/*
* Copyright 2011-2013 the original author or authors.
*
* Licensed 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.springframework.data.hadoop.util;
import java.lang.reflect.Field;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.mapreduce.JobSubmissionFiles;
import org.springframework.util.ReflectionUtils;
/**
* Simple utility class that fixes the File permission problem on
* Windows. A temporary work-around until Hadoop fixes this issue out of the box.
* Needs to be called, once per class-loader, before submitting a job to Hadoop.
*
* @author Costin Leau
* @author Thomas Risberg
*/
public class PermissionUtils {
private static final Log log = LogFactory.getLog(PermissionUtils.class);
private static Class<?> trackerDistributedCacheManagerClass;
static {
if (System.getProperty("os.name").toLowerCase().startsWith("win")) {
try {
trackerDistributedCacheManagerClass = Class.forName("org.apache.hadoop.filecache.TrackerDistributedCacheManager");
} catch (ClassNotFoundException e) {
trackerDistributedCacheManagerClass = null;
log.warn("Unable to provide Windows jar permission fix: " + e.getMessage());
e.printStackTrace();
}
}
}
public static void hackHadoopStagingOnWin() {
// do the assignment only on Windows systems
if (System.getProperty("os.name").toLowerCase().startsWith("win")) {
// 0655 = -rwxr-xr-x
JobSubmissionFiles.JOB_DIR_PERMISSION.fromShort((short) 0650);
JobSubmissionFiles.JOB_FILE_PERMISSION.fromShort((short) 0650);
if (trackerDistributedCacheManagerClass != null) {
// handle jar permissions as well
Field field = ReflectionUtils.findField(trackerDistributedCacheManagerClass, "PUBLIC_CACHE_OBJECT_PERM");
ReflectionUtils.makeAccessible(field);
FsPermission perm = (FsPermission) ReflectionUtils.getField(field, null);
perm.fromShort((short) 0650);
}
}
}
}