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KAFKA-2371: Add distributed support for Copycat.
This adds coordination between DistributedHerders using the generalized consumer support, allowing automatic balancing of connectors and tasks across workers. A few pieces that require interaction between workers (resolving config inconsistencies, forwarding of configuration changes to the leader worker) are incomplete because they require REST API support to implement properly. Author: Ewen Cheslack-Postava <me@ewencp.org> Reviewers: Jason Gustafson, Gwen Shapira Closes apache#321 from ewencp/kafka-2371-distributed-herder
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54 changes: 54 additions & 0 deletions
54
clients/src/main/java/org/apache/kafka/common/utils/CircularIterator.java
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|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| /** | ||
| * 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. | ||
| **/ | ||
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| package org.apache.kafka.common.utils; | ||
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| import java.util.Iterator; | ||
| import java.util.List; | ||
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| public class CircularIterator<T> implements Iterator<T> { | ||
| int i = 0; | ||
| private List<T> list; | ||
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| public CircularIterator(List<T> list) { | ||
| if (list.isEmpty()) { | ||
| throw new IllegalArgumentException("CircularIterator can only be used on non-empty lists"); | ||
| } | ||
| this.list = list; | ||
| } | ||
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| @Override | ||
| public boolean hasNext() { | ||
| return true; | ||
| } | ||
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| @Override | ||
| public T next() { | ||
| T next = list.get(i); | ||
| i = (i + 1) % list.size(); | ||
| return next; | ||
| } | ||
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| public T peek() { | ||
| return list.get(i); | ||
| } | ||
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| @Override | ||
| public void remove() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
| } |
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54 changes: 54 additions & 0 deletions
54
copycat/runtime/src/main/java/org/apache/kafka/copycat/runtime/TaskConfig.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| /** | ||
| * 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. | ||
| **/ | ||
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| package org.apache.kafka.copycat.runtime; | ||
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| import org.apache.kafka.common.config.AbstractConfig; | ||
| import org.apache.kafka.common.config.ConfigDef; | ||
| import org.apache.kafka.common.config.ConfigDef.Importance; | ||
| import org.apache.kafka.common.config.ConfigDef.Type; | ||
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| import java.util.HashMap; | ||
| import java.util.Map; | ||
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| /** | ||
| * <p> | ||
| * Configuration options for Tasks. These only include Copycat system-level configuration | ||
| * options. | ||
| * </p> | ||
| */ | ||
| public class TaskConfig extends AbstractConfig { | ||
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| public static final String TASK_CLASS_CONFIG = "task.class"; | ||
| private static final String TASK_CLASS_DOC = | ||
| "Name of the class for this task. Must be a subclass of org.apache.kafka.copycat.connector.Task"; | ||
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| private static ConfigDef config; | ||
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| static { | ||
| config = new ConfigDef() | ||
| .define(TASK_CLASS_CONFIG, Type.CLASS, Importance.HIGH, TASK_CLASS_DOC); | ||
| } | ||
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| public TaskConfig() { | ||
| this(new HashMap<String, String>()); | ||
| } | ||
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| public TaskConfig(Map<String, ?> props) { | ||
| super(config, props); | ||
| } | ||
| } |
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