hadoop ViewFs 源码
haddop ViewFs 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/ViewFs.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.viewfs;
import static org.apache.hadoop.fs.viewfs.Constants.CONFIG_VIEWFS_MOUNT_LINKS_AS_SYMLINKS;
import static org.apache.hadoop.fs.viewfs.Constants.CONFIG_VIEWFS_MOUNT_LINKS_AS_SYMLINKS_DEFAULT;
import static org.apache.hadoop.fs.viewfs.Constants.PERMISSION_555;
import java.util.function.Function;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.security.PrivilegedExceptionAction;
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import org.apache.hadoop.util.Preconditions;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.AbstractFileSystem;
import org.apache.hadoop.fs.BlockLocation;
import org.apache.hadoop.fs.BlockStoragePolicySpi;
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.FileChecksum;
import org.apache.hadoop.fs.FileContext;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FsConstants;
import org.apache.hadoop.fs.FsServerDefaults;
import org.apache.hadoop.fs.FsStatus;
import org.apache.hadoop.fs.LocatedFileStatus;
import org.apache.hadoop.fs.Options.ChecksumOpt;
import org.apache.hadoop.fs.ParentNotDirectoryException;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.RemoteIterator;
import org.apache.hadoop.fs.UnresolvedLinkException;
import org.apache.hadoop.fs.UnsupportedFileSystemException;
import org.apache.hadoop.fs.XAttrSetFlag;
import org.apache.hadoop.fs.local.LocalConfigKeys;
import org.apache.hadoop.fs.permission.AclEntry;
import org.apache.hadoop.fs.permission.AclUtil;
import org.apache.hadoop.fs.permission.AclStatus;
import org.apache.hadoop.fs.permission.FsAction;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.fs.viewfs.InodeTree.INode;
import org.apache.hadoop.fs.viewfs.InodeTree.INodeLink;
import org.apache.hadoop.security.AccessControlException;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.util.Progressable;
import org.apache.hadoop.util.Time;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* ViewFs (extends the AbstractFileSystem interface) implements a client-side
* mount table. The viewFs file system is implemented completely in memory on
* the client side. The client-side mount table allows a client to provide a
* customized view of a file system namespace that is composed from
* one or more individual file systems (a localFs or Hdfs, S3fs, etc).
* For example one could have a mount table that provides links such as
* <ul>
* <li> /user {@literal ->} hdfs://nnContainingUserDir/user
* <li> /project/foo {@literal ->} hdfs://nnProject1/projects/foo
* <li> /project/bar {@literal ->} hdfs://nnProject2/projects/bar
* <li> /tmp {@literal ->} hdfs://nnTmp/privateTmpForUserXXX
* </ul>
*
* ViewFs is specified with the following URI: <b>viewfs:///</b>
* <p>
* To use viewfs one would typically set the default file system in the
* config (i.e. fs.defaultFS {@literal <} = viewfs:///) along with the
* mount table config variables as described below.
*
* <p>
* <b> ** Config variables to specify the mount table entries ** </b>
* <p>
*
* The file system is initialized from the standard Hadoop config through
* config variables.
* See {@link FsConstants} for URI and Scheme constants;
* See {@link Constants} for config var constants;
* see {@link ConfigUtil} for convenient lib.
*
* <p>
* All the mount table config entries for view fs are prefixed by
* <b>fs.viewfs.mounttable.</b>
* For example the above example can be specified with the following
* config variables:
* <ul>
* <li> fs.viewfs.mounttable.default.link./user=
* hdfs://nnContainingUserDir/user
* <li> fs.viewfs.mounttable.default.link./project/foo=
* hdfs://nnProject1/projects/foo
* <li> fs.viewfs.mounttable.default.link./project/bar=
* hdfs://nnProject2/projects/bar
* <li> fs.viewfs.mounttable.default.link./tmp=
* hdfs://nnTmp/privateTmpForUserXXX
* </ul>
*
* The default mount table (when no authority is specified) is
* from config variables prefixed by <b>fs.viewFs.mounttable.default </b>
* The authority component of a URI can be used to specify a different mount
* table. For example,
* <ul>
* <li> viewfs://sanjayMountable/
* </ul>
* is initialized from fs.viewFs.mounttable.sanjayMountable.* config variables.
*
* <p>
* <b> **** Merge Mounts **** </b>(NOTE: merge mounts are not implemented yet.)
* <p>
*
* One can also use "MergeMounts" to merge several directories (this is
* sometimes called union-mounts or junction-mounts in the literature.
* For example of the home directories are stored on say two file systems
* (because they do not fit on one) then one could specify a mount
* entry such as following merges two dirs:
* <ul>
* <li> /user {@literal ->} hdfs://nnUser1/user,hdfs://nnUser2/user
* </ul>
* Such a mergeLink can be specified with the following config var where ","
* is used as the separator for each of links to be merged:
* <ul>
* <li> fs.viewfs.mounttable.default.linkMerge./user=
* hdfs://nnUser1/user,hdfs://nnUser1/user
* </ul>
* A special case of the merge mount is where mount table's root is merged
* with the root (slash) of another file system:
* <ul>
* <li> fs.viewfs.mounttable.default.linkMergeSlash=hdfs://nn99/
* </ul>
* In this cases the root of the mount table is merged with the root of
* <b>hdfs://nn99/ </b>
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving /*Evolving for a release,to be changed to Stable */
public class ViewFs extends AbstractFileSystem {
static final Logger LOG = LoggerFactory.getLogger(ViewFs.class);
final long creationTime; // of the the mount table
final UserGroupInformation ugi; // the user/group of user who created mtable
final Configuration config;
InodeTree<AbstractFileSystem> fsState; // the fs state; ie the mount table
Path homeDir = null;
private ViewFileSystem.RenameStrategy renameStrategy =
ViewFileSystem.RenameStrategy.SAME_MOUNTPOINT;
private static boolean showMountLinksAsSymlinks = true;
static AccessControlException readOnlyMountTable(final String operation,
final String p) {
return new AccessControlException(
"InternalDir of ViewFileSystem is readonly, operation " + operation +
" not permitted on path " + p + ".");
}
static AccessControlException readOnlyMountTable(final String operation,
final Path p) {
return readOnlyMountTable(operation, p.toString());
}
static public class MountPoint {
// the src of the mount
private Path src;
// Target of the mount; Multiple targets imply mergeMount
private String[] targets;
MountPoint(Path srcPath, String[] targetURIs) {
src = srcPath;
targets = targetURIs;
}
Path getSrc() {
return src;
}
String[] getTargets() {
return targets;
}
}
/**
* Returns the ViewFileSystem type.
