kafka PartitionRegistration 源码

  • 2022-10-20
  • 浏览 (231)

kafka PartitionRegistration 代码

文件路径:/metadata/src/main/java/org/apache/kafka/metadata/PartitionRegistration.java

/*
 * 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.metadata;

import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.Uuid;
import org.apache.kafka.common.message.LeaderAndIsrRequestData.LeaderAndIsrPartitionState;
import org.apache.kafka.common.metadata.PartitionChangeRecord;
import org.apache.kafka.common.metadata.PartitionRecord;
import org.apache.kafka.server.common.ApiMessageAndVersion;
import org.slf4j.Logger;

import java.util.Arrays;
import java.util.Objects;

import static org.apache.kafka.metadata.LeaderConstants.NO_LEADER;
import static org.apache.kafka.metadata.LeaderConstants.NO_LEADER_CHANGE;


public class PartitionRegistration {
    public final int[] replicas;
    public final int[] isr;
    public final int[] removingReplicas;
    public final int[] addingReplicas;
    public final int leader;
    public final LeaderRecoveryState leaderRecoveryState;
    public final int leaderEpoch;
    public final int partitionEpoch;

    public static boolean electionWasClean(int newLeader, int[] isr) {
        return newLeader == NO_LEADER || Replicas.contains(isr, newLeader);
    }

    public PartitionRegistration(PartitionRecord record) {
        this(Replicas.toArray(record.replicas()),
            Replicas.toArray(record.isr()),
            Replicas.toArray(record.removingReplicas()),
            Replicas.toArray(record.addingReplicas()),
            record.leader(),
            LeaderRecoveryState.of(record.leaderRecoveryState()),
            record.leaderEpoch(),
            record.partitionEpoch());
    }

    public PartitionRegistration(int[] replicas, int[] isr, int[] removingReplicas,
                                 int[] addingReplicas, int leader, LeaderRecoveryState leaderRecoveryState,
                                 int leaderEpoch, int partitionEpoch) {
        this.replicas = replicas;
        this.isr = isr;
        this.removingReplicas = removingReplicas;
        this.addingReplicas = addingReplicas;
        this.leader = leader;
        this.leaderRecoveryState = leaderRecoveryState;
        this.leaderEpoch = leaderEpoch;
        this.partitionEpoch = partitionEpoch;
    }

    public PartitionRegistration merge(PartitionChangeRecord record) {
        int[] newReplicas = (record.replicas() == null) ?
            replicas : Replicas.toArray(record.replicas());
        int[] newIsr = (record.isr() == null) ? isr : Replicas.toArray(record.isr());
        int[] newRemovingReplicas = (record.removingReplicas() == null) ?
            removingReplicas : Replicas.toArray(record.removingReplicas());
        int[] newAddingReplicas = (record.addingReplicas() == null) ?
            addingReplicas : Replicas.toArray(record.addingReplicas());

        int newLeader;
        int newLeaderEpoch;
        if (record.leader() == NO_LEADER_CHANGE) {
            newLeader = leader;
            newLeaderEpoch = leaderEpoch;
        } else {
            newLeader = record.leader();
            newLeaderEpoch = leaderEpoch + 1;
        }

        LeaderRecoveryState newLeaderRecoveryState = leaderRecoveryState.changeTo(record.leaderRecoveryState());

        return new PartitionRegistration(newReplicas,
            newIsr,
            newRemovingReplicas,
            newAddingReplicas,
            newLeader,
            newLeaderRecoveryState,
            newLeaderEpoch,
            partitionEpoch + 1);
    }

    public String diff(PartitionRegistration prev) {
        StringBuilder builder = new StringBuilder();
        String prefix = "";
        if (!Arrays.equals(replicas, prev.replicas)) {
            builder.append(prefix).append("replicas: ").
                append(Arrays.toString(prev.replicas)).
                append(" -> ").append(Arrays.toString(replicas));
            prefix = ", ";
        }
        if (!Arrays.equals(isr, prev.isr)) {
            builder.append(prefix).append("isr: ").
                append(Arrays.toString(prev.isr)).
                append(" -> ").append(Arrays.toString(isr));
            prefix = ", ";
        }
        if (!Arrays.equals(removingReplicas, prev.removingReplicas)) {
            builder.append(prefix).append("removingReplicas: ").
                append(Arrays.toString(prev.removingReplicas)).
                append(" -> ").append(Arrays.toString(removingReplicas));
            prefix = ", ";
        }
        if (!Arrays.equals(addingReplicas, prev.addingReplicas)) {
            builder.append(prefix).append("addingReplicas: ").
                append(Arrays.toString(prev.addingReplicas)).
                append(" -> ").append(Arrays.toString(addingReplicas));
            prefix = ", ";
        }
        if (leader != prev.leader) {
            builder.append(prefix).append("leader: ").
                append(prev.leader).append(" -> ").append(leader);
            prefix = ", ";
        }
        if (leaderRecoveryState != prev.leaderRecoveryState) {
            builder.append(prefix).append("leaderRecoveryState: ").
                append(prev.leaderRecoveryState).append(" -> ").append(leaderRecoveryState);
            prefix = ", ";
        }
        if (leaderEpoch != prev.leaderEpoch) {
            builder.append(prefix).append("leaderEpoch: ").
                append(prev.leaderEpoch).append(" -> ").append(leaderEpoch);
            prefix = ", ";
        }
        if (partitionEpoch != prev.partitionEpoch) {
            builder.append(prefix).append("partitionEpoch: ").
                append(prev.partitionEpoch).append(" -> ").append(partitionEpoch);
        }
        return builder.toString();
    }

