PriviledgedActionException as:Administrator cause:java.io.IOException

在windows下用Eclipse运行MapReduce程序会报错:

12/04/24 15:32:44 WARN util.NativeCodeLoader: Unable to load native-hadoop     library for your platform... using builtin-java classes where applicable
12/04/24 15:32:44 ERROR security.UserGroupInformation:     PriviledgedActionException as:Administrator cause:java.io.IOException: Failed to set     permissions of path: \tmp\hadoop-Administrator\mapred\staging\Administrator-    519341271\.staging to 0700
Exception in thread "main" java.io.IOException: Failed to set permissions of path: \tmp\hadoop-Administrator\mapred\staging\Administrator-519341271\.staging to 0700

这个问题在网上很常见了, 搜下有很多, 原因和解决方案:

这个是Windows下文件权限问题，在Linux下可以正常运行，不存在这样的问题。

解决方法是将hadoop-x.x.x/src/core/org/apache/hadoop/fs/FileUtil.java里面方法checkReturnValue的代码注释掉.

再重新编译生成hadoop-x.x.x-core.jar.

关键问题是怎么重新编译? 于是网上找怎么编译Hadoop的方法, 本来一个很简单的问题弄了很久都没解决掉.

其实方法很简单, 不用重新编译Hadoop, 仅编译FileUtil.java即可.

新建一个MapReduce项目, 把hadoop-x.x.x/src/core/org/apache/hadoop/fs/FileUtil.java代码复制到src下(注意, 目录结构也需要), 按上面修改文件, 然后重新build下, 找到编译好的.class(两个), 用解压软件打开hadoop-x.x.x-core.jar, 把这两个class文件覆盖即可.