*
* @return <code>viewfs</code>
*/
String getType() {
return FsConstants.VIEWFS_TYPE;
}
public ViewFs(final Configuration conf) throws IOException,
URISyntaxException {
this(FsConstants.VIEWFS_URI, conf);
}
/**
* This constructor has the signature needed by
* {@link AbstractFileSystem#createFileSystem(URI, Configuration)}.
*
* @param theUri which must be that of ViewFs
* @param conf
* @throws IOException
* @throws URISyntaxException
*/
ViewFs(final URI theUri, final Configuration conf) throws IOException,
URISyntaxException {
super(theUri, FsConstants.VIEWFS_SCHEME, false, -1);
creationTime = Time.now();
ugi = UserGroupInformation.getCurrentUser();
config = conf;
showMountLinksAsSymlinks = config
.getBoolean(CONFIG_VIEWFS_MOUNT_LINKS_AS_SYMLINKS,
CONFIG_VIEWFS_MOUNT_LINKS_AS_SYMLINKS_DEFAULT);
// Now build client side view (i.e. client side mount table) from config.
String authority = theUri.getAuthority();
boolean initingUriAsFallbackOnNoMounts =
!FsConstants.VIEWFS_TYPE.equals(getType());
fsState = new InodeTree<AbstractFileSystem>(conf, authority, theUri,
initingUriAsFallbackOnNoMounts) {
@Override
protected Function<URI, AbstractFileSystem> initAndGetTargetFs() {
return new Function<URI, AbstractFileSystem>() {
@Override
public AbstractFileSystem apply(final URI uri) {
AbstractFileSystem fs;
try {
fs = ugi.doAs(
new PrivilegedExceptionAction<AbstractFileSystem>() {
@Override
public AbstractFileSystem run() throws IOException {
return AbstractFileSystem.createFileSystem(uri, config);
}
});
String pathString = uri.getPath();
if (pathString.isEmpty()) {
pathString = "/";
}
return new ChRootedFs(fs, new Path(pathString));
} catch (IOException | URISyntaxException |
InterruptedException ex) {
LOG.error("Could not initialize underlying FileSystem object"
+" for uri " + uri + "with exception: " + ex.toString());
}
return null;
}
};
}
@Override
protected AbstractFileSystem getTargetFileSystem(
final INodeDir<AbstractFileSystem> dir) throws URISyntaxException {
return new InternalDirOfViewFs(dir, creationTime, ugi, getUri(), this,
config);
}
@Override
protected AbstractFileSystem getTargetFileSystem(final String settings,
final URI[] mergeFsURIList)
throws URISyntaxException, UnsupportedFileSystemException {
throw new UnsupportedFileSystemException("mergefs not implemented yet");
// return MergeFs.createMergeFs(mergeFsURIList, config);
}
};
renameStrategy = ViewFileSystem.RenameStrategy.valueOf(
conf.get(Constants.CONFIG_VIEWFS_RENAME_STRATEGY,
ViewFileSystem.RenameStrategy.SAME_MOUNTPOINT.toString()));
}
@Override
@Deprecated
public FsServerDefaults getServerDefaults() throws IOException {
return LocalConfigKeys.getServerDefaults();
}
@Override
public FsServerDefaults getServerDefaults(final Path f) throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res;
try {
res = fsState.resolve(getUriPath(f), true);
} catch (FileNotFoundException fnfe) {
return LocalConfigKeys.getServerDefaults();
}
return res.targetFileSystem.getServerDefaults(res.remainingPath);
}
@Override
public int getUriDefaultPort() {
return -1;
}
@Override
public Path getHomeDirectory() {
if (homeDir == null) {
String base = fsState.getHomeDirPrefixValue();
if (base == null) {
base = "/user";
}
homeDir = (base.equals("/") ?
this.makeQualified(new Path(base + ugi.getShortUserName())):
this.makeQualified(new Path(base + "/" + ugi.getShortUserName())));
}
return homeDir;
}
@Override
public Path resolvePath(final Path f) throws FileNotFoundException,
AccessControlException, UnresolvedLinkException, IOException {
final InodeTree.ResolveResult<AbstractFileSystem> res;
res = fsState.resolve(getUriPath(f), true);
if (res.isInternalDir()) {
return f;
}
return res.targetFileSystem.resolvePath(res.remainingPath);
}
@Override
public FSDataOutputStream createInternal(final Path f,
final EnumSet<CreateFlag> flag, final FsPermission absolutePermission,
final int bufferSize, final short replication, final long blockSize,
final Progressable progress, final ChecksumOpt checksumOpt,
final boolean createParent) throws AccessControlException,
FileAlreadyExistsException, FileNotFoundException,
ParentNotDirectoryException, UnsupportedFileSystemException,
UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res;
try {
res = fsState.resolve(getUriPath(f), false);
} catch (FileNotFoundException e) {
if (createParent) {
throw readOnlyMountTable("create", f);
} else {
throw e;
}
}
assert(res.remainingPath != null);
return res.targetFileSystem.createInternal(res.remainingPath, flag,
absolutePermission, bufferSize, replication,
blockSize, progress, checksumOpt,
createParent);
}
@Override
public boolean delete(final Path f, final boolean recursive)
throws AccessControlException, FileNotFoundException,
UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), true);
// If internal dir or target is a mount link (ie remainingPath is Slash)
if (res.isInternalDir() || res.remainingPath == InodeTree.SlashPath) {
throw new AccessControlException(
"Cannot delete internal mount table directory: " + f);
}
return res.targetFileSystem.delete(res.remainingPath, recursive);
}
@Override
public BlockLocation[] getFileBlockLocations(final Path f, final long start,
final long len) throws AccessControlException, FileNotFoundException,
UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), true);
return
res.targetFileSystem.getFileBlockLocations(res.remainingPath, start, len);
}
@Override
public FileChecksum getFileChecksum(final Path f)
throws AccessControlException, FileNotFoundException,
UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), true);
return res.targetFileSystem.getFileChecksum(res.remainingPath);
}
/**
* {@inheritDoc}
*
* If the given path is a symlink(mount link), the path will be resolved to a
* target path and it will get the resolved path's FileStatus object. It will
* not be represented as a symlink and isDirectory API returns true if the
* resolved path is a directory, false otherwise.
