branch-2.0.4-alpha/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/s3/Jets3tFileSystemStore.java - hadoop - Git at Google

 /**
  * 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.fs.s3;

 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
 import java.io.Closeable;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.net.URI;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;
 import java.util.TreeSet;

 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.s3.INode.FileType;
 import org.jets3t.service.S3Service;
 import org.jets3t.service.S3ServiceException;
 import org.jets3t.service.impl.rest.httpclient.RestS3Service;
 import org.jets3t.service.model.S3Bucket;
 import org.jets3t.service.model.S3Object;
 import org.jets3t.service.security.AWSCredentials;

 @InterfaceAudience.Private
 @InterfaceStability.Unstable
 class Jets3tFileSystemStore implements FileSystemStore {

   private static final String FILE_SYSTEM_NAME = "fs";
   private static final String FILE_SYSTEM_VALUE = "Hadoop";

   private static final String FILE_SYSTEM_TYPE_NAME = "fs-type";
   private static final String FILE_SYSTEM_TYPE_VALUE = "block";

   private static final String FILE_SYSTEM_VERSION_NAME = "fs-version";
   private static final String FILE_SYSTEM_VERSION_VALUE = "1";

   private static final Map<String, String> METADATA =
     new HashMap<String, String>();

   static {
     METADATA.put(FILE_SYSTEM_NAME, FILE_SYSTEM_VALUE);
     METADATA.put(FILE_SYSTEM_TYPE_NAME, FILE_SYSTEM_TYPE_VALUE);
     METADATA.put(FILE_SYSTEM_VERSION_NAME, FILE_SYSTEM_VERSION_VALUE);
   }

   private static final String PATH_DELIMITER = Path.SEPARATOR;
   private static final String BLOCK_PREFIX = "block_";

   private Configuration conf;

   private S3Service s3Service;

   private S3Bucket bucket;

   private int bufferSize;

   private static final Log LOG =
     LogFactory.getLog(Jets3tFileSystemStore.class.getName());

   @Override
   public void initialize(URI uri, Configuration conf) throws IOException {

     this.conf = conf;

     S3Credentials s3Credentials = new S3Credentials();
     s3Credentials.initialize(uri, conf);
     try {
       AWSCredentials awsCredentials =
         new AWSCredentials(s3Credentials.getAccessKey(),
             s3Credentials.getSecretAccessKey());
       this.s3Service = new RestS3Service(awsCredentials);
     } catch (S3ServiceException e) {
       if (e.getCause() instanceof IOException) {
         throw (IOException) e.getCause();
       }
       throw new S3Exception(e);
     }
     bucket = new S3Bucket(uri.getHost());

     this.bufferSize = conf.getInt(
                        S3FileSystemConfigKeys.S3_STREAM_BUFFER_SIZE_KEY,
                        S3FileSystemConfigKeys.S3_STREAM_BUFFER_SIZE_DEFAULT
 		      );
   }

   @Override
   public String getVersion() throws IOException {
     return FILE_SYSTEM_VERSION_VALUE;
   }

   private void delete(String key) throws IOException {
     try {
       s3Service.deleteObject(bucket, key);
     } catch (S3ServiceException e) {
       if (e.getCause() instanceof IOException) {
         throw (IOException) e.getCause();
       }
       throw new S3Exception(e);
     }
   }

   @Override
   public void deleteINode(Path path) throws IOException {
     delete(pathToKey(path));
   }

   @Override
   public void deleteBlock(Block block) throws IOException {
     delete(blockToKey(block));
   }

   @Override
   public boolean inodeExists(Path path) throws IOException {
     InputStream in = get(pathToKey(path), true);
     if (in == null) {
       return false;
     }
     in.close();
     return true;
   }