    public void maybeLogPartitionChange(Logger log, String description, PartitionRegistration prev) {
        if (!electionWasClean(leader, prev.isr)) {
            log.info("UNCLEAN partition change for {}: {}", description, diff(prev));
        } else if (log.isDebugEnabled()) {
            log.debug("partition change for {}: {}", description, diff(prev));
        }
    }

    public boolean hasLeader() {
        return leader != LeaderConstants.NO_LEADER;
    }

    public boolean hasPreferredLeader() {
        return leader == preferredReplica();
    }

    public int preferredReplica() {
        return replicas.length == 0 ? LeaderConstants.NO_LEADER : replicas[0];
    }

    public ApiMessageAndVersion toRecord(Uuid topicId, int partitionId) {
        return new ApiMessageAndVersion(new PartitionRecord().
            setPartitionId(partitionId).
            setTopicId(topicId).
            setReplicas(Replicas.toList(replicas)).
            setIsr(Replicas.toList(isr)).
            setRemovingReplicas(Replicas.toList(removingReplicas)).
            setAddingReplicas(Replicas.toList(addingReplicas)).
            setLeader(leader).
            setLeaderRecoveryState(leaderRecoveryState.value()).
            setLeaderEpoch(leaderEpoch).
            setPartitionEpoch(partitionEpoch), (short) 0);
    }

    public LeaderAndIsrPartitionState toLeaderAndIsrPartitionState(TopicPartition tp,
                                                                   boolean isNew) {
        return new LeaderAndIsrPartitionState().
            setTopicName(tp.topic()).
            setPartitionIndex(tp.partition()).
            setControllerEpoch(-1).
            setLeader(leader).
            setLeaderEpoch(leaderEpoch).
            setIsr(Replicas.toList(isr)).
            setPartitionEpoch(partitionEpoch).
            setReplicas(Replicas.toList(replicas)).
            setAddingReplicas(Replicas.toList(addingReplicas)).
            setRemovingReplicas(Replicas.toList(removingReplicas)).
            setLeaderRecoveryState(leaderRecoveryState.value()).
            setIsNew(isNew);
    }

    /**
     * Returns true if this partition is reassigning.
     */
    public boolean isReassigning() {
        return removingReplicas.length > 0 || addingReplicas.length > 0;
    }

    @Override
    public int hashCode() {
        return Objects.hash(replicas, isr, removingReplicas, addingReplicas, leader, leaderRecoveryState,
            leaderEpoch, partitionEpoch);
    }

    @Override
    public boolean equals(Object o) {
        if (!(o instanceof PartitionRegistration)) return false;
        PartitionRegistration other = (PartitionRegistration) o;
        return Arrays.equals(replicas, other.replicas) &&
            Arrays.equals(isr, other.isr) &&
            Arrays.equals(removingReplicas, other.removingReplicas) &&
            Arrays.equals(addingReplicas, other.addingReplicas) &&
            leader == other.leader &&
            leaderRecoveryState == other.leaderRecoveryState &&
            leaderEpoch == other.leaderEpoch &&
            partitionEpoch == other.partitionEpoch;
    }

    @Override
    public String toString() {
        StringBuilder builder = new StringBuilder("PartitionRegistration(");
        builder.append("replicas=").append(Arrays.toString(replicas));
        builder.append(", isr=").append(Arrays.toString(isr));
        builder.append(", removingReplicas=").append(Arrays.toString(removingReplicas));
        builder.append(", addingReplicas=").append(Arrays.toString(addingReplicas));
        builder.append(", leader=").append(leader);
        builder.append(", leaderRecoveryState=").append(leaderRecoveryState);
        builder.append(", leaderEpoch=").append(leaderEpoch);
        builder.append(", partitionEpoch=").append(partitionEpoch);
        builder.append(")");
        return builder.toString();
    }
}

相关信息

kafka 源码目录

相关文章

kafka BrokerHeartbeatReply 源码

kafka BrokerRegistration 源码

kafka BrokerRegistrationFencingChange 源码

kafka BrokerRegistrationInControlledShutdownChange 源码

kafka BrokerRegistrationReply 源码

kafka BrokerState 源码

kafka ConfigSynonym 源码

kafka FinalizedControllerFeatures 源码

kafka KafkaConfigSchema 源码

kafka LeaderConstants 源码

0  赞