/**
* 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.hdfs;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.URI;
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.List;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.BlockLocation;
import org.apache.hadoop.fs.BlockStorageLocation;
import org.apache.hadoop.fs.ContentSummary;
import org.apache.hadoop.fs.CreateFlag;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FSLinkResolver;
import org.apache.hadoop.fs.FileAlreadyExistsException;
import org.apache.hadoop.fs.FileChecksum;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileSystemLinkResolver;
import org.apache.hadoop.fs.FsServerDefaults;
import org.apache.hadoop.fs.FsStatus;
import org.apache.hadoop.fs.LocatedFileStatus;
import org.apache.hadoop.fs.Options;
import org.apache.hadoop.fs.Options.ChecksumOpt;
import org.apache.hadoop.fs.ParentNotDirectoryException;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathFilter;
import org.apache.hadoop.fs.RemoteIterator;
import org.apache.hadoop.fs.UnresolvedLinkException;
import org.apache.hadoop.fs.UnsupportedFileSystemException;
import org.apache.hadoop.fs.VolumeId;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.hdfs.client.HdfsAdmin;
import org.apache.hadoop.hdfs.client.HdfsDataInputStream;
import org.apache.hadoop.hdfs.client.HdfsDataOutputStream;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.protocol.DirectoryListing;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.DatanodeReportType;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.SafeModeAction;
import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
import org.apache.hadoop.hdfs.protocol.HdfsLocatedFileStatus;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport;
import org.apache.hadoop.hdfs.protocol.SnapshottableDirectoryStatus;
import org.apache.hadoop.hdfs.security.token.block.InvalidBlockTokenException;
import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;
import org.apache.hadoop.hdfs.server.namenode.NameNode;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.security.AccessControlException;
import org.apache.hadoop.security.token.SecretManager.InvalidToken;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.util.Progressable;
import com.google.common.annotations.VisibleForTesting;
/****************************************************************
* Implementation of the abstract FileSystem for the DFS system.
* This object is the way end-user code interacts with a Hadoop
* DistributedFileSystem.
*
*****************************************************************/
@InterfaceAudience.LimitedPrivate({ "MapReduce", "HBase" })
@InterfaceStability.Unstable
public class DistributedFileSystem extends FileSystem {
private Path workingDir;
private URI uri;
DFSClient dfs;
private boolean verifyChecksum = true;
static{
HdfsConfiguration.init();
}
public DistributedFileSystem() {
}
/**
* Return the protocol scheme for the FileSystem.
* <p/>
*
* @return <code>hdfs</code>
*/
@Override
public String getScheme() {
return HdfsConstants.HDFS_URI_SCHEME;
}
@Deprecated
public DistributedFileSystem(InetSocketAddress namenode,
Configuration conf) throws IOException {
initialize(NameNode.getUri(namenode), conf);
}
@Override
public URI getUri() { return uri; }
@Override
public void initialize(URI uri, Configuration conf) throws IOException {
super.initialize(uri, conf);
setConf(conf);
String host = uri.getHost();
if (host == null) {
throw new IOException("Incomplete HDFS URI, no host: "+ uri);
}
this.dfs = new DFSClient(uri, conf, statistics);
this.uri = URI.create(uri.getScheme()+"://"+uri.getAuthority());
this.workingDir = getHomeDirectory();
}
@Override
public Path getWorkingDirectory() {
return workingDir;
}
@Override
public long getDefaultBlockSize() {
return dfs.getDefaultBlockSize();
}
@Override
public short getDefaultReplication() {
return dfs.getDefaultReplication();
}
@Override
public void setWorkingDirectory(Path dir) {
String result = fixRelativePart(dir).toUri().getPath();
if (!DFSUtil.isValidName(result)) {
throw new IllegalArgumentException("Invalid DFS directory name " +
result);
}
workingDir = fixRelativePart(dir);
}
@Override
public Path getHomeDirectory() {
return makeQualified(new Path("/user/" + dfs.ugi.getShortUserName()));
}
/**
* Checks that the passed URI belongs to this filesystem and returns
* just the path component. Expects a URI with an absolute path.
*
* @param file URI with absolute path
* @return path component of {file}
* @throws IllegalArgumentException if URI does not belong to this DFS
*/
private String getPathName(Path file) {
checkPath(file);
String result = file.toUri().getPath();
if (!DFSUtil.isValidName(result)) {
throw new IllegalArgumentException("Pathname " + result + " from " +
file+" is not a valid DFS filename.");
}
return result;
}
@Override
public BlockLocation[] getFileBlockLocations(FileStatus file, long start,
long len) throws IOException {
if (file == null) {
return null;
}
return getFileBlockLocations(file.getPath(), start, len);
}
@Override
public BlockLocation[] getFileBlockLocations(Path p,
final long start, final long len) throws IOException {
statistics.incrementReadOps(1);
final Path absF = fixRelativePart(p);
return new FileSystemLinkResolver<BlockLocation[]>() {
@Override
public BlockLocation[] doCall(final Path p)
throws IOException, UnresolvedLinkException {
return dfs.getBlockLocations(getPathName(p), start, len);
}
@Override
public BlockLocation[] next(final FileSystem fs, final Path p)
throws IOException {
return fs.getFileBlockLocations(p, start, len);
}
}.resolve(this, absF);
}
/**
* Used to query storage location information for a list of blocks. This list
* of blocks is normally constructed via a series of calls to
* {@link DistributedFileSystem#getFileBlockLocations(Path, long, long)} to
* get the blocks for ranges of a file.
*
* The returned array of {@link BlockStorageLocation} augments
* {@link BlockLocation} with a {@link VolumeId} per block replica. The
* VolumeId specifies the volume on the datanode on which the replica resides.
* The VolumeId has to be checked via {@link VolumeId#isValid()} before being
* used because volume information can be unavailable if the corresponding
* datanode is down or if the requested block is not found.
*
* This API is unstable, and datanode-side support is disabled by default. It
* can be enabled by setting "dfs.datanode.hdfs-blocks-metadata.enabled" to
* true.