*/
@Override
public FileStatus getFileStatus(final Path f) throws AccessControlException,
FileNotFoundException, UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), true);
// FileStatus#getPath is a fully qualified path relative to the root of
// target file system.
// We need to change it to viewfs URI - relative to root of mount table.
// The implementors of RawLocalFileSystem were trying to be very smart.
// They implement FileStatus#getOwener lazily -- the object
// returned is really a RawLocalFileSystem that expect the
// FileStatus#getPath to be unchanged so that it can get owner when needed.
// Hence we need to interpose a new ViewFsFileStatus that works around.
FileStatus status = res.targetFileSystem.getFileStatus(res.remainingPath);
return new ViewFsFileStatus(status, this.makeQualified(f));
}
@Override
public void access(Path path, FsAction mode) throws AccessControlException,
FileNotFoundException, UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(path), true);
res.targetFileSystem.access(res.remainingPath, mode);
}
@Override
public FileStatus getFileLinkStatus(final Path f)
throws AccessControlException, FileNotFoundException,
UnsupportedFileSystemException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), false); // do not follow mount link
return res.targetFileSystem.getFileLinkStatus(res.remainingPath);
}
@Override
public FsStatus getFsStatus() throws AccessControlException,
FileNotFoundException, IOException {
return new FsStatus(0, 0, 0);
}
@Override
public RemoteIterator<FileStatus> listStatusIterator(final Path f)
throws AccessControlException, FileNotFoundException,
UnresolvedLinkException, IOException {
final InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), true);
final RemoteIterator<FileStatus> fsIter =
res.targetFileSystem.listStatusIterator(res.remainingPath);
if (res.isInternalDir()) {
return fsIter;
}
return new WrappingRemoteIterator<FileStatus>(res, fsIter, f) {
@Override
public FileStatus getViewFsFileStatus(FileStatus stat, Path newPath) {
return new ViewFsFileStatus(stat, newPath);
}
};
}
@Override
public RemoteIterator<LocatedFileStatus> listLocatedStatus(final Path f)
throws AccessControlException, FileNotFoundException,
UnresolvedLinkException, IOException {
final InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), true);
final RemoteIterator<LocatedFileStatus> fsIter =
res.targetFileSystem.listLocatedStatus(res.remainingPath);
if (res.isInternalDir()) {
return fsIter;
}
return new WrappingRemoteIterator<LocatedFileStatus>(res, fsIter, f) {
@Override
public LocatedFileStatus getViewFsFileStatus(LocatedFileStatus stat,
Path newPath) {
return new ViewFsLocatedFileStatus(stat, newPath);
}
};
}
/**
* {@inheritDoc}
*
* Note: listStatus considers listing from fallbackLink if available. If the
* same directory path is present in configured mount path as well as in
* fallback fs, then only the fallback path will be listed in the returned
* result except for link.
*
* If any of the the immediate children of the given path f is a symlink(mount
* link), the returned FileStatus object of that children would be represented
* as a symlink. It will not be resolved to the target path and will not get
* the target path FileStatus object. The target path will be available via
* getSymlink on that children's FileStatus object. Since it represents as
* symlink, isDirectory on that children's FileStatus will return false.
* This behavior can be changed by setting an advanced configuration
* fs.viewfs.mount.links.as.symlinks to false. In this case, mount points will
* be represented as non-symlinks and all the file/directory attributes like
* permissions, isDirectory etc will be assigned from it's resolved target
* directory/file.
*
* If you want to get the FileStatus of target path for that children, you may
* want to use GetFileStatus API with that children's symlink path. Please see
* {@link ViewFs#getFileStatus(Path f)}
*
* Note: In ViewFs, by default the mount links are represented as symlinks.
*/
@Override
public FileStatus[] listStatus(final Path f) throws AccessControlException,
FileNotFoundException, UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), true);
FileStatus[] statusLst = res.targetFileSystem.listStatus(res.remainingPath);
if (!res.isInternalDir()) {
// We need to change the name in the FileStatus as described in
// {@link #getFileStatus }
ChRootedFs targetFs;
targetFs = (ChRootedFs) res.targetFileSystem;
int i = 0;
for (FileStatus status : statusLst) {
String suffix = targetFs.stripOutRoot(status.getPath());
statusLst[i++] = new ViewFsFileStatus(status, this.makeQualified(
suffix.length() == 0 ? f : new Path(res.resolvedPath, suffix)));
}
}
return statusLst;
}
@Override
public void mkdir(final Path dir, final FsPermission permission,
final boolean createParent) throws AccessControlException,
FileAlreadyExistsException,
FileNotFoundException, UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(dir), false);
res.targetFileSystem.mkdir(res.remainingPath, permission, createParent);
}
@Override
public FSDataInputStream open(final Path f, final int bufferSize)
throws AccessControlException, FileNotFoundException,
UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), true);
return res.targetFileSystem.open(res.remainingPath, bufferSize);
}
@Override
public boolean truncate(final Path f, final long newLength)
throws AccessControlException, FileNotFoundException,
UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), true);
return res.targetFileSystem.truncate(res.remainingPath, newLength);
}
@Override
public void renameInternal(final Path src, final Path dst,
final boolean overwrite) throws IOException, UnresolvedLinkException {
// passing resolveLastComponet as false to catch renaming a mount point
// itself we need to catch this as an internal operation and fail if no
// fallback.
