umustafi commented on code in PR #3896:
URL: https://github.com/apache/gobblin/pull/3896#discussion_r1542124284
##########
gobblin-service/src/main/java/org/apache/gobblin/service/modules/orchestration/MostlyMySqlDagManagementStateStore.java:
##########
@@ -201,8 +210,13 @@ public boolean containsDag(DagManager.DagId dagId) throws
IOException {
}
@Override
- public Optional<Dag.DagNode<JobExecutionPlan>> getDagNode(DagNodeId
dagNodeId) {
- return Optional.of(this.dagNodes.get(dagNodeId));
+ public Optional<Pair<Dag.DagNode<JobExecutionPlan>, JobStatus>>
getDagNodeWithJobStatus(DagNodeId dagNodeId) {
Review Comment:
can you have dagNode without jobStatus present? Seems yes, but wouldn't be
useful to us in that case but worth noting why we choose to return empty
optional.
##########
gobblin-service/src/main/java/org/apache/gobblin/service/modules/orchestration/proc/ReevaluateDagProc.java:
##########
@@ -0,0 +1,207 @@
+/*
+ * 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.proc;
+
+import java.io.IOException;
+import java.util.Optional;
+import java.util.Set;
+
+import com.codahale.metrics.Timer;
+
+import lombok.extern.slf4j.Slf4j;
+
+import org.apache.gobblin.metrics.ServiceMetricNames;
+import org.apache.gobblin.metrics.event.TimingEvent;
+import org.apache.gobblin.runtime.api.DagActionStore;
+import org.apache.gobblin.service.ExecutionStatus;
+import org.apache.gobblin.service.modules.flowgraph.Dag;
+import org.apache.gobblin.service.modules.flowgraph.DagNodeId;
+import
org.apache.gobblin.service.modules.orchestration.DagManagementStateStore;
+import org.apache.gobblin.service.modules.orchestration.DagManagerUtils;
+import org.apache.gobblin.service.modules.orchestration.task.ReevaluateDagTask;
+import org.apache.gobblin.service.modules.spec.JobExecutionPlan;
+import org.apache.gobblin.service.monitoring.FlowStatusGenerator;
+import org.apache.gobblin.service.monitoring.JobStatus;
+
+
+/**
+ * An implementation for {@link DagProc} that launches a new job if there
exists a job whose pre-requisite jobs are
+ * completed successfully. If there are no more jobs to run and no job is
running for the Dag, it cleans up the Dag.
+ * (In future), if there are multiple new jobs to be launched, separate launch
dag actions are created for each of them.
+ */
+@Slf4j
+public class ReevaluateDagProc extends
DagProc<Optional<Dag.DagNode<JobExecutionPlan>>, Void> {
+ private final Timer jobStatusPolledTimer;
+ private final DagNodeId dagNodeId;
+ private Optional<JobStatus> jobStatus;
+
+ public ReevaluateDagProc(ReevaluateDagTask reEvaluateDagTask) {
+ super(reEvaluateDagTask);
+ this.jobStatusPolledTimer =
metricContext.timer(ServiceMetricNames.JOB_STATUS_POLLED_TIMER);
+ this.dagNodeId = getDagNodeId();
+ }
+
+ @Override
+ protected Optional<Dag.DagNode<JobExecutionPlan>>
initialize(DagManagementStateStore dagManagementStateStore)
+ throws IOException {
+ Optional<Dag.DagNode<JobExecutionPlan>> dagNode =
dagManagementStateStore.getDagNode(this.dagNodeId);
+ if (!dagNode.isPresent()) {
+ log.error("DagNode not found for a Reevaluate DagAction with dag node id
{}", this.dagNodeId);
+ return Optional.empty();
+ }
+
+ this.jobStatus =
dagManagementStateStore.getJobStatus(getDagNodeId().getFlowGroup(),
getDagNodeId().getFlowName(),
+ getDagNodeId().getFlowExecutionId(), getDagNodeId().getJobGroup(),
getDagNodeId().getJobName());
+ if (!this.jobStatus.isPresent()) {
+ log.error("JobStatus not found for the dag node {}", getDagNodeId());
+ return Optional.empty();
+ }
+
+ ExecutionStatus executionStatus =
ExecutionStatus.valueOf(jobStatus.get().getEventName());
+ if
(!FlowStatusGenerator.FINISHED_STATUSES.contains(executionStatus.name())) {
+ log.warn("Job status for dagNode {} is {}. Re-evaluate dag action should
have been created only for finished status - {}",
+ dagNodeId, executionStatus, FlowStatusGenerator.FINISHED_STATUSES);
+ return Optional.empty();
+ }
+
+ setStatus(dagManagementStateStore, dagNode.get(), executionStatus);
+ return dagNode;
+ }
+
+ @Override
+ protected Void act(DagManagementStateStore dagManagementStateStore,
Optional<Dag.DagNode<JobExecutionPlan>> dagNode)
+ throws IOException {
+ if (!dagNode.isPresent()) {
+ // for several reasons it may receive an empty dag node, refer
initialize method
+ return null;
+ }
+
+ ExecutionStatus executionStatus =
dagNode.get().getValue().getExecutionStatus();
+ onJobFinish(dagManagementStateStore, dagNode.get(), executionStatus);
+ dagManagementStateStore.deleteDagNodeState(getDagId(), dagNode.get());
+
+ Dag<JobExecutionPlan> dag =
dagManagementStateStore.getDag(getDagId()).get();
Review Comment:
+1 let's read and then write if read value has not changed
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