hadoop OBSPosixBucketUtils 源码
haddop OBSPosixBucketUtils 代码
文件路径：/hadoop-cloud-storage-project/hadoop-huaweicloud/src/main/java/org/apache/hadoop/fs/obs/OBSPosixBucketUtils.java
/*
* 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.obs;
import com.obs.services.exception.ObsException;
import com.obs.services.model.KeyAndVersion;
import com.obs.services.model.ListObjectsRequest;
import com.obs.services.model.ObjectListing;
import com.obs.services.model.ObsObject;
import com.obs.services.model.fs.GetAttributeRequest;
import com.obs.services.model.fs.NewFolderRequest;
import com.obs.services.model.fs.ObsFSAttribute;
import com.obs.services.model.fs.RenameRequest;
import org.apache.hadoop.fs.ContentSummary;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.ParentNotDirectoryException;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathIsNotEmptyDirectoryException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
/**
* Posix bucket specific utils for {@link OBSFileSystem}.
*/
final class OBSPosixBucketUtils {
/**
* Class logger.
*/
private static final Logger LOG = LoggerFactory.getLogger(
OBSPosixBucketUtils.class);
private OBSPosixBucketUtils() {
}
/**
* Get the depth of an absolute path, that is the number of '/' in the path.
*
* @param key object key
* @return depth
*/
static int fsGetObjectKeyDepth(final String key) {
int depth = 0;
for (int idx = key.indexOf('/');
idx >= 0; idx = key.indexOf('/', idx + 1)) {
depth++;
}
return key.endsWith("/") ? depth - 1 : depth;
}
/**
* Used to judge that an object is a file or folder.
*
* @param attr posix object attribute
* @return is posix folder
*/
static boolean fsIsFolder(final ObsFSAttribute attr) {
final int ifDir = 0x004000;
int mode = attr.getMode();
// object mode is -1 when the object is migrated from
// object bucket to posix bucket.
// -1 is a file, not folder.
if (mode < 0) {
return false;
}
return (mode & ifDir) != 0;
}
/**
* The inner rename operation based on Posix bucket.
*
* @param owner OBS File System instance
* @param src source path to be renamed from
* @param dst destination path to be renamed to
* @return boolean
* @throws RenameFailedException if some criteria for a state changing rename
* was not met. This means work didn't happen;
* it's not something which is reported upstream
* to the FileSystem APIs, for which the
* semantics of "false" are pretty vague.
* @throws IOException on IO failure.
*/
static boolean renameBasedOnPosix(final OBSFileSystem owner, final Path src,
final Path dst) throws IOException {
Path dstPath = dst;
String srcKey = OBSCommonUtils.pathToKey(owner, src);
String dstKey = OBSCommonUtils.pathToKey(owner, dstPath);
if (srcKey.isEmpty()) {
LOG.error("rename: src [{}] is root directory", src);
return false;
}
try {
FileStatus dstStatus = owner.getFileStatus(dstPath);
if (dstStatus.isDirectory()) {
String newDstString = OBSCommonUtils.maybeAddTrailingSlash(
dstPath.toString());
String filename = srcKey.substring(
OBSCommonUtils.pathToKey(owner, src.getParent())
.length() + 1);
dstPath = new Path(newDstString + filename);
dstKey = OBSCommonUtils.pathToKey(owner, dstPath);
LOG.debug(
"rename: dest is an existing directory and will be "
+ "changed to [{}]", dstPath);
if (owner.exists(dstPath)) {
LOG.error("rename: failed to rename " + src + " to "
+ dstPath
+ " because destination exists");
return false;
}
} else {
if (srcKey.equals(dstKey)) {
LOG.warn(
"rename: src and dest refer to the same "
+ "file or directory: {}", dstPath);
return true;
} else {
LOG.error("rename: failed to rename " + src + " to "
+ dstPath
+ " because destination exists");
return false;
}
}
} catch (FileNotFoundException e) {
// if destination does not exist, do not change the
// destination key, and just do rename.
