org.apache.flink.runtime.jobmanager.HighAvailabilityMode Maven / Gradle / Ivy
/*
* 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.jobmanager;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.configuration.HighAvailabilityOptions;
/**
* High availability mode for Flink's cluster execution. Currently supported modes are:
*
* - NONE: No high availability. - ZooKeeper: JobManager high availability via ZooKeeper
* ZooKeeper is used to select a leader among a group of JobManager. This JobManager is responsible
* for the job execution. Upon failure of the leader a new leader is elected which will take over
* the responsibilities of the old leader - FACTORY_CLASS: Use implementation of {@link
* org.apache.flink.runtime.highavailability.HighAvailabilityServicesFactory} specified in
* configuration property high-availability
*/
public enum HighAvailabilityMode {
NONE(false),
ZOOKEEPER(true),
KUBERNETES(true),
FACTORY_CLASS(true);
private final boolean haActive;
HighAvailabilityMode(boolean haActive) {
this.haActive = haActive;
}
/**
* Return the configured {@link HighAvailabilityMode}.
*
* @param config The config to parse
* @return Configured recovery mode or {@link HighAvailabilityMode#NONE} if not configured.
*/
public static HighAvailabilityMode fromConfig(Configuration config) {
String haMode = config.getValue(HighAvailabilityOptions.HA_MODE);
if (haMode == null) {
return HighAvailabilityMode.NONE;
} else if (haMode.equalsIgnoreCase("standalone")) {
// Map old default to new default
return HighAvailabilityMode.NONE;
} else {
try {
return HighAvailabilityMode.valueOf(haMode.toUpperCase());
} catch (IllegalArgumentException e) {
return FACTORY_CLASS;
}
}
}
/**
* Returns true if the defined recovery mode supports high availability.
*
* @param configuration Configuration which contains the recovery mode
* @return true if high availability is supported by the recovery mode, otherwise false
*/
public static boolean isHighAvailabilityModeActivated(Configuration configuration) {
HighAvailabilityMode mode = fromConfig(configuration);
return mode.haActive;
}
}