   @Override
   public boolean blockExists(long blockId) throws IOException {
     InputStream in = get(blockToKey(blockId), false);
     if (in == null) {
       return false;
     }
     in.close();
     return true;
   }

   private InputStream get(String key, boolean checkMetadata)
       throws IOException {

     try {
       S3Object object = s3Service.getObject(bucket, key);
       if (checkMetadata) {
         checkMetadata(object);
       }
       return object.getDataInputStream();
     } catch (S3ServiceException e) {
       if ("NoSuchKey".equals(e.getS3ErrorCode())) {
         return null;
       }
       if (e.getCause() instanceof IOException) {
         throw (IOException) e.getCause();
       }
       throw new S3Exception(e);
     }
   }

   private InputStream get(String key, long byteRangeStart) throws IOException {
     try {
       S3Object object = s3Service.getObject(bucket, key, null, null, null,
                                             null, byteRangeStart, null);
       return object.getDataInputStream();
     } catch (S3ServiceException e) {
       if ("NoSuchKey".equals(e.getS3ErrorCode())) {
         return null;
       }
       if (e.getCause() instanceof IOException) {
         throw (IOException) e.getCause();
       }
       throw new S3Exception(e);
     }
   }

   private void checkMetadata(S3Object object) throws S3FileSystemException,
       S3ServiceException {

     String name = (String) object.getMetadata(FILE_SYSTEM_NAME);
     if (!FILE_SYSTEM_VALUE.equals(name)) {
       throw new S3FileSystemException("Not a Hadoop S3 file.");
     }
     String type = (String) object.getMetadata(FILE_SYSTEM_TYPE_NAME);
     if (!FILE_SYSTEM_TYPE_VALUE.equals(type)) {
       throw new S3FileSystemException("Not a block file.");
     }
     String dataVersion = (String) object.getMetadata(FILE_SYSTEM_VERSION_NAME);
     if (!FILE_SYSTEM_VERSION_VALUE.equals(dataVersion)) {
       throw new VersionMismatchException(FILE_SYSTEM_VERSION_VALUE,
           dataVersion);
     }
   }

   @Override
   public INode retrieveINode(Path path) throws IOException {
     return INode.deserialize(get(pathToKey(path), true));
   }

   @Override
   public File retrieveBlock(Block block, long byteRangeStart)
     throws IOException {
     File fileBlock = null;
     InputStream in = null;
     OutputStream out = null;
     try {
       fileBlock = newBackupFile();
       in = get(blockToKey(block), byteRangeStart);
       out = new BufferedOutputStream(new FileOutputStream(fileBlock));
       byte[] buf = new byte[bufferSize];
       int numRead;
       while ((numRead = in.read(buf)) >= 0) {
         out.write(buf, 0, numRead);
       }
       return fileBlock;
     } catch (IOException e) {
       // close output stream to file then delete file
       closeQuietly(out);
       out = null; // to prevent a second close
       if (fileBlock != null) {
         boolean b = fileBlock.delete();
         if (!b) {
           LOG.warn("Ignoring failed delete");
         }
       }
       throw e;
     } finally {
       closeQuietly(out);
       closeQuietly(in);
     }
   }

   private File newBackupFile() throws IOException {
     File dir = new File(conf.get("fs.s3.buffer.dir"));
     if (!dir.exists() && !dir.mkdirs()) {
       throw new IOException("Cannot create S3 buffer directory: " + dir);
     }
     File result = File.createTempFile("input-", ".tmp", dir);
     result.deleteOnExit();
     return result;
   }

   @Override
   public Set<Path> listSubPaths(Path path) throws IOException {
     try {
       String prefix = pathToKey(path);
       if (!prefix.endsWith(PATH_DELIMITER)) {
         prefix += PATH_DELIMITER;
       }
       S3Object[] objects = s3Service.listObjects(bucket, prefix, PATH_DELIMITER);
       Set<Path> prefixes = new TreeSet<Path>();
       for (int i = 0; i < objects.length; i++) {
         prefixes.add(keyToPath(objects[i].getKey()));
       }
       prefixes.remove(path);
       return prefixes;
     } catch (S3ServiceException e) {
       if (e.getCause() instanceof IOException) {
         throw (IOException) e.getCause();
       }
       throw new S3Exception(e);
     }
   }