InodeTree.ResolveResult<AbstractFileSystem> resSrc =
fsState.resolve(getUriPath(src), false);
if (resSrc.isInternalDir()) {
if (fsState.getRootFallbackLink() == null) {
// If fallback is null, we can't rename from src.
throw new AccessControlException(
"Cannot Rename within internal dirs of mount table: src=" + src
+ " is readOnly");
}
InodeTree.ResolveResult<AbstractFileSystem> resSrcWithLastComp =
fsState.resolve(getUriPath(src), true);
if (resSrcWithLastComp.isInternalDir() || resSrcWithLastComp
.isLastInternalDirLink()) {
throw new AccessControlException(
"Cannot Rename within internal dirs of mount table: src=" + src
+ " is readOnly");
} else {
// This is fallback and let's set the src fs with this fallback
resSrc = resSrcWithLastComp;
}
}
InodeTree.ResolveResult<AbstractFileSystem> resDst =
fsState.resolve(getUriPath(dst), false);
if (resDst.isInternalDir()) {
if (fsState.getRootFallbackLink() == null) {
// If fallback is null, we can't rename to dst.
throw new AccessControlException(
"Cannot Rename within internal dirs of mount table: dest=" + dst
+ " is readOnly");
}
// if the fallback exist, we may have chance to rename to fallback path
// where dst parent is matching to internalDir.
InodeTree.ResolveResult<AbstractFileSystem> resDstWithLastComp =
fsState.resolve(getUriPath(dst), true);
if (resDstWithLastComp.isInternalDir()) {
// We need to get fallback here. If matching fallback path not exist, it
// will fail later. This is a very special case: Even though we are on
// internal directory, we should allow to rename, so that src files will
// moved under matching fallback dir.
resDst = new InodeTree.ResolveResult<AbstractFileSystem>(
InodeTree.ResultKind.INTERNAL_DIR,
fsState.getRootFallbackLink().getTargetFileSystem(), "/",
new Path(resDstWithLastComp.resolvedPath), false);
} else {
// The link resolved to some target fs or fallback fs.
resDst = resDstWithLastComp;
}
}
//Alternate 1: renames within same file system
URI srcUri = resSrc.targetFileSystem.getUri();
URI dstUri = resDst.targetFileSystem.getUri();
ViewFileSystem.verifyRenameStrategy(srcUri, dstUri,
resSrc.targetFileSystem == resDst.targetFileSystem, renameStrategy);
ChRootedFs srcFS = (ChRootedFs) resSrc.targetFileSystem;
ChRootedFs dstFS = (ChRootedFs) resDst.targetFileSystem;
srcFS.getMyFs().renameInternal(srcFS.fullPath(resSrc.remainingPath),
dstFS.fullPath(resDst.remainingPath), overwrite);
}
@Override
public void renameInternal(final Path src, final Path dst)
throws AccessControlException, FileAlreadyExistsException,
FileNotFoundException, ParentNotDirectoryException,
UnresolvedLinkException, IOException {
renameInternal(src, dst, false);
}
@Override
public boolean supportsSymlinks() {
return true;
}
@Override
public void createSymlink(final Path target, final Path link,
final boolean createParent) throws IOException, UnresolvedLinkException {
InodeTree.ResolveResult<AbstractFileSystem> res;
try {
res = fsState.resolve(getUriPath(link), false);
} catch (FileNotFoundException e) {
if (createParent) {
throw readOnlyMountTable("createSymlink", link);
} else {
throw e;
}
}
assert(res.remainingPath != null);
res.targetFileSystem.createSymlink(target, res.remainingPath,
createParent);
}
@Override
public Path getLinkTarget(final Path f) throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), false); // do not follow mount link
return res.targetFileSystem.getLinkTarget(res.remainingPath);
}
@Override
public void setOwner(final Path f, final String username,
final String groupname) throws AccessControlException,
FileNotFoundException, UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), true);
res.targetFileSystem.setOwner(res.remainingPath, username, groupname);
}
@Override
public void setPermission(final Path f, final FsPermission permission)
throws AccessControlException, FileNotFoundException,
UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), true);
res.targetFileSystem.setPermission(res.remainingPath, permission);
}
@Override
public boolean setReplication(final Path f, final short replication)
throws AccessControlException, FileNotFoundException,
UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), true);
return res.targetFileSystem.setReplication(res.remainingPath, replication);
}
@Override
public void setTimes(final Path f, final long mtime, final long atime)
throws AccessControlException, FileNotFoundException,
UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), true);
res.targetFileSystem.setTimes(res.remainingPath, mtime, atime);
}
@Override
public void setVerifyChecksum(final boolean verifyChecksum)
throws AccessControlException, IOException {
// This is a file system level operations, however ViewFs
// points to many file systems. Noop for ViewFs.
