com.netflix.genie.web.spring.actuators.LeaderElectionActuator Maven / Gradle / Ivy
/*
*
* Copyright 2020 Netflix, Inc.
*
* Licensed 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 com.netflix.genie.web.spring.actuators;
import com.google.common.collect.ImmutableMap;
import com.netflix.genie.web.services.ClusterLeaderService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
import org.springframework.boot.actuate.endpoint.annotation.WriteOperation;
import java.util.Map;
/**
* An actuator endpoint that exposes leadership status and allows stop/start/restart of the leader election service.
* Useful when a specific set of nodes should be given priority to win the leader election (e.g., because they are
* running newer code).
*
* @author mprimi
* @since 4.0.0
*/
@Endpoint(id = "leaderElection")
@Slf4j
public class LeaderElectionActuator {
private static final String RUNNING = "running";
private static final String LEADER = "leader";
private final ClusterLeaderService clusterLeaderService;
/**
* Constructor.
*
* @param clusterLeaderService the cluster leader service
*/
public LeaderElectionActuator(final ClusterLeaderService clusterLeaderService) {
this.clusterLeaderService = clusterLeaderService;
}
/**
* Provides the current leader service status: whether the leader service is running and whether the node is leader.
*
* @return a map of attributes
*/
@ReadOperation
public Map getStatus() {
return ImmutableMap.builder()
.put(RUNNING, this.clusterLeaderService.isRunning())
.put(LEADER, this.clusterLeaderService.isLeader())
.build();
}
/**
* Forces the node to leave the leader election, then re-join it.
*
* @param action the action to perform
*/
@WriteOperation
public void doAction(final Action action) {
switch (action) {
case START:
log.info("Starting leader election service");
this.clusterLeaderService.start();
break;
case STOP:
log.info("Stopping leader election service");
this.clusterLeaderService.stop();
break;
case RESTART:
log.info("Restarting leader election service");
this.clusterLeaderService.stop();
this.clusterLeaderService.start();
break;
default:
log.error("Unknown action: " + action);
throw new UnsupportedOperationException("Unknown action: " + action.name());
}
}
/**
* Operations that this actuator can perform on the leader service.
*/
public enum Action {
/**
* Stop the leader election service.
*/
STOP,
/**
* Start the leader election service.
*/
START,
/**
* Stop then start the leader election service.
*/
RESTART,
/**
* NOOP action for the purpose of testing unknown actions.
*/
TEST,
}
}
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