   @Override
   public Set<Path> listDeepSubPaths(Path path) throws IOException {
     try {
       String prefix = pathToKey(path);
       if (!prefix.endsWith(PATH_DELIMITER)) {
         prefix += PATH_DELIMITER;
       }
       S3Object[] objects = s3Service.listObjects(bucket, prefix, null);
       Set<Path> prefixes = new TreeSet<Path>();
       for (int i = 0; i < objects.length; i++) {
         prefixes.add(keyToPath(objects[i].getKey()));
       }
       prefixes.remove(path);
       return prefixes;
     } catch (S3ServiceException e) {
       if (e.getCause() instanceof IOException) {
         throw (IOException) e.getCause();
       }
       throw new S3Exception(e);
     }
   }

   private void put(String key, InputStream in, long length, boolean storeMetadata)
       throws IOException {

     try {
       S3Object object = new S3Object(key);
       object.setDataInputStream(in);
       object.setContentType("binary/octet-stream");
       object.setContentLength(length);
       if (storeMetadata) {
         object.addAllMetadata(METADATA);
       }
       s3Service.putObject(bucket, object);
     } catch (S3ServiceException e) {
       if (e.getCause() instanceof IOException) {
         throw (IOException) e.getCause();
       }
       throw new S3Exception(e);
     }
   }

   @Override
   public void storeINode(Path path, INode inode) throws IOException {
     put(pathToKey(path), inode.serialize(), inode.getSerializedLength(), true);
   }

   @Override
   public void storeBlock(Block block, File file) throws IOException {
     BufferedInputStream in = null;
     try {
       in = new BufferedInputStream(new FileInputStream(file));
       put(blockToKey(block), in, block.getLength(), false);
     } finally {
       closeQuietly(in);
     }
   }

   private void closeQuietly(Closeable closeable) {
     if (closeable != null) {
       try {
         closeable.close();
       } catch (IOException e) {
         // ignore
       }
     }
   }

   private String pathToKey(Path path) {
     if (!path.isAbsolute()) {
       throw new IllegalArgumentException("Path must be absolute: " + path);
     }
     return path.toUri().getPath();
   }

   private Path keyToPath(String key) {
     return new Path(key);
   }

   private String blockToKey(long blockId) {
     return BLOCK_PREFIX + blockId;
   }

   private String blockToKey(Block block) {
     return blockToKey(block.getId());
   }

   @Override
   public void purge() throws IOException {
     try {
       S3Object[] objects = s3Service.listObjects(bucket);
       for (int i = 0; i < objects.length; i++) {
         s3Service.deleteObject(bucket, objects[i].getKey());
       }
     } catch (S3ServiceException e) {
       if (e.getCause() instanceof IOException) {
         throw (IOException) e.getCause();
       }
       throw new S3Exception(e);
     }
   }

   @Override
   public void dump() throws IOException {
     StringBuilder sb = new StringBuilder("S3 Filesystem, ");
     sb.append(bucket.getName()).append("\n");
     try {
       S3Object[] objects = s3Service.listObjects(bucket, PATH_DELIMITER, null);
       for (int i = 0; i < objects.length; i++) {
         Path path = keyToPath(objects[i].getKey());
         sb.append(path).append("\n");
         INode m = retrieveINode(path);
         sb.append("\t").append(m.getFileType()).append("\n");
         if (m.getFileType() == FileType.DIRECTORY) {
           continue;
         }
         for (int j = 0; j < m.getBlocks().length; j++) {
           sb.append("\t").append(m.getBlocks()[j]).append("\n");
         }
       }
     } catch (S3ServiceException e) {
       if (e.getCause() instanceof IOException) {
         throw (IOException) e.getCause();
       }
       throw new S3Exception(e);
     }
     System.out.println(sb);
   }

