| /** |
| * 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.yarn.server.resourcemanager.scheduler.capacity.conf; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.yarn.server.records.Version; |
| import org.apache.hadoop.yarn.server.resourcemanager.RMContext; |
| |
| import java.io.IOException; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * A default implementation of {@link YarnConfigurationStore}. Doesn't offer |
| * persistent configuration storage, just stores the configuration in memory. |
| */ |
| public class InMemoryConfigurationStore extends YarnConfigurationStore { |
| |
| private Configuration schedConf; |
| private long configVersion; |
| |
| @Override |
| public void initialize(Configuration conf, Configuration schedConf, |
| RMContext rmContext) { |
| this.schedConf = schedConf; |
| this.configVersion = 1L; |
| } |
| |
| /** |
| * This method does not log as it does not support backing store. |
| * The mutation to be applied on top of schedConf will be directly passed |
| * in confirmMutation. |
| */ |
| @Override |
| public void logMutation(LogMutation logMutation) { |
| } |
| |
| @Override |
| public void confirmMutation(LogMutation pendingMutation, boolean isValid) { |
| if (isValid) { |
| for (Map.Entry<String, String> kv : pendingMutation.getUpdates() |
| .entrySet()) { |
| if (kv.getValue() == null) { |
| schedConf.unset(kv.getKey()); |
| } else { |
| schedConf.set(kv.getKey(), kv.getValue()); |
| } |
| } |
| this.configVersion = this.configVersion + 1L; |
| } |
| } |
| |
| @Override |
| public void format() { |
| this.schedConf = null; |
| } |
| |
| @Override |
| public synchronized Configuration retrieve() { |
| return schedConf; |
| } |
| |
| @Override |
| public long getConfigVersion() { |
| return configVersion; |
| } |
| |
| /** |
| * Configuration mutations not logged (i.e. not persisted) but directly |
| * confirmed. As such, a list of persisted configuration mutations does not |
| * exist. |
| * @return null Configuration mutation list not applicable for this store. |
| */ |
| @Override |
| public List<LogMutation> getConfirmedConfHistory(long fromId) { |
| // Unimplemented. |
| return null; |
| } |
| |
| /** |
| * Configuration mutations not logged (i.e. not persisted) but directly |
| * confirmed. As such, a list of persisted configuration mutations does not |
| * exist. |
| * @return null Configuration mutation list not applicable for this store. |
| */ |
| @Override |
| protected LinkedList<LogMutation> getLogs() { |
| // Unimplemented. |
| return null; |
| } |
| |
| /** |
| * Configuration mutations applied directly in-memory. As such, there is no |
| * persistent configuration store. |
| * As there is no configuration store for versioning purposes, |
| * a conf store version is not applicable. |
| * @return null Conf store version not applicable for this store. |
| * @throws Exception |
| */ |
| @Override |
| public Version getConfStoreVersion() throws Exception { |
| // Does nothing. |
| return null; |
| } |
| |
| /** |
| * Configuration mutations not logged (i.e. not persisted). As such, they are |
| * not persisted and not versioned. Hence, no version information to store. |
| * @throws Exception |
| */ |
| @Override |
| public void storeVersion() throws Exception { |
| // Does nothing. |
| } |
| |
| /** |
| * Configuration mutations not logged (i.e. not persisted). As such, they are |
| * not persisted and not versioned. Hence, a current version is not |
| * applicable. |
| * @return null A current version not applicable for this store. |
| */ |
| @Override |
| public Version getCurrentVersion() { |
| // Does nothing. |
| return null; |
| } |
| |
| /** |
| * Configuration mutations not logged (i.e. not persisted). As such, they are |
| * not persisted and not versioned. Hence, version is always compatible, |
| * since it is in-memory. |
| */ |
| @Override |
| public void checkVersion() { |
| // Does nothing. (Version is always compatible since it's in memory) |
| } |
| |
| @Override |
| public void close() throws IOException { |
| // Does nothing. |
| } |
| } |