*
* @param blocks
* List of target BlockLocations to query volume location information
* @return volumeBlockLocations Augmented array of
* {@link BlockStorageLocation}s containing additional volume location
* information for each replica of each block.
*/
@InterfaceStability.Unstable
public BlockStorageLocation[] getFileBlockStorageLocations(
List<BlockLocation> blocks) throws IOException,
UnsupportedOperationException, InvalidBlockTokenException {
return dfs.getBlockStorageLocations(blocks);
}
@Override
public void setVerifyChecksum(boolean verifyChecksum) {
this.verifyChecksum = verifyChecksum;
}
/**
* Start the lease recovery of a file
*
* @param f a file
* @return true if the file is already closed
* @throws IOException if an error occurs
*/
public boolean recoverLease(final Path f) throws IOException {
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver<Boolean>() {
@Override
public Boolean doCall(final Path p)
throws IOException, UnresolvedLinkException {
return dfs.recoverLease(getPathName(p));
}
@Override
public Boolean next(final FileSystem fs, final Path p)
throws IOException {
if (fs instanceof DistributedFileSystem) {
DistributedFileSystem myDfs = (DistributedFileSystem)fs;
return myDfs.recoverLease(p);
}
throw new UnsupportedOperationException("Cannot recoverLease through" +
" a symlink to a non-DistributedFileSystem: " + f + " -> " + p);
}
}.resolve(this, absF);
}
@Override
public FSDataInputStream open(Path f, final int bufferSize)
throws IOException {
statistics.incrementReadOps(1);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver<FSDataInputStream>() {
@Override
public FSDataInputStream doCall(final Path p)
throws IOException, UnresolvedLinkException {
return new HdfsDataInputStream(
dfs.open(getPathName(p), bufferSize, verifyChecksum));
}
@Override
public FSDataInputStream next(final FileSystem fs, final Path p)
throws IOException {
return fs.open(p, bufferSize);
}
}.resolve(this, absF);
}
@Override
public FSDataOutputStream append(Path f, final int bufferSize,
final Progressable progress) throws IOException {
statistics.incrementWriteOps(1);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver<FSDataOutputStream>() {
@Override
public FSDataOutputStream doCall(final Path p)
throws IOException, UnresolvedLinkException {
return dfs.append(getPathName(p), bufferSize, progress, statistics);
}
@Override
public FSDataOutputStream next(final FileSystem fs, final Path p)
throws IOException {
return fs.append(p, bufferSize);
}
}.resolve(this, absF);
}
@Override
public FSDataOutputStream create(Path f, FsPermission permission,
boolean overwrite, int bufferSize, short replication, long blockSize,
Progressable progress) throws IOException {
return this.create(f, permission,
overwrite ? EnumSet.of(CreateFlag.CREATE, CreateFlag.OVERWRITE)
: EnumSet.of(CreateFlag.CREATE), bufferSize, replication,
blockSize, progress, null);
}
/**
* Same as
* {@link #create(Path, FsPermission, boolean, int, short, long,
* Progressable)} with the addition of favoredNodes that is a hint to
* where the namenode should place the file blocks.
* The favored nodes hint is not persisted in HDFS. Hence it may be honored
* at the creation time only. HDFS could move the blocks during balancing or
* replication, to move the blocks from favored nodes. A value of null means
* no favored nodes for this create
*/
public HdfsDataOutputStream create(final Path f,
final FsPermission permission, final boolean overwrite,
final int bufferSize, final short replication, final long blockSize,
final Progressable progress, final InetSocketAddress[] favoredNodes)
throws IOException {
statistics.incrementWriteOps(1);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver<HdfsDataOutputStream>() {
@Override
public HdfsDataOutputStream doCall(final Path p)
throws IOException, UnresolvedLinkException {
final DFSOutputStream out = dfs.create(getPathName(f), permission,
overwrite ? EnumSet.of(CreateFlag.CREATE, CreateFlag.OVERWRITE)
: EnumSet.of(CreateFlag.CREATE),
true, replication, blockSize, progress, bufferSize, null,
favoredNodes);
return new HdfsDataOutputStream(out, statistics);
}
@Override
public HdfsDataOutputStream next(final FileSystem fs, final Path p)
throws IOException {
if (fs instanceof DistributedFileSystem) {
DistributedFileSystem myDfs = (DistributedFileSystem)fs;
return myDfs.create(p, permission, overwrite, bufferSize, replication,
blockSize, progress, favoredNodes);
}
throw new UnsupportedOperationException("Cannot create with" +
" favoredNodes through a symlink to a non-DistributedFileSystem: "
+ f + " -> " + p);
}
}.resolve(this, absF);
}
@Override
public FSDataOutputStream create(final Path f, final FsPermission permission,
final EnumSet<CreateFlag> cflags, final int bufferSize,
final short replication, final long blockSize, final Progressable progress,
final ChecksumOpt checksumOpt) throws IOException {
statistics.incrementWriteOps(1);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver<FSDataOutputStream>() {
@Override
public FSDataOutputStream doCall(final Path p)
throws IOException, UnresolvedLinkException {
return new HdfsDataOutputStream(dfs.create(getPathName(p), permission,
cflags, replication, blockSize, progress, bufferSize, checksumOpt),
statistics);
}
@Override
public FSDataOutputStream next(final FileSystem fs, final Path p)
throws IOException {
return fs.create(p, permission, cflags, bufferSize,
replication, blockSize, progress, checksumOpt);
}
}.resolve(this, absF);
}
@Override
protected HdfsDataOutputStream primitiveCreate(Path f,
FsPermission absolutePermission, EnumSet<CreateFlag> flag, int bufferSize,
short replication, long blockSize, Progressable progress,
ChecksumOpt checksumOpt) throws IOException {
statistics.incrementWriteOps(1);
return new HdfsDataOutputStream(dfs.primitiveCreate(
getPathName(fixRelativePart(f)),
absolutePermission, flag, true, replication, blockSize,
progress, bufferSize, checksumOpt),statistics);
}
/**
* Same as create(), except fails if parent directory doesn't already exist.