 }
	/**
	* 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.fs.s3;

	import java.io.BufferedInputStream;
	import java.io.BufferedOutputStream;
	import java.io.Closeable;
	import java.io.File;
	import java.io.FileInputStream;
	import java.io.FileOutputStream;
	import java.io.IOException;
	import java.io.InputStream;
	import java.io.OutputStream;
	import java.net.URI;
	import java.util.HashMap;
	import java.util.Map;
	import java.util.Set;
	import java.util.TreeSet;

	import org.apache.commons.logging.Log;
	import org.apache.commons.logging.LogFactory;
	import org.apache.hadoop.classification.InterfaceAudience;
	import org.apache.hadoop.classification.InterfaceStability;
	import org.apache.hadoop.conf.Configuration;
	import org.apache.hadoop.fs.Path;
	import org.apache.hadoop.fs.s3.INode.FileType;
	import org.jets3t.service.S3Service;
	import org.jets3t.service.S3ServiceException;
	import org.jets3t.service.impl.rest.httpclient.RestS3Service;
	import org.jets3t.service.model.S3Bucket;
	import org.jets3t.service.model.S3Object;
	import org.jets3t.service.security.AWSCredentials;

	@InterfaceAudience.Private
	@InterfaceStability.Unstable
	class Jets3tFileSystemStore implements FileSystemStore {

	private static final String FILE_SYSTEM_NAME = "fs";
	private static final String FILE_SYSTEM_VALUE = "Hadoop";

	private static final String FILE_SYSTEM_TYPE_NAME = "fs-type";
	private static final String FILE_SYSTEM_TYPE_VALUE = "block";

	private static final String FILE_SYSTEM_VERSION_NAME = "fs-version";
	private static final String FILE_SYSTEM_VERSION_VALUE = "1";

	private static final Map<String, String> METADATA =
	new HashMap<String, String>();

	static {
	METADATA.put(FILE_SYSTEM_NAME, FILE_SYSTEM_VALUE);
	METADATA.put(FILE_SYSTEM_TYPE_NAME, FILE_SYSTEM_TYPE_VALUE);
	METADATA.put(FILE_SYSTEM_VERSION_NAME, FILE_SYSTEM_VERSION_VALUE);
	}

	private static final String PATH_DELIMITER = Path.SEPARATOR;
	private static final String BLOCK_PREFIX = "block_";

	private Configuration conf;

	private S3Service s3Service;

	private S3Bucket bucket;

	private int bufferSize;

	private static final Log LOG =
	LogFactory.getLog(Jets3tFileSystemStore.class.getName());

	@Override
	public void initialize(URI uri, Configuration conf) throws IOException {

	this.conf = conf;

	S3Credentials s3Credentials = new S3Credentials();
	s3Credentials.initialize(uri, conf);
	try {
	AWSCredentials awsCredentials =
	new AWSCredentials(s3Credentials.getAccessKey(),
	s3Credentials.getSecretAccessKey());
	this.s3Service = new RestS3Service(awsCredentials);
	} catch (S3ServiceException e) {
	if (e.getCause() instanceof IOException) {
	throw (IOException) e.getCause();
	}
	throw new S3Exception(e);
	}
	bucket = new S3Bucket(uri.getHost());

	this.bufferSize = conf.getInt(
	S3FileSystemConfigKeys.S3_STREAM_BUFFER_SIZE_KEY,
	S3FileSystemConfigKeys.S3_STREAM_BUFFER_SIZE_DEFAULT
	);
	}

	@Override
	public String getVersion() throws IOException {
	return FILE_SYSTEM_VERSION_VALUE;
	}

	private void delete(String key) throws IOException {
	try {
	s3Service.deleteObject(bucket, key);
	} catch (S3ServiceException e) {
	if (e.getCause() instanceof IOException) {
	throw (IOException) e.getCause();
	}
	throw new S3Exception(e);
	}
	}

	@Override
	public void deleteINode(Path path) throws IOException {
	delete(pathToKey(path));
	}

	@Override
	public void deleteBlock(Block block) throws IOException {
	delete(blockToKey(block));
	}

	@Override
	public boolean inodeExists(Path path) throws IOException {
	InputStream in = get(pathToKey(path), true);
	if (in == null) {
	return false;
	}
	in.close();
	return true;
	}

