALUE, Collections.emptyMap());
+
 	// ------------------------------------------------------------------------
 
 	/** How many cpu cores are needed, use double so we can specify cpu like 0.1. */
diff --git a/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/ResourceManager.java b/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/ResourceManager.java
index ac1181b1d1d..7929e3170b7 100644
--- a/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/ResourceManager.java
+++ b/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/ResourceManager.java
@@ -71,6 +71,7 @@
 
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
@@ -1019,9 +1020,10 @@ protected abstract void internalDeregisterApplication(
 	 * Allocates a resource using the resource profile.
 	 *
 	 * @param resourceProfile The resource description
+	 * @return Collection of {@link ResourceProfile} describing the launched slots
 	 */
 	@VisibleForTesting
-	public abstract void startNewWorker(ResourceProfile resourceProfile);
+	public abstract Collection<ResourceProfile> startNewWorker(ResourceProfile resourceProfile);
 
 	/**
 	 * Callback when a worker was started.
@@ -1051,9 +1053,9 @@ public void releaseResource(InstanceID instanceId, Exception cause) {
 		}
 
 		@Override
-		public void allocateResource(ResourceProfile resourceProfile) throws ResourceManagerException {
+		public Collection<ResourceProfile> allocateResource(ResourceProfile resourceProfile) {
 			validateRunsInMainThread();
-			startNewWorker(resourceProfile);
+			return startNewWorker(resourceProfile);
 		}
 
 		@Override
@@ -1176,8 +1178,16 @@ public void reportPayload(ResourceID resourceID, Void payload) {
 	//  Resource Management
 	// ------------------------------------------------------------------------
 
-	protected int getNumberPendingSlotRequests() {
-		return slotManager.getNumberPendingSlotRequests();
+	protected int getNumberRequiredTaskManagerSlots() {
+		return slotManager.getNumberPendingTaskManagerSlots();
+	}
+
+	// ------------------------------------------------------------------------
+	//  Helper methods
+	// ------------------------------------------------------------------------
+
+	protected static Collection<ResourceProfile> createSlotsPerWorker(int numSlots) {
+		return Collections.nCopies(numSlots, ResourceProfile.ANY);
 	}
 }
 
diff --git a/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/StandaloneResourceManager.java b/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/StandaloneResourceManager.java
index 420b89f39f2..064c2d361d2 100644
--- a/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/StandaloneResourceManager.java
+++ b/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/StandaloneResourceManager.java
@@ -32,6 +32,9 @@
 
 import javax.annotation.Nullable;
 
+import java.util.Collection;
+import java.util.Collections;
+
 /**
  * A standalone implementation of the resource manager. Used when the system is started in
  * standalone mode (via scripts), rather than via a resource framework like YARN or Mesos.
@@ -74,7 +77,8 @@ protected void internalDeregisterApplication(ApplicationStatus finalStatus, @Nul
 	}
 
 	@Override
-	public void startNewWorker(ResourceProfile resourceProfile) {
+	public Collection<ResourceProfile> startNewWorker(ResourceProfile resourceProfile) {
+		return Collections.emptyList();
 	}
 
 	@Override
diff --git a/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/PendingSlotRequest.java b/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/PendingSlotRequest.java
index 17cf8c7907e..a8f212fe6d4 100644
--- a/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/PendingSlotRequest.java
+++ b/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/PendingSlotRequest.java
@@ -25,10 +25,14 @@
 import org.apache.flink.runtime.resourcemanager.SlotRequest;
 import org.apache.flink.util.Preconditions;
 
+import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
 import java.util.concurrent.CompletableFuture;
 
+/**
+ * Class representing a pending slot request in the {@link SlotManager}.
+ */
 public class PendingSlotRequest {
 
 	private final SlotRequest slotRequest;
@@ -36,11 +40,16 @@
 	@Nullable
 	private CompletableFuture<Acknowledge> requestFuture;
 
+	@Nullable
+	private PendingTaskManagerSlot pendingTaskManagerSlot;
+
 	/** Timestamp when this pending slot request has been created. */
 	private final long creationTimestamp;
 
 	public PendingSlotRequest(SlotRequest slotRequest) {
 		this.slotRequest = Preconditions.checkNotNull(slotRequest);
+		this.requestFuture = null;
+		this.pendingTaskManagerSlot = null;
 		creationTimestamp = System.currentTimeMillis();
 	}
 
@@ -78,4 +87,18 @@ public void setRequestFuture(@Nullable CompletableFuture<Acknowledge> requestFut
 	public CompletableFuture<Acknowledge> getRequestFuture() {
 		return requestFuture;
 	}
+
+	@Nullable
+	public PendingTaskManagerSlot getAssignedPendingTaskManagerSlot() {
+		return pendingTaskManagerSlot;
+	}
+
+	public void assignPendingTaskManagerSlot(@Nonnull PendingTaskManagerSlot pendingTaskManagerSlotToAssign) {
+		Preconditions.checkState(pendingTaskManagerSlot == null);
+		this.pendingTaskManagerSlot = pendingTaskManagerSlotToAssign;
+	}
+
+	public void unassignPendingTaskManagerSlot() {
+		this.pendingTaskManagerSlot = null;
+	}
 }
diff --git a/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/PendingTaskManagerSlot.java b/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/PendingTaskManagerSlot.java
new file mode 100644
index 00000000000..ed207e963e3
--- /dev/null
+++ b/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/PendingTaskManagerSlot.java
@@ -0,0 +1,64 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.resourcemanager.slotmanager;
+
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.util.Preconditions;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+/**
+ * Represents a pending task manager slot in the {@link SlotManager}.
+ */
+public class PendingTaskManagerSlot {
+
+	private final TaskManagerSlotId taskManagerSlotId = TaskManagerSlotId.generate();
+
+	private final ResourceProfile resourceProfile;
+
+	@Nullable
+	private PendingSlotRequest pendingSlotRequest;
+
+	public PendingTaskManagerSlot(ResourceProfile resourceProfile) {
+		this.resourceProfile = resourceProfile;
+	}
+
+	public TaskManagerSlotId getTaskManagerSlotId() {
+		return taskManagerSlotId;
+	}
+
+	public ResourceProfile getResourceProfile() {
+		return resourceProfile;
+	}
+
+	public void assignPendingSlotRequest(@Nonnull PendingSlotRequest pendingSlotRequestToAssign) {
+		Preconditions.checkState(pendingSlotRequest == null);
+		pendingSlotRequest = pendingSlotRequestToAssign;
+	}
+
+	public void unassignPendingSlotRequest() {
+		pendingSlotRequest = null;
+	}
+
+	@Nullable
+	public PendingSlotRequest getAssignedPendingSlotRequest() {
+		return pendingSlotRequest;
+	}
+}
diff --git a/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/ResourceActions.java b/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/ResourceActions.java
index 84e7c4e785d..adf8f13db57 100644
--- a/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/ResourceActions.java
+++ b/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/ResourceActions.java
@@ -24,6 +24,8 @@
 import org.apache.flink.runtime.instance.InstanceID;
 import org.apache.flink.runtime.resourcemanager.exceptions.ResourceManagerException;
 
+import java.util.Collection;
+
 /**
  * Resource related actions which the {@link SlotManager} can perform.
  */
@@ -41,9 +43,10 @@
 	 * Requests to allocate a resource with the given {@link ResourceProfile}.
 	 *
 	 * @param resourceProfile for the to be allocated resource
+	 * @return Collection of {@link ResourceProfile} describing the allocated slots
 	 * @throws ResourceManagerException if the resource cannot be allocated
 	 */
-	void allocateResource(ResourceProfile resourceProfile) throws ResourceManagerException;
+	Collection<ResourceProfile> allocateResource(ResourceProfile resourceProfile) throws ResourceManagerException;
 
 	/**
 	 * Notifies that an allocation failure has occurred.
diff --git a/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/SlotManager.java b/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/SlotManager.java
index bab56609a1b..2ef2b2fefcc 100644
--- a/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/SlotManager.java
+++ b/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/SlotManager.java
@@ -43,14 +43,17 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.Objects;
+import java.util.Optional;
 import java.util.concurrent.CancellationException;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.Executor;
@@ -99,6 +102,8 @@
 	/** Map of pending/unfulfilled slot allocation requests. */
 	private final HashMap<AllocationID, PendingSlotRequest> pendingSlotRequests;
 
+	private final HashMap<TaskManagerSlotId, PendingTaskManagerSlot> pendingSlots;
+
 	/** ResourceManager's id. */
 	private ResourceManagerId resourceManagerId;
 
@@ -130,6 +135,7 @@ public SlotManager(
 		taskManagerRegistrations = new HashMap<>(4);
 		fulfilledSlotRequests = new HashMap<>(16);
 		pendingSlotRequests = new HashMap<>(16);
+		pendingSlots = new HashMap<>(16);
 
 		resourceManagerId = null;
 		resourceActions = null;
@@ -168,8 +174,13 @@ public int getNumberFreeSlotsOf(InstanceID instanceId) {
 		}
 	}
 
-	public int getNumberPendingSlotRequests() {
-		return pendingSlotRequests.size();
+	public int getNumberPendingTaskManagerSlots() {
+		return pendingSlots.size();
+	}
+
+	@VisibleForTesting
+	int getNumberAssignedPendingTaskManagerSlots() {
+		return (int) pendingSlots.values().stream().filter(slot -> slot.getAssignedPendingSlotRequest() != null).count();
 	}
 
 	// ---------------------------------------------------------------------------------------------
@@ -530,14 +541,50 @@ private void registerSlot(
 			removeSlot(slotId);
 		}
 