*/
@Override
@SuppressWarnings("deprecation")
public FSDataOutputStream createNonRecursive(final Path f,
final FsPermission permission, final EnumSet<CreateFlag> flag,
final int bufferSize, final short replication, final long blockSize,
final Progressable progress) throws IOException {
statistics.incrementWriteOps(1);
if (flag.contains(CreateFlag.OVERWRITE)) {
flag.add(CreateFlag.CREATE);
}
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver<FSDataOutputStream>() {
@Override
public FSDataOutputStream doCall(final Path p) throws IOException,
UnresolvedLinkException {
return new HdfsDataOutputStream(dfs.create(getPathName(p), permission,
flag, false, replication, blockSize, progress, bufferSize, null),
statistics);
}
@Override
public FSDataOutputStream next(final FileSystem fs, final Path p)
throws IOException {
return fs.createNonRecursive(p, permission, flag, bufferSize,
replication, blockSize, progress);
}
}.resolve(this, absF);
}
@Override
public boolean setReplication(Path src,
final short replication
) throws IOException {
statistics.incrementWriteOps(1);
Path absF = fixRelativePart(src);
return new FileSystemLinkResolver<Boolean>() {
@Override
public Boolean doCall(final Path p)
throws IOException, UnresolvedLinkException {
return dfs.setReplication(getPathName(p), replication);
}
@Override
public Boolean next(final FileSystem fs, final Path p)
throws IOException {
return fs.setReplication(p, replication);
}
}.resolve(this, absF);
}
/**
* Move blocks from srcs to trg and delete srcs afterwards.
* The file block sizes must be the same.
*
* @param trg existing file to append to
* @param psrcs list of files (same block size, same replication)
* @throws IOException
*/
@Override
public void concat(Path trg, Path [] psrcs) throws IOException {
statistics.incrementWriteOps(1);
// Make target absolute
Path absF = fixRelativePart(trg);
// Make all srcs absolute
Path[] srcs = new Path[psrcs.length];
for (int i=0; i<psrcs.length; i++) {
srcs[i] = fixRelativePart(psrcs[i]);
}
// Try the concat without resolving any links
String[] srcsStr = new String[psrcs.length];
try {
for (int i=0; i<psrcs.length; i++) {
srcsStr[i] = getPathName(srcs[i]);
}
dfs.concat(getPathName(trg), srcsStr);
} catch (UnresolvedLinkException e) {
// Exception could be from trg or any src.
// Fully resolve trg and srcs. Fail if any of them are a symlink.
FileStatus stat = getFileLinkStatus(absF);
if (stat.isSymlink()) {
throw new IOException("Cannot concat with a symlink target: "
+ trg + " -> " + stat.getPath());
}
absF = fixRelativePart(stat.getPath());
for (int i=0; i<psrcs.length; i++) {
stat = getFileLinkStatus(srcs[i]);
if (stat.isSymlink()) {
throw new IOException("Cannot concat with a symlink src: "
+ psrcs[i] + " -> " + stat.getPath());
}
srcs[i] = fixRelativePart(stat.getPath());
}
// Try concat again. Can still race with another symlink.
for (int i=0; i<psrcs.length; i++) {
srcsStr[i] = getPathName(srcs[i]);
}
dfs.concat(getPathName(absF), srcsStr);
}
}
@SuppressWarnings("deprecation")
@Override
public boolean rename(Path src, Path dst) throws IOException {
statistics.incrementWriteOps(1);
final Path absSrc = fixRelativePart(src);
final Path absDst = fixRelativePart(dst);
// Try the rename without resolving first
try {
return dfs.rename(getPathName(absSrc), getPathName(absDst));
} catch (UnresolvedLinkException e) {
// Fully resolve the source
final Path source = getFileLinkStatus(absSrc).getPath();
// Keep trying to resolve the destination
return new FileSystemLinkResolver<Boolean>() {
@Override
public Boolean doCall(final Path p)
throws IOException, UnresolvedLinkException {
return dfs.rename(getPathName(source), getPathName(p));
}
@Override
public Boolean next(final FileSystem fs, final Path p)
throws IOException {
// Should just throw an error in FileSystem#checkPath
return doCall(p);
}
}.resolve(this, absDst);
}
}
/**
* This rename operation is guaranteed to be atomic.
