| /** |
| * 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.mapreduce.v2.hs; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.mapreduce.v2.jobhistory.JHAdminConfig; |
| import org.apache.hadoop.util.ReflectionUtils; |
| |
| public class HistoryServerStateStoreServiceFactory { |
| |
| /** |
| * Constructs an instance of the configured storage class |
| * |
| * @param conf the configuration |
| * @return the state storage instance |
| */ |
| public static HistoryServerStateStoreService getStore(Configuration conf) { |
| Class<? extends HistoryServerStateStoreService> storeClass = |
| HistoryServerNullStateStoreService.class; |
| boolean recoveryEnabled = conf.getBoolean( |
| JHAdminConfig.MR_HS_RECOVERY_ENABLE, |
| JHAdminConfig.DEFAULT_MR_HS_RECOVERY_ENABLE); |
| if (recoveryEnabled) { |
| storeClass = conf.getClass(JHAdminConfig.MR_HS_STATE_STORE, null, |
| HistoryServerStateStoreService.class); |
| if (storeClass == null) { |
| throw new RuntimeException("Unable to locate storage class, check " |
| + JHAdminConfig.MR_HS_STATE_STORE); |
| } |
| } |
| return ReflectionUtils.newInstance(storeClass, conf); |
| } |
| } |
