ahuang98 commented on code in PR #18240: URL: https://github.com/apache/kafka/pull/18240#discussion_r1899072269
########## raft/src/main/java/org/apache/kafka/raft/ProspectiveState.java: ########## @@ -0,0 +1,178 @@ +/* + * 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.kafka.raft; + +import org.apache.kafka.common.utils.LogContext; +import org.apache.kafka.common.utils.Time; +import org.apache.kafka.common.utils.Timer; +import org.apache.kafka.raft.internals.EpochElection; + +import org.slf4j.Logger; + +import java.util.Optional; +import java.util.OptionalInt; + +import static org.apache.kafka.raft.QuorumState.unattachedOrProspectiveCanGrantVote; + +public class ProspectiveState implements NomineeState { + private final int localId; + private final int epoch; + private final OptionalInt leaderId; + private final Optional<Endpoints> leaderEndpoints; + private final Optional<ReplicaKey> votedKey; + private final VoterSet voters; + private final EpochElection epochElection; + private final Optional<LogOffsetMetadata> highWatermark; + private final int retries; + private final long electionTimeoutMs; + private final Timer electionTimer; + private final Logger log; + + /** + * The lifetime of a prospective state is the following. + * + * 1. Once started, it will send prevote requests and keep record of the received vote responses + * 2. If it receives a message denoting a leader with a higher epoch, it will transition to follower state. + * 3. If majority votes granted, it will transition to candidate state. + * 4. If majority votes rejected or election times out, it will transition to unattached or follower state + * depending on if it knows the leader id and endpoints or not + */ + public ProspectiveState( + Time time, + int localId, + int epoch, + OptionalInt leaderId, + Optional<Endpoints> leaderEndpoints, + Optional<ReplicaKey> votedKey, + VoterSet voters, + Optional<LogOffsetMetadata> highWatermark, + int retries, + int electionTimeoutMs, + LogContext logContext + ) { + this.localId = localId; + this.epoch = epoch; + this.leaderId = leaderId; + this.leaderEndpoints = leaderEndpoints; + this.votedKey = votedKey; + this.voters = voters; + this.highWatermark = highWatermark; + this.retries = retries; + this.electionTimeoutMs = electionTimeoutMs; + this.electionTimer = time.timer(electionTimeoutMs); + this.log = logContext.logger(ProspectiveState.class); + + this.epochElection = new EpochElection(voters.voterKeys()); + epochElection.recordVote(localId, true); + } + + public int localId() { + return localId; + } + + public Optional<ReplicaKey> votedKey() { + return votedKey; + } + + @Override + public EpochElection epochElection() { + return epochElection; + } + + public int retries() { + return retries; + } Review Comment: we can use this Jira to track - https://issues.apache.org/jira/browse/KAFKA-18345 -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: jira-unsubscr...@kafka.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
