org.apache.flink.runtime.executiongraph.failover.FailoverStrategyLoader Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* 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.failover;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.configuration.IllegalConfigurationException;
import org.apache.flink.configuration.JobManagerOptions;
import org.apache.flink.util.StringUtils;
import org.slf4j.Logger;
import javax.annotation.Nullable;
/**
* A utility class to load failover strategies from the configuration.
*/
public class FailoverStrategyLoader {
/** Config name for the {@link RestartAllStrategy}. */
public static final String FULL_RESTART_STRATEGY_NAME = "full";
/** Config name for the {@link RestartIndividualStrategy}. */
public static final String INDIVIDUAL_RESTART_STRATEGY_NAME = "individual";
/** Config name for the {@link AdaptedRestartPipelinedRegionStrategyNG}. */
public static final String PIPELINED_REGION_RESTART_STRATEGY_NAME = "region";
// ------------------------------------------------------------------------
/**
* Loads a FailoverStrategy Factory from the given configuration.
*/
public static FailoverStrategy.Factory loadFailoverStrategy(Configuration config, @Nullable Logger logger) {
final String strategyParam = config.getString(JobManagerOptions.EXECUTION_FAILOVER_STRATEGY);
if (StringUtils.isNullOrWhitespaceOnly(strategyParam)) {
if (logger != null) {
logger.warn("Null config value for {} ; using default failover strategy (full restarts).",
JobManagerOptions.EXECUTION_FAILOVER_STRATEGY.key());
}
return new RestartAllStrategy.Factory();
}
else {
switch (strategyParam.toLowerCase()) {
case FULL_RESTART_STRATEGY_NAME:
return new RestartAllStrategy.Factory();
case PIPELINED_REGION_RESTART_STRATEGY_NAME:
return new AdaptedRestartPipelinedRegionStrategyNG.Factory();
case INDIVIDUAL_RESTART_STRATEGY_NAME:
return new RestartIndividualStrategy.Factory();
default:
// we could interpret the parameter as a factory class name and instantiate that
// for now we simply do not support this
throw new IllegalConfigurationException("Unknown failover strategy: " + strategyParam);
}
}
}
}