FileUtil.java代码：

package org.apache.hadoop.fs;
/*** 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.*/import java.io.*;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.permission.FsAction;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.io.nativeio.NativeIO;
import org.apache.hadoop.util.StringUtils;
import org.apache.hadoop.util.Shell;
import org.apache.hadoop.util.Shell.ShellCommandExecutor;/*** A collection of file-processing util methods*/
public class FileUtil {private static final Log LOG = LogFactory.getLog(FileUtil.class);/*** convert an array of FileStatus to an array of Path* * @param stats*          an array of FileStatus objects* @return an array of paths corresponding to the input*/public static Path[] stat2Paths(FileStatus[] stats) {if (stats == null)return null;Path[] ret = new Path[stats.length];for (int i = 0; i < stats.length; ++i) {ret[i] = stats[i].getPath();}return ret;}/*** convert an array of FileStatus to an array of Path.* If stats if null, return path* @param stats*          an array of FileStatus objects* @param path*          default path to return in stats is null* @return an array of paths corresponding to the input*/public static Path[] stat2Paths(FileStatus[] stats, Path path) {if (stats == null)return new Path[]{path};elsereturn stat2Paths(stats);}/*** Delete a directory and all its contents.  If* we return false, the directory may be partially-deleted.*/public static boolean fullyDelete(File dir) throws IOException {if (!fullyDeleteContents(dir)) {return false;}return dir.delete();}/*** Delete the contents of a directory, not the directory itself.  If* we return false, the directory may be partially-deleted.*/public static boolean fullyDeleteContents(File dir) throws IOException {boolean deletionSucceeded = true;File contents[] = dir.listFiles();if (contents != null) {for (int i = 0; i < contents.length; i++) {if (contents[i].isFile()) {if (!contents[i].delete()) {deletionSucceeded = false;continue; // continue deletion of other files/dirs under dir}} else {//try deleting the directory// this might be a symlinkboolean b = false;b = contents[i].delete();if (b){//this was indeed a symlink or an empty directorycontinue;}// if not an empty directory or symlink let// fullydelete handle it.if (!fullyDelete(contents[i])) {deletionSucceeded = false;continue; // continue deletion of other files/dirs under dir}}}}return deletionSucceeded;}/*** Recursively delete a directory.* * @param fs {@link FileSystem} on which the path is present* @param dir directory to recursively delete * @throws IOException* @deprecated Use {@link FileSystem#delete(Path, boolean)}*/@Deprecatedpublic static void fullyDelete(FileSystem fs, Path dir) throws IOException {fs.delete(dir, true);}//// If the destination is a subdirectory of the source, then// generate exception//private static void checkDependencies(FileSystem srcFS, Path src, FileSystem dstFS, Path dst)throws IOException {if (srcFS == dstFS) {String srcq = src.makeQualified(srcFS).toString() + Path.SEPARATOR;String dstq = dst.makeQualified(dstFS).toString() + Path.SEPARATOR;if (dstq.startsWith(srcq)) {if (srcq.length() == dstq.length()) {throw new IOException("Cannot copy " + src + " to itself.");} else {throw new IOException("Cannot copy " + src + " to its subdirectory " +dst);}}}}/** Copy files between FileSystems. */public static boolean copy(FileSystem srcFS, Path src, FileSystem dstFS, Path dst, boolean deleteSource,Configuration conf) throws IOException {return copy(srcFS, src, dstFS, dst, deleteSource, true, conf);}public static boolean copy(FileSystem srcFS, Path[] srcs, FileSystem dstFS, Path dst,boolean deleteSource, boolean overwrite, Configuration conf)throws IOException {boolean gotException = false;boolean returnVal = true;StringBuffer exceptions = new StringBuffer();if (srcs.length == 1)return copy(srcFS, srcs[0], dstFS, dst, deleteSource, overwrite, conf);// Check if dest is directoryif (!dstFS.exists(dst)) {throw new IOException("`" + dst +"': specified destination directory " +"doest not exist");} else {FileStatus sdst = dstFS.getFileStatus(dst);if (!sdst.isDir()) throw new IOException("copying multiple files, but last argument `" +dst + "' is not a directory");}for (Path src : srcs) {try {if (!copy(srcFS, src, dstFS, dst, deleteSource, overwrite, conf))returnVal = false;} catch (IOException e) {gotException = true;exceptions.append(e.getMessage());exceptions.append("\n");}}if (gotException) {throw new IOException(exceptions.toString());}return returnVal;}/** Copy files between FileSystems. */public static boolean copy(FileSystem srcFS, Path src, FileSystem dstFS, Path dst, boolean deleteSource,boolean overwrite,Configuration conf) throws IOException {dst = checkDest(src.getName(), dstFS, dst, overwrite);if (srcFS.getFileStatus(src).isDir()) {checkDependencies(srcFS, src, dstFS, dst);if (!dstFS.mkdirs(dst)) {return false;}FileStatus contents[] = srcFS.listStatus(src);for (int i = 0; i < contents.length; i++) {copy(srcFS, contents[i].getPath(), dstFS, new