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com.hazelcast.cp.internal.raft.impl.task.InitLeadershipTransferTask Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2023, Hazelcast, Inc. All Rights Reserved.
*
* 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.hazelcast.cp.internal.raft.impl.task;
import com.hazelcast.cp.internal.raft.impl.RaftEndpoint;
import com.hazelcast.cp.internal.raft.impl.RaftNodeImpl;
import com.hazelcast.cp.internal.raft.impl.RaftNodeStatus;
import com.hazelcast.cp.internal.raft.impl.state.LeaderState;
import com.hazelcast.cp.internal.raft.impl.state.RaftState;
import com.hazelcast.spi.impl.InternalCompletableFuture;
/**
* Initializes the leadership transfer process, if the local Raft node
* is the leader with {@link RaftNodeStatus#ACTIVE} status and the given
* endpoint is a committed group member.
*/
public class InitLeadershipTransferTask implements Runnable {
private static final int LEADERSHIP_TRANSFER_RETRY_COUNT = 5;
private final RaftNodeImpl raftNode;
private final RaftEndpoint targetEndpoint;
private final InternalCompletableFuture resultFuture;
public InitLeadershipTransferTask(RaftNodeImpl raftNode, RaftEndpoint targetEndpoint,
InternalCompletableFuture resultFuture) {
this.raftNode = raftNode;
this.targetEndpoint = targetEndpoint;
this.resultFuture = resultFuture;
}
@Override
public void run() {
if (!raftNode.getCommittedMembers().contains(targetEndpoint)) {
resultFuture.completeExceptionally(new IllegalArgumentException("Cannot transfer leadership to " + targetEndpoint
+ " because it is not in the committed group member list!"));
return;
}
if (raftNode.getStatus() != RaftNodeStatus.ACTIVE) {
resultFuture.completeExceptionally(new IllegalStateException("Cannot transfer leadership to " + targetEndpoint
+ " because the status is " + raftNode.getStatus()));
return;
}
RaftState state = raftNode.state();
LeaderState leaderState = state.leaderState();
if (leaderState == null) {
resultFuture.completeExceptionally(new IllegalStateException("Cannot transfer leadership to " + targetEndpoint
+ " because I am not the leader!"));
return;
}
if (raftNode.getLocalMember().equals(targetEndpoint)) {
raftNode.getLogger(getClass()).warning("I am already the leader... There is no leadership transfer to myself.");
resultFuture.complete(null);
return;
}
if (state.initLeadershipTransfer(targetEndpoint, resultFuture)) {
new LeadershipTransferTask(raftNode, LEADERSHIP_TRANSFER_RETRY_COUNT).run();
}
}
}
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