}
public MountPoint[] getMountPoints() {
List<InodeTree.MountPoint<AbstractFileSystem>> mountPoints =
fsState.getMountPoints();
MountPoint[] result = new MountPoint[mountPoints.size()];
for ( int i = 0; i < mountPoints.size(); ++i ) {
result[i] = new MountPoint(new Path(mountPoints.get(i).src),
mountPoints.get(i).target.targetDirLinkList);
}
return result;
}
@Override
public List<Token<?>> getDelegationTokens(String renewer) throws IOException {
List<InodeTree.MountPoint<AbstractFileSystem>> mountPoints =
fsState.getMountPoints();
int initialListSize = 0;
for (InodeTree.MountPoint<AbstractFileSystem> im : mountPoints) {
initialListSize += im.target.targetDirLinkList.length;
}
List<Token<?>> result = new ArrayList<Token<?>>(initialListSize);
for ( int i = 0; i < mountPoints.size(); ++i ) {
List<Token<?>> tokens =
mountPoints.get(i).target.getTargetFileSystem()
.getDelegationTokens(renewer);
if (tokens != null) {
result.addAll(tokens);
}
}
// Add tokens from fallback FS
if (this.fsState.getRootFallbackLink() != null) {
AbstractFileSystem rootFallbackFs =
this.fsState.getRootFallbackLink().getTargetFileSystem();
List<Token<?>> tokens = rootFallbackFs.getDelegationTokens(renewer);
if (tokens != null) {
result.addAll(tokens);
}
}
return result;
}
@Override
public boolean isValidName(String src) {
// Prefix validated at mount time and rest of path validated by mount
// target.
return true;
}
@Override
public void modifyAclEntries(Path path, List<AclEntry> aclSpec)
throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(path), true);
res.targetFileSystem.modifyAclEntries(res.remainingPath, aclSpec);
}
@Override
public void removeAclEntries(Path path, List<AclEntry> aclSpec)
throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(path), true);
res.targetFileSystem.removeAclEntries(res.remainingPath, aclSpec);
}
@Override
public void removeDefaultAcl(Path path)
throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(path), true);
res.targetFileSystem.removeDefaultAcl(res.remainingPath);
}
@Override
public void removeAcl(Path path)
throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(path), true);
res.targetFileSystem.removeAcl(res.remainingPath);
}
@Override
public void setAcl(Path path, List<AclEntry> aclSpec) throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(path), true);
res.targetFileSystem.setAcl(res.remainingPath, aclSpec);
}
@Override
public AclStatus getAclStatus(Path path) throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(path), true);
return res.targetFileSystem.getAclStatus(res.remainingPath);
}
@Override
public void setXAttr(Path path, String name, byte[] value,
EnumSet<XAttrSetFlag> flag) throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(path), true);
res.targetFileSystem.setXAttr(res.remainingPath, name, value, flag);
}
@Override
public byte[] getXAttr(Path path, String name) throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(path), true);
return res.targetFileSystem.getXAttr(res.remainingPath, name);
}
@Override
public Map<String, byte[]> getXAttrs(Path path) throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(path), true);
return res.targetFileSystem.getXAttrs(res.remainingPath);
}
@Override
public Map<String, byte[]> getXAttrs(Path path, List<String> names)
throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(path), true);
return res.targetFileSystem.getXAttrs(res.remainingPath, names);
}
@Override
public List<String> listXAttrs(Path path) throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(path), true);
return res.targetFileSystem.listXAttrs(res.remainingPath);
}
@Override
public void removeXAttr(Path path, String name) throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(path), true);
res.targetFileSystem.removeXAttr(res.remainingPath, name);
}
@Override
public Path createSnapshot(Path path, String snapshotName)
throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res = fsState.resolve(
getUriPath(path), true);
return res.targetFileSystem.createSnapshot(res.remainingPath, snapshotName);
}
@Override
public void renameSnapshot(Path path, String snapshotOldName,
String snapshotNewName) throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res = fsState.resolve(
getUriPath(path), true);
res.targetFileSystem.renameSnapshot(res.remainingPath, snapshotOldName,
snapshotNewName);
}
@Override
public void deleteSnapshot(Path path, String snapshotName) throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res = fsState.resolve(
getUriPath(path), true);
res.targetFileSystem.deleteSnapshot(res.remainingPath, snapshotName);
}
@Override
public void satisfyStoragePolicy(final Path path) throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(path), true);
res.targetFileSystem.satisfyStoragePolicy(res.remainingPath);
}
@Override
public void setStoragePolicy(final Path path, final String policyName)
throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(path), true);
res.targetFileSystem.setStoragePolicy(res.remainingPath, policyName);
}
@Override
public void unsetStoragePolicy(final Path src)
throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(src), true);
res.targetFileSystem.unsetStoragePolicy(res.remainingPath);
}
/**
* Retrieve the storage policy for a given file or directory.
*
* @param src file or directory path.
* @return storage policy for give file.
* @throws IOException raised on errors performing I/O.
*/
public BlockStoragePolicySpi getStoragePolicy(final Path src)
throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(src), true);
return res.targetFileSystem.getStoragePolicy(res.remainingPath);
}
/**
* Helper class to perform some transformation on results returned
* from a RemoteIterator.
*/
private abstract class WrappingRemoteIterator<T extends FileStatus>
implements RemoteIterator<T> {
private final String resolvedPath;
private final ChRootedFs targetFs;
private final RemoteIterator<T> innerIter;
private final Path originalPath;
WrappingRemoteIterator(InodeTree.ResolveResult<AbstractFileSystem> res,
RemoteIterator<T> innerIter, Path originalPath) {
this.resolvedPath = res.resolvedPath;
this.targetFs = (ChRootedFs)res.targetFileSystem;
this.innerIter = innerIter;
this.originalPath = originalPath;
}
@Override
public boolean hasNext() throws IOException {
return innerIter.hasNext();
}
@Override
public T next() throws IOException {
T status = innerIter.next();
String suffix = targetFs.stripOutRoot(status.getPath());
Path newPath = makeQualified(suffix.length() == 0 ? originalPath
: new Path(resolvedPath, suffix));
return getViewFsFileStatus(status, newPath);
}
protected abstract T getViewFsFileStatus(T status, Path newPath);
}
/*
* An instance of this class represents an internal dir of the viewFs
* ie internal dir of the mount table.
