| /** |
| * 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; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.classification.InterfaceAudience.Private; |
| import org.apache.hadoop.classification.InterfaceStability.Unstable; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.yarn.conf.ConfigurationProvider; |
| import org.apache.hadoop.yarn.conf.YarnConfiguration; |
| import org.apache.hadoop.yarn.exceptions.YarnException; |
| |
| @Private |
| @Unstable |
| public class FileSystemBasedConfigurationProvider |
| extends ConfigurationProvider { |
| |
| private static final Log LOG = LogFactory |
| .getLog(FileSystemBasedConfigurationProvider.class); |
| private FileSystem fs; |
| private Path configDir; |
| |
| @Override |
| public synchronized InputStream getConfigurationInputStream( |
| Configuration bootstrapConf, String name) throws IOException, |
| YarnException { |
| if (name == null || name.isEmpty()) { |
| throw new YarnException( |
| "Illegal argument! The parameter should not be null or empty"); |
| } |
| Path filePath; |
| if (YarnConfiguration.RM_CONFIGURATION_FILES.contains(name)) { |
| filePath = new Path(this.configDir, name); |
| if (!fs.exists(filePath)) { |
| LOG.info(filePath + " not found"); |
| return null; |
| } |
| } else { |
| filePath = new Path(name); |
| if (!fs.exists(filePath)) { |
| LOG.info(filePath + " not found"); |
| return null; |
| } |
| } |
| return fs.open(filePath); |
| } |
| |
| @Override |
| public synchronized void initInternal(Configuration bootstrapConf) |
| throws Exception { |
| configDir = |
| new Path(bootstrapConf.get(YarnConfiguration.FS_BASED_RM_CONF_STORE, |
| YarnConfiguration.DEFAULT_FS_BASED_RM_CONF_STORE)); |
| fs = configDir.getFileSystem(bootstrapConf); |
| if (!fs.exists(configDir)) { |
| fs.mkdirs(configDir); |
| } |
| } |
| |
| @Override |
| public synchronized void closeInternal() throws Exception { |
| fs.close(); |
| } |
| } |