| /** |
| * 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.nodemanager; |
| |
| import java.io.File; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.ListIterator; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.util.DiskChecker; |
| import org.apache.hadoop.util.DiskChecker.DiskErrorException; |
| |
| /** |
| * Manages a list of local storage directories. |
| */ |
| class DirectoryCollection { |
| private static final Log LOG = LogFactory.getLog(DirectoryCollection.class); |
| |
| // Good local storage directories |
| private List<String> localDirs; |
| private List<String> failedDirs; |
| private int numFailures; |
| |
| public DirectoryCollection(String[] dirs) { |
| localDirs = new ArrayList<String>(); |
| localDirs.addAll(Arrays.asList(dirs)); |
| failedDirs = new ArrayList<String>(); |
| } |
| |
| /** |
| * @return the current valid directories |
| */ |
| synchronized List<String> getGoodDirs() { |
| return localDirs; |
| } |
| |
| /** |
| * @return the failed directories |
| */ |
| synchronized List<String> getFailedDirs() { |
| return failedDirs; |
| } |
| |
| /** |
| * @return total the number of directory failures seen till now |
| */ |
| synchronized int getNumFailures() { |
| return numFailures; |
| } |
| |
| /** |
| * Check the health of current set of local directories, updating the list |
| * of valid directories if necessary. |
| * @return <em>true</em> if there is a new disk-failure identified in |
| * this checking. <em>false</em> otherwise. |
| */ |
| synchronized boolean checkDirs() { |
| int oldNumFailures = numFailures; |
| ListIterator<String> it = localDirs.listIterator(); |
| while (it.hasNext()) { |
| final String dir = it.next(); |
| try { |
| DiskChecker.checkDir(new File(dir)); |
| } catch (DiskErrorException de) { |
| LOG.warn("Directory " + dir + " error " + |
| de.getMessage() + ", removing from the list of valid directories."); |
| it.remove(); |
| failedDirs.add(dir); |
| numFailures++; |
| } |
| } |
| if (numFailures > oldNumFailures) { |
| return true; |
| } |
| return false; |
| } |
| } |