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HDFS-12572. Ozone: OzoneFileSystem: delete/list status/rename/mkdir APIs. Contributed by Mukul Kumar Singh.

This commit is contained in:
Xiaoyu Yao 2017-10-10 15:06:05 -07:00 committed by Owen O'Malley
parent ae2b77a0e5
commit 9445a9267f
13 changed files with 531 additions and 76 deletions
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4
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/ozone/ksm/KSMMetadataManagerImpl.java
View File

@ -306,8 +306,10 @@ public class KSMMetadataManagerImpl implements KSMMetadataManager {
rangeResult = store.getSequentialRangeKVs(
getBucketKey(volumeName, startBucket),
maxNumOfBuckets + 1, filter);
if (!rangeResult.isEmpty()) {
//Remove start key from result.
rangeResult.remove(0);
}
} else {
rangeResult = store.getSequentialRangeKVs(null, maxNumOfBuckets, filter);
}
@ -350,8 +352,10 @@ public class KSMMetadataManagerImpl implements KSMMetadataManager {
rangeResult = store.getSequentialRangeKVs(
getDBKeyBytes(volumeName, bucketName, startKey),
maxKeys + 1, filter);
if (!rangeResult.isEmpty()) {
//Remove start key from result.
rangeResult.remove(0);
}
} else {
rangeResult = store.getSequentialRangeKVs(null, maxKeys, filter);
}

31
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/ozone/web/client/OzoneBucket.java
View File

@ -39,6 +39,7 @@ import org.apache.http.entity.ContentType;
import org.apache.http.entity.FileEntity;
import org.apache.http.entity.InputStreamEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@ -53,6 +54,7 @@ import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.file.Path;
import java.util.LinkedList;
@ -506,6 +508,35 @@ public class OzoneBucket {
}
}
/**
* List keys in a bucket with the provided prefix, with paging results.
*
* @param prefix The prefix of the object keys
* @param maxResult max size per response
* @param prevKey the previous key for paging
*/
public List<OzoneKey> listKeys(String prefix, int maxResult, String prevKey)
throws OzoneException {
HttpGet getRequest = null;
try {
final URI uri = new URIBuilder(volume.getClient().getEndPointURI())
.setPath(OzoneConsts.KSM_KEY_PREFIX + getVolume().getVolumeName() +
OzoneConsts.KSM_KEY_PREFIX + getBucketName())
.setParameter(Header.OZONE_LIST_QUERY_PREFIX, prefix)
.setParameter(Header.OZONE_LIST_QUERY_MAXKEYS,
String.valueOf(maxResult))
.setParameter(Header.OZONE_LIST_QUERY_PREVKEY, prevKey)
.build();
final OzoneRestClient client = getVolume().getClient();
getRequest = client.getHttpGet(uri.toString());
return executeListKeys(getRequest, HttpClientBuilder.create().build());
} catch (IOException | URISyntaxException e) {
throw new OzoneRestClientException(e.getMessage());
} finally {
OzoneClientUtils.releaseConnection(getRequest);
}
}
/**
* Execute list Key.
*

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/ozone/web/exceptions/OzoneExceptionMapper.java
View File

@ -36,7 +36,7 @@ public class OzoneExceptionMapper implements ExceptionMapper<OzoneException> {
@Override
public Response toResponse(OzoneException exception) {
LOG.info("Returning exception. ex: {}", exception.toJsonString());
LOG.debug("Returning exception. ex: {}", exception.toJsonString());
MDC.clear();
return Response.status((int)exception.getHttpCode())
.entity(exception.toJsonString()).build();

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/ozone/web/handlers/BucketProcessTemplate.java
View File

@ -94,7 +94,7 @@ public abstract class BucketProcessTemplate {
BucketArgs args = new BucketArgs(volume, bucket, userArgs);
MDC.put(OZONE_RESOURCE, args.getResourceName());
Response response = doProcess(args);
LOG.info("Success");
LOG.debug("Success");
MDC.clear();
return response;

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/ozone/web/handlers/KeyProcessTemplate.java
View File

