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* 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.api.common.JobID;
import org.apache.flink.runtime.clusterframework.types.AllocationID;
import org.apache.flink.runtime.clusterframework.types.ResourceID;
import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
import org.apache.flink.runtime.clusterframework.types.SlotID;
import org.apache.flink.runtime.instance.InstanceID;
import org.apache.flink.runtime.messages.Acknowledge;
import org.apache.flink.runtime.resourcemanager.ResourceManagerId;
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.exceptions.SlotOccupiedException;
import org.apache.flink.util.Preconditions;
import org.apache.flink.util.concurrent.FutureUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Nullable;
import java.time.Duration;
import java.util.HashSet;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Executor;
/** Default implementation of {@link SlotStatusSyncer} for fine-grained slot management. */
public class DefaultSlotStatusSyncer implements SlotStatusSyncer {
private static final Logger LOG = LoggerFactory.getLogger(DefaultSlotStatusSyncer.class);
private final Set pendingSlotAllocations = new HashSet<>();
/** Timeout for slot requests to the task manager. */
private final Duration taskManagerRequestTimeout;
@Nullable private TaskManagerTracker taskManagerTracker;
@Nullable private ResourceTracker resourceTracker;
@Nullable private Executor mainThreadExecutor;
@Nullable private ResourceManagerId resourceManagerId;
private boolean started = false;
public DefaultSlotStatusSyncer(Duration taskManagerRequestTimeout) {
this.taskManagerRequestTimeout = Preconditions.checkNotNull(taskManagerRequestTimeout);
}
@Override
public void initialize(
TaskManagerTracker taskManagerTracker,
ResourceTracker resourceTracker,
ResourceManagerId resourceManagerId,
Executor mainThreadExecutor) {
this.taskManagerTracker = Preconditions.checkNotNull(taskManagerTracker);
this.resourceTracker = Preconditions.checkNotNull(resourceTracker);
this.mainThreadExecutor = Preconditions.checkNotNull(mainThreadExecutor);
this.resourceManagerId = Preconditions.checkNotNull(resourceManagerId);
this.pendingSlotAllocations.clear();
started = true;
}
@Override
public void close() {
this.taskManagerTracker = null;
this.resourceTracker = null;
this.mainThreadExecutor = null;
this.resourceManagerId = null;
this.pendingSlotAllocations.clear();
started = false;
}
@Override
public CompletableFuture allocateSlot(
InstanceID instanceId,
JobID jobId,
String targetAddress,
ResourceProfile resourceProfile) {
Preconditions.checkNotNull(instanceId);
Preconditions.checkNotNull(jobId);
Preconditions.checkNotNull(targetAddress);
Preconditions.checkNotNull(resourceProfile);
checkStarted();
final AllocationID allocationId = new AllocationID();
final Optional taskManager =
taskManagerTracker.getRegisteredTaskManager(instanceId);
Preconditions.checkState(
taskManager.isPresent(),
"Could not find a registered task manager for instance id " + instanceId + '.');
final TaskExecutorGateway gateway =
taskManager.get().getTaskExecutorConnection().getTaskExecutorGateway();
final ResourceID resourceId = taskManager.get().getTaskExecutorConnection().getResourceID();
LOG.info(
"Starting allocation of slot {} from {} for job {} with resource profile {}.",
allocationId,
resourceId,
jobId,
resourceProfile);
taskManagerTracker.notifySlotStatus(
allocationId, jobId, instanceId, resourceProfile, SlotState.PENDING);
resourceTracker.notifyAcquiredResource(jobId, resourceProfile);
pendingSlotAllocations.add(allocationId);
// RPC call to the task manager
CompletableFuture requestFuture =
gateway.requestSlot(
SlotID.getDynamicSlotID(resourceId),
jobId,
allocationId,
resourceProfile,
targetAddress,
resourceManagerId,
taskManagerRequestTimeout);
CompletableFuture returnedFuture = new CompletableFuture<>();
FutureUtils.assertNoException(
requestFuture.handleAsync(
(Acknowledge acknowledge, Throwable throwable) -> {
if (!pendingSlotAllocations.remove(allocationId)) {
LOG.debug(
"Ignoring slot allocation update from task manager {} for allocation {} and job {}, because the allocation was already completed or cancelled.",
instanceId,
allocationId,
jobId);
returnedFuture.complete(null);
return null;
}
if (!taskManagerTracker
.getAllocatedOrPendingSlot(allocationId)
.isPresent()) {
LOG.debug(
"The slot {} has been removed before. Ignore the future.",
allocationId);
returnedFuture.complete(null);
return null;
}
if (acknowledge != null) {
LOG.trace(
"Completed allocation of allocation {} for job {}.",
allocationId,
jobId);
taskManagerTracker.notifySlotStatus(
allocationId,
jobId,
instanceId,
resourceProfile,
SlotState.ALLOCATED);
returnedFuture.complete(null);
} else {
if (throwable instanceof SlotOccupiedException) {
LOG.error("Should not get this exception.", throwable);
} else {
// TODO If the taskManager does not have enough resource, we
// may endlessly allocate slot on it until the next heartbeat.