LOG.debug("rename: dest [{}] does not exist", dstPath);
} catch (FileConflictException e) {
Path parent = dstPath.getParent();
if (!OBSCommonUtils.pathToKey(owner, parent).isEmpty()) {
FileStatus dstParentStatus = owner.getFileStatus(parent);
if (!dstParentStatus.isDirectory()) {
throw new ParentNotDirectoryException(
parent + " is not a directory");
}
}
}
if (dstKey.startsWith(srcKey) && (dstKey.equals(srcKey)
|| dstKey.charAt(srcKey.length()) == Path.SEPARATOR_CHAR)) {
LOG.error("rename: dest [{}] cannot be a descendant of src [{}]",
dstPath, src);
return false;
}
return innerFsRenameWithRetry(owner, src, dstPath, srcKey, dstKey);
}
private static boolean innerFsRenameWithRetry(final OBSFileSystem owner,
final Path src,
final Path dst, final String srcKey, final String dstKey)
throws IOException {
boolean renameResult = true;
int retryTime = 1;
while (retryTime <= OBSCommonUtils.MAX_RETRY_TIME) {
try {
LOG.debug("rename: {}-st rename from [{}] to [{}] ...",
retryTime, srcKey, dstKey);
innerFsRenameFile(owner, srcKey, dstKey);
renameResult = true;
break;
} catch (FileNotFoundException e) {
if (owner.exists(dst)) {
LOG.warn(
"rename: successfully {}-st rename src [{}] "
+ "to dest [{}] with SDK retry",
retryTime, src, dst, e);
renameResult = true;
} else {
LOG.error(
"rename: failed {}-st rename src [{}] to dest [{}]",
retryTime, src, dst, e);
renameResult = false;
}
break;
} catch (IOException e) {
if (retryTime == OBSCommonUtils.MAX_RETRY_TIME) {
LOG.error(
"rename: failed {}-st rename src [{}] to dest [{}]",
retryTime, src, dst, e);
throw e;
} else {
LOG.warn(
"rename: failed {}-st rename src [{}] to dest [{}]",
retryTime, src, dst, e);
if (owner.exists(dst) && owner.exists(src)) {
LOG.warn(
"rename: failed {}-st rename src [{}] to "
+ "dest [{}] with SDK retry", retryTime, src,
dst, e);
renameResult = false;
break;
}
try {
Thread.sleep(OBSCommonUtils.DELAY_TIME);
} catch (InterruptedException ie) {
throw e;
}
}
}
retryTime++;
}
return renameResult;
}
/**
* Used to rename a source folder to a destination folder that is not existed
* before rename.
*
* @param owner OBS File System instance
* @param src source folder key
* @param dst destination folder key that not existed before rename
* @throws IOException any io exception
* @throws ObsException any obs operation exception
*/
static void fsRenameToNewFolder(final OBSFileSystem owner, final String src,
final String dst)
throws IOException, ObsException {
LOG.debug("RenameFolder path {} to {}", src, dst);
try {
RenameRequest renameObjectRequest = new RenameRequest();
renameObjectRequest.setBucketName(owner.getBucket());
renameObjectRequest.setObjectKey(src);
renameObjectRequest.setNewObjectKey(dst);
owner.getObsClient().renameFolder(renameObjectRequest);
owner.getSchemeStatistics().incrementWriteOps(1);
} catch (ObsException e) {
throw OBSCommonUtils.translateException(
"renameFile(" + src + ", " + dst + ")", src, e);
}
}
static void innerFsRenameFile(final OBSFileSystem owner,
final String srcKey,
final String dstKey) throws IOException {
LOG.debug("RenameFile path {} to {}", srcKey, dstKey);
try {
final RenameRequest renameObjectRequest = new RenameRequest();
renameObjectRequest.setBucketName(owner.getBucket());
renameObjectRequest.setObjectKey(srcKey);
renameObjectRequest.setNewObjectKey(dstKey);
owner.getObsClient().renameFile(renameObjectRequest);
owner.getSchemeStatistics().incrementWriteOps(1);
} catch (ObsException e) {
if (e.getResponseCode() == OBSCommonUtils.NOT_FOUND_CODE) {
throw new FileNotFoundException(
"No such file or directory: " + srcKey);
}
if (e.getResponseCode() == OBSCommonUtils.CONFLICT_CODE) {
throw new FileConflictException(
"File conflicts during rename, " + e.getResponseStatus());
}
throw OBSCommonUtils.translateException(
"renameFile(" + srcKey + ", " + dstKey + ")", srcKey, e);
}
}
/**
* Used to rename a source object to a destination object which is not existed
* before rename.