@ -89,7 +89,7 @@ public abstract class KeyProcessTemplate {
KeyArgs args = new KeyArgs(volume, bucket, key, userArgs);
MDC.put(OZONE_RESOURCE, args.getResourceName());
Response response = doProcess(args, is, request, headers, info);
LOG.info("Success");
LOG.debug("Success");
MDC.clear();
return response;

8
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/utils/LevelDBStore.java
View File

@ -298,8 +298,9 @@ public class LevelDBStore implements MetadataStore {
* @param startKey a start key.
* @param count max number of entries to return.
* @param filters customized one or more {@link MetadataKeyFilter}.
* @return a list of entries found in the database.
* @throws IOException if an invalid startKey is given or other I/O errors.
* @return a list of entries found in the database or an empty list if the
* startKey is invalid.
* @throws IOException if there are I/O errors.
* @throws IllegalArgumentException if count is less than 0.
*/
private List<Entry<byte[], byte[]>> getRangeKVs(byte[] startKey,
@ -321,7 +322,8 @@ public class LevelDBStore implements MetadataStore {
dbIter.seekToFirst();
} else {
if (db.get(startKey) == null) {
throw new IOException("Invalid start key, not found in current db.");
// Key not found, return empty list
return result;
}
dbIter.seek(startKey);
}

5
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/utils/MetadataStore.java
View File

@ -90,8 +90,9 @@ public interface MetadataStore extends Closeable{
* @param startKey a start key.
* @param count max number of entries to return.
* @param filters customized one or more {@link MetadataKeyFilter}.
* @return a list of entries found in the database.
* @throws IOException if an invalid startKey is given or other I/O errors.
* @return a list of entries found in the database or an empty list if the
* startKey is invalid.
* @throws IOException if there are I/O errors.
* @throws IllegalArgumentException if count is less than 0.
*/
List<Map.Entry<byte[], byte[]>> getRangeKVs(byte[] startKey,

3
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/utils/RocksDBStore.java
View File

@ -160,7 +160,8 @@ public class RocksDBStore implements MetadataStore {
it.seekToFirst();
} else {
if(get(startKey) == null) {
throw new IOException("Invalid start key, not found in current db");
// Key not found, return empty list
return result;
}
it.seek(startKey);
}

6
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/ozone/TestMetadataStore.java
View File

@ -334,10 +334,10 @@ public class TestMetadataStore {
@Test
public void testInvalidStartKey() throws IOException {
// If startKey is invalid, throws an invalid key exception.
expectedException.expect(IOException.class);
expectedException.expectMessage("Invalid start key");
// If startKey is invalid, the returned list should be empty.
List<Map.Entry<byte[], byte[]>> kvs =
store.getRangeKVs(getBytes("unknownKey"), MAX_GETRANGE_LENGTH);
Assert.assertEquals(kvs.size(), 0);
}
@Test

19
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/ozone/ksm/TestKeySpaceManager.java
View File

@ -699,13 +699,8 @@ public class TestKeySpaceManager {
// Provide an invalid bucket name as start key.
listBucketArgs = new ListArgs(volArgs, null, 100, "unknown_bucket_name");
try {
storageHandler.listBuckets(listBucketArgs);
Assert.fail("Expecting an error when the given bucket name is invalid.");
} catch (Exception e) {
Assert.assertTrue(e instanceof IOException);
Assert.assertTrue(e.getMessage().contains(Status.INTERNAL_ERROR.name()));
}
ListBuckets buckets = storageHandler.listBuckets(listBucketArgs);
Assert.assertEquals(buckets.getBuckets().size(), 0);
// Use all arguments.
listBucketArgs = new ListArgs(volArgs, "b", 5, "bBucket_7");
@ -824,14 +819,8 @@ public class TestKeySpaceManager {
// Provide an invalid key name as start key.
listKeyArgs = new ListArgs(bucketArgs, null, 100, "invalid_start_key");
try {
storageHandler.listKeys(listKeyArgs);
Assert.fail("Expecting an error when the given start"
+ " key name is invalid.");
} catch (IOException e) {
GenericTestUtils.assertExceptionContains(
Status.INTERNAL_ERROR.name(), e);
}
ListKeys keys = storageHandler.listKeys(listKeyArgs);
Assert.assertEquals(keys.getKeyList().size(), 0);
// Provide an invalid maxKeys argument.
try {