-		TaskManagerSlot slot = new TaskManagerSlot(
+		final TaskManagerSlot slot = createAndRegisterTaskManagerSlot(slotId, resourceProfile, taskManagerConnection);
+
+		final PendingTaskManagerSlot pendingTaskManagerSlot;
+
+		if (allocationId == null) {
+			pendingTaskManagerSlot = findExactlyMatchingPendingTaskManagerSlot(resourceProfile);
+		} else {
+			pendingTaskManagerSlot = null;
+		}
+
+		if (pendingTaskManagerSlot == null) {
+			updateSlot(slotId, allocationId, jobId);
+		} else {
+			pendingSlots.remove(pendingTaskManagerSlot.getTaskManagerSlotId());
+			final PendingSlotRequest assignedPendingSlotRequest = pendingTaskManagerSlot.getAssignedPendingSlotRequest();
+
+			if (assignedPendingSlotRequest == null) {
+				handleFreeSlot(slot);
+			} else {
+				assignedPendingSlotRequest.unassignPendingTaskManagerSlot();
+				allocateSlot(slot, assignedPendingSlotRequest);
+			}
+		}
+	}
+
+	@Nonnull
+	private TaskManagerSlot createAndRegisterTaskManagerSlot(SlotID slotId, ResourceProfile resourceProfile, TaskExecutorConnection taskManagerConnection) {
+		final TaskManagerSlot slot = new TaskManagerSlot(
 			slotId,
 			resourceProfile,
 			taskManagerConnection);
-
 		slots.put(slotId, slot);
+		return slot;
+	}
 
-		updateSlot(slotId, allocationId, jobId);
+	@Nullable
+	private PendingTaskManagerSlot findExactlyMatchingPendingTaskManagerSlot(ResourceProfile resourceProfile) {
+		for (PendingTaskManagerSlot pendingTaskManagerSlot : pendingSlots.values()) {
+			if (pendingTaskManagerSlot.getResourceProfile().equals(resourceProfile)) {
+				return pendingTaskManagerSlot;
+			}
+		}
+
+		return null;
 	}
 
 	/**
@@ -595,7 +642,11 @@ private void updateSlotState(
 						slot.updateAllocation(allocationId, jobId);
 
 						// remove the pending request if any as it has been assigned
-						pendingSlotRequests.remove(allocationId);
+						final PendingSlotRequest actualPendingSlotRequest = pendingSlotRequests.remove(allocationId);
+
+						if (actualPendingSlotRequest != null) {
+							cancelPendingSlotRequest(actualPendingSlotRequest);
+						}
 
 						// this will try to find a new slot for the request
 						rejectPendingSlotRequest(
@@ -650,13 +701,54 @@ private void updateSlotState(
 	 * @throws ResourceManagerException if the resource manager cannot allocate more resource
 	 */
 	private void internalRequestSlot(PendingSlotRequest pendingSlotRequest) throws ResourceManagerException {
-		TaskManagerSlot taskManagerSlot = findMatchingSlot(pendingSlotRequest.getResourceProfile());
+		final ResourceProfile resourceProfile = pendingSlotRequest.getResourceProfile();
+		TaskManagerSlot taskManagerSlot = findMatchingSlot(resourceProfile);
 
 		if (taskManagerSlot != null) {
 			allocateSlot(taskManagerSlot, pendingSlotRequest);
 		} else {
-			resourceActions.allocateResource(pendingSlotRequest.getResourceProfile());
+			Optional<PendingTaskManagerSlot> pendingTaskManagerSlotOptional = findFreeMatchingPendingTaskManagerSlot(resourceProfile);
+
+			if (!pendingTaskManagerSlotOptional.isPresent()) {
+				pendingTaskManagerSlotOptional = allocateResource(resourceProfile);
+			}
+
+			pendingTaskManagerSlotOptional.ifPresent(pendingTaskManagerSlot -> assignPendingTaskManagerSlot(pendingSlotRequest, pendingTaskManagerSlot));
+		}
+	}
+
+	private Optional<PendingTaskManagerSlot> findFreeMatchingPendingTaskManagerSlot(ResourceProfile requiredResourceProfile) {
+		for (PendingTaskManagerSlot pendingTaskManagerSlot : pendingSlots.values()) {
+			if (pendingTaskManagerSlot.getAssignedPendingSlotRequest() == null && pendingTaskManagerSlot.getResourceProfile().isMatching(requiredResourceProfile)) {
+				return Optional.of(pendingTaskManagerSlot);
+			}
 		}
+
+		return Optional.empty();
+	}
+
+	private Optional<PendingTaskManagerSlot> allocateResource(ResourceProfile resourceProfile) throws ResourceManagerException {
+		final Collection<ResourceProfile> requestedSlots = resourceActions.allocateResource(resourceProfile);
+
+		if (requestedSlots.isEmpty()) {
+			return Optional.empty();
+		} else {
+			final Iterator<ResourceProfile> slotIterator = requestedSlots.iterator();
+			final PendingTaskManagerSlot pendingTaskManagerSlot = new PendingTaskManagerSlot(slotIterator.next());
+			pendingSlots.put(pendingTaskManagerSlot.getTaskManagerSlotId(), pendingTaskManagerSlot);
+
+			while (slotIterator.hasNext()) {
+				final PendingTaskManagerSlot additionalPendingTaskManagerSlot = new PendingTaskManagerSlot(slotIterator.next());
+				pendingSlots.put(additionalPendingTaskManagerSlot.getTaskManagerSlotId(), additionalPendingTaskManagerSlot);
+			}
+
+			return Optional.of(pendingTaskManagerSlot);
+		}
+	}
+
+	private void assignPendingTaskManagerSlot(PendingSlotRequest pendingSlotRequest, PendingTaskManagerSlot pendingTaskManagerSlot) {
+		pendingTaskManagerSlot.assignPendingSlotRequest(pendingSlotRequest);
+		pendingSlotRequest.assignPendingTaskManagerSlot(pendingTaskManagerSlot);
 	}
 
 	/**
@@ -680,6 +772,8 @@ private void allocateSlot(TaskManagerSlot taskManagerSlot, PendingSlotRequest pe
 		taskManagerSlot.assignPendingSlotRequest(pendingSlotRequest);
 		pendingSlotRequest.setRequestFuture(completableFuture);
 
+		returnPendingTaskManagerSlotIfAssigned(pendingSlotRequest);
+
 		TaskManagerRegistration taskManagerRegistration = taskManagerRegistrations.get(instanceID);
 
 		if (taskManagerRegistration == null) {
@@ -733,6 +827,14 @@ private void allocateSlot(TaskManagerSlot taskManagerSlot, PendingSlotRequest pe
 			mainThreadExecutor);
 	}
 
+	private void returnPendingTaskManagerSlotIfAssigned(PendingSlotRequest pendingSlotRequest) {
+		final PendingTaskManagerSlot pendingTaskManagerSlot = pendingSlotRequest.getAssignedPendingTaskManagerSlot();
+		if (pendingTaskManagerSlot != null) {
+			pendingTaskManagerSlot.unassignPendingSlotRequest();
+			pendingSlotRequest.unassignPendingTaskManagerSlot();
+		}
+	}
+
 	/**
 	 * Handles a free slot. It first tries to find a pending slot request which can be fulfilled.
 	 * If there is no such request, then it will add the slot to the set of free slots.
@@ -886,6 +988,8 @@ private void rejectPendingSlotRequest(PendingSlotRequest pendingSlotRequest, Exc
 	private void cancelPendingSlotRequest(PendingSlotRequest pendingSlotRequest) {
 		CompletableFuture<Acknowledge> request = pendingSlotRequest.getRequestFuture();
 
+		returnPendingTaskManagerSlotIfAssigned(pendingSlotRequest);
+
 		if (null != request) {
 			request.cancel(false);
 		}
@@ -911,9 +1015,10 @@ private void checkTaskManagerTimeouts() {
 			}
 
 			// second we trigger the release resource callback which can decide upon the resource release
+			final FlinkException cause = new FlinkException("TaskExecutor exceeded the idle timeout.");
 			for (InstanceID timedOutTaskManagerId : timedOutTaskManagerIds) {
 				LOG.debug("Release TaskExecutor {} because it exceeded the idle timeout.", timedOutTaskManagerId);
-				resourceActions.releaseResource(timedOutTaskManagerId, new FlinkException("TaskExecutor exceeded the idle timeout."));
+				resourceActions.releaseResource(timedOutTaskManagerId, cause);
 			}
 		}
 	}
diff --git a/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/TaskManagerSlotId.java b/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/TaskManagerSlotId.java
new file mode 100644
index 00000000000..3084b3e8ed9
--- /dev/null
+++ b/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/TaskManagerSlotId.java
@@ -0,0 +1,36 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.resourcemanager.slotmanager;
+
+import org.apache.flink.runtime.clusterframework.types.TaskManagerSlot;
+import org.apache.flink.util.AbstractID;
+
+/**
+ * Id of {@link TaskManagerSlot} and {@link PendingTaskManagerSlot}.
+ */
+public class TaskManagerSlotId extends AbstractID {
+
+	private static final long serialVersionUID = -4024240625523472071L;
+
+	private TaskManagerSlotId() {}
+
+	public static TaskManagerSlotId generate() {
+		return new TaskManagerSlotId();
+	}
+}
diff --git a/flink-runtime/src/main/java/org/apache/flink/runtime/taskexecutor/TaskManagerServices.java b/flink-runtime/src/main/java/org/apache/flink/runtime/taskexecutor/TaskManagerServices.java
index 0e98e44ab0d..c46d800bc95 100644
--- a/flink-runtime/src/main/java/org/apache/flink/runtime/taskexecutor/TaskManagerServices.java
+++ b/flink-runtime/src/main/java/org/apache/flink/runtime/taskexecutor/TaskManagerServices.java
@@ -246,7 +246,7 @@ public static TaskManagerServices fromConfiguration(
 		final List<ResourceProfile> resourceProfiles = new ArrayList<>(taskManagerServicesConfiguration.getNumberOfSlots());
 
 		for (int i = 0; i < taskManagerServicesConfiguration.getNumberOfSlots(); i++) {
-			resourceProfiles.add(new ResourceProfile(1.0, 42));
+			resourceProfiles.add(ResourceProfile.ANY);
 		}
 
 		final TimerService<AllocationID> timerService = new TimerService<>(
@@ -259,7 +259,6 @@ public static TaskManagerServices fromConfiguration(
 
 		final JobLeaderService jobLeaderService = new JobLeaderService(taskManagerLocation);
 
