| /** |
| * 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.hdfs.server.namenode; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.net.URI; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.DF; |
| import org.apache.hadoop.hdfs.DFSConfigKeys; |
| import org.apache.hadoop.hdfs.server.common.Util; |
| |
| /** |
| * |
| * NameNodeResourceChecker provides a method - |
| * <code>hasAvailableDiskSpace</code> - which will return true if and only if |
| * the NameNode has disk space available on all volumes which are configured to |
| * be checked. Volumes containing file system name/edits dirs are added by |
| * default, and arbitrary extra volumes may be configured as well. |
| */ |
| public class NameNodeResourceChecker { |
| private static final Log LOG = LogFactory.getLog(NameNodeResourceChecker.class.getName()); |
| |
| // Space (in bytes) reserved per volume. |
| private long duReserved; |
| |
| private final Configuration conf; |
| private Map<String, DF> volumes; |
| |
| /** |
| * Create a NameNodeResourceChecker, which will check the name dirs and edits |
| * dirs set in <code>conf</code>. |
| * |
| * @param conf |
| * @throws IOException |
| */ |
| public NameNodeResourceChecker(Configuration conf) throws IOException { |
| this.conf = conf; |
| volumes = new HashMap<String, DF>(); |
| |
| duReserved = conf.getLong(DFSConfigKeys.DFS_NAMENODE_DU_RESERVED_KEY, |
| DFSConfigKeys.DFS_NAMENODE_DU_RESERVED_DEFAULT); |
| |
| Collection<URI> extraCheckedVolumes = Util.stringCollectionAsURIs(conf |
| .getTrimmedStringCollection(DFSConfigKeys.DFS_NAMENODE_CHECKED_VOLUMES_KEY)); |
| |
| addDirsToCheck(FSNamesystem.getNamespaceDirs(conf)); |
| addDirsToCheck(FSNamesystem.getNamespaceEditsDirs(conf)); |
| addDirsToCheck(extraCheckedVolumes); |
| } |
| |
| /** |
| * Add the passed-in directories to the list of volumes to check. |
| * |
| * @param directoriesToCheck |
| * The directories whose volumes will be checked for available space. |
| * @throws IOException |
| */ |
| private void addDirsToCheck(Collection<URI> directoriesToCheck) |
| throws IOException { |
| for (URI directoryUri : directoriesToCheck) { |
| File dir = new File(directoryUri.getPath()); |
| if (!dir.exists()) { |
| throw new IOException("Missing directory "+dir.getAbsolutePath()); |
| } |
| DF df = new DF(dir, conf); |
| volumes.put(df.getFilesystem(), df); |
| } |
| } |
| |
| /** |
| * Return true if disk space is available on all all the configured volumes. |
| * |
| * @return True if the configured amount of disk space is available on all |
| * volumes, false otherwise. |
| * @throws IOException |
| */ |
| boolean hasAvailableDiskSpace() |
| throws IOException { |
| return getVolumesLowOnSpace().size() == 0; |
| } |
| |
| /** |
| * Return the set of directories which are low on space. |
| * @return the set of directories whose free space is below the threshold. |
| * @throws IOException |
| */ |
| Collection<String> getVolumesLowOnSpace() throws IOException { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Going to check the following volumes disk space: " + volumes); |
| } |
| Collection<String> lowVolumes = new ArrayList<String>(); |
| for (DF volume : volumes.values()) { |
| long availableSpace = volume.getAvailable(); |
| String fileSystem = volume.getFilesystem(); |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Space available on volume '" + fileSystem + "' is " + availableSpace); |
| } |
| if (availableSpace < duReserved) { |
| LOG.warn("Space available on volume '" + fileSystem + "' is " |
| + availableSpace + |
| ", which is below the configured reserved amount " + duReserved); |
| lowVolumes.add(volume.getFilesystem()); |
| } |
| } |
| return lowVolumes; |
| } |
| } |