| /* |
| * 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.samza.clustermanager.container.placement; |
| |
| import com.google.common.base.Preconditions; |
| import org.apache.samza.clustermanager.ContainerProcessManager; |
| import org.apache.samza.config.ApplicationConfig; |
| import org.apache.samza.container.placement.ContainerPlacementRequestMessage; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Stateless handler that periodically dispatches {@link ContainerPlacementRequestMessage} read from Metadata store to Job Coordinator |
| * Container placement requests from the previous deployment are deleted from the metadata store, ContainerPlacementRequestAllocatorThread |
| * does this cleanup |
| */ |
| public class ContainerPlacementRequestAllocator implements Runnable { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(ContainerPlacementRequestAllocator.class); |
| private static final int DEFAULT_CLUSTER_MANAGER_CONTAINER_PLACEMENT_HANDLER_SLEEP_MS = 5000; |
| |
| /** |
| * {@link ContainerProcessManager} needs to intercept container placement actions between ContainerPlacementRequestAllocator and |
| * {@link org.apache.samza.clustermanager.ContainerManager} to avoid cyclic dependency between |
| * {@link org.apache.samza.clustermanager.ContainerManager} and {@link org.apache.samza.clustermanager.ContainerAllocator} |
| */ |
| private final ContainerProcessManager containerProcessManager; |
| private final ContainerPlacementMetadataStore containerPlacementMetadataStore; |
| /** |
| * State that controls the lifecycle of the ContainerPlacementRequestAllocator thread |
| */ |
| private volatile boolean isRunning; |
| /** |
| * RunId of the app |
| */ |
| private final String appRunId; |
| |
| public ContainerPlacementRequestAllocator(ContainerPlacementMetadataStore containerPlacementMetadataStore, ContainerProcessManager manager, ApplicationConfig config) { |
| Preconditions.checkNotNull(containerPlacementMetadataStore, "containerPlacementMetadataStore cannot be null"); |
| Preconditions.checkNotNull(manager, "ContainerProcessManager cannot be null"); |
| this.containerProcessManager = manager; |
| this.containerPlacementMetadataStore = containerPlacementMetadataStore; |
| this.isRunning = true; |
| this.appRunId = config.getRunId(); |
| } |
| |
| @Override |
| public void run() { |
| while (isRunning && containerPlacementMetadataStore.isRunning()) { |
| try { |
| for (ContainerPlacementRequestMessage message : containerPlacementMetadataStore.readAllContainerPlacementRequestMessages()) { |
| // We do not need to dispatch ContainerPlacementResponseMessage because they are written from JobCoordinator |
| // in response to a Container Placement Action |
| if (message.getDeploymentId().equals(appRunId)) { |
| LOG.debug("Received a container placement message {}", message); |
| containerProcessManager.registerContainerPlacementAction(message); |
| } else { |
| // Delete the ContainerPlacementMessages from the previous deployment |
| containerPlacementMetadataStore.deleteAllContainerPlacementMessages(message.getUuid()); |
| } |
| } |
| Thread.sleep(DEFAULT_CLUSTER_MANAGER_CONTAINER_PLACEMENT_HANDLER_SLEEP_MS); |
| } catch (InterruptedException e) { |
| LOG.warn("Got InterruptedException in ContainerPlacementRequestAllocator thread.", e); |
| Thread.currentThread().interrupt(); |
| } catch (Exception e) { |
| LOG.error( |
| "Got an exception while reading ContainerPlacementRequestMessage in ContainerPlacementRequestAllocator thread", |
| e); |
| } |
| } |
| } |
| |
| public void stop() { |
| if (isRunning) { |
| isRunning = false; |
| } else { |
| LOG.warn("ContainerPlacementRequestAllocator already stopped"); |
| } |
| } |
| } |