Path(dst, contents[i].getPath().getName()),deleteSource, overwrite, conf);}} else if (srcFS.isFile(src)) {InputStream in=null;OutputStream out = null;try {in = srcFS.open(src);out = dstFS.create(dst, overwrite);IOUtils.copyBytes(in, out, conf, true);} catch (IOException e) {IOUtils.closeStream(out);IOUtils.closeStream(in);throw e;}} else {throw new IOException(src.toString() + ": No such file or directory");}if (deleteSource) {return srcFS.delete(src, true);} else {return true;}}/** Copy all files in a directory to one output file (merge). */public static boolean copyMerge(FileSystem srcFS, Path srcDir, FileSystem dstFS, Path dstFile, boolean deleteSource,Configuration conf, String addString) throws IOException {dstFile = checkDest(srcDir.getName(), dstFS, dstFile, false);if (!srcFS.getFileStatus(srcDir).isDir())return false;OutputStream out = dstFS.create(dstFile);try {FileStatus contents[] = srcFS.listStatus(srcDir);for (int i = 0; i < contents.length; i++) {if (!contents[i].isDir()) {InputStream in = srcFS.open(contents[i].getPath());try {IOUtils.copyBytes(in, out, conf, false);if (addString!=null)out.write(addString.getBytes("UTF-8"));} finally {in.close();} }}} finally {out.close();}if (deleteSource) {return srcFS.delete(srcDir, true);} else {return true;}}  /** Copy local files to a FileSystem. */public static boolean copy(File src,FileSystem dstFS, Path dst,boolean deleteSource,Configuration conf) throws IOException {dst = checkDest(src.getName(), dstFS, dst, false);if (src.isDirectory()) {if (!dstFS.mkdirs(dst)) {return false;}File contents[] = listFiles(src);for (int i = 0; i < contents.length; i++) {copy(contents[i], dstFS, new Path(dst, contents[i].getName()),deleteSource, conf);}} else if (src.isFile()) {InputStream in = null;OutputStream out =null;try {in = new FileInputStream(src);out = dstFS.create(dst);IOUtils.copyBytes(in, out, conf);} catch (IOException e) {IOUtils.closeStream( out );IOUtils.closeStream( in );throw e;}} else {throw new IOException(src.toString() + ": No such file or directory");}if (deleteSource) {return FileUtil.fullyDelete(src);} else {return true;}}/** Copy FileSystem files to local files. */public static boolean copy(FileSystem srcFS, Path src, File dst, boolean deleteSource,Configuration conf) throws IOException {if (srcFS.getFileStatus(src).isDir()) {if (!dst.mkdirs()) {return false;}FileStatus contents[] = srcFS.listStatus(src);for (int i = 0; i < contents.length; i++) {copy(srcFS, contents[i].getPath(), new File(dst, contents[i].getPath().getName()),deleteSource, conf);}} else if (srcFS.isFile(src)) {InputStream in = srcFS.open(src);IOUtils.copyBytes(in, new FileOutputStream(dst), conf);} else {throw new IOException(src.toString() + ": No such file or directory");}if (deleteSource) {return srcFS.delete(src, true);} else {return true;}}private static Path checkDest(String srcName, FileSystem dstFS, Path dst,boolean overwrite) throws IOException {if (dstFS.exists(dst)) {FileStatus sdst = dstFS.getFileStatus(dst);if (sdst.isDir()) {if (null == srcName) {throw new IOException("Target " + dst + " is a directory");}return checkDest(null, dstFS, new Path(dst, srcName), overwrite);} else if (!overwrite) {throw new IOException("Target " + dst + " already exists");}}return dst;}/*** This class is only used on windows to invoke the cygpath command.*/private static class CygPathCommand extends Shell {String[] command;String result;CygPathCommand(String path) throws IOException {command = new String[]{"cygpath", "-u", path};run();}String getResult() throws IOException {return result;}protected String[] getExecString() {return command;}protected void parseExecResult(BufferedReader lines) throws IOException {String line = lines.readLine();if (line == null) {throw new IOException("Can't convert '" + command[2] + " to a cygwin path");}result = line;}}/*** Convert a os-native filename to a path that works for the shell.* @param filename The filename to convert* @return The unix pathname* @throws IOException on windows, there can be problems with the subprocess*/public static String makeShellPath(String filename) throws IOException {if (Path.WINDOWS) {return new CygPathCommand(filename).getResult();} else {return filename;}    }/*** Convert a os-native filename to a path that works for the shell.* @param file The filename to convert* @return The unix pathname* @throws IOException on windows, there can be problems with the subprocess*/public static String makeShellPath(File file) throws IOException {return makeShellPath(file, false);}/*** Convert a os-native filename to a path that works for the shell.* @param file The filename to convert* @param makeCanonicalPath *          Whether to make canonical path for the file passed* @return The unix pathname* @throws IOException on windows, there can be problems with the subprocess*/public static String makeShellPath(File file, boolean makeCanonicalPath) throws IOException {if (makeCanonicalPath) {return makeShellPath(file.getCanonicalPath());} else {return makeShellPath(file.toString());}}/*** Takes an input dir and returns the du on that local directory. Very basic* implementation.