* It is a ready only mount tbale and create, mkdir or delete operations
* are not allowed.
* If called on create or mkdir then this target is the parent of the
* directory in which one is trying to create or mkdir; hence
* in this case the path name passed in is the last component.
* Otherwise this target is the end point of the path and hence
* the path name passed in is null.
*/
static class InternalDirOfViewFs extends AbstractFileSystem {
final InodeTree.INodeDir<AbstractFileSystem> theInternalDir;
final long creationTime; // of the the mount table
final UserGroupInformation ugi; // the user/group of user who created mtable
final URI myUri; // the URI of the outer ViewFs
private InodeTree<AbstractFileSystem> fsState;
private Configuration conf;
public InternalDirOfViewFs(final InodeTree.INodeDir<AbstractFileSystem> dir,
final long cTime, final UserGroupInformation ugi, final URI uri,
InodeTree fsState, Configuration conf)
throws URISyntaxException {
super(FsConstants.VIEWFS_URI, FsConstants.VIEWFS_SCHEME, false, -1);
theInternalDir = dir;
creationTime = cTime;
this.ugi = ugi;
myUri = uri;
this.fsState = fsState;
this.conf = conf;
}
static private void checkPathIsSlash(final Path f) throws IOException {
if (f != InodeTree.SlashPath) {
throw new IOException (
"Internal implementation error: expected file name to be /" );
}
}
@Override
public FSDataOutputStream createInternal(final Path f,
final EnumSet<CreateFlag> flag, final FsPermission absolutePermission,
final int bufferSize, final short replication, final long blockSize,
final Progressable progress, final ChecksumOpt checksumOpt,
final boolean createParent) throws AccessControlException,
FileAlreadyExistsException, FileNotFoundException,
ParentNotDirectoryException, UnsupportedFileSystemException,
UnresolvedLinkException, IOException {
Preconditions.checkNotNull(f, "File cannot be null.");
if (InodeTree.SlashPath.equals(f)) {
throw new FileAlreadyExistsException(
"/ is not a file. The directory / already exist at: "
+ theInternalDir.fullPath);
}
if (this.fsState.getRootFallbackLink() != null) {
if (theInternalDir.getChildren().containsKey(f.getName())) {
throw new FileAlreadyExistsException(
"A mount path(file/dir) already exist with the requested path: "
+ theInternalDir.getChildren().get(f.getName()).fullPath);
}
AbstractFileSystem linkedFallbackFs =
this.fsState.getRootFallbackLink().getTargetFileSystem();
Path parent = Path.getPathWithoutSchemeAndAuthority(
new Path(theInternalDir.fullPath));
String leaf = f.getName();
Path fileToCreate = new Path(parent, leaf);
try {
return linkedFallbackFs
.createInternal(fileToCreate, flag, absolutePermission,
bufferSize, replication, blockSize, progress, checksumOpt,
true);
} catch (IOException e) {
StringBuilder msg =
new StringBuilder("Failed to create file:").append(fileToCreate)
.append(" at fallback : ").append(linkedFallbackFs.getUri());
LOG.error(msg.toString(), e);
throw e;
}
}
throw readOnlyMountTable("create", f);
}
@Override
public boolean delete(final Path f, final boolean recursive)
throws AccessControlException, IOException {
checkPathIsSlash(f);
throw readOnlyMountTable("delete", f);
}
@Override
public BlockLocation[] getFileBlockLocations(final Path f, final long start,
final long len) throws FileNotFoundException, IOException {
// When application calls listFiles on internalDir, it would return
// RemoteIterator from InternalDirOfViewFs. If there is a fallBack, there
// is a chance of files exists under that internalDir in fallback.
// Iterator#next will call getFileBlockLocations with that files. So, we
// should return getFileBlockLocations on fallback. See HDFS-15532.
if (!InodeTree.SlashPath.equals(f) && this.fsState
.getRootFallbackLink() != null) {
AbstractFileSystem linkedFallbackFs =
this.fsState.getRootFallbackLink().getTargetFileSystem();
Path parent = Path.getPathWithoutSchemeAndAuthority(
new Path(theInternalDir.fullPath));
Path pathToFallbackFs = new Path(parent, f.getName());
return linkedFallbackFs
.getFileBlockLocations(pathToFallbackFs, start, len);
}
checkPathIsSlash(f);
throw new FileNotFoundException("Path points to dir not a file");
}
@Override
public FileChecksum getFileChecksum(final Path f)
throws FileNotFoundException, IOException {
checkPathIsSlash(f);
throw new FileNotFoundException("Path points to dir not a file");
}
@Override
public FileStatus getFileStatus(final Path f) throws IOException {
checkPathIsSlash(f);
return new FileStatus(0, true, 0, 0, creationTime, creationTime,
PERMISSION_555, ugi.getShortUserName(), ugi.getPrimaryGroupName(),
new Path(theInternalDir.fullPath).makeQualified(
myUri, null));
}
@Override
public FileStatus getFileLinkStatus(final Path f)
throws IOException {
// look up i internalDirs children - ignore first Slash
INode<AbstractFileSystem> inode =
theInternalDir.getChildren().get(f.toUri().toString().substring(1));
if (inode == null) {
throw new FileNotFoundException(
"viewFs internal mount table - missing entry:" + f);
}
FileStatus result;
if (inode.isLink()) {
INodeLink<AbstractFileSystem> inodelink = inode.getLink();
try {
String linkedPath = inodelink.getTargetFileSystem()
.getUri().getPath();
FileStatus status = ((ChRootedFs)inodelink.getTargetFileSystem())
.getMyFs().getFileStatus(new Path(linkedPath));
result = new FileStatus(status.getLen(), false,
status.getReplication(), status.getBlockSize(),
status.getModificationTime(), status.getAccessTime(),
status.getPermission(), status.getOwner(), status.getGroup(),
inodelink.getTargetLink(),
new Path(inode.fullPath).makeQualified(
myUri, null));
} catch (FileNotFoundException ex) {
result = new FileStatus(0, false, 0, 0, creationTime, creationTime,
PERMISSION_555, ugi.getShortUserName(), ugi.getPrimaryGroupName(),
inodelink.getTargetLink(),
new Path(inode.fullPath).makeQualified(
myUri, null));
}
} else {
result = new FileStatus(0, true, 0, 0, creationTime, creationTime,
PERMISSION_555, ugi.getShortUserName(), ugi.getPrimaryGroupName(),
new Path(inode.fullPath).makeQualified(
myUri, null));
}
return result;
}
@Override
public FsStatus getFsStatus() {
return new FsStatus(0, 0, 0);
}
@Override
@Deprecated
public FsServerDefaults getServerDefaults() throws IOException {
return LocalConfigKeys.getServerDefaults();
}
@Override
public FsServerDefaults getServerDefaults(final Path f) throws IOException {
return LocalConfigKeys.getServerDefaults();
}
@Override
public int getUriDefaultPort() {
return -1;
}
/**
* {@inheritDoc}
*
* Note: listStatus on root("/") considers listing from fallbackLink if
* available. If the same directory name is present in configured mount
* path as well as in fallback link, then only the configured mount path
* will be listed in the returned result.