-
 		final String[] stateRootDirectoryStrings = taskManagerServicesConfiguration.getLocalRecoveryStateRootDirectories();
 
 		final File[] stateRootDirectoryFiles = new File[stateRootDirectoryStrings.length];
diff --git a/flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/TestingResourceManager.java b/flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/TestingResourceManager.java
index 0b56231d4a4..e8207019a32 100644
--- a/flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/TestingResourceManager.java
+++ b/flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/TestingResourceManager.java
@@ -32,6 +32,9 @@
 
 import javax.annotation.Nullable;
 
+import java.util.Collection;
+import java.util.Collections;
+
 /**
  * Simple {@link ResourceManager} implementation for testing purposes.
  */
@@ -71,8 +74,8 @@ protected void internalDeregisterApplication(ApplicationStatus finalStatus, @Nul
 	}
 
 	@Override
-	public void startNewWorker(ResourceProfile resourceProfile) {
-		// noop
+	public Collection<ResourceProfile> startNewWorker(ResourceProfile resourceProfile) {
+		return Collections.emptyList();
 	}
 
 	@Override
diff --git a/flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/slotmanager/SlotManagerTest.java b/flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/slotmanager/SlotManagerTest.java
index 8a7f733a3fa..33a696a1d24 100644
--- a/flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/slotmanager/SlotManagerTest.java
+++ b/flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/slotmanager/SlotManagerTest.java
@@ -47,6 +47,7 @@
 import org.apache.flink.runtime.testingUtils.TestingUtils;
 import org.apache.flink.util.FlinkException;
 import org.apache.flink.util.TestLogger;
+import org.apache.flink.util.function.FunctionWithException;
 
 import org.junit.Test;
 import org.mockito.ArgumentCaptor;
@@ -54,7 +55,9 @@
 import javax.annotation.Nonnull;
 
 import java.util.ArrayDeque;
+import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collection;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
@@ -67,6 +70,7 @@
 import java.util.concurrent.Executor;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
+import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.stream.Collectors;
 
@@ -84,9 +88,7 @@
 import static org.mockito.Matchers.any;
 import static org.mockito.Matchers.anyString;
 import static org.mockito.Matchers.eq;
-import static org.mockito.Mockito.doThrow;
 import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.timeout;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
@@ -103,9 +105,9 @@
 	@Test
 	public void testTaskManagerRegistration() throws Exception {
 		final ResourceManagerId resourceManagerId = ResourceManagerId.generate();
-		final ResourceActions resourceManagerActions = mock(ResourceActions.class);
+		final ResourceActions resourceManagerActions = new TestingResourceActionsBuilder().build();
 
-		final TaskExecutorGateway taskExecutorGateway = mock(TaskExecutorGateway.class);
+		final TaskExecutorGateway taskExecutorGateway = new TestingTaskExecutorGatewayBuilder().createTestingTaskExecutorGateway();
 		final ResourceID resourceId = ResourceID.generate();
 		final TaskExecutorConnection taskManagerConnection = new TaskExecutorConnection(resourceId, taskExecutorGateway);
 
@@ -135,14 +137,12 @@ public void testTaskManagerUnregistration() throws Exception {
 		final ResourceActions resourceManagerActions = mock(ResourceActions.class);
 		final JobID jobId = new JobID();
 
-		final TaskExecutorGateway taskExecutorGateway = mock(TaskExecutorGateway.class);
-		when(taskExecutorGateway.requestSlot(
-			any(SlotID.class),
-			any(JobID.class),
-			any(AllocationID.class),
-			anyString(),
-			eq(resourceManagerId),
-			any(Time.class))).thenReturn(new CompletableFuture<>());
+		final TaskExecutorGateway taskExecutorGateway = new TestingTaskExecutorGatewayBuilder()
+			.setRequestSlotFunction(tuple5 -> {
+				assertThat(tuple5.f4, is(equalTo(resourceManagerId)));
+				return new CompletableFuture<>();
+			})
+			.createTestingTaskExecutorGateway();
 
 		final ResourceID resourceId = ResourceID.generate();
 		final TaskExecutorConnection taskManagerConnection = new TaskExecutorConnection(resourceId, taskExecutorGateway);
@@ -202,13 +202,16 @@ public void testSlotRequestWithoutFreeSlots() throws Exception {
 			resourceProfile,
 			"localhost");
 
-		ResourceActions resourceManagerActions = mock(ResourceActions.class);
+		CompletableFuture<ResourceProfile> allocateResourceFuture = new CompletableFuture<>();
+		ResourceActions resourceManagerActions = new TestingResourceActionsBuilder()
+			.setAllocateResourceConsumer(allocateResourceFuture::complete)
+			.build();
 
 		try (SlotManager slotManager = createSlotManager(resourceManagerId, resourceManagerActions)) {
 
 			slotManager.registerSlotRequest(slotRequest);
 
-			verify(resourceManagerActions).allocateResource(eq(resourceProfile));
+			assertThat(allocateResourceFuture.get(), is(equalTo(resourceProfile)));
 		}
 	}
 
@@ -225,8 +228,11 @@ public void testSlotRequestWithResourceAllocationFailure() throws Exception {
 			resourceProfile,
 			"localhost");
 
-		ResourceActions resourceManagerActions = mock(ResourceActions.class);
-		doThrow(new ResourceManagerException("Test exception")).when(resourceManagerActions).allocateResource(any(ResourceProfile.class));
+		ResourceActions resourceManagerActions = new TestingResourceActionsBuilder()
+			.setAllocateResourceFunction(value -> {
+				throw new ResourceManagerException("Test exception");
+			})
+			.build();
 
 		try (SlotManager slotManager = createSlotManager(resourceManagerId, resourceManagerActions)) {
 
@@ -257,19 +263,17 @@ public void testSlotRequestWithFreeSlot() throws Exception {
 			resourceProfile,
 			targetAddress);
 
-		ResourceActions resourceManagerActions = mock(ResourceActions.class);
+		ResourceActions resourceManagerActions = new TestingResourceActionsBuilder().build();
 
 		try (SlotManager slotManager = createSlotManager(resourceManagerId, resourceManagerActions)) {
-
+			final CompletableFuture<Tuple5<SlotID, JobID, AllocationID, String, ResourceManagerId>> requestFuture = new CompletableFuture<>();
 			// accept an incoming slot request
-			final TaskExecutorGateway taskExecutorGateway = mock(TaskExecutorGateway.class);
-			when(taskExecutorGateway.requestSlot(
-				eq(slotId),
-				eq(jobId),
-				eq(allocationId),
-				anyString(),
-				eq(resourceManagerId),
-				any(Time.class))).thenReturn(CompletableFuture.completedFuture(Acknowledge.get()));
+			final TaskExecutorGateway taskExecutorGateway = new TestingTaskExecutorGatewayBuilder()
+				.setRequestSlotFunction(tuple5 -> {
+					requestFuture.complete(Tuple5.of(tuple5.f0, tuple5.f1, tuple5.f2, tuple5.f3, tuple5.f4));
+					return CompletableFuture.completedFuture(Acknowledge.get());
+				})
+				.createTestingTaskExecutorGateway();
 
 			final TaskExecutorConnection taskExecutorConnection = new TaskExecutorConnection(resourceID, taskExecutorGateway);
 
@@ -282,7 +286,7 @@ public void testSlotRequestWithFreeSlot() throws Exception {
 
 			assertTrue("The slot request should be accepted", slotManager.registerSlotRequest(slotRequest));
 
-			verify(taskExecutorGateway).requestSlot(eq(slotId), eq(jobId), eq(allocationId), eq(targetAddress), eq(resourceManagerId), any(Time.class));
+			assertThat(requestFuture.get(), is(equalTo(Tuple5.of(slotId, jobId, allocationId, targetAddress, resourceManagerId))));
 
 			TaskManagerSlot slot = slotManager.getSlot(slotId);
 
@@ -302,14 +306,9 @@ public void testUnregisterPendingSlotRequest() throws Exception {
 		final SlotID slotId = new SlotID(resourceID, 0);
 		final AllocationID allocationId = new AllocationID();
 