5
hadoop-tools/hadoop-ozone/src/main/java/org/apache/hadoop/fs/ozone/Constants.java
View File

@ -23,7 +23,7 @@ package org.apache.hadoop.fs.ozone;
*/
public class Constants {
public static final String OZONE_URI_SCHEME = "ozfs";
public static final String OZONE_URI_SCHEME = "o3";
public static final String OZONE_DEFAULT_USER = "hdfs";
@ -39,6 +39,9 @@ public class Constants {
public static final String OZONE_URI_DELIMITER = "/";
/** Page size for Ozone listing operation. */
public static final int LISTING_PAGE_SIZE = 1024;
private Constants() {
}

485
hadoop-tools/hadoop-ozone/src/main/java/org/apache/hadoop/fs/ozone/OzoneFileSystem.java
View File

@ -18,14 +18,26 @@
package org.apache.hadoop.fs.ozone;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.List;
import java.util.Objects;
import org.apache.hadoop.fs.CreateFlag;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileAlreadyExistsException;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.LocalDirAllocator;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathIsNotEmptyDirectoryException;
import org.apache.hadoop.ozone.web.client.OzoneKey;
import org.apache.hadoop.ozone.web.client.OzoneRestClient;
import org.apache.hadoop.ozone.web.utils.OzoneUtils;
@ -33,16 +45,10 @@ import org.apache.http.client.utils.URIBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.commons.lang.StringUtils;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.CreateFlag;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.FileAlreadyExistsException;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.ozone.web.client.OzoneBucket;
import org.apache.hadoop.ozone.web.client.OzoneVolume;
@ -55,6 +61,8 @@ import static org.apache.hadoop.fs.ozone.Constants.OZONE_URI_SCHEME;
import static org.apache.hadoop.fs.ozone.Constants.OZONE_USER_DIR;
import static org.apache.hadoop.fs.ozone.Constants.OZONE_HTTP_SCHEME;
import static org.apache.hadoop.fs.ozone.Constants.OZONE_URI_DELIMITER;
import static org.apache.hadoop.fs.ozone.Constants.LISTING_PAGE_SIZE;
import static org.apache.hadoop.fs.ozone.Constants.BUFFER_DIR_KEY;
/**
* The Ozone Filesystem implementation.
@ -181,10 +189,19 @@ public class OzoneFileSystem extends FileSystem {
// path references a file and overwrite is disabled
throw new FileAlreadyExistsException(f + " already exists");
}
LOG.debug("Overwriting file {}", f);
//TODO: Delete the existing file here
LOG.trace("Overwriting file {}", f);
deleteObject(key);
}
} catch (FileNotFoundException ignored) {
// check if the parent directory needs to be created
Path parent = f.getParent();
try {
// create all the directories for the parent
FileStatus parentStatus = getFileStatus(parent);
LOG.trace("parent key:{} status:{}", key, parentStatus);
} catch (FileNotFoundException e) {
mkdirs(parent);
}
// This exception needs to ignored as this means that the file currently
// does not exists and a new file can thus be created.
}
@ -222,19 +239,221 @@ public class OzoneFileSystem extends FileSystem {
+ getClass().getSimpleName() + " FileSystem implementation");
}
private class RenameIterator extends OzoneListingIterator {
private final String srcKey;
private final String dstKey;
RenameIterator(Path srcPath, Path dstPath)
throws IOException {
super(srcPath, true);
srcKey = pathToKey(srcPath);
dstKey = pathToKey(dstPath);
LOG.trace("rename from:{} to:{}", srcKey, dstKey);
}
boolean processKey(String key) throws IOException {
String newKeyName = dstKey.concat(key.substring(srcKey.length()));
return rename(key, newKeyName);
}
// TODO: currently rename work by copying the file, with changes in KSM,
// this operation can be made improved by renaming the keys in KSM directly.
