phet commented on code in PR #3776: URL: https://github.com/apache/gobblin/pull/3776#discussion_r1343377058
########## gobblin-service/src/main/java/org/apache/gobblin/service/modules/orchestration/DagTaskStream.java: ########## @@ -0,0 +1,273 @@ +/* + * 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.gobblin.service.modules.orchestration; + +import java.io.IOException; +import java.util.Iterator; +import java.util.Optional; +import java.util.Properties; +import java.util.concurrent.BlockingDeque; +import java.util.concurrent.ExecutionException; +import java.util.concurrent.LinkedBlockingDeque; + +import com.codahale.metrics.Timer; +import com.google.common.base.Preconditions; +import com.typesafe.config.Config; +import com.typesafe.config.ConfigException; + +import lombok.AllArgsConstructor; +import lombok.Getter; +import lombok.extern.slf4j.Slf4j; + +import org.apache.gobblin.annotation.Alpha; +import org.apache.gobblin.config.ConfigBuilder; +import org.apache.gobblin.configuration.ConfigurationKeys; +import org.apache.gobblin.metrics.event.TimingEvent; +import org.apache.gobblin.runtime.api.DagActionStore; +import org.apache.gobblin.runtime.api.MultiActiveLeaseArbiter; +import org.apache.gobblin.runtime.spec_catalog.FlowCatalog; +import org.apache.gobblin.service.ExecutionStatus; +import org.apache.gobblin.service.modules.flowgraph.Dag; +import org.apache.gobblin.service.modules.orchestration.processor.KillDagProc; +import org.apache.gobblin.service.modules.orchestration.task.DagTask; +import org.apache.gobblin.service.modules.orchestration.task.KillDagTask; +import org.apache.gobblin.service.modules.spec.JobExecutionPlan; +import org.apache.gobblin.service.modules.utils.FlowCompilationValidationHelper; +import org.apache.gobblin.service.monitoring.JobStatus; +import org.apache.gobblin.service.monitoring.JobStatusRetriever; + +import static org.apache.gobblin.service.ExecutionStatus.ORCHESTRATED; +import static org.apache.gobblin.service.ExecutionStatus.valueOf; + + +/** + * Holds a stream of {@link DagTask} that {@link DagManager} would pull from to process, as it is ready for more work. + * It provides an implementation for {@link DagManagement} defines the rules for a flow and job. + * Implements {@link Iterator} to provide the next {@link DagTask} if available to {@link DagManager} + */ + +@Alpha +@Slf4j +@AllArgsConstructor +public class DagTaskStream implements Iterator<Optional<DagTask>>, DagManagement { + + @Getter + private final BlockingDeque<DagActionStore.DagAction> dagActionQueue = new LinkedBlockingDeque<>(); + private FlowTriggerHandler flowTriggerHandler; + private DagManagementStateStore dagManagementStateStore; + private DagManagerMetrics dagManagerMetrics; + + + @Override + public boolean hasNext() { + return true; + } + + + @Override + public Optional<DagTask> next() { + + DagActionStore.DagAction dagAction = dagActionQueue.peek(); + try { + Preconditions.checkArgument(dagAction != null, "No Dag Action found in the queue"); + Properties jobProps = getJobProperties(dagAction); + Optional<MultiActiveLeaseArbiter.LeaseObtainedStatus> leaseObtainedStatus = + flowTriggerHandler.getLeaseOnDagAction(jobProps, dagAction, System.currentTimeMillis()).toJavaUtil(); + if(leaseObtainedStatus.isPresent()) { + DagTask dagTask = createDagTask(dagAction, leaseObtainedStatus.get()); + return Optional.of(dagTask); + } + } catch (Exception ex) { + //TODO: need to handle exceptions gracefully + throw new RuntimeException(ex); + } + return Optional.empty(); + } + + public boolean add(DagActionStore.DagAction dagAction) throws IOException { + return this.dagActionQueue.offer(dagAction); + } + + public DagActionStore.DagAction take() { + return this.dagActionQueue.poll(); + } + + public DagTask createDagTask(DagActionStore.DagAction dagAction, MultiActiveLeaseArbiter.LeaseObtainedStatus leaseObtainedStatus) { + DagActionStore.FlowActionType flowActionType = dagAction.getFlowActionType(); + switch (flowActionType) { + case KILL: + return new KillDagTask(dagAction, leaseObtainedStatus); + case RESUME: + case LAUNCH: + case ADVANCE: + default: + log.warn("It should not reach here. Yet to provide implementation."); + return null; + } + } + + @Override + public void launchFlow(String flowGroup, String flowName, long triggerTimeStamp) { + //TODO: provide implementation after finalizing code flow + throw new UnsupportedOperationException("Currently launch flow is not supported."); + } + + @Override + public void resumeFlow(String flowGroup, String flowName, String flowExecutionId, long triggerTimeStamp) throws IOException, InterruptedException { + //TODO: provide implementation after finalizing code flow + throw new UnsupportedOperationException("Currently launch flow is not supported."); + } + + @Override + public void killFlow(String flowGroup, String flowName, String flowExecutionId, long produceTimestamp) throws IOException { + DagManager.DagId