-		final TaskExecutorGateway taskExecutorGateway = mock(TaskExecutorGateway.class);
-		when(taskExecutorGateway.requestSlot(
-			any(SlotID.class),
-			any(JobID.class),
-			any(AllocationID.class),
-			anyString(),
-			eq(resourceManagerId),
-			any(Time.class))).thenReturn(new CompletableFuture<>());
+		final TaskExecutorGateway taskExecutorGateway = new TestingTaskExecutorGatewayBuilder()
+			.setRequestSlotFunction(slotIDJobIDAllocationIDStringResourceManagerIdTuple5 -> new CompletableFuture<>())
+			.createTestingTaskExecutorGateway();
 
 		final ResourceProfile resourceProfile = new ResourceProfile(1.0, 1);
 		final SlotStatus slotStatus = new SlotStatus(slotId, resourceProfile);
@@ -357,17 +356,19 @@ public void testFulfillingPendingSlotRequest() throws Exception {
 			resourceProfile,
 			targetAddress);
 
-		ResourceActions resourceManagerActions = mock(ResourceActions.class);
+		final AtomicInteger numberAllocateResourceCalls = new AtomicInteger(0);
+		ResourceActions resourceManagerActions = new TestingResourceActionsBuilder()
+			.setAllocateResourceConsumer(ignored -> numberAllocateResourceCalls.incrementAndGet())
+			.build();
 
+		final CompletableFuture<Tuple5<SlotID, JobID, AllocationID, String, ResourceManagerId>> requestFuture = new CompletableFuture<>();
 		// accept an incoming slot request
-		final TaskExecutorGateway taskExecutorGateway = mock(TaskExecutorGateway.class);
-		when(taskExecutorGateway.requestSlot(
-			eq(slotId),
-			eq(jobId),
-			eq(allocationId),
-			anyString(),
-			eq(resourceManagerId),
-			any(Time.class))).thenReturn(CompletableFuture.completedFuture(Acknowledge.get()));
+		final TaskExecutorGateway taskExecutorGateway = new TestingTaskExecutorGatewayBuilder()
+			.setRequestSlotFunction(tuple5 -> {
+				requestFuture.complete(Tuple5.of(tuple5.f0, tuple5.f1, tuple5.f2, tuple5.f3, tuple5.f4));
+				return CompletableFuture.completedFuture(Acknowledge.get());
+			})
+			.createTestingTaskExecutorGateway();
 
 		final TaskExecutorConnection taskExecutorConnection = new TaskExecutorConnection(resourceID, taskExecutorGateway);
 
@@ -378,13 +379,13 @@ public void testFulfillingPendingSlotRequest() throws Exception {
 
 			assertTrue("The slot request should be accepted", slotManager.registerSlotRequest(slotRequest));
 
-			verify(resourceManagerActions, times(1)).allocateResource(eq(resourceProfile));
+			assertThat(numberAllocateResourceCalls.get(), is(1));
 
 			slotManager.registerTaskManager(
 				taskExecutorConnection,
 				slotReport);
 
-			verify(taskExecutorGateway).requestSlot(eq(slotId), eq(jobId), eq(allocationId), eq(targetAddress), eq(resourceManagerId), any(Time.class));
+			assertThat(requestFuture.get(), is(equalTo(Tuple5.of(slotId, jobId, allocationId, targetAddress, resourceManagerId))));
 
 			TaskManagerSlot slot = slotManager.getSlot(slotId);
 
@@ -444,7 +445,10 @@ public void testFreeSlot() throws Exception {
 	@Test
 	public void testDuplicatePendingSlotRequest() throws Exception {
 		final ResourceManagerId resourceManagerId = ResourceManagerId.generate();
-		final ResourceActions resourceManagerActions = mock(ResourceActions.class);
+		final AtomicInteger numberAllocateResourceFunctionCalls = new AtomicInteger(0);
+		final ResourceActions resourceManagerActions = new TestingResourceActionsBuilder()
+			.setAllocateResourceConsumer(resourceProfile -> numberAllocateResourceFunctionCalls.incrementAndGet())
+			.build();
 		final AllocationID allocationId = new AllocationID();
 		final ResourceProfile resourceProfile1 = new ResourceProfile(1.0, 2);
 		final ResourceProfile resourceProfile2 = new ResourceProfile(2.0, 1);
@@ -458,7 +462,7 @@ public void testDuplicatePendingSlotRequest() throws Exception {
 
 		// check that we have only called the resource allocation only for the first slot request,
 		// since the second request is a duplicate
-		verify(resourceManagerActions, times(1)).allocateResource(any(ResourceProfile.class));
+		assertThat(numberAllocateResourceFunctionCalls.get(), is(1));
 	}
 
 	/**
@@ -497,21 +501,17 @@ public void testDuplicatePendingSlotRequestAfterSlotReport() throws Exception {
 	@Test
 	public void testDuplicatePendingSlotRequestAfterSuccessfulAllocation() throws Exception {
 		final ResourceManagerId resourceManagerId = ResourceManagerId.generate();
-		final ResourceActions resourceManagerActions = mock(ResourceActions.class);
+		final AtomicInteger allocateResourceCalls = new AtomicInteger(0);
+		final ResourceActions resourceManagerActions = new TestingResourceActionsBuilder()
+			.setAllocateResourceConsumer(resourceProfile -> allocateResourceCalls.incrementAndGet())
+			.build();
 		final AllocationID allocationId = new AllocationID();
 		final ResourceProfile resourceProfile1 = new ResourceProfile(1.0, 2);
 		final ResourceProfile resourceProfile2 = new ResourceProfile(2.0, 1);
 		final SlotRequest slotRequest1 = new SlotRequest(new JobID(), allocationId, resourceProfile1, "foobar");
 		final SlotRequest slotRequest2 = new SlotRequest(new JobID(), allocationId, resourceProfile2, "barfoo");
 
-		final TaskExecutorGateway taskExecutorGateway = mock(TaskExecutorGateway.class);
-		when(taskExecutorGateway.requestSlot(
-			any(SlotID.class),
-			any(JobID.class),
-			any(AllocationID.class),
-			anyString(),
-			eq(resourceManagerId),
-			any(Time.class))).thenReturn(CompletableFuture.completedFuture(Acknowledge.get()));
+		final TaskExecutorGateway taskExecutorGateway = new TestingTaskExecutorGatewayBuilder().createTestingTaskExecutorGateway();
 
 		final ResourceID resourceID = ResourceID.generate();
 
@@ -534,7 +534,7 @@ public void testDuplicatePendingSlotRequestAfterSuccessfulAllocation() throws Ex
 
 		// check that we have only called the resource allocation only for the first slot request,
 		// since the second request is a duplicate
-		verify(resourceManagerActions, never()).allocateResource(any(ResourceProfile.class));
+		assertThat(allocateResourceCalls.get(), is(0));
 	}
 
 	/**
@@ -544,21 +544,17 @@ public void testDuplicatePendingSlotRequestAfterSuccessfulAllocation() throws Ex
 	@Test
 	public void testAcceptingDuplicateSlotRequestAfterAllocationRelease() throws Exception {
 		final ResourceManagerId resourceManagerId = ResourceManagerId.generate();
-		final ResourceActions resourceManagerActions = mock(ResourceActions.class);
+		final AtomicInteger allocateResourceCalls = new AtomicInteger(0);
+		final ResourceActions resourceManagerActions = new TestingResourceActionsBuilder()
+			.setAllocateResourceConsumer(resourceProfile -> allocateResourceCalls.incrementAndGet())
+			.build();
 		final AllocationID allocationId = new AllocationID();
 		final ResourceProfile resourceProfile1 = new ResourceProfile(1.0, 2);
 		final ResourceProfile resourceProfile2 = new ResourceProfile(2.0, 1);
 		final SlotRequest slotRequest1 = new SlotRequest(new JobID(), allocationId, resourceProfile1, "foobar");
 		final SlotRequest slotRequest2 = new SlotRequest(new JobID(), allocationId, resourceProfile2, "barfoo");
 
-		final TaskExecutorGateway taskExecutorGateway = mock(TaskExecutorGateway.class);
-		when(taskExecutorGateway.requestSlot(
-			any(SlotID.class),
-			any(JobID.class),
-			any(AllocationID.class),
-			anyString(),
-			eq(resourceManagerId),
-			any(Time.class))).thenReturn(CompletableFuture.completedFuture(Acknowledge.get()));
+		final TaskExecutorGateway taskExecutorGateway = new TestingTaskExecutorGatewayBuilder().createTestingTaskExecutorGateway();
 
 		final ResourceID resourceID = ResourceID.generate();
 		final TaskExecutorConnection taskManagerConnection = new TaskExecutorConnection(resourceID, taskExecutorGateway);
@@ -588,7 +584,7 @@ public void testAcceptingDuplicateSlotRequestAfterAllocationRelease() throws Exc
 
 		// check that we have only called the resource allocation only for the first slot request,
 		// since the second request is a duplicate
-		verify(resourceManagerActions, never()).allocateResource(any(ResourceProfile.class));
+		assertThat(allocateResourceCalls.get(), is(0));
 	}
 
 	/**
@@ -624,7 +620,7 @@ public void testReceivingUnknownSlotReport() throws Exception {
 	@Test
 	public void testUpdateSlotReport() throws Exception {
 		final ResourceManagerId resourceManagerId = ResourceManagerId.generate();
-		final ResourceActions resourceManagerActions = mock(ResourceActions.class);
+		final ResourceActions resourceManagerActions = new TestingResourceActionsBuilder().build();
 
 		final JobID jobId = new JobID();
 		final AllocationID allocationId = new AllocationID();
@@ -678,13 +674,16 @@ public void testUpdateSlotReport() throws Exception {
 	 */
 	@Test
 	public void testTaskManagerTimeout() throws Exception {
-		final long tmTimeout = 500L;
+		final long tmTimeout = 10L;
 