* * @param dir*          The input dir to get the disk space of this local dir* @return The total disk space of the input local directory*/public static long getDU(File dir) {long size = 0;if (!dir.exists())return 0;if (!dir.isDirectory()) {return dir.length();} else {File[] allFiles = dir.listFiles();if(allFiles != null) {for (int i = 0; i < allFiles.length; i++) {boolean isSymLink;try {isSymLink = org.apache.commons.io.FileUtils.isSymlink(allFiles[i]);} catch(IOException ioe) {isSymLink = true;}if(!isSymLink) {size += getDU(allFiles[i]);}}}return size;}}/*** Given a File input it will unzip the file in a the unzip directory* passed as the second parameter* @param inFile The zip file as input* @param unzipDir The unzip directory where to unzip the zip file.* @throws IOException*/public static void unZip(File inFile, File unzipDir) throws IOException {Enumeration<? extends ZipEntry> entries;ZipFile zipFile = new ZipFile(inFile);try {entries = zipFile.entries();while (entries.hasMoreElements()) {ZipEntry entry = entries.nextElement();if (!entry.isDirectory()) {InputStream in = zipFile.getInputStream(entry);try {File file = new File(unzipDir, entry.getName());if (!file.getParentFile().mkdirs()) {           if (!file.getParentFile().isDirectory()) {throw new IOException("Mkdirs failed to create " + file.getParentFile().toString());}}OutputStream out = new FileOutputStream(file);try {byte[] buffer = new byte[8192];int i;while ((i = in.read(buffer)) != -1) {out.write(buffer, 0, i);}} finally {out.close();}} finally {in.close();}}}} finally {zipFile.close();}}/*** Given a Tar File as input it will untar the file in a the untar directory* passed as the second parameter* * This utility will untar ".tar" files and ".tar.gz","tgz" files.*  * @param inFile The tar file as input. * @param untarDir The untar directory where to untar the tar file.* @throws IOException*/public static void unTar(File inFile, File untarDir) throws IOException {if (!untarDir.mkdirs()) {           if (!untarDir.isDirectory()) {throw new IOException("Mkdirs failed to create " + untarDir);}}StringBuffer untarCommand = new StringBuffer();boolean gzipped = inFile.toString().endsWith("gz");if (gzipped) {untarCommand.append(" gzip -dc '");untarCommand.append(FileUtil.makeShellPath(inFile));untarCommand.append("' | (");} untarCommand.append("cd '");untarCommand.append(FileUtil.makeShellPath(untarDir)); untarCommand.append("' ; ");untarCommand.append("tar -xf ");if (gzipped) {untarCommand.append(" -)");} else {untarCommand.append(FileUtil.makeShellPath(inFile));}String[] shellCmd = { "bash", "-c", untarCommand.toString() };ShellCommandExecutor shexec = new ShellCommandExecutor(shellCmd);shexec.execute();int exitcode = shexec.getExitCode();if (exitcode != 0) {throw new IOException("Error untarring file " + inFile + ". Tar process exited with exit code " + exitcode);}}/*** Create a soft link between a src and destination* only on a local disk. HDFS does not support this* @param target the target for symlink * @param linkname the symlink* @return value returned by the command*/public static int symLink(String target, String linkname) throws IOException{String cmd = "ln -s " + target + " " + linkname;Process p = Runtime.getRuntime().exec(cmd, null);int returnVal = -1;try{returnVal = p.waitFor();} catch(InterruptedException e){//do nothing as of yet}if (returnVal != 0) {LOG.warn("Command '" + cmd + "' failed " + returnVal + " with: " + copyStderr(p));}return returnVal;}private static String copyStderr(Process p) throws IOException {InputStream err = p.getErrorStream();StringBuilder result = new StringBuilder();byte[] buff = new byte[4096];int len = err.read(buff);while (len > 0) {result.append(new String(buff, 0 , len));len = err.read(buff);}return result.toString();}/*** Change the permissions on a filename.* @param filename the name of the file to change* @param perm the permission string* @return the exit code from the command* @throws IOException* @throws InterruptedException*/public static int chmod(String filename, String perm) throws IOException, InterruptedException {return chmod(filename, perm, false);}/*** Change the permissions on a file / directory, recursively, if* needed.* @param filename name of the file whose permissions are to change* @param perm permission string* @param recursive true, if permissions should be changed recursively* @return the exit code from the command.* @throws IOException* @throws InterruptedException*/public static int chmod(String filename, String perm, boolean recursive)throws IOException {StringBuffer cmdBuf = new StringBuffer();cmdBuf.append("chmod ");if (recursive) {cmdBuf.append("-R ");}cmdBuf.append(perm).append(" ");cmdBuf.append(filename);String[] shellCmd = {"bash", "-c" ,cmdBuf.toString()};ShellCommandExecutor shExec = new ShellCommandExecutor(shellCmd);try {shExec.execute();}catch(IOException e) {if(LOG.isDebugEnabled()) {LOG.debug("Error while changing permission : " + filename +" Exception: " + StringUtils.stringifyException(e));}}return shExec.getExitCode();}/*** Set permissions to the required value. Uses the java primitives instead* of forking if group == other.