| /** |
| * 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.hadoop.mapred; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.ipc.VersionedProtocol; |
| import org.apache.hadoop.security.KerberosInfo; |
| |
| /** |
| * Protocol for admin operations. This is a framework-public interface and is |
| * NOT_TO_BE_USED_BY_USERS_DIRECTLY. |
| */ |
| @KerberosInfo( |
| serverPrincipal = JobTracker.JT_USER_NAME) |
| public interface AdminOperationsProtocol extends VersionedProtocol { |
| |
| /** |
| * Version 1: Initial version. Added refreshQueueAcls. |
| * Version 2: Added node refresh facility |
| * Version 3: Changed refreshQueueAcls to refreshQueues |
| */ |
| public static final long versionID = 3L; |
| |
| /** |
| * Refresh the queue acls in use currently. |
| * Refresh the queues used by the jobtracker and scheduler. |
| * |
| * Access control lists and queue states are refreshed. |
| */ |
| void refreshQueues() throws IOException; |
| |
| /** |
| * Refresh the node list at the {@link JobTracker} |
| */ |
| void refreshNodes() throws IOException; |
| |
| /** |
| * Set safe mode for the JobTracker. |
| * @param safeModeAction safe mode action |
| * @return current safemode |
| * @throws IOException |
| */ |
| boolean setSafeMode(JobTracker.SafeModeAction safeModeAction) |
| throws IOException; |
| } |