-		final ResourceActions resourceManagerActions = mock(ResourceActions.class);
+		final CompletableFuture<InstanceID> releaseFuture = new CompletableFuture<>();
+		final ResourceActions resourceManagerActions = new TestingResourceActionsBuilder()
+			.setReleaseResourceConsumer((instanceID, e) -> releaseFuture.complete(instanceID))
+			.build();
 		final ResourceManagerId resourceManagerId = ResourceManagerId.generate();
 		final ResourceID resourceID = ResourceID.generate();
 
-		final TaskExecutorGateway taskExecutorGateway = mock(TaskExecutorGateway.class);
+		final TaskExecutorGateway taskExecutorGateway = new TestingTaskExecutorGatewayBuilder().createTestingTaskExecutorGateway();
 		final TaskExecutorConnection taskManagerConnection = new TaskExecutorConnection(resourceID, taskExecutorGateway);
 
 		final SlotID slotId = new SlotID(resourceID, 0);
@@ -702,15 +701,9 @@ public void testTaskManagerTimeout() throws Exception {
 
 			slotManager.start(resourceManagerId, mainThreadExecutor, resourceManagerActions);
 
-			mainThreadExecutor.execute(new Runnable() {
-				@Override
-				public void run() {
-					slotManager.registerTaskManager(taskManagerConnection, slotReport);
-				}
-			});
+			mainThreadExecutor.execute(() -> slotManager.registerTaskManager(taskManagerConnection, slotReport));
 
-			verify(resourceManagerActions, timeout(100L * tmTimeout).times(1))
-				.releaseResource(eq(taskManagerConnection.getInstanceID()), any(Exception.class));
+			assertThat(releaseFuture.get(), is(equalTo(taskManagerConnection.getInstanceID())));
 		}
 	}
 
@@ -723,7 +716,10 @@ public void run() {
 	public void testSlotRequestTimeout() throws Exception {
 		final long allocationTimeout = 50L;
 
-		final ResourceActions resourceManagerActions = mock(ResourceActions.class);
+		final CompletableFuture<Tuple2<JobID, AllocationID>> failedAllocationFuture = new CompletableFuture<>();
+		final ResourceActions resourceManagerActions = new TestingResourceActionsBuilder()
+			.setNotifyAllocationFailureConsumer(tuple3 -> failedAllocationFuture.complete(Tuple2.of(tuple3.f0, tuple3.f1)))
+			.build();
 		final ResourceManagerId resourceManagerId = ResourceManagerId.generate();
 		final JobID jobId = new JobID();
 		final AllocationID allocationId = new AllocationID();
@@ -743,21 +739,15 @@ public void testSlotRequestTimeout() throws Exception {
 
 			final AtomicReference<Exception> atomicException = new AtomicReference<>(null);
 
-			mainThreadExecutor.execute(new Runnable() {
-				@Override
-				public void run() {
-					try {
-						assertTrue(slotManager.registerSlotRequest(slotRequest));
-					} catch (Exception e) {
-						atomicException.compareAndSet(null, e);
-					}
+			mainThreadExecutor.execute(() -> {
+				try {
+					assertTrue(slotManager.registerSlotRequest(slotRequest));
+				} catch (Exception e) {
+					atomicException.compareAndSet(null, e);
 				}
 			});
 
-			verify(resourceManagerActions, timeout(100L * allocationTimeout).times(1)).notifyAllocationFailure(
-				eq(jobId),
-				eq(allocationId),
-				any(TimeoutException.class));
+			assertThat(failedAllocationFuture.get(), is(equalTo(Tuple2.of(jobId, allocationId))));
 
 			if (atomicException.get() != null) {
 				throw atomicException.get();
@@ -851,7 +841,7 @@ public void testTaskManagerSlotRequestTimeoutHandling() throws Exception {
 	public void testSlotReportWhileActiveSlotRequest() throws Exception {
 		final long verifyTimeout = 10000L;
 		final ResourceManagerId resourceManagerId = ResourceManagerId.generate();
-		final ResourceActions resourceManagerActions = mock(ResourceActions.class);
+		final ResourceActions resourceManagerActions = new TestingResourceActionsBuilder().build();
 
 		final JobID jobId = new JobID();
 		final AllocationID allocationId = new AllocationID();
@@ -966,10 +956,12 @@ public void testSlotReportWhileActiveSlotRequest() throws Exception {
 	@Test
 	public void testTimeoutForUnusedTaskManager() throws Exception {
 		final long taskManagerTimeout = 50L;
-		final long verifyTimeout = taskManagerTimeout * 10L;
 
+		final CompletableFuture<InstanceID> releasedResourceFuture = new CompletableFuture<>();
+		final ResourceActions resourceManagerActions = new TestingResourceActionsBuilder()
+			.setReleaseResourceConsumer((instanceID, e) -> releasedResourceFuture.complete(instanceID))
+			.build();
 		final ResourceManagerId resourceManagerId = ResourceManagerId.generate();
-		final ResourceActions resourceManagerActions = mock(ResourceActions.class);
 		final ScheduledExecutor scheduledExecutor = TestingUtils.defaultScheduledExecutor();
 
 		final ResourceID resourceId = ResourceID.generate();
@@ -979,14 +971,13 @@ public void testTimeoutForUnusedTaskManager() throws Exception {
 		final ResourceProfile resourceProfile = new ResourceProfile(1.0, 1);
 		final SlotRequest slotRequest = new SlotRequest(jobId, allocationId, resourceProfile, "foobar");
 
-		final TaskExecutorGateway taskExecutorGateway = mock(TaskExecutorGateway.class);
-		when(taskExecutorGateway.requestSlot(
-			any(SlotID.class),
-			eq(jobId),
-			eq(allocationId),
-			anyString(),
-			eq(resourceManagerId),
-			any(Time.class))).thenReturn(CompletableFuture.completedFuture(Acknowledge.get()));
+		final CompletableFuture<SlotID> requestedSlotFuture = new CompletableFuture<>();
+		final TaskExecutorGateway taskExecutorGateway = new TestingTaskExecutorGatewayBuilder()
+			.setRequestSlotFunction(tuple5 -> {
+				requestedSlotFuture.complete(tuple5.f0);
+				return CompletableFuture.completedFuture(Acknowledge.get());
+			})
+			.createTestingTaskExecutorGateway();
 
 		final TaskExecutorConnection taskManagerConnection = new TaskExecutorConnection(resourceId, taskExecutorGateway);
 
@@ -1015,17 +1006,9 @@ public void testTimeoutForUnusedTaskManager() throws Exception {
 					}
 				},
 				mainThreadExecutor)
-			.thenAccept((Object value) -> slotManager.registerTaskManager(taskManagerConnection, initialSlotReport));
+			.thenRun(() -> slotManager.registerTaskManager(taskManagerConnection, initialSlotReport));
 
-			ArgumentCaptor<SlotID> slotIdArgumentCaptor = ArgumentCaptor.forClass(SlotID.class);
-
-			verify(taskExecutorGateway, timeout(verifyTimeout)).requestSlot(
-				slotIdArgumentCaptor.capture(),
-				eq(jobId),
-				eq(allocationId),
-				anyString(),
-				eq(resourceManagerId),
-				any(Time.class));
+			final SlotID slotId = requestedSlotFuture.get();
 
 			CompletableFuture<Boolean> idleFuture = CompletableFuture.supplyAsync(
 				() -> slotManager.isTaskManagerIdle(taskManagerConnection.getInstanceID()),
@@ -1034,8 +1017,6 @@ public void testTimeoutForUnusedTaskManager() throws Exception {
 			// check that the TaskManager is not idle
 			assertFalse(idleFuture.get());
 
-			final SlotID slotId = slotIdArgumentCaptor.getValue();
-
 			CompletableFuture<TaskManagerSlot> slotFuture = CompletableFuture.supplyAsync(
 				() -> slotManager.getSlot(slotId),
 				mainThreadExecutor);
@@ -1052,7 +1033,7 @@ public void testTimeoutForUnusedTaskManager() throws Exception {
 
 			assertTrue(idleFuture2.get());
 
-			verify(resourceManagerActions, timeout(verifyTimeout).times(1)).releaseResource(eq(taskManagerConnection.getInstanceID()), any(Exception.class));
+			assertThat(releasedResourceFuture.get(), is(equalTo(taskManagerConnection.getInstanceID())));
 		}
 	}
 
@@ -1109,7 +1090,7 @@ public void testTaskManagerTimeoutDoesNotRemoveSlots() throws Exception {
 	@Test
 	public void testReportAllocatedSlot() throws Exception {
 		final ResourceID taskManagerId = ResourceID.generate();
-		final ResourceActions resourceActions = mock(ResourceActions.class);
+		final ResourceActions resourceActions = new TestingResourceActionsBuilder().build();
 		final TestingTaskExecutorGateway taskExecutorGateway = new TestingTaskExecutorGatewayBuilder().createTestingTaskExecutorGateway();
 		final TaskExecutorConnection taskExecutorConnection = new TaskExecutorConnection(taskManagerId, taskExecutorGateway);
 
