kafka FallbackPriorTaskAssignor 源码
kafka FallbackPriorTaskAssignor 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/processor/internals/assignment/FallbackPriorTaskAssignor.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.streams.processor.internals.assignment;
import org.apache.kafka.streams.processor.TaskId;
import org.apache.kafka.streams.processor.internals.assignment.AssignorConfiguration.AssignmentConfigs;
import java.util.Map;
import java.util.Set;
import java.util.UUID;
/**
* A special task assignor implementation to be used as a fallback in case the
* configured assignor couldn't be invoked.
*
* Specifically, this assignor must:
* 1. ignore the task lags in the ClientState map
* 2. always return true, indicating that a follow-up rebalance is needed
*/
public class FallbackPriorTaskAssignor implements TaskAssignor {
private final StickyTaskAssignor delegate;
public FallbackPriorTaskAssignor() {
delegate = new StickyTaskAssignor(true);
}
@Override
public boolean assign(final Map<UUID, ClientState> clients,
final Set<TaskId> allTaskIds,
final Set<TaskId> statefulTaskIds,
final AssignmentConfigs configs) {
delegate.assign(clients, allTaskIds, statefulTaskIds, configs);
return true;
}
}
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