* @param f the file to change* @param permission the new permissions* @throws IOException*/public static void setPermission(File f, FsPermission permission) throws IOException {FsAction user = permission.getUserAction();FsAction group = permission.getGroupAction();FsAction other = permission.getOtherAction();// use the native/fork if the group/other permissions are different// or if the native is available    if (group != other || NativeIO.isAvailable()) {execSetPermission(f, permission);return;}boolean rv = true;// read permsrv = f.setReadable(group.implies(FsAction.READ), false);checkReturnValue(rv, f, permission);if (group.implies(FsAction.READ) != user.implies(FsAction.READ)) {f.setReadable(user.implies(FsAction.READ), true);checkReturnValue(rv, f, permission);}// write permsrv = f.setWritable(group.implies(FsAction.WRITE), false);checkReturnValue(rv, f, permission);if (group.implies(FsAction.WRITE) != user.implies(FsAction.WRITE)) {f.setWritable(user.implies(FsAction.WRITE), true);checkReturnValue(rv, f, permission);}// exec permsrv = f.setExecutable(group.implies(FsAction.EXECUTE), false);checkReturnValue(rv, f, permission);if (group.implies(FsAction.EXECUTE) != user.implies(FsAction.EXECUTE)) {f.setExecutable(user.implies(FsAction.EXECUTE), true);checkReturnValue(rv, f, permission);}}private static void checkReturnValue(boolean rv, File p, FsPermission permission) throws IOException {}private static void execSetPermission(File f, FsPermission permission)  throws IOException {if (NativeIO.isAvailable()) {NativeIO.chmod(f.getCanonicalPath(), permission.toShort());} else {execCommand(f, Shell.SET_PERMISSION_COMMAND,String.format("%04o", permission.toShort()));}}static String execCommand(File f, String... cmd) throws IOException {String[] args = new String[cmd.length + 1];System.arraycopy(cmd, 0, args, 0, cmd.length);args[cmd.length] = f.getCanonicalPath();String output = Shell.execCommand(args);return output;}/*** Create a tmp file for a base file.* @param basefile the base file of the tmp* @param prefix file name prefix of tmp* @param isDeleteOnExit if true, the tmp will be deleted when the VM exits* @return a newly created tmp file* @exception IOException If a tmp file cannot created* @see java.io.File#createTempFile(String, String, File)* @see java.io.File#deleteOnExit()*/public static final File createLocalTempFile(final File basefile,final String prefix,final boolean isDeleteOnExit)throws IOException {File tmp = File.createTempFile(prefix + basefile.getName(),"", basefile.getParentFile());if (isDeleteOnExit) {tmp.deleteOnExit();}return tmp;}/*** Move the src file to the name specified by target.* @param src the source file* @param target the target file* @exception IOException If this operation fails*/public static void replaceFile(File src, File target) throws IOException {/* renameTo() has two limitations on Windows platform.* src.renameTo(target) fails if* 1) If target already exists OR* 2) If target is already open for reading/writing.*/if (!src.renameTo(target)) {int retries = 5;while (target.exists() && !target.delete() && retries-- >= 0) {try {Thread.sleep(1000);} catch (InterruptedException e) {throw new IOException("replaceFile interrupted.");}}if (!src.renameTo(target)) {throw new IOException("Unable to rename " + src +" to " + target);}}}/*** A wrapper for {@link File#listFiles()}. This java.io API returns null * when a dir is not a directory or for any I/O error. Instead of having* null check everywhere File#listFiles() is used, we will add utility API* to get around this problem. For the majority of cases where we prefer * an IOException to be thrown.* @param dir directory for which listing should be performed* @return list of files or empty list* @exception IOException for invalid directory or for a bad disk.*/public static File[] listFiles(File dir) throws IOException {File[] files = dir.listFiles();if(files == null) {throw new IOException("Invalid directory or I/O error occurred for dir: "+ dir.toString());}return files;}/*** A wrapper for {@link File#list()}. This java.io API returns null * when a dir is not a directory or for any I/O error. Instead of having* null check everywhere File#list() is used, we will add utility API* to get around this problem. For the majority of cases where we prefer * an IOException to be thrown.* @param dir directory for which listing should be performed* @return list of file names or empty string list* @exception IOException for invalid directory or for a bad disk.*/public static String[] list(File dir) throws IOException {String[] fileNames = dir.list();if(fileNames == null) {throw new IOException("Invalid directory or I/O error occurred for dir: "+ dir.toString());}return fileNames;}
}

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