LOG.warn(
"Slot allocation for allocation {} for job {} failed.",
allocationId,
jobId,
throwable);
resourceTracker.notifyLostResource(jobId, resourceProfile);
taskManagerTracker.notifySlotStatus(
allocationId,
jobId,
instanceId,
resourceProfile,
SlotState.FREE);
}
returnedFuture.completeExceptionally(throwable);
}
return null;
},
mainThreadExecutor));
return returnedFuture;
}
@Override
public void freeSlot(AllocationID allocationId) {
Preconditions.checkNotNull(allocationId);
checkStarted();
LOG.info("Freeing slot {}.", allocationId);
final Optional slotOptional =
taskManagerTracker.getAllocatedOrPendingSlot(allocationId);
if (!slotOptional.isPresent()) {
LOG.warn("Try to free unknown slot {}.", allocationId);
return;
}
final TaskManagerSlotInformation slot = slotOptional.get();
if (slot.getState() == SlotState.PENDING) {
pendingSlotAllocations.remove(allocationId);
}
resourceTracker.notifyLostResource(slot.getJobId(), slot.getResourceProfile());
taskManagerTracker.notifySlotStatus(
allocationId,
slot.getJobId(),
slot.getInstanceId(),
slot.getResourceProfile(),
SlotState.FREE);
}
@Override
public boolean reportSlotStatus(InstanceID instanceId, SlotReport slotReport) {
Preconditions.checkNotNull(slotReport);
Preconditions.checkNotNull(instanceId);
checkStarted();
final Optional taskManager =
taskManagerTracker.getRegisteredTaskManager(instanceId);
if (!taskManager.isPresent()) {
LOG.debug(
"Received slot report for unknown task manager with instance id {}. Ignoring this report.",
instanceId);
return false;
}
LOG.debug("Received slot report from instance {}: {}.", instanceId, slotReport);
boolean canApplyPreviousAllocations = true;
final Set reportedAllocationIds = new HashSet<>();
slotReport
.iterator()
.forEachRemaining(
slotStatus -> reportedAllocationIds.add(slotStatus.getAllocationID()));
for (TaskManagerSlotInformation slot :
new HashSet<>(taskManager.get().getAllocatedSlots().values())) {
// Only free the slot which is previously allocated. For pending slot, we might wait for
// the next slot report or the acknowledgement of the allocation request.
if (!reportedAllocationIds.contains(slot.getAllocationId())
&& slot.getState() == SlotState.ALLOCATED) {
LOG.info("Freeing slot {} by slot report.", slot.getAllocationId());
taskManagerTracker.notifySlotStatus(
slot.getAllocationId(),
slot.getJobId(),
slot.getInstanceId(),
slot.getResourceProfile(),
SlotState.FREE);
resourceTracker.notifyLostResource(slot.getJobId(), slot.getResourceProfile());
canApplyPreviousAllocations = false;
}
}
for (SlotStatus slotStatus : slotReport) {
if (slotStatus.getAllocationID() == null) {
continue;
}
if (!syncAllocatedSlotStatus(slotStatus, taskManager.get())) {
canApplyPreviousAllocations = false;
}
}
return canApplyPreviousAllocations;
}
private boolean syncAllocatedSlotStatus(SlotStatus slotStatus, TaskManagerInfo taskManager) {
final AllocationID allocationId = Preconditions.checkNotNull(slotStatus.getAllocationID());
final JobID jobId = Preconditions.checkNotNull(slotStatus.getJobID());
final ResourceProfile resourceProfile =
Preconditions.checkNotNull(slotStatus.getResourceProfile());
if (taskManager.getAllocatedSlots().containsKey(allocationId)) {
if (taskManager.getAllocatedSlots().get(allocationId).getState() == SlotState.PENDING) {
// Allocation Complete
final TaskManagerSlotInformation slot =
taskManager.getAllocatedSlots().get(allocationId);
pendingSlotAllocations.remove(slot.getAllocationId());
taskManagerTracker.notifySlotStatus(
slot.getAllocationId(),
slot.getJobId(),
slot.getInstanceId(),
slot.getResourceProfile(),
SlotState.ALLOCATED);
}
return true;
} else {
Preconditions.checkState(
!taskManagerTracker.getAllocatedOrPendingSlot(allocationId).isPresent(),
"Duplicated allocation for " + allocationId);
taskManagerTracker.notifySlotStatus(
allocationId,
jobId,
taskManager.getInstanceId(),
resourceProfile,
SlotState.ALLOCATED);
resourceTracker.notifyAcquiredResource(jobId, resourceProfile);
return false;
}
}
@Override
public void freeInactiveSlots(JobID jobId) {
checkStarted();
for (TaskManagerInfo taskManagerInfo :
taskManagerTracker.getTaskManagersWithAllocatedSlotsForJob(jobId)) {
taskManagerInfo
.getTaskExecutorConnection()
.getTaskExecutorGateway()
.freeInactiveSlots(jobId, taskManagerRequestTimeout);
}
}
private void checkStarted() {
Preconditions.checkState(started);
Preconditions.checkNotNull(taskManagerTracker);
Preconditions.checkNotNull(resourceTracker);
Preconditions.checkNotNull(mainThreadExecutor);
Preconditions.checkNotNull(resourceManagerId);
}
}
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