*
* @param owner OBS File System instance
* @param srcKey source object key
* @param dstKey destination object key
* @throws IOException io exception
*/
static void fsRenameToNewObject(final OBSFileSystem owner,
final String srcKey,
final String dstKey) throws IOException {
String newSrcKey = srcKey;
String newdstKey = dstKey;
newSrcKey = OBSCommonUtils.maybeDeleteBeginningSlash(newSrcKey);
newdstKey = OBSCommonUtils.maybeDeleteBeginningSlash(newdstKey);
if (newSrcKey.endsWith("/")) {
// Rename folder.
fsRenameToNewFolder(owner, newSrcKey, newdstKey);
} else {
// Rename file.
innerFsRenameFile(owner, newSrcKey, newdstKey);
}
}
// Delete a file.
private static int fsRemoveFile(final OBSFileSystem owner,
final String sonObjectKey,
final List<KeyAndVersion> files)
throws IOException {
files.add(new KeyAndVersion(sonObjectKey));
if (files.size() == owner.getMaxEntriesToDelete()) {
// batch delete files.
OBSCommonUtils.removeKeys(owner, files, true, false);
return owner.getMaxEntriesToDelete();
}
return 0;
}
// Recursively delete a folder that might be not empty.
static boolean fsDelete(final OBSFileSystem owner, final FileStatus status,
final boolean recursive)
throws IOException, ObsException {
long startTime = System.currentTimeMillis();
long threadId = Thread.currentThread().getId();
Path f = status.getPath();
String key = OBSCommonUtils.pathToKey(owner, f);
if (!status.isDirectory()) {
LOG.debug("delete: Path is a file");
trashObjectIfNeed(owner, key);
} else {
LOG.debug("delete: Path is a directory: {} - recursive {}", f,
recursive);
key = OBSCommonUtils.maybeAddTrailingSlash(key);
boolean isEmptyDir = OBSCommonUtils.isFolderEmpty(owner, key);
if (key.equals("")) {
return OBSCommonUtils.rejectRootDirectoryDelete(
owner.getBucket(), isEmptyDir, recursive);
}
if (!recursive && !isEmptyDir) {
LOG.warn("delete: Path is not empty: {} - recursive {}", f,
recursive);
throw new PathIsNotEmptyDirectoryException(f.toString());
}
if (isEmptyDir) {
LOG.debug(
"delete: Deleting fake empty directory {} - recursive {}",
f, recursive);
OBSCommonUtils.deleteObject(owner, key);
} else {
LOG.debug(
"delete: Deleting objects for directory prefix {} to "
+ "delete - recursive {}", f, recursive);
trashFolderIfNeed(owner, key, f);
}
}
long endTime = System.currentTimeMillis();
LOG.debug("delete Path:{} thread:{}, timeUsedInMilliSec:{}", f,
threadId, endTime - startTime);
return true;
}
private static void trashObjectIfNeed(final OBSFileSystem owner,
final String key)
throws ObsException, IOException {
if (needToTrash(owner, key)) {
mkTrash(owner, key);
StringBuilder sb = new StringBuilder(owner.getTrashDir());
sb.append(key);
if (owner.exists(new Path(sb.toString()))) {
SimpleDateFormat df = new SimpleDateFormat("-yyyyMMddHHmmss");
sb.append(df.format(new Date()));
}
fsRenameToNewObject(owner, key, sb.toString());
LOG.debug("Moved: '" + key + "' to trash at: " + sb.toString());
} else {
OBSCommonUtils.deleteObject(owner, key);
}
}
