xinyuiscool commented on a change in pull request #1197: SAMZA-2067: Support Samza's running on Kubernetes URL: https://github.com/apache/samza/pull/1197#discussion_r347052379
########## File path: samza-kubernetes/src/main/java/org/apache/samza/job/kubernetes/KubeClusterResourceManager.java ########## @@ -0,0 +1,298 @@ +/* + * 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.job.kubernetes; + +import io.fabric8.kubernetes.api.model.*; +import io.fabric8.kubernetes.client.KubernetesClient; +import io.fabric8.kubernetes.client.KubernetesClientException; +import io.fabric8.kubernetes.client.Watcher; +import java.net.URL; +import java.util.*; +import org.apache.samza.clustermanager.ClusterResourceManager; +import org.apache.samza.clustermanager.ResourceRequestState; +import org.apache.samza.clustermanager.SamzaApplicationState; +import org.apache.samza.clustermanager.SamzaResourceRequest; +import org.apache.samza.clustermanager.SamzaResource; +import org.apache.samza.config.ClusterManagerConfig; +import org.apache.samza.config.Config; +import org.apache.samza.config.TaskConfig; +import org.apache.samza.coordinator.JobModelManager; +import org.apache.samza.coordinator.stream.messages.SetContainerHostMapping; +import org.apache.samza.job.CommandBuilder; +import org.apache.samza.job.ShellCommandBuilder; +import org.apache.samza.util.Util; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import static org.apache.samza.config.ApplicationConfig.*; +import static org.apache.samza.config.KubeConfig.*; + +/** + * An {@link KubeClusterResourceManager} implements a ClusterResourceManager using Kubernetes as the underlying + * resource manager. + */ +public class KubeClusterResourceManager extends ClusterResourceManager { + private static final Logger LOG = LoggerFactory.getLogger(KubeClusterResourceManager.class); + private final Map<String, String> podLabels = new HashMap<>(); + private KubernetesClient client; + private String appId; + private String appName; + private String image; + private String namespace; + private OwnerReference ownerReference; + private JobModelManager jobModelManager; + private boolean hostAffinityEnabled; + private Config config; + private String jcPodName; + + KubeClusterResourceManager(Config config, JobModelManager jobModelManager, ClusterResourceManager.Callback callback) { + super(callback); + this.config = config; + this.client = KubeClientFactory.create(); + this.jobModelManager = jobModelManager; + this.image = config.get(APP_IMAGE, DEFAULT_IMAGE); + this.namespace = config.get(K8S_API_NAMESPACE, "default"); + this.appId = config.get(APP_ID, "001"); + this.appName = config.get(APP_NAME, "samza"); + ClusterManagerConfig clusterManagerConfig = new ClusterManagerConfig(config); + this.hostAffinityEnabled = clusterManagerConfig.getHostAffinityEnabled(); + createOwnerReferences(); + } + + @Override + public void start() { + LOG.info("Kubernetes Cluster ResourceManager started, starting watcher"); + startPodWatcher(); + jobModelManager.start(); + } + + // Create the owner reference for the samza-job-coordinator pod + private void createOwnerReferences() { + this.jcPodName = System.getenv(COORDINATOR_POD_NAME); + LOG.info("job coordinator pod name is: {}, namespace is: {}", jcPodName, namespace); + Pod pod = client.pods().inNamespace(namespace).withName(jcPodName).get(); + ownerReference = new OwnerReferenceBuilder() + .withName(pod.getMetadata().getName()) + .withApiVersion(pod.getApiVersion()) + .withUid(pod.getMetadata().getUid()) + .withKind(pod.getKind()) + .withController(true).build(); + podLabels.put("jc-pod-name", jcPodName); + } + + public void startPodWatcher() { + Watcher watcher = new Watcher<Pod>() { + @Override + public void eventReceived(Action action, Pod pod) { + if (!pod.getMetadata().getLabels().get("jc-pod-name").equals(jcPodName)) { + LOG.warn("This JC pod name is " + jcPodName + ", received pods for a different JC " + + pod.getMetadata().getLabels().get("jc-pod-name")); + return; + } + LOG.info("Pod watcher received action " + action + " for pod " + pod.getMetadata().getName()); + switch (action) { + case ADDED: + LOG.info("Pod " + pod.getMetadata().getName() + " is added."); + break; + case MODIFIED: + LOG.info("Pod " + pod.getMetadata().getName() + " is modified."); + if (isPodFailed(pod)) { + deletePod(pod); + } + break; + case ERROR: + LOG.info("Pod " + pod.getMetadata().getName() + " received error."); + if (isPodFailed(pod)) { + deletePod(pod); + } + break; + case DELETED: + LOG.info("Pod " + pod.getMetadata().getName() + " is deleted."); + createNewStreamProcessor(pod); + break; + } + } + @Override + public void onClose(KubernetesClientException e) { + LOG.error("Pod watcher closed", e); + } + }; + + // TODO: SAMZA-2367: "podLabels" is empty. Need to add labels when creating Pod + client.pods().withLabels(podLabels).watch(watcher); + } + + private boolean isPodFailed(Pod pod) { + return pod.getStatus() != null && pod.getStatus().getPhase().equals("Failed"); + } + + private void deletePod(Pod pod) { + boolean deleted = client.pods().delete(pod); + if (deleted) { + LOG.info("Deleted pod " + pod.getMetadata().getName()); + } else { + LOG.info("Failed to deleted pod " + pod.getMetadata().getName()); + } + } + private void