*/
@SuppressWarnings("deprecation")
@Override
public void rename(Path src, Path dst, final Options.Rename... options)
throws IOException {
statistics.incrementWriteOps(1);
final Path absSrc = fixRelativePart(src);
final Path absDst = fixRelativePart(dst);
// Try the rename without resolving first
try {
dfs.rename(getPathName(absSrc), getPathName(absDst), options);
} catch (UnresolvedLinkException e) {
// Fully resolve the source
final Path source = getFileLinkStatus(absSrc).getPath();
// Keep trying to resolve the destination
new FileSystemLinkResolver<Void>() {
@Override
public Void doCall(final Path p)
throws IOException, UnresolvedLinkException {
dfs.rename(getPathName(source), getPathName(p), options);
return null;
}
@Override
public Void next(final FileSystem fs, final Path p)
throws IOException {
// Should just throw an error in FileSystem#checkPath
return doCall(p);
}
}.resolve(this, absDst);
}
}
@Override
public boolean delete(Path f, final boolean recursive) throws IOException {
statistics.incrementWriteOps(1);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver<Boolean>() {
@Override
public Boolean doCall(final Path p)
throws IOException, UnresolvedLinkException {
return dfs.delete(getPathName(p), recursive);
}
@Override
public Boolean next(final FileSystem fs, final Path p)
throws IOException {
return fs.delete(p, recursive);
}
}.resolve(this, absF);
}
@Override
public ContentSummary getContentSummary(Path f) throws IOException {
statistics.incrementReadOps(1);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver<ContentSummary>() {
@Override
public ContentSummary doCall(final Path p)
throws IOException, UnresolvedLinkException {
return dfs.getContentSummary(getPathName(p));
}
@Override
public ContentSummary next(final FileSystem fs, final Path p)
throws IOException {
return fs.getContentSummary(p);
}
}.resolve(this, absF);
}
/** Set a directory's quotas
* @see org.apache.hadoop.hdfs.protocol.ClientProtocol#setQuota(String, long, long)
*/
public void setQuota(Path src, final long namespaceQuota,
final long diskspaceQuota) throws IOException {
Path absF = fixRelativePart(src);
new FileSystemLinkResolver<Void>() {
@Override
public Void doCall(final Path p)
throws IOException, UnresolvedLinkException {
dfs.setQuota(getPathName(p), namespaceQuota, diskspaceQuota);
return null;
}
@Override
public Void next(final FileSystem fs, final Path p)
throws IOException {
// setQuota is not defined in FileSystem, so we only can resolve
// within this DFS
return doCall(p);
}
}.resolve(this, absF);
}
private FileStatus[] listStatusInternal(Path p) throws IOException {
String src = getPathName(p);
// fetch the first batch of entries in the directory
DirectoryListing thisListing = dfs.listPaths(
src, HdfsFileStatus.EMPTY_NAME);
if (thisListing == null) { // the directory does not exist
throw new FileNotFoundException("File " + p + " does not exist.");
}
HdfsFileStatus[] partialListing = thisListing.getPartialListing();
if (!thisListing.hasMore()) { // got all entries of the directory
FileStatus[] stats = new FileStatus[partialListing.length];
for (int i = 0; i < partialListing.length; i++) {
stats[i] = partialListing[i].makeQualified(getUri(), p);
}
statistics.incrementReadOps(1);
return stats;
}
// The directory size is too big that it needs to fetch more
// estimate the total number of entries in the directory
int totalNumEntries =
partialListing.length + thisListing.getRemainingEntries();
ArrayList<FileStatus> listing =
new ArrayList<FileStatus>(totalNumEntries);
// add the first batch of entries to the array list
for (HdfsFileStatus fileStatus : partialListing) {
listing.add(fileStatus.makeQualified(getUri(), p));
}
statistics.incrementLargeReadOps(1);
// now fetch more entries
do {
thisListing = dfs.listPaths(src, thisListing.getLastName());
if (thisListing == null) { // the directory is deleted
throw new FileNotFoundException("File " + p + " does not exist.");
}
partialListing = thisListing.getPartialListing();
for (HdfsFileStatus fileStatus : partialListing) {
listing.add(fileStatus.makeQualified(getUri(), p));
}
statistics.incrementLargeReadOps(1);
} while (thisListing.hasMore());
return listing.toArray(new FileStatus[listing.size()]);
}
/**
* List all the entries of a directory
*
* Note that this operation is not atomic for a large directory.
* The entries of a directory may be fetched from NameNode multiple times.
* It only guarantees that each name occurs once if a directory
* undergoes changes between the calls.
*/
@Override
public FileStatus[] listStatus(Path p) throws IOException {
Path absF = fixRelativePart(p);
return new FileSystemLinkResolver<FileStatus[]>() {
@Override
public FileStatus[] doCall(final Path p)
throws IOException, UnresolvedLinkException {
return listStatusInternal(p);
}
@Override
public FileStatus[] next(final FileSystem fs, final Path p)
throws IOException {
return fs.listStatus(p);
}
}.resolve(this, absF);
}
@Override
protected RemoteIterator<LocatedFileStatus> listLocatedStatus(final Path p,
final PathFilter filter)
throws IOException {
final Path absF = fixRelativePart(p);
return new RemoteIterator<LocatedFileStatus>() {
private DirectoryListing thisListing;
private int i;
private String src;
private LocatedFileStatus curStat = null;
{ // initializer
// Fully resolve symlinks in path first to avoid additional resolution
// round-trips as we fetch more batches of listings
src = getPathName(resolvePath(absF));
// fetch the first batch of entries in the directory
thisListing = dfs.listPaths(src, HdfsFileStatus.EMPTY_NAME, true);
statistics.incrementReadOps(1);
if (thisListing == null) { // the directory does not exist
throw new FileNotFoundException("File " + p + " does not exist.");
}
}
@Override
public boolean hasNext() throws IOException {
while (curStat == null && hasNextNoFilter()) {
LocatedFileStatus next =
((HdfsLocatedFileStatus)thisListing.getPartialListing()[i++])
.makeQualifiedLocated(getUri(), absF);
if (filter.accept(next.getPath())) {
curStat = next;
}
}
return curStat != null;
}
/** Check if there is a next item before applying the given filter */
private boolean hasNextNoFilter() throws IOException {
if (thisListing == null) {
return false;
}
if (i>=thisListing.getPartialListing().length
&& thisListing.hasMore()) {
// current listing is exhausted & fetch a new listing
thisListing = dfs.listPaths(src, thisListing.getLastName(), true);
statistics.incrementReadOps(1);
if (thisListing == null) {
return false;
}
i = 0;
}
return (i<thisListing.getPartialListing().length);
}
@Override
public LocatedFileStatus next() throws IOException {
if (hasNext()) {
LocatedFileStatus tmp = curStat;
curStat = null;
return tmp;
}
throw new java.util.NoSuchElementException("No more entry in " + p);
}
};
}
/**
* Create a directory, only when the parent directories exist.
*
* See {@link FsPermission#applyUMask(FsPermission)} for details of how
* the permission is applied.
*
* @param f The path to create
* @param permission The permission. See FsPermission#applyUMask for
* details about how this is used to calculate the
* effective permission.
*/
public boolean mkdir(Path f, FsPermission permission) throws IOException {
return mkdirsInternal(f, permission, false);
}
/**
* Create a directory and its parent directories.
*
* See {@link FsPermission#applyUMask(FsPermission)} for details of how
* the permission is applied.
*
* @param f The path to create
* @param permission The permission. See FsPermission#applyUMask for
* details about how this is used to calculate the
* effective permission.