private boolean rename(String src, String dst) throws IOException {
final LocalDirAllocator dirAlloc = new LocalDirAllocator(BUFFER_DIR_KEY);
final File tmpFile = dirAlloc.createTmpFileForWrite("output-",
LocalDirAllocator.SIZE_UNKNOWN, getConf());
try {
LOG.trace("rename by copying file from:{} to:{}", src, dst);
bucket.getKey(src, tmpFile.toPath());
bucket.putKey(dst, tmpFile);
return true;
} catch (OzoneException oe) {
String msg = String.format("Error when renaming key from:%s to:%s",
src, dst);
LOG.error(msg, oe);
throw new IOException(msg, oe);
} finally {
if (!tmpFile.delete()) {
LOG.warn("Can not delete tmpFile: " + tmpFile);
}
}
}
}
/**
* Check whether the source and destination path are valid and then perform
* rename by copying the data from source path to destination path.
*
* The rename operation is performed by copying data from source key
* to destination key. This is done by reading the source key data into a
* temporary file and then writing this temporary file to destination key.
* The temporary file is deleted after the rename operation.
* TODO: Optimize the operation by renaming keys in KSM.
*
* @param src source path for rename
* @param dst destination path for rename
* @return true if rename operation succeeded or
* if the src and dst have the same path and are of the same type
* @throws IOException on I/O errors or if the src/dst paths are invalid.
*/
@Override
public boolean rename(Path src, Path dst) throws IOException {
LOG.trace("rename() from:{} to:{}", src, dst);
if (src.isRoot()) {
// Cannot rename root of file system
LOG.trace("Cannot rename the root of a filesystem");
return false;
}
// Cannot rename a directory to its own subdirectory
Path parent = dst.getParent();
while (parent != null && !src.equals(parent)) {
parent = parent.getParent();
}
if (parent != null) {
return false;
}
// Check if the source exists
FileStatus srcStatus;
try {
srcStatus = getFileStatus(src);
} catch (FileNotFoundException fnfe) {
// source doesn't exist, return
return false;
}
// Check if the destination exists
FileStatus dstStatus;
try {
dstStatus = getFileStatus(dst);
} catch (FileNotFoundException fnde) {
dstStatus = null;
}
if (dstStatus == null) {
// If dst doesn't exist, check whether dst parent dir exists or not
// if the parent exists, the source can still be renamed to dst path
dstStatus = getFileStatus(dst.getParent());
if (!dstStatus.isDirectory()) {
throw new IOException(String.format(
"Failed to rename %s to %s, %s is a file", src, dst,
dst.getParent()));
}
} else {
// if dst exists and source and destination are same,
// check both the src and dst are of same type
if (srcStatus.getPath().equals(dstStatus.getPath())) {
return !srcStatus.isDirectory();
} else if (dstStatus.isDirectory()) {
// If dst is a directory, rename source as subpath of it.
// for example rename /source to /dst will lead to /dst/source
dst = new Path(dst, src.getName());
FileStatus[] statuses;
try {
statuses = listStatus(dst);
} catch (FileNotFoundException fnde) {
statuses = null;
}
if (statuses != null && statuses.length > 0) {
// If dst exists and not a directory not empty
throw new FileAlreadyExistsException(String.format(
"Failed to rename %s to %s, file already exists or not empty!",
src, dst));
}
} else {
// If dst is not a directory
throw new FileAlreadyExistsException(String.format(
"Failed to rename %s to %s, file already exists!", src, dst));
}
}
if (srcStatus.isDirectory()) {
if (dst.toString().startsWith(src.toString())) {
LOG.trace("Cannot rename a directory to a subdirectory of self");
return false;
}
}
RenameIterator iterator = new RenameIterator(src, dst);