createNewStreamProcessor(Pod pod) { + int memory = Integer.parseInt(pod.getSpec().getContainers().get(0).getResources().getRequests().get("memory").getAmount()); + int cpu = Integer.parseInt(pod.getSpec().getContainers().get(0).getResources().getRequests().get("cpu").getAmount()); + + String containerId = KubeUtils.getSamzaContainerNameFromPodName(pod.getMetadata().getName()); + + // Find out previously running container location + String lastSeenOn = jobModelManager.jobModel().getContainerToHostValue(containerId, SetContainerHostMapping.HOST_KEY); + if (!hostAffinityEnabled || lastSeenOn == null) { + lastSeenOn = ResourceRequestState.ANY_HOST; + } + SamzaResourceRequest request = new SamzaResourceRequest(cpu, memory, lastSeenOn, containerId); + requestResources(request); + } + + @Override + public void requestResources(SamzaResourceRequest resourceRequest) { + String samzaContainerId = resourceRequest.getProcessorId(); + LOG.info("Requesting resources on " + resourceRequest.getPreferredHost() + " for container " + samzaContainerId); + CommandBuilder builder = getCommandBuilder(samzaContainerId); + String command = buildCmd(builder); + LOG.info("Container ID {} using command {}", samzaContainerId, command); + Container container = KubeUtils.createContainer(STREAM_PROCESSOR_CONTAINER_NAME_PREFIX, image, resourceRequest, command); + container.setEnv(getEnvs(builder)); + String podName = String.format(TASK_POD_NAME_FORMAT, STREAM_PROCESSOR_CONTAINER_NAME_PREFIX, appName, appId, samzaContainerId); + + PodBuilder podBuilder; + if (config.getBoolean(AZURE_REMOTE_VOLUME_ENABLED)) { + AzureFileVolumeSource azureFileVolumeSource = new AzureFileVolumeSource(false, + config.get(AZURE_SECRET, DEFAULT_AZURE_SECRET), config.get(AZURE_FILESHARE, DEFAULT_AZURE_FILESHARE)); + Volume volume = new Volume(); + volume.setAzureFile(azureFileVolumeSource); + volume.setName("azure"); + VolumeMount volumeMount = new VolumeMount(); + volumeMount.setMountPath(config.get(SAMZA_MOUNT_DIR, DEFAULT_SAMZA_MOUNT_DIR)); + volumeMount.setName("azure"); + volumeMount.setSubPath(podName); + LOG.info("Set subpath to " + podName + ", mountpath to " + config.get(SAMZA_MOUNT_DIR, DEFAULT_SAMZA_MOUNT_DIR)); + container.setVolumeMounts(Collections.singletonList(volumeMount)); + podBuilder = new PodBuilder().editOrNewMetadata() + .withName(podName) + .withOwnerReferences(ownerReference) + .addToLabels(podLabels).endMetadata() + .editOrNewSpec() + .withRestartPolicy(POD_RESTART_POLICY) + .withVolumes(volume).addToContainers(container).endSpec(); + } else { + podBuilder = new PodBuilder().editOrNewMetadata() + .withName(podName) + .withOwnerReferences(ownerReference) + .addToLabels(podLabels).endMetadata() + .editOrNewSpec() + .withRestartPolicy(POD_RESTART_POLICY) + .addToContainers(container).endSpec(); + } + + String preferredHost = resourceRequest.getPreferredHost(); + Pod pod; + if (preferredHost.equals("ANY_HOST")) { + // Create a pod with only one container in anywhere + pod = podBuilder.build(); + } else { + LOG.info("Making a preferred host request on " + preferredHost); + pod = podBuilder.editOrNewSpec().editOrNewAffinity().editOrNewNodeAffinity() + .addNewPreferredDuringSchedulingIgnoredDuringExecution().withNewPreference() + .addNewMatchExpression() + .withKey("kubernetes.io/hostname") + .withOperator("Equal") + .withValues(preferredHost).endMatchExpression() + .endPreference().endPreferredDuringSchedulingIgnoredDuringExecution().endNodeAffinity().endAffinity().endSpec().build(); + } + client.pods().inNamespace(namespace).create(pod); + LOG.info("Created a pod " + pod.getMetadata().getName() + " on " + preferredHost); + } + + @Override + public void cancelResourceRequest(SamzaResourceRequest request) { + // no need to implement + } + + @Override + public void releaseResources(SamzaResource resource) { + // no need to implement + } + + @Override + public void launchStreamProcessor(SamzaResource resource, CommandBuilder builder) { + // no need to implement + } + + @Override + public void stopStreamProcessor(SamzaResource resource) { + client.pods().withName(resource.getContainerId()).delete(); + } + + @Override + public void stop(SamzaApplicationState.SamzaAppStatus status) { + LOG.info("Kubernetes Cluster ResourceManager stopped"); + jobModelManager.stop(); + } + + private String buildCmd(CommandBuilder cmdBuilder) { + cmdBuilder.setCommandPath(DEFAULT_DIRECTORY); + return cmdBuilder.buildCommand(); + } + + private CommandBuilder getCommandBuilder(String containerId) { + TaskConfig taskConfig = new TaskConfig(config); + String cmdBuilderClassName = taskConfig.getCommandClass(ShellCommandBuilder.class.getName()); + CommandBuilder cmdBuilder = Util.getObj(cmdBuilderClassName, CommandBuilder.class); + if (jobModelManager.server() == null) { + LOG.error("HttpServer is null"); + } + URL url = jobModelManager.server().getIpUrl(); + LOG.info("HttpServer URL: " + url); + cmdBuilder.setConfig(config).setId(containerId).setUrl(url); + + return cmdBuilder; + } + + // Construct the envs for the task container pod + private List<EnvVar> getEnvs(CommandBuilder cmdBuilder) { Review comment: Can we make it an static util method? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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