*/
@Override
public boolean mkdirs(Path f, FsPermission permission) throws IOException {
return mkdirsInternal(f, permission, true);
}
private boolean mkdirsInternal(Path f, final FsPermission permission,
final boolean createParent) throws IOException {
statistics.incrementWriteOps(1);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver<Boolean>() {
@Override
public Boolean doCall(final Path p)
throws IOException, UnresolvedLinkException {
return dfs.mkdirs(getPathName(p), permission, createParent);
}
@Override
public Boolean next(final FileSystem fs, final Path p)
throws IOException {
// FileSystem doesn't have a non-recursive mkdir() method
// Best we can do is error out
if (!createParent) {
throw new IOException("FileSystem does not support non-recursive"
+ "mkdir");
}
return fs.mkdirs(p, permission);
}
}.resolve(this, absF);
}
@SuppressWarnings("deprecation")
@Override
protected boolean primitiveMkdir(Path f, FsPermission absolutePermission)
throws IOException {
statistics.incrementWriteOps(1);
return dfs.primitiveMkdir(getPathName(f), absolutePermission);
}
@Override
public void close() throws IOException {
try {
super.processDeleteOnExit();
dfs.close();
} finally {
super.close();
}
}
@Override
public String toString() {
return "DFS[" + dfs + "]";
}
@InterfaceAudience.Private
@VisibleForTesting
public DFSClient getClient() {
return dfs;
}
/** @deprecated Use {@link org.apache.hadoop.fs.FsStatus} instead */
@InterfaceAudience.Private
@Deprecated
public static class DiskStatus extends FsStatus {
public DiskStatus(FsStatus stats) {
super(stats.getCapacity(), stats.getUsed(), stats.getRemaining());
}
public DiskStatus(long capacity, long dfsUsed, long remaining) {
super(capacity, dfsUsed, remaining);
}
public long getDfsUsed() {
return super.getUsed();
}
}
@Override
public FsStatus getStatus(Path p) throws IOException {
statistics.incrementReadOps(1);
return dfs.getDiskStatus();
}
/** Return the disk usage of the filesystem, including total capacity,
* used space, and remaining space
* @deprecated Use {@link org.apache.hadoop.fs.FileSystem#getStatus()}
* instead */
@Deprecated
public DiskStatus getDiskStatus() throws IOException {
return new DiskStatus(dfs.getDiskStatus());
}
/** Return the total raw capacity of the filesystem, disregarding
* replication.
* @deprecated Use {@link org.apache.hadoop.fs.FileSystem#getStatus()}
* instead */
@Deprecated
public long getRawCapacity() throws IOException{
return dfs.getDiskStatus().getCapacity();
}
/** Return the total raw used space in the filesystem, disregarding
* replication.
* @deprecated Use {@link org.apache.hadoop.fs.FileSystem#getStatus()}
* instead */
@Deprecated
public long getRawUsed() throws IOException{
return dfs.getDiskStatus().getUsed();
}
/**
* Returns count of blocks with no good replicas left. Normally should be
* zero.
*
* @throws IOException
*/
public long getMissingBlocksCount() throws IOException {
return dfs.getMissingBlocksCount();
}
/**
* Returns count of blocks with one of more replica missing.
*
* @throws IOException
*/
public long getUnderReplicatedBlocksCount() throws IOException {
return dfs.getUnderReplicatedBlocksCount();
}
/**
* Returns count of blocks with at least one replica marked corrupt.
*
* @throws IOException
*/
public long getCorruptBlocksCount() throws IOException {
return dfs.getCorruptBlocksCount();
}
@Override
public RemoteIterator<Path> listCorruptFileBlocks(Path path)
throws IOException {
return new CorruptFileBlockIterator(dfs, path);
}
/** @return datanode statistics. */
public DatanodeInfo[] getDataNodeStats() throws IOException {
return getDataNodeStats(DatanodeReportType.ALL);
}
/** @return datanode statistics for the given type. */
public DatanodeInfo[] getDataNodeStats(final DatanodeReportType type
) throws IOException {
return dfs.datanodeReport(type);
}
/**
* Enter, leave or get safe mode.
*
* @see org.apache.hadoop.hdfs.protocol.ClientProtocol#setSafeMode(
* HdfsConstants.SafeModeAction,boolean)
*/
public boolean setSafeMode(HdfsConstants.SafeModeAction action)
throws IOException {
return setSafeMode(action, false);
}
/**
* Enter, leave or get safe mode.
*
* @param action
* One of SafeModeAction.ENTER, SafeModeAction.LEAVE and
* SafeModeAction.GET
* @param isChecked
* If true check only for Active NNs status, else check first NN's
* status
* @see org.apache.hadoop.hdfs.protocol.ClientProtocol#setSafeMode(SafeModeAction, boolean)
*/
public boolean setSafeMode(HdfsConstants.SafeModeAction action,
boolean isChecked) throws IOException {
return dfs.setSafeMode(action, isChecked);
}
/**
* Save namespace image.
*
* @see org.apache.hadoop.hdfs.protocol.ClientProtocol#saveNamespace()
*/
public void saveNamespace() throws AccessControlException, IOException {
dfs.saveNamespace();
}
/**
* Rolls the edit log on the active NameNode.
* Requires super-user privileges.
* @see org.apache.hadoop.hdfs.protocol.ClientProtocol#rollEdits()
* @return the transaction ID of the newly created segment
*/
public long rollEdits() throws AccessControlException, IOException {
return dfs.rollEdits();
}
/**
* enable/disable/check restoreFaileStorage
*
* @see org.apache.hadoop.hdfs.protocol.ClientProtocol#restoreFailedStorage(String arg)
*/
public boolean restoreFailedStorage(String arg)
throws AccessControlException, IOException {
return dfs.restoreFailedStorage(arg);
}
/**
* Refreshes the list of hosts and excluded hosts from the configured
* files.
*/
public void refreshNodes() throws IOException {
dfs.refreshNodes();
}
/**
* Finalize previously upgraded files system state.