@@ -1167,7 +1148,7 @@ public void testReportAllocatedSlot() throws Exception {
 	@Test
 	public void testSlotRequestFailure() throws Exception {
 		try (final SlotManager slotManager = createSlotManager(ResourceManagerId.generate(),
-			new TestingResourceActionsBuilder().createTestingResourceActions())) {
+			new TestingResourceActionsBuilder().build())) {
 
 			final SlotRequest slotRequest = new SlotRequest(new JobID(), new AllocationID(), ResourceProfile.UNKNOWN, "foobar");
 			slotManager.registerSlotRequest(slotRequest);
@@ -1222,7 +1203,7 @@ public void testSlotRequestFailure() throws Exception {
 	@Test
 	public void testSlotRequestRemovedIfTMReportAllocation() throws Exception {
 		try (final SlotManager slotManager = createSlotManager(ResourceManagerId.generate(),
-				new TestingResourceActionsBuilder().createTestingResourceActions())) {
+				new TestingResourceActionsBuilder().build())) {
 
 			final JobID jobID = new JobID();
 			final SlotRequest slotRequest1 = new SlotRequest(jobID, new AllocationID(), ResourceProfile.UNKNOWN, "foobar");
@@ -1293,7 +1274,7 @@ public void testNotifyFailedAllocationWhenTaskManagerTerminated() throws Excepti
 			.setNotifyAllocationFailureConsumer(
 				(Tuple3<JobID, AllocationID, Exception> failureMessage) ->
 					allocationFailures.offer(Tuple2.of(failureMessage.f0, failureMessage.f1)))
-			.createTestingResourceActions();
+			.build();
 
 		try (final SlotManager slotManager = createSlotManager(
 			ResourceManagerId.generate(),
@@ -1374,17 +1355,27 @@ public void testNotifyFailedAllocationWhenTaskManagerTerminated() throws Excepti
 
 	@Nonnull
 	private SlotReport createSlotReport(ResourceID taskExecutorResourceId, int numberSlots) {
+		return createSlotReport(taskExecutorResourceId, numberSlots, ResourceProfile.UNKNOWN);
+	}
+
+	@Nonnull
+	private SlotReport createSlotReport(ResourceID taskExecutorResourceId, int numberSlots, ResourceProfile resourceProfile) {
 		final Set<SlotStatus> slotStatusSet = new HashSet<>(numberSlots);
 		for (int i = 0; i < numberSlots; i++) {
-			slotStatusSet.add(new SlotStatus(new SlotID(taskExecutorResourceId, i), ResourceProfile.UNKNOWN));
+			slotStatusSet.add(new SlotStatus(new SlotID(taskExecutorResourceId, i), resourceProfile));
 		}
 
 		return new SlotReport(slotStatusSet);
 	}
 
 	@Nonnull
-	private SlotRequest createSlotRequest(JobID jobId1) {
-		return new SlotRequest(jobId1, new AllocationID(), ResourceProfile.UNKNOWN, "foobar1");
+	private SlotRequest createSlotRequest(JobID jobId) {
+		return createSlotRequest(jobId, ResourceProfile.UNKNOWN);
+	}
+
+	@Nonnull
+	private SlotRequest createSlotRequest(JobID jobId, ResourceProfile resourceProfile) {
+		return new SlotRequest(jobId, new AllocationID(), resourceProfile, "foobar1");
 	}
 
 	private SlotManager createSlotManager(ResourceManagerId resourceManagerId, ResourceActions resourceManagerActions) {
@@ -1398,4 +1389,171 @@ private SlotManager createSlotManager(ResourceManagerId resourceManagerId, Resou
 
 		return slotManager;
 	}
+
+	/**
+	 * Tests that we only request new resources/containers once we have assigned
+	 * all pending task manager slots.
+	 */
+	@Test
+	public void testRequestNewResources() throws Exception {
+		final int numberSlots = 2;
+		final AtomicInteger resourceRequests = new AtomicInteger(0);
+		final TestingResourceActions testingResourceActions = new TestingResourceActionsBuilder()
+			.setAllocateResourceFunction(
+				convert(ignored -> {
+					resourceRequests.incrementAndGet();
+					return numberSlots;
+				}))
+			.build();
+
+		try (final SlotManager slotManager = createSlotManager(
+			ResourceManagerId.generate(),
+			testingResourceActions)) {
+
+			final JobID jobId = new JobID();
+			assertThat(slotManager.registerSlotRequest(createSlotRequest(jobId)), is(true));
+			assertThat(resourceRequests.get(), is(1));
+
+			// the second slot request should not try to allocate a new resource because the
+			// previous resource was started with 2 slots.
+			assertThat(slotManager.registerSlotRequest(createSlotRequest(jobId)), is(true));
+			assertThat(resourceRequests.get(), is(1));
+
+			assertThat(slotManager.getNumberAssignedPendingTaskManagerSlots(), is(2));
+
+			assertThat(slotManager.registerSlotRequest(createSlotRequest(jobId)), is(true));
+			assertThat(resourceRequests.get(), is(2));
+		}
+	}
+
+	/**
+	 * Tests that a failing allocation/slot request will return the pending task manager slot.
+	 */
+	@Test
+	public void testFailingAllocationReturnsPendingTaskManagerSlot() throws Exception {
+		final int numberSlots = 2;
+		final TestingResourceActions resourceActions = new TestingResourceActionsBuilder()
+			.setAllocateResourceFunction(convert(value -> numberSlots))
+			.build();
+		try (final SlotManager slotManager = createSlotManager(ResourceManagerId.generate(), resourceActions)) {
+			final JobID jobId = new JobID();
+
+			final SlotRequest slotRequest = createSlotRequest(jobId);
+			assertThat(slotManager.registerSlotRequest(slotRequest), is(true));
+
+			assertThat(slotManager.getNumberPendingTaskManagerSlots(), is(numberSlots));
+			assertThat(slotManager.getNumberAssignedPendingTaskManagerSlots(), is(1));
+
+			slotManager.unregisterSlotRequest(slotRequest.getAllocationId());
+
+			assertThat(slotManager.getNumberPendingTaskManagerSlots(), is(numberSlots));
+			assertThat(slotManager.getNumberAssignedPendingTaskManagerSlots(), is(0));
+		}
+	}
+
+	/**
+	 * Tests the completion of pending task manager slots by registering a TaskExecutor.
+	 */
+	@Test
+	public void testPendingTaskManagerSlotCompletion() throws Exception {
+		final int numberSlots = 3;
+		final TestingResourceActions resourceActions = new TestingResourceActionsBuilder()
+			.setAllocateResourceFunction(convert(value -> numberSlots))
+			.build();
+
+		try (final SlotManager slotManager = createSlotManager(ResourceManagerId.generate(), resourceActions)) {
+			final JobID jobId = new JobID();
+			assertThat(slotManager.registerSlotRequest(createSlotRequest(jobId)), is(true));
+
+			assertThat(slotManager.getNumberPendingTaskManagerSlots(), is(numberSlots));
+			assertThat(slotManager.getNumberAssignedPendingTaskManagerSlots(), is(1));
+			assertThat(slotManager.getNumberRegisteredSlots(), is(0));
+
+			final TaskExecutorConnection taskExecutorConnection = createTaskExecutorConnection();
+			final SlotReport slotReport = createSlotReport(taskExecutorConnection.getResourceID(), numberSlots - 1);
+
+			slotManager.registerTaskManager(taskExecutorConnection, slotReport);
+
+			assertThat(slotManager.getNumberRegisteredSlots(), is(numberSlots - 1));
+			assertThat(slotManager.getNumberPendingTaskManagerSlots(), is(1));
+		}
+	}
+
+	private TaskExecutorConnection createTaskExecutorConnection() {
+		final TestingTaskExecutorGateway taskExecutorGateway = new TestingTaskExecutorGatewayBuilder().createTestingTaskExecutorGateway();
+		return new TaskExecutorConnection(ResourceID.generate(), taskExecutorGateway);
+	}
+
+	/**
+	 * Tests that a different slot can fulfill a pending slot request. If the
+	 * pending slot request has a pending task manager slot assigned, it should
+	 * be freed.
+	 */
+	@Test
+	public void testRegistrationOfDifferentSlot() throws Exception {
+		final int numberSlots = 1;
+		final TestingResourceActions resourceActions = new TestingResourceActionsBuilder()
+			.setAllocateResourceFunction(convert(value -> numberSlots))
+			.build();
+
+		try (final SlotManager slotManager = createSlotManager(ResourceManagerId.generate(), resourceActions)) {
+			final JobID jobId = new JobID();
+			final ResourceProfile requestedSlotProfile = new ResourceProfile(1.0, 1);
+
+			assertThat(slotManager.registerSlotRequest(createSlotRequest(jobId, requestedSlotProfile)), is(true));
+
+			assertThat(slotManager.getNumberPendingTaskManagerSlots(), is(numberSlots));
+
+			final int numberOfferedSlots = 1;
+			final TaskExecutorConnection taskExecutorConnection = createTaskExecutorConnection();
+			final ResourceProfile offeredSlotProfile = new ResourceProfile(2.0, 2);
+			final SlotReport slotReport = createSlotReport(taskExecutorConnection.getResourceID(), numberOfferedSlots, offeredSlotProfile);
+
+			slotManager.registerTaskManager(taskExecutorConnection, slotReport);
+
+			assertThat(slotManager.getNumberRegisteredSlots(), is(numberOfferedSlots));
+			assertThat(slotManager.getNumberPendingTaskManagerSlots(), is(numberSlots));
+			assertThat(slotManager.getNumberAssignedPendingTaskManagerSlots(), is(0));
+		}
+	}
+
+	/**
+	 * Tests that only free slots can fulfill/complete a pending task manager slot.
+	 */
+	@Test
+	public void testOnlyFreeSlotsCanFulfillPendingTaskManagerSlot() throws Exception {
+		final int numberSlots = 1;
+		final TestingResourceActions resourceActions = new TestingResourceActionsBuilder()
+			.setAllocateResourceFunction(convert(value -> numberSlots))
+			.build();
+
+		try (final SlotManager slotManager = createSlotManager(ResourceManagerId.generate(), resourceActions)) {
+			final JobID jobId = new JobID();
+			assertThat(slotManager.registerSlotRequest(createSlotRequest(jobId)), is(true));
+
+			final TaskExecutorConnection taskExecutorConnection = createTaskExecutorConnection();
+			final SlotID slotId = new SlotID(taskExecutorConnection.getResourceID(), 0);
+			final SlotStatus slotStatus = new SlotStatus(slotId, ResourceProfile.UNKNOWN, jobId, new AllocationID());
+			final SlotReport slotReport = new SlotReport(slotStatus);
+
+			slotManager.registerTaskManager(taskExecutorConnection, slotReport);
+
+			assertThat(slotManager.getNumberRegisteredSlots(), is(1));
+			assertThat(slotManager.getNumberPendingTaskManagerSlots(), is(numberSlots));
+			assertThat(slotManager.getNumberAssignedPendingTaskManagerSlots(), is(1));
+		}
+	}
+
+	private static FunctionWithException<ResourceProfile, Collection<ResourceProfile>, ResourceManagerException> convert(FunctionWithException<ResourceProfile, Integer, ResourceManagerException> function) {
+		return (ResourceProfile resourceProfile) -> {
+			final int slots = function.apply(resourceProfile);
+
+			final ArrayList<ResourceProfile> result = new ArrayList<>(slots);
+			for (int i = 0; i < slots; i++) {
+				result.add(resourceProfile);
+			}
+
+			return result;
+		};
+	}
 }
diff --git a/flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/slotmanager/SlotProtocolTest.java b/flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/slotmanager/SlotProtocolTest.java
index 8f6317c427f..66966cc3eff 100644
--- a/flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/slotmanager/SlotProtocolTest.java
+++ b/flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/slotmanager/SlotProtocolTest.java
@@ -19,7 +19,7 @@
 package org.apache.flink.runtime.resourcemanager.slotmanager;
 