iterator.iterate();
return src.equals(dst) || delete(src, true);
}
private class DeleteIterator extends OzoneListingIterator {
private boolean recursive;
DeleteIterator(Path f, boolean recursive)
throws IOException {
super(f, recursive);
this.recursive = recursive;
}
boolean processKey(String key) throws IOException {
if (key.equals("")) {
LOG.trace("Skipping deleting root directory");
return true;
} else {
LOG.trace("deleting key:" + key);
boolean succeed = deleteObject(key);
// if recursive delete is requested ignore the return value of
// deleteObject and issue deletes for other keys.
return recursive || succeed;
}
}
}
@Override
public boolean delete(Path f, boolean recursive) throws IOException {
LOG.trace("delete() path:{} recursive:{}", f, recursive);
try {
DeleteIterator iterator = new DeleteIterator(f, recursive);
return iterator.iterate();
} catch (FileNotFoundException e) {
LOG.error("Couldn't delete {} - does not exist", f);
return false;
}
}
private class ListStatusIterator extends OzoneListingIterator {
private List<FileStatus> statuses = new ArrayList<>(LISTING_PAGE_SIZE);
private Path f;
ListStatusIterator(Path f) throws IOException {
super(f, true);
this.f = f;
}
boolean processKey(String key) throws IOException {
Path keyPath = new Path(OZONE_URI_DELIMITER + key);
if (key.equals(getPathKey())) {
if (pathIsDirectory()) {
return true;
} else {
statuses.add(getFileStatus(keyPath));
return true;
}
}
// left with only subkeys now
if (keyPath.getParent().getName().equals(f.getName())) {
// skip keys which are for subdirectories of the directory
statuses.add(getFileStatus(keyPath));
}
return true;
}
FileStatus[] getStatuses() {
return statuses.toArray(new FileStatus[statuses.size()]);
}
}
@Override
public FileStatus[] listStatus(Path f) throws IOException {
return null;
LOG.trace("listStatus() path:{}", f);
ListStatusIterator iterator = new ListStatusIterator(f);
iterator.iterate();
return iterator.getStatuses();
}
@Override
@ -247,38 +466,67 @@ public class OzoneFileSystem extends FileSystem {
return workingDir;
}
@Override
public boolean mkdirs(Path f, FsPermission permission) throws IOException {
/**
* Check whether the path is valid and then create directories.
* Directory is represented using a key with no value.
* All the non-existent parent directories are also created.
*
* @param path directory path to be created
* @return true if directory exists or created successfully.
* @throws IOException
*/
private boolean mkdir(Path path) throws IOException {
Path fPart = path;
Path prevfPart = null;
do {
LOG.trace("validating path:{}", fPart);
try {
FileStatus fileStatus = getFileStatus(fPart);
if (fileStatus.isDirectory()) {
// If path exists and a directory, exit
break;
} else {
// Found a file here, rollback and delete newly created directories
LOG.trace("Found a file with same name as directory, path:{}", fPart);
if (prevfPart != null) {
delete(prevfPart, true);
}
throw new FileAlreadyExistsException(String.format(
"Can't make directory for path '%s', it is a file.", fPart));
}
} catch (FileNotFoundException fnfe) {
LOG.trace("creating directory for fpart:{}", fPart);
String key = pathToKey(fPart);
String dirKey = addTrailingSlashIfNeeded(key);
if (!createDirectory(dirKey)) {
// Directory creation failed here,
// rollback and delete newly created directories
LOG.trace("Directory creation failed, path:{}", fPart);
if (prevfPart != null) {
delete(prevfPart, true);
}
return false;
}
private OzoneKey getKeyStatus(String keyName) {
try {
return bucket.getKeyInfo(keyName);
} catch (OzoneException e) {
LOG.trace("Key:{} does not exists", keyName);
return null;
}
prevfPart = fPart;