	@Override
	public boolean blockExists(long blockId) throws IOException {
	InputStream in = get(blockToKey(blockId), false);
	if (in == null) {
	return false;
	}
	in.close();
	return true;
	}

	private InputStream get(String key, boolean checkMetadata)
	throws IOException {

	try {
	S3Object object = s3Service.getObject(bucket, key);
	if (checkMetadata) {
	checkMetadata(object);
	}
	return object.getDataInputStream();
	} catch (S3ServiceException e) {
	if ("NoSuchKey".equals(e.getS3ErrorCode())) {
	return null;
	}
	if (e.getCause() instanceof IOException) {
	throw (IOException) e.getCause();
	}
	throw new S3Exception(e);
	}
	}

	private InputStream get(String key, long byteRangeStart) throws IOException {
	try {
	S3Object object = s3Service.getObject(bucket, key, null, null, null,
	null, byteRangeStart, null);
	return object.getDataInputStream();
	} catch (S3ServiceException e) {
	if ("NoSuchKey".equals(e.getS3ErrorCode())) {
	return null;
	}
	if (e.getCause() instanceof IOException) {
	throw (IOException) e.getCause();
	}
	throw new S3Exception(e);
	}
	}

	private void checkMetadata(S3Object object) throws S3FileSystemException,
	S3ServiceException {

	String name = (String) object.getMetadata(FILE_SYSTEM_NAME);
	if (!FILE_SYSTEM_VALUE.equals(name)) {
	throw new S3FileSystemException("Not a Hadoop S3 file.");
	}
	String type = (String) object.getMetadata(FILE_SYSTEM_TYPE_NAME);
	if (!FILE_SYSTEM_TYPE_VALUE.equals(type)) {
	throw new S3FileSystemException("Not a block file.");
	}
	String dataVersion = (String) object.getMetadata(FILE_SYSTEM_VERSION_NAME);
	if (!FILE_SYSTEM_VERSION_VALUE.equals(dataVersion)) {
	throw new VersionMismatchException(FILE_SYSTEM_VERSION_VALUE,
	dataVersion);
	}
	}

	@Override
	public INode retrieveINode(Path path) throws IOException {
	return INode.deserialize(get(pathToKey(path), true));
	}

	@Override
	public File retrieveBlock(Block block, long byteRangeStart)
	throws IOException {
	File fileBlock = null;
	InputStream in = null;
	OutputStream out = null;
	try {
	fileBlock = newBackupFile();
	in = get(blockToKey(block), byteRangeStart);
	out = new BufferedOutputStream(new FileOutputStream(fileBlock));
	byte[] buf = new byte[bufferSize];
	int numRead;
	while ((numRead = in.read(buf)) >= 0) {
	out.write(buf, 0, numRead);
	}
	return fileBlock;
	} catch (IOException e) {
	// close output stream to file then delete file
	closeQuietly(out);
	out = null; // to prevent a second close
	if (fileBlock != null) {
	boolean b = fileBlock.delete();
	if (!b) {
	LOG.warn("Ignoring failed delete");
	}
	}
	throw e;
	} finally {
	closeQuietly(out);
	closeQuietly(in);
	}
	}

	private File newBackupFile() throws IOException {
	File dir = new File(conf.get("fs.s3.buffer.dir"));
	if (!dir.exists() && !dir.mkdirs()) {
	throw new IOException("Cannot create S3 buffer directory: " + dir);
	}
	File result = File.createTempFile("input-", ".tmp", dir);
	result.deleteOnExit();
	return result;
	}

	@Override
	public Set<Path> listSubPaths(Path path) throws IOException {
	try {
	String prefix = pathToKey(path);
	if (!prefix.endsWith(PATH_DELIMITER)) {
	prefix += PATH_DELIMITER;
	}
	S3Object[] objects = s3Service.listObjects(bucket, prefix, PATH_DELIMITER);
	Set<Path> prefixes = new TreeSet<Path>();
	for (int i = 0; i < objects.length; i++) {
	prefixes.add(keyToPath(objects[i].getKey()));
	}
	prefixes.remove(path);
	return prefixes;
	} catch (S3ServiceException e) {
	if (e.getCause() instanceof IOException) {
	throw (IOException) e.getCause();
	}
	throw new S3Exception(e);
	}
	}