dagId = DagManagerUtils.generateDagId(flowGroup, flowName, flowExecutionId); + if(!this.dagManagementStateStore.getDagIdToDags().containsKey(dagId.toString())) { + log.info("Invalid dag since not present in map. Hence cannot cancel it"); + return; + } + DagActionStore.DagAction killAction = new DagActionStore.DagAction(flowGroup, flowName, flowExecutionId, DagActionStore.FlowActionType.KILL); + if(!add(killAction)) { + throw new IOException("Could not add kill dag action: " + killAction + " to the queue."); + } + } + /** + * Check if the SLA is configured for the flow this job belongs to. + * If it is, this method will try to cancel the job when SLA is reached. + * + * @param node dag node of the job + * @return true if the job is killed because it reached sla + * @throws ExecutionException exception + * @throws InterruptedException exception + */ + + @Override + public boolean enforceFlowCompletionDeadline(Dag.DagNode<JobExecutionPlan> node) throws ExecutionException, InterruptedException { + //TODO: need to distribute the responsibility outside of this class + long flowStartTime = DagManagerUtils.getFlowStartTime(node); + long currentTime = System.currentTimeMillis(); + String dagId = DagManagerUtils.generateDagId(node).toString(); + + long flowSla; + if (this.dagManagementStateStore.getDagToSLA().containsKey(dagId)) { + flowSla = this.dagManagementStateStore.getDagToSLA().get(dagId); + } else { + try { + flowSla = DagManagerUtils.getFlowSLA(node); + } catch (ConfigException e) { + log.warn("Flow SLA for flowGroup: {}, flowName: {} is given in invalid format, using default SLA of {}", + node.getValue().getJobSpec().getConfig().getString(ConfigurationKeys.FLOW_GROUP_KEY), + node.getValue().getJobSpec().getConfig().getString(ConfigurationKeys.FLOW_NAME_KEY), + DagManagerUtils.DEFAULT_FLOW_SLA_MILLIS); + flowSla = DagManagerUtils.DEFAULT_FLOW_SLA_MILLIS; + } + this.dagManagementStateStore.getDagToSLA().put(dagId, flowSla); + } + + if (currentTime > flowStartTime + flowSla) { + log.info("Flow {} exceeded the SLA of {} ms. Killing the job {} now...", + node.getValue().getJobSpec().getConfig().getString(ConfigurationKeys.FLOW_NAME_KEY), flowSla, + node.getValue().getJobSpec().getConfig().getString(ConfigurationKeys.JOB_NAME_KEY)); + dagManagerMetrics.incrementExecutorSlaExceeded(node); + KillDagProc.killDagNode(node); + + this.dagManagementStateStore.getDagIdToDags().get(dagId).setFlowEvent(TimingEvent.FlowTimings.FLOW_RUN_DEADLINE_EXCEEDED); + this.dagManagementStateStore.getDagIdToDags().get(dagId).setMessage("Flow killed due to exceeding SLA of " + flowSla + " ms"); + + return true; + } + return false; + } + + /** + * Cancel the job if the job has been "orphaned". A job is orphaned if has been in ORCHESTRATED + * {@link ExecutionStatus} for some specific amount of time. + * @param node {@link Dag.DagNode} representing the job + * @param jobStatus current {@link JobStatus} of the job + * @return true if the total time that the job remains in the ORCHESTRATED state exceeds + * {@value ConfigurationKeys#GOBBLIN_JOB_START_SLA_TIME}. + */ + + @Override + public boolean enforceJobStartDeadline(Dag.DagNode<JobExecutionPlan> node, JobStatus jobStatus) throws ExecutionException, InterruptedException { + //TODO: need to distribute the responsibility outside of this class + if (jobStatus == null) { + return false; + } + ExecutionStatus executionStatus = valueOf(jobStatus.getEventName()); + //TODO: initialize default job sla in millis via configs + long timeOutForJobStart = DagManagerUtils.getJobStartSla(node, System.currentTimeMillis()); + long jobOrchestratedTime = jobStatus.getOrchestratedTime(); + if (executionStatus == ORCHESTRATED && System.currentTimeMillis() - jobOrchestratedTime > timeOutForJobStart) { + log.info("Job {} of flow {} exceeded the job start SLA of {} ms. Killing the job now...", + DagManagerUtils.getJobName(node), + DagManagerUtils.getFullyQualifiedDagName(node), + timeOutForJobStart); + dagManagerMetrics.incrementCountsStartSlaExceeded(node); + KillDagProc.killDagNode(node); + + String dagId = DagManagerUtils.generateDagId(node).toString(); + dagManagementStateStore.getDagIdToDags().get(dagId).setFlowEvent(TimingEvent.FlowTimings.FLOW_START_DEADLINE_EXCEEDED); + dagManagementStateStore.getDagIdToDags().get(dagId).setMessage("Flow killed because no update received for " + timeOutForJobStart + " ms after orchestration"); + return true; + } else { + return false; + } + + } + + /** + * Retrieve the {@link JobStatus} from the {@link JobExecutionPlan}. + */ + + protected JobStatus retrieveJobStatus(Dag.DagNode<JobExecutionPlan> dagNode) { Review Comment: ping here.... still not clear the extent of the "state" management/retrieval going on (and whether appropriate to this class), since `getStatus` throws `UnsupportedOperationException` -- This is an automated message from the Apache Git Service. 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