fPart = fPart.getParent();
} while (fPart != null);
return true;
}
private long getModifiedTime(String modifiedTime, String key) {
try {
return OzoneUtils.formatDate(modifiedTime);
} catch (ParseException pe) {
LOG.error("Invalid time:{} for key:{}", modifiedTime, key, pe);
return 0;
@Override
public boolean mkdirs(Path f, FsPermission permission) throws IOException {
LOG.trace("mkdir() path:{} ", f);
String key = pathToKey(f);
if (StringUtils.isEmpty(key)) {
return false;
}
}
private boolean isDirectory(OzoneKey key) {
LOG.trace("key name:{} size:{}", key.getObjectInfo().getKeyName(),
key.getObjectInfo().getSize());
return key.getObjectInfo().getKeyName().endsWith(OZONE_URI_DELIMITER)
&& (key.getObjectInfo().getSize() == 0);
return mkdir(f);
}
@Override
public FileStatus getFileStatus(Path f) throws IOException {
LOG.trace("getFileStatus() path:{}", f);
Path qualifiedPath = f.makeQualified(uri, workingDir);
String key = pathToKey(qualifiedPath);
@ -289,11 +537,10 @@ public class OzoneFileSystem extends FileSystem {
}
// consider this a file and get key status
OzoneKey meta = getKeyStatus(key);
if (meta == null && !key.endsWith(OZONE_URI_DELIMITER)) {
// if that fails consider this a directory
key += OZONE_URI_DELIMITER;
meta = getKeyStatus(key);
OzoneKey meta = getKeyInfo(key);
if (meta == null) {
key = addTrailingSlashIfNeeded(key);
meta = getKeyInfo(key);
}
if (meta == null) {
@ -304,6 +551,7 @@ public class OzoneFileSystem extends FileSystem {
getModifiedTime(meta.getObjectInfo().getModifiedOn(), key),
qualifiedPath);
} else {
//TODO: Fetch replication count from ratis config
return new FileStatus(meta.getObjectInfo().getSize(), false, 1,
getDefaultBlockSize(f),
getModifiedTime(meta.getObjectInfo().getModifiedOn(), key),
@ -311,13 +559,102 @@ public class OzoneFileSystem extends FileSystem {
}
}
/**
* Helper method to fetch the key metadata info.
* @param key key whose metadata information needs to be fetched
* @return metadata info of the key
*/
private OzoneKey getKeyInfo(String key) {
try {
return bucket.getKeyInfo(key);
} catch (OzoneException e) {
LOG.trace("Key:{} does not exists", key);
return null;
}
}
/**
* Helper method to get the modified time of the key.
* @param key key to fetch the modified time
* @return last modified time of the key
*/
private long getModifiedTime(String modifiedTime, String key) {
try {
return OzoneUtils.formatDate(modifiedTime);
} catch (ParseException pe) {
LOG.error("Invalid time:{} for key:{}", modifiedTime, key, pe);
return 0;
}
}
/**
* Helper method to check if an Ozone key is representing a directory.
* @param key key to be checked as a directory
* @return true if key is a directory, false otherwise
*/
private boolean isDirectory(OzoneKey key) {
LOG.trace("key name:{} size:{}", key.getObjectInfo().getKeyName(),
key.getObjectInfo().getSize());
return key.getObjectInfo().getKeyName().endsWith(OZONE_URI_DELIMITER)
&& (key.getObjectInfo().getSize() == 0);
}
/**
* Helper method to list entries matching the key name in bucket.
* @param dirKey key prefix for listing the keys
* @param lastKey last iterated key
* @return List of Keys
*/
List<OzoneKey> listKeys(String dirKey, String lastKey)
throws IOException {
LOG.trace("list keys dirKey:{} lastKey:{}", dirKey, lastKey);
try {
return bucket.listKeys(dirKey, LISTING_PAGE_SIZE, lastKey);
} catch (OzoneException oe) {
LOG.error("list keys failed dirKey:{} lastKey:{}", dirKey, lastKey, oe);
throw new IOException("List keys failed " + oe.getMessage());
}
}
/**
* Helper method to create an directory specified by key name in bucket.
* @param keyName key name to be created as directory