* @throws IOException
*/
public void finalizeUpgrade() throws IOException {
dfs.finalizeUpgrade();
}
/*
* Requests the namenode to dump data strcutures into specified
* file.
*/
public void metaSave(String pathname) throws IOException {
dfs.metaSave(pathname);
}
@Override
public FsServerDefaults getServerDefaults() throws IOException {
return dfs.getServerDefaults();
}
/**
* We need to find the blocks that didn't match. Likely only one
* is corrupt but we will report both to the namenode. In the future,
* we can consider figuring out exactly which block is corrupt.
*/
// We do not see a need for user to report block checksum errors and do not
// want to rely on user to report block corruptions.
@Deprecated
public boolean reportChecksumFailure(Path f,
FSDataInputStream in, long inPos,
FSDataInputStream sums, long sumsPos) {
if(!(in instanceof HdfsDataInputStream && sums instanceof HdfsDataInputStream))
throw new IllegalArgumentException(
"Input streams must be types of HdfsDataInputStream");
LocatedBlock lblocks[] = new LocatedBlock[2];
// Find block in data stream.
HdfsDataInputStream dfsIn = (HdfsDataInputStream) in;
ExtendedBlock dataBlock = dfsIn.getCurrentBlock();
if (dataBlock == null) {
LOG.error("Error: Current block in data stream is null! ");
return false;
}
DatanodeInfo[] dataNode = {dfsIn.getCurrentDatanode()};
lblocks[0] = new LocatedBlock(dataBlock, dataNode);
LOG.info("Found checksum error in data stream at "
+ dataBlock + " on datanode="
+ dataNode[0]);
// Find block in checksum stream
HdfsDataInputStream dfsSums = (HdfsDataInputStream) sums;
ExtendedBlock sumsBlock = dfsSums.getCurrentBlock();
if (sumsBlock == null) {
LOG.error("Error: Current block in checksum stream is null! ");
return false;
}
DatanodeInfo[] sumsNode = {dfsSums.getCurrentDatanode()};
lblocks[1] = new LocatedBlock(sumsBlock, sumsNode);
LOG.info("Found checksum error in checksum stream at "
+ sumsBlock + " on datanode=" + sumsNode[0]);
// Ask client to delete blocks.
dfs.reportChecksumFailure(f.toString(), lblocks);
return true;
}
/**
* Returns the stat information about the file.
* @throws FileNotFoundException if the file does not exist.
*/
@Override
public FileStatus getFileStatus(Path f) throws IOException {
statistics.incrementReadOps(1);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver<FileStatus>() {
@Override
public FileStatus doCall(final Path p) throws IOException,
UnresolvedLinkException {
HdfsFileStatus fi = dfs.getFileInfo(getPathName(p));
if (fi != null) {
return fi.makeQualified(getUri(), p);
} else {
throw new FileNotFoundException("File does not exist: " + p);
}
}
@Override
public FileStatus next(final FileSystem fs, final Path p)
throws IOException {
return fs.getFileStatus(p);
}
}.resolve(this, absF);
}
@SuppressWarnings("deprecation")
@Override
public void createSymlink(final Path target, final Path link,
final boolean createParent) throws AccessControlException,
FileAlreadyExistsException, FileNotFoundException,
ParentNotDirectoryException, UnsupportedFileSystemException,
IOException {
if (!FileSystem.isSymlinksEnabled()) {
throw new UnsupportedOperationException("Symlinks not supported");
}
statistics.incrementWriteOps(1);
final Path absF = fixRelativePart(link);
new FileSystemLinkResolver<Void>() {
@Override
public Void doCall(final Path p) throws IOException,
UnresolvedLinkException {
dfs.createSymlink(target.toString(), getPathName(p), createParent);
return null;
}
@Override
public Void next(final FileSystem fs, final Path p)
throws IOException, UnresolvedLinkException {
fs.createSymlink(target, p, createParent);
return null;
}
}.resolve(this, absF);
}
@Override
public boolean supportsSymlinks() {
return true;
}
@Override
public FileStatus getFileLinkStatus(final Path f)
throws AccessControlException, FileNotFoundException,
UnsupportedFileSystemException, IOException {
statistics.incrementReadOps(1);
final Path absF = fixRelativePart(f);
FileStatus status = new FileSystemLinkResolver<FileStatus>() {
@Override
public FileStatus doCall(final Path p) throws IOException,
UnresolvedLinkException {
HdfsFileStatus fi = dfs.getFileLinkInfo(getPathName(p));
if (fi != null) {
return fi.makeQualified(getUri(), p);
} else {
throw new FileNotFoundException("File does not exist: " + p);
}
}
@Override
public FileStatus next(final FileSystem fs, final Path p)
throws IOException, UnresolvedLinkException {
return fs.getFileLinkStatus(p);
}
}.resolve(this, absF);
// Fully-qualify the symlink
if (status.isSymlink()) {
Path targetQual = FSLinkResolver.qualifySymlinkTarget(this.getUri(),
status.getPath(), status.getSymlink());
status.setSymlink(targetQual);
}
return status;
}
@Override
public Path getLinkTarget(final Path f) throws AccessControlException,
FileNotFoundException, UnsupportedFileSystemException, IOException {
statistics.incrementReadOps(1);
final Path absF = fixRelativePart(f);
return new FileSystemLinkResolver<Path>() {
@Override
public Path doCall(final Path p) throws IOException,
UnresolvedLinkException {
HdfsFileStatus fi = dfs.getFileLinkInfo(getPathName(p));
if (fi != null) {
return fi.makeQualified(getUri(), p).getSymlink();
} else {
throw new FileNotFoundException("File does not exist: " + p);
}
}
@Override
public Path next(final FileSystem fs, final Path p)
