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_r347046725
########## File path: samza-kubernetes/src/main/java/org/apache/samza/job/kubernetes/KubeJob.java ########## @@ -0,0 +1,244 @@ +/* + * 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 org.apache.samza.SamzaException; +import org.apache.samza.clustermanager.ResourceRequestState; +import org.apache.samza.clustermanager.SamzaResourceRequest; +import org.apache.samza.config.Config; +import org.apache.samza.config.MapConfig; +import org.apache.samza.job.ApplicationStatus; +import org.apache.samza.job.StreamJob; +import org.apache.samza.util.CoordinatorStreamUtil; +import org.apache.samza.util.Util; +import org.codehaus.jackson.map.ObjectMapper; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; +import scala.collection.mutable.StringBuilder; + +import java.io.IOException; +import java.util.ArrayList; +import java.util.Collections; +import java.util.List; +import java.util.concurrent.TimeUnit; + +import static org.apache.samza.config.ApplicationConfig.APP_ID; +import static org.apache.samza.config.ApplicationConfig.APP_NAME; +import static org.apache.samza.config.KubeConfig.*; +import static org.apache.samza.job.ApplicationStatus.*; +import static org.apache.samza.serializers.model.SamzaObjectMapper.getObjectMapper; + +/** + * The client to start a Kubernetes job coordinator + */ +public class KubeJob implements StreamJob { + private static final Logger LOG = LoggerFactory.getLogger(KubeJob.class); + private Config config; + private KubernetesClient kubernetesClient; + private String podName; + private ApplicationStatus currentStatus; + private String nameSpace; + private KubePodStatusWatcher watcher; + private String image; + + public KubeJob(Config config) { + this.kubernetesClient = KubeClientFactory.create(); + this.config = config; + this.podName = String.format(JC_POD_NAME_FORMAT, JC_CONTAINER_NAME_PREFIX, + config.get(APP_NAME, "samza"), config.get(APP_ID, "1")); + this.currentStatus = ApplicationStatus.New; + this.watcher = new KubePodStatusWatcher(podName); + this.nameSpace = config.get(K8S_API_NAMESPACE, "default"); + this.image = config.get(APP_IMAGE, DEFAULT_IMAGE); + } + + /** + * submit the kubernetes job coordinator + */ + public KubeJob submit() { + // create SamzaResourceRequest + int memoryMB = config.getInt(CLUSTER_MANAGER_CONTAINER_MEM_SIZE, DEFAULT_CLUSTER_MANAGER_CONTAINER_MEM_SIZE); + int numCores = config.getInt(CLUSTER_MANAGER_CONTAINER_CPU_CORE_NUM, DEFAULT_CLUSTER_MANAGER_CONTAINER_CPU_CORE_NUM); + String preferredHost = ResourceRequestState.ANY_HOST; + SamzaResourceRequest request = new SamzaResourceRequest(numCores, memoryMB, preferredHost, podName); + + // create Container + // TODO: SAMZA-2368: Figure out "samza.fwk.path" and "samza.fwk.version" are still needed in Samza 1.3 + String fwkPath = config.get("samza.fwk.path", ""); + String fwkVersion = config.get("samza.fwk.version"); + String cmd = buildJobCoordinatorCmd(fwkPath, fwkVersion); + LOG.info(String.format("samza.fwk.path: %s. samza.fwk.version: %s. Command: %s", fwkPath, fwkVersion, cmd)); + Container container = KubeUtils.createContainer(JC_CONTAINER_NAME_PREFIX, image, request, cmd); + container.setEnv(getEnvs()); + + 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); + container.setVolumeMounts(Collections.singletonList(volumeMount)); + podBuilder = new PodBuilder() + .editOrNewMetadata() + .withNamespace(nameSpace) + .withName(podName) + .endMetadata() + .editOrNewSpec() + .withRestartPolicy(POD_RESTART_POLICY) + .withContainers(container) + .withVolumes(volume) + .endSpec(); + } else { + // create Pod + podBuilder = new PodBuilder() + .editOrNewMetadata() + .withNamespace(nameSpace) + .withName(podName) + .endMetadata() + .editOrNewSpec() + .withRestartPolicy(POD_RESTART_POLICY) + .withContainers(container) + .endSpec(); + } + + Pod pod = podBuilder.build(); + kubernetesClient.pods().create(pod); + // TODO: SAMZA-2247: the watcher here makes Client hung (always waiting). Although it doesn't affect the operator + // and worker containers, we still need to fix this issue. + kubernetesClient.pods().withName(podName).watch(watcher); + return this; + } + + /** + * Kill the job coordinator pod + */ + public KubeJob kill() { + LOG.info("Killing application: {}, operator pod: {}, namespace: {}", config.get(APP_NAME), podName, nameSpace); + System.out.println("Killing application: " + config.get(APP_NAME) + + "; Operator pod: " + podName + "; namespace: " + nameSpace); + kubernetesClient.pods().inNamespace(nameSpace).withName(podName).delete(); + return this; + } + + /** + * Wait for finish without timeout + */ + public ApplicationStatus waitForFinish(long timeoutMs) { + watcher.waitForCompleted(timeoutMs, TimeUnit.MILLISECONDS); + return getStatus(); + } + + /** + * Wait for the application to reach a status + */ + public ApplicationStatus waitForStatus(ApplicationStatus status, long timeoutMs) { + switch (status.getStatusCode()) { + case New: + watcher.waitForPending(timeoutMs, TimeUnit.MILLISECONDS); + return New; + case Running: + watcher.waitForRunning(timeoutMs, TimeUnit.MILLISECONDS); + return Running; + case SuccessfulFinish: + watcher.waitForSucceeded(timeoutMs, TimeUnit.MILLISECONDS); + return SuccessfulFinish; + case UnsuccessfulFinish: + watcher.waitForFailed(timeoutMs, TimeUnit.MILLISECONDS); + return UnsuccessfulFinish; + default: + throw new SamzaException("Unsupported application status type: " + status); + } + } + + /** + * Get teh Status of the job coordinator pod + */ + public ApplicationStatus getStatus() { + Pod operatorPod = kubernetesClient.pods().inNamespace(nameSpace).withName(podName).get(); + PodStatus podStatus = operatorPod.getStatus(); + // TODO + switch (podStatus.getPhase()) { + case "Pending": + currentStatus = ApplicationStatus.New; + break; + case "Running": + currentStatus = Running; + break; + case "Completed": + case "Succeeded": + currentStatus = ApplicationStatus.SuccessfulFinish; + break; + case "Failed": + String err = new StringBuilder().append("Reason: ").append(podStatus.getReason()) + .append("Conditions: ").append(podStatus.getConditions().toString()).toString(); + currentStatus = ApplicationStatus.unsuccessfulFinish(new SamzaException(err)); + break; + case "CrashLoopBackOff": + case "Unknown": + default: + currentStatus = ApplicationStatus.New; + } + return currentStatus; + } + + // Build the job coordinator command + private String buildJobCoordinatorCmd(String fwkPath, String fwkVersion) { + // figure out if we have framework is deployed into a separate location + if (fwkVersion == null || fwkVersion.isEmpty()) { + fwkVersion = "STABLE"; + } + LOG.info(String.format("KubeJob: fwk_path is %s, ver is %s use it directly ", fwkPath, fwkVersion)); + + // default location + String cmdExec = DEFAULT_DIRECTORY + "bin/run-jc.sh"; + if (!fwkPath.isEmpty()) { + // if we have framework installed as a separate package - use it + cmdExec = fwkPath + "/" + fwkVersion + "/bin/run-jc.sh"; + } + return cmdExec; + } + + // Construct the envs for the job coordinator pod + private List<EnvVar> getEnvs() { Review comment: Can this function be shared between yarn and kubernetes? Seems the only thing added is the podName ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