 import org.apache.flink.api.common.JobID;
-import org.apache.flink.api.common.time.Time;
+import org.apache.flink.api.java.tuple.Tuple3;
 import org.apache.flink.runtime.clusterframework.types.AllocationID;
 import org.apache.flink.runtime.clusterframework.types.ResourceID;
 import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
@@ -33,13 +33,13 @@
 import org.apache.flink.runtime.taskexecutor.SlotReport;
 import org.apache.flink.runtime.taskexecutor.SlotStatus;
 import org.apache.flink.runtime.taskexecutor.TaskExecutorGateway;
+import org.apache.flink.runtime.taskexecutor.TestingTaskExecutorGatewayBuilder;
 import org.apache.flink.runtime.testingUtils.TestingUtils;
 import org.apache.flink.util.ExecutorUtils;
 import org.apache.flink.util.TestLogger;
 
 import org.junit.AfterClass;
 import org.junit.Test;
-import org.mockito.Mockito;
 
 import java.util.Collections;
 import java.util.concurrent.CompletableFuture;
@@ -47,12 +47,13 @@
 import java.util.concurrent.ScheduledThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 
-import static org.mockito.Matchers.any;
-import static org.mockito.Matchers.eq;
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.timeout;
-import static org.mockito.Mockito.verify;
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.is;
+import static org.junit.Assert.assertThat;
 
+/**
+ * Tests for the slot allocation protocol.
+ */
 public class SlotProtocolTest extends TestLogger {
 
 	private static final long timeout = 10000L;
@@ -87,7 +88,10 @@ public void testSlotsUnavailableRequest() throws Exception {
 			TestingUtils.infiniteTime(),
 			TestingUtils.infiniteTime())) {
 
-			ResourceActions resourceManagerActions = mock(ResourceActions.class);
+			final CompletableFuture<ResourceProfile> resourceProfileFuture = new CompletableFuture<>();
+			ResourceActions resourceManagerActions = new TestingResourceActionsBuilder()
+				.setAllocateResourceConsumer(resourceProfileFuture::complete)
+				.build();
 
 			slotManager.start(rmLeaderID, Executors.directExecutor(), resourceManagerActions);
 
@@ -99,14 +103,16 @@ public void testSlotsUnavailableRequest() throws Exception {
 
 			slotManager.registerSlotRequest(slotRequest);
 
-			verify(resourceManagerActions).allocateResource(eq(slotRequest.getResourceProfile()));
+			assertThat(resourceProfileFuture.get(), is(equalTo(slotRequest.getResourceProfile())));
 
 			// slot becomes available
-			TaskExecutorGateway taskExecutorGateway = mock(TaskExecutorGateway.class);
-			Mockito.when(
-				taskExecutorGateway
-					.requestSlot(any(SlotID.class), any(JobID.class), any(AllocationID.class), any(String.class), any(ResourceManagerId.class), any(Time.class)))
-				.thenReturn(mock(CompletableFuture.class));
+			final CompletableFuture<Tuple3<SlotID, JobID, AllocationID>> requestFuture = new CompletableFuture<>();
+			TaskExecutorGateway taskExecutorGateway = new TestingTaskExecutorGatewayBuilder()
+				.setRequestSlotFunction(tuple5 -> {
+					requestFuture.complete(Tuple3.of(tuple5.f0, tuple5.f1, tuple5.f2));
+					return new CompletableFuture<>();
+				})
+				.createTestingTaskExecutorGateway();
 
 			final ResourceID resourceID = ResourceID.generate();
 			final SlotID slotID = new SlotID(resourceID, 0);
@@ -119,8 +125,7 @@ public void testSlotsUnavailableRequest() throws Exception {
 			slotManager.registerTaskManager(new TaskExecutorConnection(resourceID, taskExecutorGateway), slotReport);
 
 			// 4) Slot becomes available and TaskExecutor gets a SlotRequest
-			verify(taskExecutorGateway, timeout(5000L))
-				.requestSlot(eq(slotID), eq(jobID), eq(allocationID), any(String.class), any(ResourceManagerId.class), any(Time.class));
+			assertThat(requestFuture.get(), is(equalTo(Tuple3.of(slotID, jobID, allocationID))));
 		}
 	}
 
@@ -137,11 +142,13 @@ public void testSlotAvailableRequest() throws Exception {
 
 		final ResourceManagerId rmLeaderID = ResourceManagerId.generate();
 
-		TaskExecutorGateway taskExecutorGateway = mock(TaskExecutorGateway.class);
-		Mockito.when(
-			taskExecutorGateway
-				.requestSlot(any(SlotID.class), any(JobID.class), any(AllocationID.class), any(String.class), any(ResourceManagerId.class), any(Time.class)))
-			.thenReturn(mock(CompletableFuture.class));
+		final CompletableFuture<Tuple3<SlotID, JobID, AllocationID>> requestFuture = new CompletableFuture<>();
+		TaskExecutorGateway taskExecutorGateway = new TestingTaskExecutorGatewayBuilder()
+			.setRequestSlotFunction(tuple5 -> {
+				requestFuture.complete(Tuple3.of(tuple5.f0, tuple5.f1, tuple5.f2));
+				return new CompletableFuture<>();
+			})
+			.createTestingTaskExecutorGateway();
 
 		try (SlotManager slotManager = new SlotManager(
 			scheduledExecutor,
@@ -149,7 +156,7 @@ public void testSlotAvailableRequest() throws Exception {
 			TestingUtils.infiniteTime(),
 			TestingUtils.infiniteTime())) {
 
-			ResourceActions resourceManagerActions = mock(ResourceActions.class);
+			ResourceActions resourceManagerActions = new TestingResourceActionsBuilder().build();
 
 			slotManager.start(rmLeaderID, Executors.directExecutor(), resourceManagerActions);
 
@@ -172,8 +179,7 @@ public void testSlotAvailableRequest() throws Exception {
 			slotManager.registerSlotRequest(slotRequest);
 
 			// a SlotRequest is routed to the TaskExecutor
-			verify(taskExecutorGateway, timeout(5000))
-				.requestSlot(eq(slotID), eq(jobID), eq(allocationID), any(String.class), any(ResourceManagerId.class), any(Time.class));
+			assertThat(requestFuture.get(), is(equalTo(Tuple3.of(slotID, jobID, allocationID))));
 		}
 	}
 }
diff --git a/flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/slotmanager/TestingResourceActions.java b/flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/slotmanager/TestingResourceActions.java
index 8b7c8026f92..4c6f14c1c40 100644
--- a/flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/slotmanager/TestingResourceActions.java
+++ b/flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/slotmanager/TestingResourceActions.java
@@ -23,9 +23,12 @@
 import org.apache.flink.runtime.clusterframework.types.AllocationID;
 import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
 import org.apache.flink.runtime.instance.InstanceID;
+import org.apache.flink.runtime.resourcemanager.exceptions.ResourceManagerException;
+import org.apache.flink.util.function.FunctionWithException;
 
 import javax.annotation.Nonnull;
 
+import java.util.Collection;
 import java.util.function.BiConsumer;
 import java.util.function.Consumer;
 
@@ -38,29 +41,28 @@
 	private final BiConsumer<InstanceID, Exception> releaseResourceConsumer;
 
 	@Nonnull
-	private final Consumer<ResourceProfile> allocateResourceConsumer;
+	private final FunctionWithException<ResourceProfile, Collection<ResourceProfile>, ResourceManagerException> allocateResourceFunction;
 
