kafka IdentityReplicationPolicy 源码
kafka IdentityReplicationPolicy 代码
文件路径:/connect/mirror-client/src/main/java/org/apache/kafka/connect/mirror/IdentityReplicationPolicy.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.connect.mirror;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/** IdentityReplicationPolicy does not rename remote topics. This is useful for migrating
* from legacy MM1, or for any use-case involving one-way replication.
*
* N.B. MirrorMaker is not able to prevent cycles when using this class, so take care that
* your replication topology is acyclic. If migrating from MirrorMaker v1, this will likely
* already be the case.
*/
public class IdentityReplicationPolicy extends DefaultReplicationPolicy {
private static final Logger log = LoggerFactory.getLogger(IdentityReplicationPolicy.class);
public static final String SOURCE_CLUSTER_ALIAS_CONFIG = "source.cluster.alias";
private String sourceClusterAlias = null;
@Override
public void configure(Map<String, ?> props) {
super.configure(props);
if (props.containsKey(SOURCE_CLUSTER_ALIAS_CONFIG)) {
sourceClusterAlias = (String) props.get(SOURCE_CLUSTER_ALIAS_CONFIG);
log.info("Using source cluster alias `{}`.", sourceClusterAlias);
}
}
/** Unlike DefaultReplicationPolicy, IdentityReplicationPolicy does not include the source
* cluster alias in the remote topic name. Instead, topic names are unchanged.
*
* In the special case of heartbeats, we defer to DefaultReplicationPolicy.
*/
@Override
public String formatRemoteTopic(String sourceClusterAlias, String topic) {
if (looksLikeHeartbeat(topic)) {
return super.formatRemoteTopic(sourceClusterAlias, topic);
} else {
return topic;
}
}
/** Unlike DefaultReplicationPolicy, IdentityReplicationPolicy cannot know the source of
* a remote topic based on its name alone. If `source.cluster.alias` is provided,
* `topicSource` will return that.
*
* In the special case of heartbeats, we defer to DefaultReplicationPolicy.
*/
@Override
public String topicSource(String topic) {
if (looksLikeHeartbeat(topic)) {
return super.topicSource(topic);
} else {
return sourceClusterAlias;
}
}
/** Since any topic may be a "remote topic", this just returns `topic`.
*
* In the special case of heartbeats, we defer to DefaultReplicationPolicy.
*/
@Override
public String upstreamTopic(String topic) {
if (looksLikeHeartbeat(topic)) {
return super.upstreamTopic(topic);
} else {
return topic;
}
}
private boolean looksLikeHeartbeat(String topic) {
return topic != null && topic.endsWith(heartbeatsTopic());
}
}
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