kafka RemoteLogMetadataTopicPartitioner 源码
kafka RemoteLogMetadataTopicPartitioner 代码
文件路径：/storage/src/main/java/org/apache/kafka/server/log/remote/metadata/storage/RemoteLogMetadataTopicPartitioner.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.server.log.remote.metadata.storage;
import org.apache.kafka.common.TopicIdPartition;
import org.apache.kafka.common.utils.Utils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Objects;
public class RemoteLogMetadataTopicPartitioner {
public static final Logger log = LoggerFactory.getLogger(RemoteLogMetadataTopicPartitioner.class);
private final int numMetadataTopicPartitions;
public RemoteLogMetadataTopicPartitioner(int numMetadataTopicPartitions) {
this.numMetadataTopicPartitions = numMetadataTopicPartitions;
}
public int metadataPartition(TopicIdPartition topicIdPartition) {
Objects.requireNonNull(topicIdPartition, "TopicPartition can not be null");
int partitionNum = Utils.toPositive(Utils.murmur2(toBytes(topicIdPartition))) % numMetadataTopicPartitions;
log.debug("No of partitions [{}], partitionNum: [{}] for given topic: [{}]", numMetadataTopicPartitions, partitionNum, topicIdPartition);
return partitionNum;
}
private byte[] toBytes(TopicIdPartition topicIdPartition) {
// We do not want to depend upon hash code generation of Uuid as that may change.
int hash = Objects.hash(topicIdPartition.topicId().getLeastSignificantBits(),
topicIdPartition.topicId().getMostSignificantBits(),
topicIdPartition.partition());
return toBytes(hash);
}
private byte[] toBytes(int n) {
return new byte[]{
(byte) (n >> 24),
(byte) (n >> 16),
(byte) (n >> 8),
(byte) n
};
}
}
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