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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2019/09/12 07:02:14 UTC

[GitHub] [flink] zhuzhurk commented on a change in pull request #8912: [FLINK-12709] [runtime] Implement new generation restart strategy loader which also respects legacy…

zhuzhurk commented on a change in pull request #8912: [FLINK-12709] [runtime] Implement new generation restart strategy loader which also respects legacy…
URL: https://github.com/apache/flink/pull/8912#discussion_r323583478
 
 

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 File path: flink-runtime/src/main/java/org/apache/flink/runtime/executiongraph/failover/flip1/RestartBackoffTimeStrategyFactoryLoader.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.flip1;
+
+import org.apache.flink.api.common.restartstrategy.RestartStrategies;
+import org.apache.flink.configuration.AkkaOptions;
+import org.apache.flink.configuration.ConfigConstants;
+import org.apache.flink.configuration.ConfigOption;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.configuration.RestartBackoffTimeStrategyOptions;
+import org.apache.flink.runtime.executiongraph.restart.FixedDelayRestartStrategy;
+import org.apache.flink.runtime.executiongraph.restart.NoRestartStrategy;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.concurrent.TimeUnit;
+
+import scala.concurrent.duration.Duration;
+
+import static org.apache.flink.util.Preconditions.checkArgument;
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * A utility class to load {@link RestartBackoffTimeStrategy.Factory} from the configuration.
+ */
+public class RestartBackoffTimeStrategyFactoryLoader {
+
+	private static final Logger LOG = LoggerFactory.getLogger(RestartBackoffTimeStrategyFactoryLoader.class);
+
+	private static final String CREATE_METHOD = "createFactory";
+
+	/**
+	 * Creates proper {@link RestartBackoffTimeStrategy.Factory}.
+	 * If new version restart strategy is specified, will directly use it.
+	 * Otherwise will decide based on legacy restart strategy configs.
+	 *
+	 * @param jobRestartStrategyConfiguration restart configuration given within the job graph
+	 * @param clusterConfiguration cluster(server-side) configuration, usually represented as jobmanager config
+	 * @param isCheckpointingEnabled if checkpointing was enabled for the job
+	 * @return new version restart strategy factory
+	 */
+	public static RestartBackoffTimeStrategy.Factory createRestartStrategyFactory(
+			final RestartStrategies.RestartStrategyConfiguration jobRestartStrategyConfiguration,
+			final Configuration clusterConfiguration,
+			final boolean isCheckpointingEnabled) throws Exception {
+
+		checkNotNull(jobRestartStrategyConfiguration);
+		checkNotNull(clusterConfiguration);
+
+		final String restartStrategyClassName = clusterConfiguration.getString(
+			RestartBackoffTimeStrategyOptions.RESTART_BACKOFF_TIME_STRATEGY_CLASS_NAME);
+
+		if (restartStrategyClassName != null) {
+			// create new restart strategy directly if it is specified in cluster config
+			return createRestartStrategyFactoryInternal(clusterConfiguration);
+		} else {
+			// adapt the legacy restart strategy configs as new restart strategy configs
+			final Configuration adaptedConfiguration = getAdaptedConfiguration(
+				jobRestartStrategyConfiguration,
+				clusterConfiguration,
+				isCheckpointingEnabled);
+
+			// create new restart strategy from the adapted config
+			return createRestartStrategyFactoryInternal(adaptedConfiguration);
+		}
+	}
+
+	/**
+	 * Decides the {@link RestartBackoffTimeStrategy} to use and its params based on legacy configs,
+	 * and records its class name and the params into a adapted configuration.
+	 *
+	 * <p>The decision making is as follows:
+	 * <ol>
+	 *     <li>Use strategy of {@link RestartStrategies.RestartStrategyConfiguration}, unless it's a
+	 * {@link RestartStrategies.FallbackRestartStrategyConfiguration} or not valid.</li>
+	 *     <li>If strategy is not decided, use legacy strategy specified in cluster(server-side) config,
+	 * unless it is not set or not valid</li>
+	 *     <li>If strategy is not decided, use {@link FixedDelayRestartStrategy} if checkpointing is
+	 * enabled. Otherwise use {@link NoRestartStrategy}</li>
+	 * </ol>
+	 *
+	 * @param jobRestartStrategyConfiguration restart configuration given within the job graph
+	 * @param clusterConfiguration cluster(server-side) configuration, usually represented as jobmanager config
+	 * @param isCheckpointingEnabled if checkpointing was enabled for the job
+	 * @return adapted configuration
+	 */
+	private static Configuration getAdaptedConfiguration(
+			final RestartStrategies.RestartStrategyConfiguration jobRestartStrategyConfiguration,
+			final Configuration clusterConfiguration,
+			final boolean isCheckpointingEnabled) throws Exception {
+
+		// clone a new config to not modify existing one
+		final Configuration adaptedConfiguration = new Configuration();
+
+		// try determining restart strategy based on job restart strategy config first
+		if (!tryAdaptingJobRestartStrategyConfiguration(jobRestartStrategyConfiguration, adaptedConfiguration)) {
+
+			// if job restart strategy config does not help
+			// try determining restart strategy based on cluster config as fallback
+			if (!tryAdaptingClusterRestartStrategyConfiguration(clusterConfiguration, adaptedConfiguration)) {
+
+				// if the restart strategy is not decided yet
+				// determine the strategy based on whether checkpointing is enabled
+				setDefaultRestartStrategyToConfiguration(isCheckpointingEnabled, adaptedConfiguration);
+			}
+		}
+
+		return adaptedConfiguration;
+	}
+
+	private static RestartBackoffTimeStrategy.Factory createRestartStrategyFactoryInternal(
+			final Configuration configuration) {
+
+		final String restartStrategyClassName = configuration.getString(
+			RestartBackoffTimeStrategyOptions.RESTART_BACKOFF_TIME_STRATEGY_CLASS_NAME);
+
+		if (restartStrategyClassName == null) {
+			LOG.info("No restart strategy is configured. Using no restart strategy.");
 
 Review comment:
   Ok.

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