drill-yarn/src/main/java/org/apache/drill/yarn/appMaster/RegistryHandler.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.drill.yarn.appMaster;

/**
 * Callback from the ZooKeeper registry to announce events
 * related to Drillbit registration.
 */

public interface RegistryHandler {
  void reserveHost(String hostName);

  void releaseHost(String hostName);

  void startAck(Task task, String propertyKey, Object value);

  void completionAck(Task task, String endpointProperty);

  void registryDown();
}