 	@Nonnull
 	private final Consumer<Tuple3<JobID, AllocationID, Exception>> notifyAllocationFailureConsumer;
 
 	public TestingResourceActions(
 			@Nonnull BiConsumer<InstanceID, Exception> releaseResourceConsumer,
-			@Nonnull Consumer<ResourceProfile> allocateResourceConsumer,
+			@Nonnull FunctionWithException<ResourceProfile, Collection<ResourceProfile>, ResourceManagerException> allocateResourceFunction,
 			@Nonnull Consumer<Tuple3<JobID, AllocationID, Exception>> notifyAllocationFailureConsumer) {
 		this.releaseResourceConsumer = releaseResourceConsumer;
-		this.allocateResourceConsumer = allocateResourceConsumer;
+		this.allocateResourceFunction = allocateResourceFunction;
 		this.notifyAllocationFailureConsumer = notifyAllocationFailureConsumer;
 	}
 
-
 	@Override
 	public void releaseResource(InstanceID instanceId, Exception cause) {
 		releaseResourceConsumer.accept(instanceId, cause);
 	}
 
 	@Override
-	public void allocateResource(ResourceProfile resourceProfile) {
-		allocateResourceConsumer.accept(resourceProfile);
+	public Collection<ResourceProfile> allocateResource(ResourceProfile resourceProfile) throws ResourceManagerException {
+		return allocateResourceFunction.apply(resourceProfile);
 	}
 
 	@Override
diff --git a/flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/slotmanager/TestingResourceActionsBuilder.java b/flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/slotmanager/TestingResourceActionsBuilder.java
index 2c1d47e8c88..ac7afd4283e 100644
--- a/flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/slotmanager/TestingResourceActionsBuilder.java
+++ b/flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/slotmanager/TestingResourceActionsBuilder.java
@@ -23,7 +23,11 @@
 import org.apache.flink.runtime.clusterframework.types.AllocationID;
 import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
 import org.apache.flink.runtime.instance.InstanceID;
+import org.apache.flink.runtime.resourcemanager.exceptions.ResourceManagerException;
+import org.apache.flink.util.function.FunctionWithException;
 
+import java.util.Collection;
+import java.util.Collections;
 import java.util.function.BiConsumer;
 import java.util.function.Consumer;
 
@@ -32,7 +36,7 @@
  */
 public class TestingResourceActionsBuilder {
 	private BiConsumer<InstanceID, Exception> releaseResourceConsumer = (ignoredA, ignoredB) -> {};
-	private Consumer<ResourceProfile> allocateResourceConsumer = (ignored) -> {};
+	private FunctionWithException<ResourceProfile, Collection<ResourceProfile>, ResourceManagerException> allocateResourceFunction = (ignored) -> Collections.singleton(ResourceProfile.UNKNOWN);
 	private Consumer<Tuple3<JobID, AllocationID, Exception>> notifyAllocationFailureConsumer = (ignored) -> {};
 
 	public TestingResourceActionsBuilder setReleaseResourceConsumer(BiConsumer<InstanceID, Exception> releaseResourceConsumer) {
@@ -40,8 +44,16 @@ public TestingResourceActionsBuilder setReleaseResourceConsumer(BiConsumer<Insta
 		return this;
 	}
 
+	public TestingResourceActionsBuilder setAllocateResourceFunction(FunctionWithException<ResourceProfile, Collection<ResourceProfile>, ResourceManagerException> allocateResourceFunction) {
+		this.allocateResourceFunction = allocateResourceFunction;
+		return this;
+	}
+
 	public TestingResourceActionsBuilder setAllocateResourceConsumer(Consumer<ResourceProfile> allocateResourceConsumer) {
-		this.allocateResourceConsumer = allocateResourceConsumer;
+		this.allocateResourceFunction = (ResourceProfile resourceProfile) -> {
+			allocateResourceConsumer.accept(resourceProfile);
+			return Collections.singleton(ResourceProfile.UNKNOWN);
+		};
 		return this;
 	}
 
@@ -50,7 +62,7 @@ public TestingResourceActionsBuilder setNotifyAllocationFailureConsumer(Consumer
 		return this;
 	}
 
-	public TestingResourceActions createTestingResourceActions() {
-		return new TestingResourceActions(releaseResourceConsumer, allocateResourceConsumer, notifyAllocationFailureConsumer);
+	public TestingResourceActions build() {
+		return new TestingResourceActions(releaseResourceConsumer, allocateResourceFunction, notifyAllocationFailureConsumer);
 	}
 }
diff --git a/flink-yarn/src/main/java/org/apache/flink/yarn/YarnResourceManager.java b/flink-yarn/src/main/java/org/apache/flink/yarn/YarnResourceManager.java
index 956e40fe61b..2a43b8b7f1a 100644
--- a/flink-yarn/src/main/java/org/apache/flink/yarn/YarnResourceManager.java
+++ b/flink-yarn/src/main/java/org/apache/flink/yarn/YarnResourceManager.java
@@ -58,6 +58,7 @@
 
 import javax.annotation.Nullable;
 
+import java.util.Collection;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -115,6 +116,8 @@
 
 	private final Map<ResourceProfile, Integer> resourcePriorities = new HashMap<>();
 
+	private final Collection<ResourceProfile> slotsPerWorker;
+
 	public YarnResourceManager(
 			RpcService rpcService,
 			String resourceManagerEndpointId,
@@ -163,6 +166,8 @@ public YarnResourceManager(
 		this.numberOfTaskSlots = flinkConfig.getInteger(TaskManagerOptions.NUM_TASK_SLOTS);
 		this.defaultTaskManagerMemoryMB = ConfigurationUtils.getTaskManagerHeapMemory(flinkConfig).getMebiBytes();
 		this.defaultCpus = flinkConfig.getInteger(YarnConfigOptions.VCORES, numberOfTaskSlots);
+
+		this.slotsPerWorker = createSlotsPerWorker(numberOfTaskSlots);
 	}
 
 	protected AMRMClientAsync<AMRMClient.ContainerRequest> createAndStartResourceManagerClient(
@@ -283,7 +288,7 @@ protected void internalDeregisterApplication(
 	}
 
 	@Override
-	public void startNewWorker(ResourceProfile resourceProfile) {
+	public Collection<ResourceProfile> startNewWorker(ResourceProfile resourceProfile) {
 		// Priority for worker containers - priorities are intra-application
 		//TODO: set priority according to the resource allocated
 		Priority priority = Priority.newInstance(generatePriority(resourceProfile));
@@ -291,6 +296,8 @@ public void startNewWorker(ResourceProfile resourceProfile) {
 		int vcore = resourceProfile.getCpuCores() < 1 ? defaultCpus : (int) resourceProfile.getCpuCores();
 		Resource capability = Resource.newInstance(mem, vcore);
 		requestYarnContainer(capability, priority);
+
+		return slotsPerWorker;
 	}
 
 	@Override
@@ -334,7 +341,7 @@ public void onContainersCompleted(final List<ContainerStatus> statuses) {
 					if (yarnWorkerNode != null) {
 						// Container completed unexpectedly ~> start a new one
 						final Container container = yarnWorkerNode.getContainer();
-						requestYarnContainer(container.getResource(), yarnWorkerNode.getContainer().getPriority());
+						requestYarnContainerIfRequired(container.getResource(), yarnWorkerNode.getContainer().getPriority());
 					}
 					// Eagerly close the connection with task manager.
 					closeTaskManagerConnection(resourceId, new Exception(containerStatus.getDiagnostics()));
@@ -375,7 +382,7 @@ public void onContainersAllocated(List<Container> containers) {
 						workerNodeMap.remove(resourceId);
 						resourceManagerClient.releaseAssignedContainer(container.getId());
 						// and ask for a new one
-						requestYarnContainer(container.getResource(), container.getPriority());
+						requestYarnContainerIfRequired(container.getResource(), container.getPriority());
 					}
 				} else {
 					// return the excessive containers
@@ -446,21 +453,26 @@ private FinalApplicationStatus getYarnStatus(ApplicationStatus status) {
 	/**
 	 * Request new container if pending containers cannot satisfies pending slot requests.
 	 */
+	private void requestYarnContainerIfRequired(Resource resource, Priority priority) {
+		int requiredTaskManagerSlots = getNumberRequiredTaskManagerSlots();
+		int pendingTaskManagerSlots = numPendingContainerRequests * numberOfTaskSlots;
+
+		if (requiredTaskManagerSlots > pendingTaskManagerSlots) {
+			requestYarnContainer(resource, priority);
+		}
+	}
+
 	private void requestYarnContainer(Resource resource, Priority priority) {
-		int pendingSlotRequests = getNumberPendingSlotRequests();
-		int pendingSlotAllocation = numPendingContainerRequests * numberOfTaskSlots;
-		if (pendingSlotRequests > pendingSlotAllocation) {
-			resourceManagerClient.addContainerRequest(new AMRMClient.ContainerRequest(resource, null, null, priority));
+		resourceManagerClient.addContainerRequest(new AMRMClient.ContainerRequest(resource, null, null, priority));
 
-			// make sure we transmit the request fast and receive fast news of granted allocations
-			resourceManagerClient.setHeartbeatInterval(FAST_YARN_HEARTBEAT_INTERVAL_MS);
+		// make sure we transmit the request fast and receive fast news of granted allocations
+		resourceManagerClient.setHeartbeatInterval(FAST_YARN_HEARTBEAT_INTERVAL_MS);
 
-			numPendingContainerRequests++;
+		numPendingContainerRequests++;
 
-			log.info("Requesting new TaskExecutor container with resources {}. Number pending requests {}.",
-				resource,
-				numPendingContainerRequests);
-		}
+		log.info("Requesting new TaskExecutor container with resources {}. Number pending requests {}.",
+			resource,
+			numPendingContainerRequests);
 	}
 
 	private ContainerLaunchContext createTaskExecutorLaunchContext(Resource resource, String containerId, String host)


 

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