*/
@Override
public FileStatus[] listStatus(final Path f) throws IOException {
checkPathIsSlash(f);
FileStatus[] fallbackStatuses = listStatusForFallbackLink();
Set<FileStatus> linkStatuses = new HashSet<>();
Set<FileStatus> internalDirStatuses = new HashSet<>();
int i = 0;
for (Entry<String, INode<AbstractFileSystem>> iEntry :
theInternalDir.getChildren().entrySet()) {
INode<AbstractFileSystem> inode = iEntry.getValue();
Path path = new Path(inode.fullPath).makeQualified(myUri, null);
if (inode.isLink()) {
INodeLink<AbstractFileSystem> link = inode.getLink();
if (showMountLinksAsSymlinks) {
// To maintain backward compatibility, with default option(showing
// mount links as symlinks), we will represent target link as
// symlink and rest other properties are belongs to mount link only.
linkStatuses.add(
new FileStatus(0, false, 0, 0, creationTime, creationTime,
PERMISSION_555, ugi.getShortUserName(),
ugi.getPrimaryGroupName(), link.getTargetLink(), path));
continue;
}
// We will represent as non-symlinks. Here it will show target
// directory/file properties like permissions, isDirectory etc on
// mount path. The path will be a mount link path and isDirectory is
// true if target is dir, otherwise false.
String linkedPath = link.getTargetFileSystem().getUri().getPath();
if ("".equals(linkedPath)) {
linkedPath = "/";
}
try {
FileStatus status =
((ChRootedFs) link.getTargetFileSystem()).getMyFs()
.getFileStatus(new Path(linkedPath));
linkStatuses.add(
new FileStatus(status.getLen(), status.isDirectory(),
status.getReplication(), status.getBlockSize(),
status.getModificationTime(), status.getAccessTime(),
status.getPermission(), status.getOwner(),
status.getGroup(), null, path));
} catch (FileNotFoundException ex) {
LOG.warn("Cannot get one of the children's(" + path
+ ") target path(" + link.getTargetFileSystem().getUri()
+ ") file status.", ex);
throw ex;
}
} else {
internalDirStatuses.add(
new FileStatus(0, true, 0, 0, creationTime, creationTime,
PERMISSION_555, ugi.getShortUserName(),
ugi.getPrimaryGroupName(), path));
}
}
FileStatus[] internalDirStatusesMergedWithFallBack = internalDirStatuses
.toArray(new FileStatus[internalDirStatuses.size()]);
if (fallbackStatuses.length > 0) {
internalDirStatusesMergedWithFallBack =
merge(fallbackStatuses, internalDirStatusesMergedWithFallBack);
}
// Links will always have precedence than internalDir or fallback paths.
return merge(linkStatuses.toArray(new FileStatus[linkStatuses.size()]),
internalDirStatusesMergedWithFallBack);
}
private FileStatus[] merge(FileStatus[] toStatuses,
FileStatus[] fromStatuses) {
ArrayList<FileStatus> result = new ArrayList<>();
Set<String> pathSet = new HashSet<>();
for (FileStatus status : toStatuses) {
result.add(status);
pathSet.add(status.getPath().getName());
}
for (FileStatus status : fromStatuses) {
if (!pathSet.contains(status.getPath().getName())) {
result.add(status);
}
}
return result.toArray(new FileStatus[result.size()]);
}
private FileStatus[] listStatusForFallbackLink() throws IOException {
if (fsState.getRootFallbackLink() != null) {
AbstractFileSystem linkedFallbackFs =
fsState.getRootFallbackLink().getTargetFileSystem();
Path p = Path.getPathWithoutSchemeAndAuthority(
new Path(theInternalDir.fullPath));
if (theInternalDir.isRoot() || FileContext
.getFileContext(linkedFallbackFs, conf).util().exists(p)) {
// Fallback link is only applicable for root
FileStatus[] statuses = linkedFallbackFs.listStatus(p);
for (FileStatus status : statuses) {
// Fix the path back to viewfs scheme
Path pathFromConfiguredFallbackRoot =
new Path(p, status.getPath().getName());
status.setPath(
new Path(myUri.toString(), pathFromConfiguredFallbackRoot));
}
return statuses;
}
}
return new FileStatus[0];
}
@Override
public void mkdir(final Path dir, final FsPermission permission,
final boolean createParent) throws IOException {
if (theInternalDir.isRoot() && dir == null) {
throw new FileAlreadyExistsException("/ already exits");
}
if (this.fsState.getRootFallbackLink() != null) {
AbstractFileSystem linkedFallbackFs =
this.fsState.getRootFallbackLink().getTargetFileSystem();
Path parent = Path.getPathWithoutSchemeAndAuthority(
new Path(theInternalDir.fullPath));
String leafChild = (InodeTree.SlashPath.equals(dir)) ?