throws IOException, UnresolvedLinkException {
return fs.getLinkTarget(p);
}
}.resolve(this, absF);
}
@Override
protected Path resolveLink(Path f) throws IOException {
statistics.incrementReadOps(1);
String target = dfs.getLinkTarget(getPathName(fixRelativePart(f)));
if (target == null) {
throw new FileNotFoundException("File does not exist: " + f.toString());
}
return new Path(target);
}
@Override
public FileChecksum getFileChecksum(Path f) throws IOException {
statistics.incrementReadOps(1);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver<FileChecksum>() {
@Override
public FileChecksum doCall(final Path p)
throws IOException, UnresolvedLinkException {
return dfs.getFileChecksum(getPathName(p));
}
@Override
public FileChecksum next(final FileSystem fs, final Path p)
throws IOException {
return fs.getFileChecksum(p);
}
}.resolve(this, absF);
}
@Override
public void setPermission(Path p, final FsPermission permission
) throws IOException {
statistics.incrementWriteOps(1);
Path absF = fixRelativePart(p);
new FileSystemLinkResolver<Void>() {
@Override
public Void doCall(final Path p)
throws IOException, UnresolvedLinkException {
dfs.setPermission(getPathName(p), permission);
return null;
}
@Override
public Void next(final FileSystem fs, final Path p)
throws IOException {
fs.setPermission(p, permission);
return null;
}
}.resolve(this, absF);
}
@Override
public void setOwner(Path p, final String username, final String groupname
) throws IOException {
if (username == null && groupname == null) {
throw new IOException("username == null && groupname == null");
}
statistics.incrementWriteOps(1);
Path absF = fixRelativePart(p);
new FileSystemLinkResolver<Void>() {
@Override
public Void doCall(final Path p)
throws IOException, UnresolvedLinkException {
dfs.setOwner(getPathName(p), username, groupname);
return null;
}
@Override
public Void next(final FileSystem fs, final Path p)
throws IOException {
fs.setOwner(p, username, groupname);
return null;
}
}.resolve(this, absF);
}
@Override
public void setTimes(Path p, final long mtime, final long atime
) throws IOException {
statistics.incrementWriteOps(1);
Path absF = fixRelativePart(p);
new FileSystemLinkResolver<Void>() {
@Override
public Void doCall(final Path p)
throws IOException, UnresolvedLinkException {
dfs.setTimes(getPathName(p), mtime, atime);
return null;
}
@Override
public Void next(final FileSystem fs, final Path p)
throws IOException {
fs.setTimes(p, mtime, atime);
return null;
}
}.resolve(this, absF);
}
@Override
protected int getDefaultPort() {
return NameNode.DEFAULT_PORT;
}
@Override
public
Token<DelegationTokenIdentifier> getDelegationToken(String renewer
) throws IOException {
Token<DelegationTokenIdentifier> result =
dfs.getDelegationToken(renewer == null ? null : new Text(renewer));
return result;
}
/*
* Delegation Token Operations
* These are DFS only operations.
*/
/**
* Get a valid Delegation Token.
*
* @param renewer Name of the designated renewer for the token
* @return Token<DelegationTokenIdentifier>
* @throws IOException
* @deprecated use {@link #getDelegationToken(String)}
*/
@Deprecated
public Token<DelegationTokenIdentifier> getDelegationToken(Text renewer)
throws IOException {
return getDelegationToken(renewer.toString());
}
/**
* Renew an existing delegation token.
*
* @param token delegation token obtained earlier
* @return the new expiration time
* @throws IOException
* @deprecated Use Token.renew instead.
*/
public long renewDelegationToken(Token<DelegationTokenIdentifier> token)
throws InvalidToken, IOException {
try {
return token.renew(getConf());
} catch (InterruptedException ie) {
throw new RuntimeException("Caught interrupted", ie);
}
}
/**
* Cancel an existing delegation token.
*
* @param token delegation token
* @throws IOException
* @deprecated Use Token.cancel instead.
*/
public void cancelDelegationToken(Token<DelegationTokenIdentifier> token)
throws IOException {
try {
token.cancel(getConf());
} catch (InterruptedException ie) {
throw new RuntimeException("Caught interrupted", ie);
}
}
/**
* Requests the namenode to tell all datanodes to use a new, non-persistent
* bandwidth value for dfs.balance.bandwidthPerSec.
* The bandwidth parameter is the max number of bytes per second of network
* bandwidth to be used by a datanode during balancing.
*
* @param bandwidth Balancer bandwidth in bytes per second for all datanodes.
* @throws IOException
*/
public void setBalancerBandwidth(long bandwidth) throws IOException {
dfs.setBalancerBandwidth(bandwidth);
}
/**
* Get a canonical service name for this file system. If the URI is logical,
* the hostname part of the URI will be returned.
* @return a service string that uniquely identifies this file system.
*/
@Override
public String getCanonicalServiceName() {
return dfs.getCanonicalServiceName();
}
@Override
protected URI canonicalizeUri(URI uri) {
if (HAUtil.isLogicalUri(getConf(), uri)) {
// Don't try to DNS-resolve logical URIs, since the 'authority'
// portion isn't a proper hostname
return uri;
} else {
return NetUtils.getCanonicalUri(uri, getDefaultPort());
}
}
/**
* Utility function that returns if the NameNode is in safemode or not. In HA
* mode, this API will return only ActiveNN's safemode status.
*
* @return true if NameNode is in safemode, false otherwise.
