[GitHub] [flink] zhuzhurk commented on a change in pull request #8851: [FLINK-12876] [runtime] Add an adapter of region failover NG for legacy scheduler

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zhuzhurk commented on a change in pull request #8851: [FLINK-12876] [runtime] Add an adapter of region failover NG for legacy scheduler
URL: https://github.com/apache/flink/pull/8851#discussion_r296664665
 
 

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 File path: flink-runtime/src/main/java/org/apache/flink/runtime/executiongraph/failover/AdaptedRestartPipelinedRegionStrategyNG.java
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+/*
+ * 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.executiongraph.failover;
+
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.runtime.JobException;
+import org.apache.flink.runtime.checkpoint.CheckpointException;
+import org.apache.flink.runtime.checkpoint.CheckpointFailureReason;
+import org.apache.flink.runtime.concurrent.FutureUtils;
+import org.apache.flink.runtime.executiongraph.Execution;
+import org.apache.flink.runtime.executiongraph.ExecutionGraph;
+import org.apache.flink.runtime.executiongraph.ExecutionJobVertex;
+import org.apache.flink.runtime.executiongraph.ExecutionVertex;
+import org.apache.flink.runtime.executiongraph.GlobalModVersionMismatch;
+import org.apache.flink.runtime.executiongraph.failover.adapter.DefaultFailoverTopology;
+import org.apache.flink.runtime.executiongraph.failover.flip1.FailoverRegion;
+import org.apache.flink.runtime.executiongraph.failover.flip1.RestartPipelinedRegionStrategy;
+import org.apache.flink.runtime.jobgraph.JobStatus;
+import org.apache.flink.runtime.jobgraph.JobVertexID;
+import org.apache.flink.runtime.jobmanager.scheduler.CoLocationGroup;
+import org.apache.flink.runtime.scheduler.ExecutionVertexVersion;
+import org.apache.flink.runtime.scheduler.ExecutionVertexVersioner;
+import org.apache.flink.runtime.scheduler.strategy.ExecutionVertexID;
+import org.apache.flink.util.ExceptionUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.CancellationException;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CompletionException;
+import java.util.stream.Collectors;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * This failover strategy uses flip1.RestartPipelinedRegionStrategy to make task failover decisions.
+ */
+public class AdaptedRestartPipelinedRegionStrategyNG extends FailoverStrategy {
+
+	/** The log object used for debugging. */
+	private static final Logger LOG = LoggerFactory.getLogger(AdaptedRestartPipelinedRegionStrategyNG.class);
+
+	/** The execution graph on which this FailoverStrategy works. */
+	private final ExecutionGraph executionGraph;
+
+	/** The underlying new generation region failover strategy. */
+	private RestartPipelinedRegionStrategy restartPipelinedRegionStrategy;
+
+	/** The versioner helps to maintain execution vertex versions. */
+	private final ExecutionVertexVersioner executionVertexVersioner;
+
+	public AdaptedRestartPipelinedRegionStrategyNG(final ExecutionGraph executionGraph) {
+		this.executionGraph = checkNotNull(executionGraph);
+		this.executionVertexVersioner = new ExecutionVertexVersioner();
+	}
+
+	@Override
+	public void onTaskFailure(final Execution taskExecution, final Throwable cause) {
+		// skip the failover if global restart strategy suppresses restarts
+		if (!executionGraph.getRestartStrategy().canRestart()) {
+			// delegate the failure to a global fail that will check the restart strategy and not restart
+			LOG.info("Fail to pass the restart strategy validation in region failover. Fallback to fail global.");
+			executionGraph.failGlobal(cause);
+			return;
+		}
+
+		// skip local failover if is in global failover
+		if (!isLocalFailoverValid(executionGraph.getGlobalModVersion())) {
+			LOG.info("Skip current region failover as a global failover is ongoing.");
+			return;
+		}
+
+		final ExecutionVertexID vertexID = getExecutionVertexID(taskExecution.getVertex());
+
+		final Set<ExecutionVertexID> tasksToRestart = restartPipelinedRegionStrategy.getTasksNeedingRestart(vertexID, cause);
+
+		// restart tasks at once
+		restartTasks(tasksToRestart);
+	}
+
+	private void restartTasks(final Set<ExecutionVertexID> verticesToRestart) {
+		// record current versions
+		final long globalModVersion = executionGraph.getGlobalModVersion();
+		final Set<ExecutionVertexVersion> vertexVersions = new HashSet<>(
+			executionVertexVersioner.recordVertexModifications(verticesToRestart).values());
+
+		// cancel tasks involved in this task failure
+		cancelTasks(verticesToRestart)
+			.thenAccept(
+				(Object ignored) -> {
+					// skip local failover if is in global failover
+					if (!isLocalFailoverValid(globalModVersion)) {
+						LOG.info("Skip current region failover as a global failover is ongoing.");
+						return;
+					}
+
+					// found out vertices which are still valid to restart.
+					// some vertices involved in this failover may be modified if another region
+					// failover happens during the cancellation stage of this failover.
+					// Will ignore the modified vertices as the other failover will deal with them.
+					final Set<ExecutionVertex> unmodifiedVertices = executionVertexVersioner
+						.getUnmodifiedExecutionVertices(vertexVersions)
+						.stream()
+						.map(id -> getExecutionVertex(id))
 
 Review comment:
   Ok

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