org.apache.flink.runtime.executiongraph.restart.FixedDelayRestartStrategy Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* 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,
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* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.flink.runtime.executiongraph.restart;
import org.apache.flink.configuration.ConfigConstants;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.runtime.concurrent.ScheduledExecutor;
import org.apache.flink.runtime.executiongraph.ExecutionGraph;
import org.apache.flink.util.Preconditions;
import scala.concurrent.duration.Duration;
import java.util.concurrent.TimeUnit;
/**
* Restart strategy which tries to restart the given {@link ExecutionGraph} a fixed number of times
* with a fixed time delay in between.
*/
public class FixedDelayRestartStrategy implements RestartStrategy {
private final int maxNumberRestartAttempts;
private final long delayBetweenRestartAttempts;
private int currentRestartAttempt;
public FixedDelayRestartStrategy(
int maxNumberRestartAttempts,
long delayBetweenRestartAttempts) {
Preconditions.checkArgument(maxNumberRestartAttempts >= 0, "Maximum number of restart attempts must be positive.");
Preconditions.checkArgument(delayBetweenRestartAttempts >= 0, "Delay between restart attempts must be positive");
this.maxNumberRestartAttempts = maxNumberRestartAttempts;
this.delayBetweenRestartAttempts = delayBetweenRestartAttempts;
currentRestartAttempt = 0;
}
public int getCurrentRestartAttempt() {
return currentRestartAttempt;
}
@Override
public boolean canRestart() {
return currentRestartAttempt < maxNumberRestartAttempts;
}
@Override
public void restart(final RestartCallback restarter, ScheduledExecutor executor) {
currentRestartAttempt++;
executor.schedule(new Runnable() {
@Override
public void run() {
restarter.triggerFullRecovery();
}
}, delayBetweenRestartAttempts, TimeUnit.MILLISECONDS);
}
/**
* Creates a FixedDelayRestartStrategy from the given Configuration.
*
* @param configuration Configuration containing the parameter values for the restart strategy
* @return Initialized instance of FixedDelayRestartStrategy
* @throws Exception
*/
public static FixedDelayRestartStrategyFactory createFactory(Configuration configuration) throws Exception {
int maxAttempts = configuration.getInteger(ConfigConstants.RESTART_STRATEGY_FIXED_DELAY_ATTEMPTS, 1);
String delayString = configuration.getString(ConfigConstants.RESTART_STRATEGY_FIXED_DELAY_DELAY);
long delay;
try {
delay = Duration.apply(delayString).toMillis();
} catch (NumberFormatException nfe) {
throw new Exception("Invalid config value for " +
ConfigConstants.RESTART_STRATEGY_FIXED_DELAY_DELAY + ": " + delayString +
". Value must be a valid duration (such as '100 milli' or '10 s')");
}
return new FixedDelayRestartStrategyFactory(maxAttempts, delay);
}
@Override
public String toString() {
return "FixedDelayRestartStrategy(" +
"maxNumberRestartAttempts=" + maxNumberRestartAttempts +
", delayBetweenRestartAttempts=" + delayBetweenRestartAttempts +
')';
}
public static class FixedDelayRestartStrategyFactory extends RestartStrategyFactory {
private static final long serialVersionUID = 6642934067762271950L;
private final int maxAttempts;
private final long delay;
public FixedDelayRestartStrategyFactory(int maxAttempts, long delay) {
this.maxAttempts = maxAttempts;
this.delay = delay;
}
@Override
public RestartStrategy createRestartStrategy() {
return new FixedDelayRestartStrategy(maxAttempts, delay);
}
}
}