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From GitBox <...@apache.org>
Subject [GitHub] [flink] rmetzger commented on a change in pull request #13217: [FLINK-16866] Make job submission non-blocking
Date Tue, 25 Aug 2020 08:48:41 GMT

rmetzger commented on a change in pull request #13217:
URL: https://github.com/apache/flink/pull/13217#discussion_r476284026



##########
File path: flink-runtime/src/main/java/org/apache/flink/runtime/dispatcher/DispatcherJob.java
##########
@@ -0,0 +1,242 @@
+/*
+ * 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.flink.runtime.dispatcher;
+
+import org.apache.flink.api.common.JobID;
+import org.apache.flink.api.common.JobStatus;
+import org.apache.flink.api.common.time.Time;
+import org.apache.flink.runtime.concurrent.FutureUtils;
+import org.apache.flink.runtime.execution.ExecutionState;
+import org.apache.flink.runtime.executiongraph.ArchivedExecutionGraph;
+import org.apache.flink.runtime.jobmaster.JobManagerRunner;
+import org.apache.flink.runtime.jobmaster.JobMasterGateway;
+import org.apache.flink.runtime.messages.Acknowledge;
+import org.apache.flink.runtime.messages.webmonitor.JobDetails;
+import org.apache.flink.runtime.rpc.RpcUtils;
+import org.apache.flink.util.AutoCloseableAsync;
+import org.apache.flink.util.Preconditions;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.annotation.concurrent.GuardedBy;
+
+import java.util.concurrent.CompletableFuture;
+
+/**
+ * Abstraction used by the {@link Dispatcher} to manage JobManagers, in
+ * particular during initialization.
+ * While a job is initializing, the JobMasterGateway is not available. A small subset
+ * of the methods of the JobMasterGateway necessary during initialization are provided
+ * by this class (job details, cancel).
+ */
+public final class DispatcherJob implements AutoCloseableAsync {
+
+	private final Logger log = LoggerFactory.getLogger(DispatcherJob.class);
+
+	private final CompletableFuture<JobManagerRunner> jobManagerRunnerFuture;
+	private final CompletableFuture<ArchivedExecutionGraph> jobResultFuture;
+
+	private final long initializationTimestamp;
+	private final JobID jobId;
+	private final String jobName;
+
+	private final Object lock = new Object();
+
+	// internal field to track job status during initialization. Is not updated anymore after
+	// job is initialized, cancelled or failed.
+	@GuardedBy("lock")
+	private JobStatus jobStatus = JobStatus.INITIALIZING;
+
+	private final CompletableFuture<Void> terminationFuture = new CompletableFuture<>();
+
+	private enum SubmissionType {
+		INITIAL, RECOVERY
+	}
+
+	static DispatcherJob createForSubmission(
+		CompletableFuture<JobManagerRunner> jobManagerRunnerFuture,
+		JobID jobId,
+		String jobName,
+		long initializationTimestamp) {
+		return new DispatcherJob(jobManagerRunnerFuture, jobId, jobName, initializationTimestamp,
SubmissionType.INITIAL);
+	}
+
+	static DispatcherJob createForRecovery(
+		CompletableFuture<JobManagerRunner> jobManagerRunnerFuture,
+		JobID jobId,
+		String jobName,
+		long initializationTimestamp) {
+		return new DispatcherJob(jobManagerRunnerFuture, jobId, jobName, initializationTimestamp,
SubmissionType.RECOVERY);
+	}
+
+	private DispatcherJob(
+		CompletableFuture<JobManagerRunner> jobManagerRunnerFuture,
+		JobID jobId,
+		String jobName,
+		long initializationTimestamp,
+		SubmissionType submissionType) {
+		this.jobManagerRunnerFuture = jobManagerRunnerFuture;
+		this.jobId = jobId;
+		this.jobName = jobName;
+		this.initializationTimestamp = initializationTimestamp;
+		this.jobResultFuture = new CompletableFuture<>();
+
+		FutureUtils.assertNoException(this.jobManagerRunnerFuture.handle((jobManagerRunner, throwable)
-> {
+			// JM has been initialized, or the initialization failed
+			synchronized (lock) {
+				if (throwable == null) {
+					// Forward result future
+					FutureUtils.forward(jobManagerRunner.getResultFuture(), jobResultFuture);
+
+					if (jobStatus == JobStatus.CANCELLING) {
+						log.info("Cancellation during initialization has been requested for job {}. Initialization
completed, cancelling job.", jobId);
+
+						// cancel job
+						jobManagerRunner
+							.getJobMasterGateway()
+							.thenCompose(gw -> gw.cancel(RpcUtils.INF_TIMEOUT))
+							.whenComplete((ignored, cancelThrowable) -> {
+							if (cancelThrowable != null) {
+								log.warn("Cancellation of job {} failed", jobId, cancelThrowable);
+							}
+						});

Review comment:
       You are right. it is more elegant to schedule the cancel immediately.




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