private static void trashFolderIfNeed(final OBSFileSystem owner,
final String key,
final Path f) throws ObsException, IOException {
if (needToTrash(owner, key)) {
mkTrash(owner, key);
StringBuilder sb = new StringBuilder(owner.getTrashDir());
String subKey = OBSCommonUtils.maybeAddTrailingSlash(key);
sb.append(subKey);
if (owner.exists(new Path(sb.toString()))) {
SimpleDateFormat df = new SimpleDateFormat("-yyyyMMddHHmmss");
sb.insert(sb.length() - 1, df.format(new Date()));
}
String srcKey = OBSCommonUtils.maybeDeleteBeginningSlash(key);
String dstKey = OBSCommonUtils.maybeDeleteBeginningSlash(
sb.toString());
fsRenameToNewFolder(owner, srcKey, dstKey);
LOG.debug("Moved: '" + key + "' to trash at: " + sb.toString());
} else {
if (owner.isEnableMultiObjectDeleteRecursion()) {
long delNum = fsRecursivelyDeleteDir(owner, key, true);
LOG.debug("Recursively delete {} files/dirs when deleting {}",
delNum, key);
} else {
fsNonRecursivelyDelete(owner, f);
}
}
}
static long fsRecursivelyDeleteDir(final OBSFileSystem owner,
final String parentKey,
final boolean deleteParent) throws IOException {
long delNum = 0;
List<KeyAndVersion> subdirList = new ArrayList<>(
owner.getMaxEntriesToDelete());
List<KeyAndVersion> fileList = new ArrayList<>(
owner.getMaxEntriesToDelete());
ListObjectsRequest request = OBSCommonUtils.createListObjectsRequest(
owner, parentKey, "/", owner.getMaxKeys());
ObjectListing objects = OBSCommonUtils.listObjects(owner, request);
while (true) {
for (String commonPrefix : objects.getCommonPrefixes()) {
if (commonPrefix.equals(parentKey)) {
// skip prefix itself
continue;
}
delNum += fsRemoveSubdir(owner, commonPrefix, subdirList);
}
for (ObsObject sonObject : objects.getObjects()) {
String sonObjectKey = sonObject.getObjectKey();
if (sonObjectKey.equals(parentKey)) {
// skip prefix itself
continue;
}
if (!sonObjectKey.endsWith("/")) {
delNum += fsRemoveFile(owner, sonObjectKey, fileList);
} else {
delNum += fsRemoveSubdir(owner, sonObjectKey, subdirList);
}
}
if (!objects.isTruncated()) {
break;
}
objects = OBSCommonUtils.continueListObjects(owner, objects);
}
delNum += fileList.size();
OBSCommonUtils.removeKeys(owner, fileList, true, false);
delNum += subdirList.size();
OBSCommonUtils.removeKeys(owner, subdirList, true, false);
if (deleteParent) {
OBSCommonUtils.deleteObject(owner, parentKey);
delNum++;
}
return delNum;
}
private static boolean needToTrash(final OBSFileSystem owner,
final String key) {
String newKey = key;
newKey = OBSCommonUtils.maybeDeleteBeginningSlash(newKey);
if (owner.isEnableTrash() && newKey.startsWith(owner.getTrashDir())) {
return false;
}
return owner.isEnableTrash();
}
// Delete a sub dir.
private static int fsRemoveSubdir(final OBSFileSystem owner,
final String subdirKey,
final List<KeyAndVersion> subdirList)
throws IOException {
fsRecursivelyDeleteDir(owner, subdirKey, false);
subdirList.add(new KeyAndVersion(subdirKey));
if (subdirList.size() == owner.getMaxEntriesToDelete()) {
// batch delete subdirs.