InodeTree.SlashPath.toString() :
dir.getName();
Path dirToCreate = new Path(parent, leafChild);
try {
// We are here because, the parent dir already exist in the mount
// table internal tree. So, let's create parent always in fallback.
linkedFallbackFs.mkdir(dirToCreate, permission, true);
return;
} catch (IOException e) {
if (LOG.isDebugEnabled()) {
StringBuilder msg = new StringBuilder("Failed to create {}")
.append(" at fallback fs : {}");
LOG.debug(msg.toString(), dirToCreate, linkedFallbackFs.getUri());
}
throw e;
}
}
throw readOnlyMountTable("mkdir", dir);
}
@Override
public FSDataInputStream open(final Path f, final int bufferSize)
throws FileNotFoundException, IOException {
checkPathIsSlash(f);
throw new FileNotFoundException("Path points to dir not a file");
}
@Override
public boolean truncate(final Path f, final long newLength)
throws FileNotFoundException, IOException {
checkPathIsSlash(f);
throw readOnlyMountTable("truncate", f);
}
@Override
public void renameInternal(final Path src, final Path dst)
throws AccessControlException, IOException {
checkPathIsSlash(src);
checkPathIsSlash(dst);
throw readOnlyMountTable("rename", src);
}
@Override
public boolean supportsSymlinks() {
return true;
}
@Override
public void createSymlink(final Path target, final Path link,
final boolean createParent) throws AccessControlException {
throw readOnlyMountTable("createSymlink", link);
}
@Override
public Path getLinkTarget(final Path f) throws FileNotFoundException,
IOException {
return getFileLinkStatus(f).getSymlink();
}
@Override
public void setOwner(final Path f, final String username,
final String groupname) throws AccessControlException, IOException {
checkPathIsSlash(f);
throw readOnlyMountTable("setOwner", f);
}
@Override
public void setPermission(final Path f, final FsPermission permission)
throws AccessControlException, IOException {
checkPathIsSlash(f);
throw readOnlyMountTable("setPermission", f);
}
@Override
public boolean setReplication(final Path f, final short replication)
throws AccessControlException, IOException {
checkPathIsSlash(f);
throw readOnlyMountTable("setReplication", f);
}
@Override
public void setTimes(final Path f, final long mtime, final long atime)
throws AccessControlException, IOException {
checkPathIsSlash(f);
throw readOnlyMountTable("setTimes", f);
}
@Override
public void setVerifyChecksum(final boolean verifyChecksum)
throws AccessControlException {
throw readOnlyMountTable("setVerifyChecksum", "");
}
@Override
public void modifyAclEntries(Path path, List<AclEntry> aclSpec)
throws IOException {
checkPathIsSlash(path);
throw readOnlyMountTable("modifyAclEntries", path);
}
@Override
public void removeAclEntries(Path path, List<AclEntry> aclSpec)
throws IOException {
checkPathIsSlash(path);
throw readOnlyMountTable("removeAclEntries", path);
}
@Override
public void removeDefaultAcl(Path path) throws IOException {
checkPathIsSlash(path);
throw readOnlyMountTable("removeDefaultAcl", path);
}
@Override
public void removeAcl(Path path) throws IOException {
checkPathIsSlash(path);
throw readOnlyMountTable("removeAcl", path);
}
@Override
public void setAcl(Path path, List<AclEntry> aclSpec) throws IOException {
checkPathIsSlash(path);
throw readOnlyMountTable("setAcl", path);
}
@Override
public AclStatus getAclStatus(Path path) throws IOException {
checkPathIsSlash(path);
return new AclStatus.Builder().owner(ugi.getShortUserName())
.group(ugi.getPrimaryGroupName())
.addEntries(AclUtil.getMinimalAcl(PERMISSION_555))
.stickyBit(false).build();
}
@Override
public void setXAttr(Path path, String name, byte[] value,
EnumSet<XAttrSetFlag> flag) throws IOException {
checkPathIsSlash(path);
throw readOnlyMountTable("setXAttr", path);
}
@Override
public byte[] getXAttr(Path path, String name) throws IOException {
throw new NotInMountpointException(path, "getXAttr");
}
@Override
public Map<String, byte[]> getXAttrs(Path path) throws IOException {
throw new NotInMountpointException(path, "getXAttrs");
}
@Override
public Map<String, byte[]> getXAttrs(Path path, List<String> names)
throws IOException {
throw new NotInMountpointException(path, "getXAttrs");
}
@Override
public List<String> listXAttrs(Path path) throws IOException {
throw new NotInMountpointException(path, "listXAttrs");
}
@Override
public void removeXAttr(Path path, String name) throws IOException {
checkPathIsSlash(path);
throw readOnlyMountTable("removeXAttr", path);
}
@Override
public Path createSnapshot(Path path, String snapshotName)
throws IOException {
checkPathIsSlash(path);
throw readOnlyMountTable("createSnapshot", path);
}
@Override
public void renameSnapshot(Path path, String snapshotOldName,
String snapshotNewName) throws IOException {
checkPathIsSlash(path);
throw readOnlyMountTable("renameSnapshot", path);
}
@Override
public void deleteSnapshot(Path path, String snapshotName)
throws IOException {
checkPathIsSlash(path);
throw readOnlyMountTable("deleteSnapshot", path);
}
@Override
public void satisfyStoragePolicy(final Path path) throws IOException {
throw readOnlyMountTable("satisfyStoragePolicy", path);
}
@Override
public void setStoragePolicy(Path path, String policyName)
throws IOException {
throw readOnlyMountTable("setStoragePolicy", path);
}
}
}
相关信息
相关文章
hadoop HCFSMountTableConfigLoader 源码
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
8、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