kafka RackAwareReplicaSelector 源码
kafka RackAwareReplicaSelector 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/replica/RackAwareReplicaSelector.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.common.replica;
import org.apache.kafka.common.TopicPartition;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;
/**
* Returns a replica whose rack id is equal to the rack id specified in the client request metadata. If no such replica
* is found, returns the leader.
*/
public class RackAwareReplicaSelector implements ReplicaSelector {
@Override
public Optional<ReplicaView> select(TopicPartition topicPartition,
ClientMetadata clientMetadata,
PartitionView partitionView) {
if (clientMetadata.rackId() != null && !clientMetadata.rackId().isEmpty()) {
Set<ReplicaView> sameRackReplicas = partitionView.replicas().stream()
.filter(replicaInfo -> clientMetadata.rackId().equals(replicaInfo.endpoint().rack()))
.collect(Collectors.toSet());
if (sameRackReplicas.isEmpty()) {
return Optional.of(partitionView.leader());
} else {
if (sameRackReplicas.contains(partitionView.leader())) {
// Use the leader if it's in this rack
return Optional.of(partitionView.leader());
} else {
// Otherwise, get the most caught-up replica
return sameRackReplicas.stream().max(ReplicaView.comparator());
}
}
} else {
return Optional.of(partitionView.leader());
}
}
}
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