OBSCommonUtils.removeKeys(owner, subdirList, true, false);
return owner.getMaxEntriesToDelete();
}
return 0;
}
private static void mkTrash(final OBSFileSystem owner, final String key)
throws ObsException, IOException {
String newKey = key;
StringBuilder sb = new StringBuilder(owner.getTrashDir());
newKey = OBSCommonUtils.maybeAddTrailingSlash(newKey);
sb.append(newKey);
sb.deleteCharAt(sb.length() - 1);
sb.delete(sb.lastIndexOf("/"), sb.length());
Path fastDeleteRecycleDirPath = new Path(sb.toString());
// keep the parent directory of the target path exists
if (!owner.exists(fastDeleteRecycleDirPath)) {
owner.mkdirs(fastDeleteRecycleDirPath);
}
}
// List all sub objects at first, delete sub objects in batch secondly.
private static void fsNonRecursivelyDelete(final OBSFileSystem owner,
final Path parent)
throws IOException, ObsException {
// List sub objects sorted by path depth.
FileStatus[] arFileStatus = OBSCommonUtils.innerListStatus(owner,
parent, true);
// Remove sub objects one depth by one depth to avoid that parents and
// children in a same batch.
fsRemoveKeys(owner, arFileStatus);
// Delete parent folder that should has become empty.
OBSCommonUtils.deleteObject(owner,
OBSCommonUtils.pathToKey(owner, parent));
}
// Remove sub objects of each depth one by one to avoid that parents and
// children in a same batch.
private static void fsRemoveKeys(final OBSFileSystem owner,
final FileStatus[] arFileStatus)
throws ObsException, IOException {
if (arFileStatus.length <= 0) {
// exit fast if there are no keys to delete
return;
}
String key;
for (FileStatus fileStatus : arFileStatus) {
key = OBSCommonUtils.pathToKey(owner, fileStatus.getPath());
OBSCommonUtils.blockRootDelete(owner.getBucket(), key);
}
fsRemoveKeysByDepth(owner, arFileStatus);
}
// Batch delete sub objects one depth by one depth to avoid that parents and
// children in a same
// batch.
// A batch deletion might be split into some concurrent deletions to promote
// the performance, but
// it
// can't make sure that an object is deleted before it's children.
private static void fsRemoveKeysByDepth(final OBSFileSystem owner,
final FileStatus[] arFileStatus)
throws ObsException, IOException {
if (arFileStatus.length <= 0) {
// exit fast if there is no keys to delete
return;
}
// Find all leaf keys in the list.
String key;
int depth = Integer.MAX_VALUE;
List<KeyAndVersion> leafKeys = new ArrayList<>(
owner.getMaxEntriesToDelete());
for (int idx = arFileStatus.length - 1; idx >= 0; idx--) {
if (leafKeys.size() >= owner.getMaxEntriesToDelete()) {
OBSCommonUtils.removeKeys(owner, leafKeys, true, false);
}
key = OBSCommonUtils.pathToKey(owner, arFileStatus[idx].getPath());
// Check file.
if (!arFileStatus[idx].isDirectory()) {
// A file must be a leaf.
leafKeys.add(new KeyAndVersion(key, null));
continue;
}
// Check leaf folder at current depth.
int keyDepth = fsGetObjectKeyDepth(key);
if (keyDepth == depth) {
// Any key at current depth must be a leaf.
leafKeys.add(new KeyAndVersion(key, null));
continue;
}
if (keyDepth < depth) {
// The last batch delete at current depth.
OBSCommonUtils.removeKeys(owner, leafKeys, true, false);
// Go on at the upper depth.
depth = keyDepth;
leafKeys.add(new KeyAndVersion(key, null));
continue;
}
LOG.warn(
"The objects list is invalid because it isn't sorted by"
+ " path depth.");
throw new ObsException("System failure");
}
// The last batch delete at the minimum depth of all keys.
OBSCommonUtils.removeKeys(owner, leafKeys, true, false);
}
// Used to create a folder
static void fsCreateFolder(final OBSFileSystem owner,
final String objectName)
throws ObsException {
for (int retryTime = 1;
retryTime < OBSCommonUtils.MAX_RETRY_TIME; retryTime++) {
try {
innerFsCreateFolder(owner, objectName);
return;
} catch (ObsException e) {
LOG.warn("Failed to create folder [{}], retry time [{}], "
+ "exception [{}]", objectName, retryTime, e);
try {
Thread.sleep(OBSCommonUtils.DELAY_TIME);
} catch (InterruptedException ie) {
throw e;
}
}
}
innerFsCreateFolder(owner, objectName);
}
private static void innerFsCreateFolder(final OBSFileSystem owner,
final String objectName)
throws ObsException {
final NewFolderRequest newFolderRequest = new NewFolderRequest(
owner.getBucket(), objectName);
newFolderRequest.setAcl(owner.getCannedACL());
long len = newFolderRequest.getObjectKey().length();
owner.getObsClient().newFolder(newFolderRequest);
owner.getSchemeStatistics().incrementWriteOps(1);
owner.getSchemeStatistics().incrementBytesWritten(len);
}
// Used to get the status of a file or folder in a file-gateway bucket.