* @throws IOException
* when there is an issue communicating with the NameNode
*/
public boolean isInSafeMode() throws IOException {
return setSafeMode(SafeModeAction.SAFEMODE_GET, true);
}
/** @see HdfsAdmin#allowSnapshot(Path) */
public void allowSnapshot(final Path path) throws IOException {
Path absF = fixRelativePart(path);
new FileSystemLinkResolver<Void>() {
@Override
public Void doCall(final Path p)
throws IOException, UnresolvedLinkException {
dfs.allowSnapshot(getPathName(p));
return null;
}
@Override
public Void next(final FileSystem fs, final Path p)
throws IOException {
if (fs instanceof DistributedFileSystem) {
DistributedFileSystem myDfs = (DistributedFileSystem)fs;
myDfs.allowSnapshot(p);
} else {
throw new UnsupportedOperationException("Cannot perform snapshot"
+ " operations on a symlink to a non-DistributedFileSystem: "
+ path + " -> " + p);
}
return null;
}
}.resolve(this, absF);
}
/** @see HdfsAdmin#disallowSnapshot(Path) */
public void disallowSnapshot(final Path path) throws IOException {
Path absF = fixRelativePart(path);
new FileSystemLinkResolver<Void>() {
@Override
public Void doCall(final Path p)
throws IOException, UnresolvedLinkException {
dfs.disallowSnapshot(getPathName(p));
return null;
}
@Override
public Void next(final FileSystem fs, final Path p)
throws IOException {
if (fs instanceof DistributedFileSystem) {
DistributedFileSystem myDfs = (DistributedFileSystem)fs;
myDfs.disallowSnapshot(p);
} else {
throw new UnsupportedOperationException("Cannot perform snapshot"
+ " operations on a symlink to a non-DistributedFileSystem: "
+ path + " -> " + p);
}
return null;
}
}.resolve(this, absF);
}
@Override
public Path createSnapshot(final Path path, final String snapshotName)
throws IOException {
Path absF = fixRelativePart(path);
return new FileSystemLinkResolver<Path>() {
@Override
public Path doCall(final Path p)
throws IOException, UnresolvedLinkException {
return new Path(dfs.createSnapshot(getPathName(p), snapshotName));
}
@Override
public Path next(final FileSystem fs, final Path p)
throws IOException {
if (fs instanceof DistributedFileSystem) {
DistributedFileSystem myDfs = (DistributedFileSystem)fs;
return myDfs.createSnapshot(p);
} else {
throw new UnsupportedOperationException("Cannot perform snapshot"
+ " operations on a symlink to a non-DistributedFileSystem: "
+ path + " -> " + p);
}
}
}.resolve(this, absF);
}
@Override
public void renameSnapshot(final Path path, final String snapshotOldName,
final String snapshotNewName) throws IOException {
Path absF = fixRelativePart(path);
new FileSystemLinkResolver<Void>() {
@Override
public Void doCall(final Path p)
throws IOException, UnresolvedLinkException {
dfs.renameSnapshot(getPathName(p), snapshotOldName, snapshotNewName);
return null;
}
@Override
public Void next(final FileSystem fs, final Path p)
throws IOException {
if (fs instanceof DistributedFileSystem) {
DistributedFileSystem myDfs = (DistributedFileSystem)fs;
myDfs.renameSnapshot(p, snapshotOldName, snapshotNewName);
} else {
throw new UnsupportedOperationException("Cannot perform snapshot"
+ " operations on a symlink to a non-DistributedFileSystem: "
+ path + " -> " + p);
}
return null;
}
}.resolve(this, absF);
}
/**
* @return All the snapshottable directories
* @throws IOException
*/
public SnapshottableDirectoryStatus[] getSnapshottableDirListing()
throws IOException {
return dfs.getSnapshottableDirListing();
}
@Override
public void deleteSnapshot(final Path snapshotDir, final String snapshotName)
throws IOException {
Path absF = fixRelativePart(snapshotDir);
new FileSystemLinkResolver<Void>() {
@Override
public Void doCall(final Path p)
throws IOException, UnresolvedLinkException {
dfs.deleteSnapshot(getPathName(p), snapshotName);
return null;
}
@Override
public Void next(final FileSystem fs, final Path p)
throws IOException {
if (fs instanceof DistributedFileSystem) {
DistributedFileSystem myDfs = (DistributedFileSystem)fs;
myDfs.deleteSnapshot(p, snapshotName);
} else {
throw new UnsupportedOperationException("Cannot perform snapshot"
+ " operations on a symlink to a non-DistributedFileSystem: "
+ snapshotDir + " -> " + p);
}
return null;
}
}.resolve(this, absF);
}
/**
* Get the difference between two snapshots, or between a snapshot and the
* current tree of a directory.
*
* @see DFSClient#getSnapshotDiffReport(Path, String, String)
*/
public SnapshotDiffReport getSnapshotDiffReport(final Path snapshotDir,
final String fromSnapshot, final String toSnapshot) throws IOException {
Path absF = fixRelativePart(snapshotDir);
return new FileSystemLinkResolver<SnapshotDiffReport>() {
@Override
public SnapshotDiffReport doCall(final Path p)
throws IOException, UnresolvedLinkException {
return dfs.getSnapshotDiffReport(getPathName(p), fromSnapshot,
toSnapshot);
}
@Override
public SnapshotDiffReport next(final FileSystem fs, final Path p)
throws IOException {
if (fs instanceof DistributedFileSystem) {
DistributedFileSystem myDfs = (DistributedFileSystem)fs;
myDfs.getSnapshotDiffReport(p, fromSnapshot, toSnapshot);
} else {
throw new UnsupportedOperationException("Cannot perform snapshot"
+ " operations on a symlink to a non-DistributedFileSystem: "
+ snapshotDir + " -> " + p);
}
return null;
}
}.resolve(this, absF);
}
/**
* Get the close status of a file
* @param src The path to the file
*
* @return return true if file is closed
* @throws FileNotFoundException if the file does not exist.
* @throws IOException If an I/O error occurred
*/
public boolean isFileClosed(final Path src) throws IOException {
Path absF = fixRelativePart(src);
return new FileSystemLinkResolver<Boolean>() {
@Override
public Boolean doCall(final Path p)
throws IOException, UnresolvedLinkException {
return dfs.isFileClosed(getPathName(p));
}
@Override
public Boolean next(final FileSystem fs, final Path p)
throws IOException {
if (fs instanceof DistributedFileSystem) {
DistributedFileSystem myDfs = (DistributedFileSystem)fs;
return myDfs.isFileClosed(p);
} else {
throw new UnsupportedOperationException("Cannot call isFileClosed"
+ " on a symlink to a non-DistributedFileSystem: "
+ src + " -> " + p);
}
}
}.resolve(this, absF);
}
}