	@Override
	public Set<Path> listDeepSubPaths(Path path) throws IOException {
	try {
	String prefix = pathToKey(path);
	if (!prefix.endsWith(PATH_DELIMITER)) {
	prefix += PATH_DELIMITER;
	}
	S3Object[] objects = s3Service.listObjects(bucket, prefix, null);
	Set<Path> prefixes = new TreeSet<Path>();
	for (int i = 0; i < objects.length; i++) {
	prefixes.add(keyToPath(objects[i].getKey()));
	}
	prefixes.remove(path);
	return prefixes;
	} catch (S3ServiceException e) {
	if (e.getCause() instanceof IOException) {
	throw (IOException) e.getCause();
	}
	throw new S3Exception(e);
	}
	}

	private void put(String key, InputStream in, long length, boolean storeMetadata)
	throws IOException {

	try {
	S3Object object = new S3Object(key);
	object.setDataInputStream(in);
	object.setContentType("binary/octet-stream");
	object.setContentLength(length);
	if (storeMetadata) {
	object.addAllMetadata(METADATA);
	}
	s3Service.putObject(bucket, object);
	} catch (S3ServiceException e) {
	if (e.getCause() instanceof IOException) {
	throw (IOException) e.getCause();
	}
	throw new S3Exception(e);
	}
	}

	@Override
	public void storeINode(Path path, INode inode) throws IOException {
	put(pathToKey(path), inode.serialize(), inode.getSerializedLength(), true);
	}

	@Override
	public void storeBlock(Block block, File file) throws IOException {
	BufferedInputStream in = null;
	try {
	in = new BufferedInputStream(new FileInputStream(file));
	put(blockToKey(block), in, block.getLength(), false);
	} finally {
	closeQuietly(in);
	}
	}

	private void closeQuietly(Closeable closeable) {
	if (closeable != null) {
	try {
	closeable.close();
	} catch (IOException e) {
	// ignore
	}
	}
	}

	private String pathToKey(Path path) {
	if (!path.isAbsolute()) {
	throw new IllegalArgumentException("Path must be absolute: " + path);
	}
	return path.toUri().getPath();
	}

	private Path keyToPath(String key) {
	return new Path(key);
	}

	private String blockToKey(long blockId) {
	return BLOCK_PREFIX + blockId;
	}

	private String blockToKey(Block block) {
	return blockToKey(block.getId());
	}

	@Override
	public void purge() throws IOException {
	try {
	S3Object[] objects = s3Service.listObjects(bucket);
	for (int i = 0; i < objects.length; i++) {
	s3Service.deleteObject(bucket, objects[i].getKey());
	}
	} catch (S3ServiceException e) {
	if (e.getCause() instanceof IOException) {
	throw (IOException) e.getCause();
	}
	throw new S3Exception(e);
	}
	}

	@Override
	public void dump() throws IOException {
	StringBuilder sb = new StringBuilder("S3 Filesystem, ");
	sb.append(bucket.getName()).append("\n");
	try {
	S3Object[] objects = s3Service.listObjects(bucket, PATH_DELIMITER, null);
	for (int i = 0; i < objects.length; i++) {
	Path path = keyToPath(objects[i].getKey());
	sb.append(path).append("\n");
	INode m = retrieveINode(path);
	sb.append("\t").append(m.getFileType()).append("\n");
	if (m.getFileType() == FileType.DIRECTORY) {
	continue;
	}
	for (int j = 0; j < m.getBlocks().length; j++) {
	sb.append("\t").append(m.getBlocks()[j]).append("\n");
	}
	}
	} catch (S3ServiceException e) {
	if (e.getCause() instanceof IOException) {
	throw (IOException) e.getCause();
	}
	throw new S3Exception(e);
	}
	System.out.println(sb);
	}

	}