static OBSFileStatus innerFsGetObjectStatus(final OBSFileSystem owner,
final Path f) throws IOException {
final Path path = OBSCommonUtils.qualify(owner, f);
String key = OBSCommonUtils.pathToKey(owner, path);
LOG.debug("Getting path status for {} ({})", path, key);
if (key.isEmpty()) {
LOG.debug("Found root directory");
return new OBSFileStatus(path, owner.getUsername());
}
try {
final GetAttributeRequest getAttrRequest = new GetAttributeRequest(
owner.getBucket(), key);
ObsFSAttribute meta = owner.getObsClient()
.getAttribute(getAttrRequest);
owner.getSchemeStatistics().incrementReadOps(1);
if (fsIsFolder(meta)) {
LOG.debug("Found file (with /): fake directory");
return new OBSFileStatus(path,
OBSCommonUtils.dateToLong(meta.getLastModified()),
owner.getUsername());
} else {
LOG.debug(
"Found file (with /): real file? should not happen: {}",
key);
return new OBSFileStatus(
meta.getContentLength(),
OBSCommonUtils.dateToLong(meta.getLastModified()),
path,
owner.getDefaultBlockSize(path),
owner.getUsername());
}
} catch (ObsException e) {
if (e.getResponseCode() == OBSCommonUtils.NOT_FOUND_CODE) {
LOG.debug("Not Found: {}", path);
throw new FileNotFoundException(
"No such file or directory: " + path);
}
if (e.getResponseCode() == OBSCommonUtils.CONFLICT_CODE) {
throw new FileConflictException(
"file conflicts: " + e.getResponseStatus());
}
throw OBSCommonUtils.translateException("getFileStatus", path, e);
}
}
static ContentSummary fsGetDirectoryContentSummary(
final OBSFileSystem owner,
final String key) throws IOException {
String newKey = key;
newKey = OBSCommonUtils.maybeAddTrailingSlash(newKey);
long[] summary = {0, 0, 1};
LOG.debug("Summary key {}", newKey);
ListObjectsRequest request = new ListObjectsRequest();
request.setBucketName(owner.getBucket());
request.setPrefix(newKey);
request.setMaxKeys(owner.getMaxKeys());
ObjectListing objects = OBSCommonUtils.listObjects(owner, request);
while (true) {
if (!objects.getCommonPrefixes().isEmpty() || !objects.getObjects()
.isEmpty()) {
if (LOG.isDebugEnabled()) {
LOG.debug("Found path as directory (with /): {}/{}",
objects.getCommonPrefixes().size(),
objects.getObjects().size());
}
for (String prefix : objects.getCommonPrefixes()) {
if (!prefix.equals(newKey)) {
summary[2]++;
}
}
for (ObsObject obj : objects.getObjects()) {
if (!obj.getObjectKey().endsWith("/")) {
summary[0] += obj.getMetadata().getContentLength();
summary[1] += 1;
} else if (!obj.getObjectKey().equals(newKey)) {
summary[2]++;
}
}
}
if (!objects.isTruncated()) {
break;
}
objects = OBSCommonUtils.continueListObjects(owner, objects);
}
LOG.debug(String.format(
"file size [%d] - file count [%d] - directory count [%d] - "
+ "file path [%s]",
summary[0], summary[1], summary[2], newKey));
return new ContentSummary.Builder().length(summary[0])
.fileCount(summary[1]).directoryCount(summary[2])
.spaceConsumed(summary[0]).build();
}
}
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