* @return true if the key is created, false otherwise
*/
private boolean createDirectory(String keyName) {
try {
LOG.trace("creating dir for key:{}", keyName);
bucket.putKey(keyName, "");
return true;
} catch (OzoneException oe) {
LOG.error("create key failed for key:{}", keyName, oe);
return false;
}
}
/**
* Helper method to delete an object specified by key name in bucket.
* @param keyName key name to be deleted
* @return true if the key is deleted, false otherwise
*/
private boolean deleteObject(String keyName) {
LOG.trace("issuing delete for key" + keyName);
try {
bucket.deleteKey(keyName);
return true;
} catch (OzoneException oe) {
LOG.error("delete key failed " + oe.getMessage());
return false;
}
}
/**
* Turn a path (relative or otherwise) into an Ozone key.
*
* @param path the path of the file.
* @return the key of the object that represents the file.
*/
private String pathToKey(Path path) {
public String pathToKey(Path path) {
Objects.requireNonNull(path, "Path can not be null!");
if (!path.isAbsolute()) {
path = new Path(workingDir, path);
@ -328,6 +665,20 @@ public class OzoneFileSystem extends FileSystem {
return key;
}
/**
* Add trailing delimiter to path if it is already not present.
*
* @param key the ozone Key which needs to be appended
* @return delimiter appended key
*/
String addTrailingSlashIfNeeded(String key) {
if (StringUtils.isNotEmpty(key) && !key.endsWith(OZONE_URI_DELIMITER)) {
return key + OZONE_URI_DELIMITER;
} else {
return key;
}
}
@Override
public String toString() {
return "OzoneFileSystem{URI=" + uri + ", "
@ -336,4 +687,62 @@ public class OzoneFileSystem extends FileSystem {
+ "statistics=" + statistics
+ "}";
}
private abstract class OzoneListingIterator {
private final Path path;
private final boolean recursive;
private final FileStatus status;
private String pathKey;
OzoneListingIterator(Path path, boolean recursive)
throws IOException {
this.path = path;
this.recursive = recursive;
this.status = getFileStatus(path);
this.pathKey = pathToKey(path);
if (status.isDirectory()) {
this.pathKey = addTrailingSlashIfNeeded(pathKey);
}
}
abstract boolean processKey(String key) throws IOException;
// iterates all the keys in the particular path
boolean iterate() throws IOException {
LOG.trace("Iterating path {} - recursive {}", path, recursive);
if (status.isDirectory()) {
LOG.trace("Iterating directory:{}", pathKey);
String lastKey = pathKey;
while (true) {
List<OzoneKey> ozoneKeys = listKeys(pathKey, lastKey);
LOG.trace("number of sub keys:{}", ozoneKeys.size());
if (ozoneKeys.size() == 0) {
return processKey(pathKey);
} else {
if (!recursive) {
throw new PathIsNotEmptyDirectoryException(path.toString());
} else {
for (OzoneKey ozoneKey : ozoneKeys) {
lastKey = ozoneKey.getObjectInfo().getKeyName();
if (!processKey(lastKey)) {
return false;
}
}
}
}
}
} else {
LOG.trace("iterating file:{}", path);
return processKey(pathKey);
}
}
String getPathKey() {
return pathKey;
}
boolean pathIsDirectory() {
return status.isDirectory();
}
}
}

15
hadoop-tools/hadoop-ozone/src/test/java/org/apache/hadoop/fs/ozone/TestOzoneFileInterfaces.java
View File

@ -123,4 +123,19 @@ public class TestOzoneFileInterfaces {
Assert.assertEquals(out, data);
}
}
@Test
public void testDirectory() throws IOException {
String dirPath = RandomStringUtils.randomAlphanumeric(5);
Path path = new Path("/" + dirPath);
Assert.assertTrue(fs.mkdirs(path));
FileStatus status = fs.getFileStatus(path);
Assert.assertTrue(status.isDirectory());
Assert.assertEquals(status.getLen(), 0);
FileStatus[] statusList = fs.listStatus(new Path("/"));
Assert.assertEquals(statusList.length, 1);
Assert.assertEquals(statusList[0], status);
}
}