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/**
* 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 com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import org.apache.commons.collections.list.TreeList;
import org.apache.hadoop.HadoopIllegalArgumentException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.crypto.key.KeyProvider;
import org.apache.hadoop.crypto.key.KeyProviderTokenIssuer;
import org.apache.hadoop.fs.BlockLocation;
import org.apache.hadoop.fs.BlockStoragePolicySpi;
import org.apache.hadoop.fs.CacheFlag;
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.FSDataOutputStreamBuilder;
import org.apache.hadoop.fs.FSLinkResolver;
import org.apache.hadoop.fs.FileAlreadyExistsException;
import org.apache.hadoop.fs.FileChecksum;
import org.apache.hadoop.fs.FileEncryptionInfo;
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.GlobalStorageStatistics;
import org.apache.hadoop.fs.GlobalStorageStatistics.StorageStatisticsProvider;
import org.apache.hadoop.fs.InvalidPathHandleException;
import org.apache.hadoop.fs.PathHandle;
import org.apache.hadoop.fs.LocatedFileStatus;
import org.apache.hadoop.fs.Options;
import org.apache.hadoop.fs.Options.ChecksumOpt;
import org.apache.hadoop.fs.Options.HandleOpt;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathFilter;
import org.apache.hadoop.fs.QuotaUsage;
import org.apache.hadoop.fs.RemoteIterator;
import org.apache.hadoop.fs.StorageStatistics;
import org.apache.hadoop.fs.StorageType;
import org.apache.hadoop.fs.UnresolvedLinkException;
import org.apache.hadoop.fs.UnsupportedFileSystemException;
import org.apache.hadoop.fs.XAttrSetFlag;
import org.apache.hadoop.fs.permission.AclEntry;
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.hdfs.DFSOpsCountStatistics.OpType;
import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
import org.apache.hadoop.hdfs.client.HdfsDataOutputStream;
import org.apache.hadoop.hdfs.client.impl.CorruptFileBlockIterator;
import org.apache.hadoop.hdfs.protocol.AddErasureCodingPolicyResponse;
import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
import org.apache.hadoop.hdfs.protocol.CacheDirectiveInfo;
import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
import org.apache.hadoop.hdfs.protocol.CachePoolInfo;
import org.apache.hadoop.hdfs.protocol.ClientProtocol;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.protocol.DirectoryListing;
import org.apache.hadoop.hdfs.protocol.EncryptionZone;
import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicyInfo;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.DatanodeReportType;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.ReencryptAction;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.RollingUpgradeAction;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.SafeModeAction;
import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
import org.apache.hadoop.hdfs.protocol.HdfsPathHandle;
import org.apache.hadoop.hdfs.protocol.HdfsLocatedFileStatus;
import org.apache.hadoop.hdfs.protocol.OpenFileEntry;
import org.apache.hadoop.hdfs.protocol.OpenFilesIterator.OpenFilesType;
import org.apache.hadoop.hdfs.protocol.ZoneReencryptionStatus;
import org.apache.hadoop.hdfs.protocol.RollingUpgradeInfo;
import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport;
import org.apache.hadoop.hdfs.protocol.SnapshotDiffReportListing;
import org.apache.hadoop.hdfs.protocol.SnapshotDiffReportListing.DiffReportListingEntry;
import org.apache.hadoop.hdfs.client.impl.SnapshotDiffReportGenerator;
import org.apache.hadoop.hdfs.protocol.SnapshottableDirectoryStatus;
import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.security.token.DelegationTokenIssuer;
import org.apache.hadoop.util.ChunkedArrayList;
import org.apache.hadoop.util.Progressable;
import javax.annotation.Nonnull;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.URI;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.EnumSet;
import java.util.List;
import java.util.Map;
import java.util.Optional;
/****************************************************************
* 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
implements KeyProviderTokenIssuer {
private Path workingDir;
private URI uri;
private String homeDirPrefix =
HdfsClientConfigKeys.DFS_USER_HOME_DIR_PREFIX_DEFAULT;
DFSClient dfs;
private boolean verifyChecksum = true;
private DFSOpsCountStatistics storageStatistics;
static{
HdfsConfiguration.init();
}
public DistributedFileSystem() {
}
/**
* Return the protocol scheme for the FileSystem.
*
*
* @return hdfs
*/
@Override
public String getScheme() {
return HdfsConstants.HDFS_URI_SCHEME;
}
@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);
}
homeDirPrefix = conf.get(
HdfsClientConfigKeys.DFS_USER_HOME_DIR_PREFIX_KEY,
HdfsClientConfigKeys.DFS_USER_HOME_DIR_PREFIX_DEFAULT);
this.dfs = new DFSClient(uri, conf, statistics);
this.uri = URI.create(uri.getScheme()+"://"+uri.getAuthority());
this.workingDir = getHomeDirectory();
storageStatistics = (DFSOpsCountStatistics) GlobalStorageStatistics.INSTANCE
.put(DFSOpsCountStatistics.NAME,
new StorageStatisticsProvider() {
@Override
public StorageStatistics provide() {
return new DFSOpsCountStatistics();
}
});
}
@Override
public Path getWorkingDirectory() {
return workingDir;
}
@Override
public long getDefaultBlockSize() {
return dfs.getConf().getDefaultBlockSize();
}
@Override
public short getDefaultReplication() {
return dfs.getConf().getDefaultReplication();
}
@Override
public void setWorkingDirectory(Path dir) {
String result = fixRelativePart(dir).toUri().getPath();
if (!DFSUtilClient.isValidName(result)) {
throw new IllegalArgumentException("Invalid DFS directory name " +
result);
}
workingDir = fixRelativePart(dir);
}
@Override
public Path getHomeDirectory() {
return makeQualified(new Path(homeDirPrefix + "/"
+ dfs.ugi.getShortUserName()));
}
/**
* Returns the hedged read metrics object for this client.
*
* @return object of DFSHedgedReadMetrics
*/
public DFSHedgedReadMetrics getHedgedReadMetrics() {
return dfs.getHedgedReadMetrics();
}
/**
* 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
*/
String getPathName(Path file) {
checkPath(file);
String result = file.toUri().getPath();
if (!DFSUtilClient.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);
}
/**
* The returned BlockLocation will have different formats for replicated
* and erasure coded file.
* Please refer to
* {@link FileSystem#getFileBlockLocations(FileStatus, long, long)}
* for more details.
*/
@Override
public BlockLocation[] getFileBlockLocations(Path p,
final long start, final long len) throws IOException {
statistics.incrementReadOps(1);
storageStatistics.incrementOpCounter(OpType.GET_FILE_BLOCK_LOCATIONS);
final Path absF = fixRelativePart(p);
return new FileSystemLinkResolver() {
@Override
public BlockLocation[] doCall(final Path p) throws IOException {
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);
}
@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() {
@Override
public Boolean doCall(final Path p) throws IOException{
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);
storageStatistics.incrementOpCounter(OpType.OPEN);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver() {
@Override
public FSDataInputStream doCall(final Path p) throws IOException {
final DFSInputStream dfsis =
dfs.open(getPathName(p), bufferSize, verifyChecksum);
return dfs.createWrappedInputStream(dfsis);
}
@Override
public FSDataInputStream next(final FileSystem fs, final Path p)
throws IOException {
return fs.open(p, bufferSize);
}
}.resolve(this, absF);
}
/**
* Opens an FSDataInputStream with the indicated file ID extracted from
* the {@link PathHandle}.
* @param fd Reference to entity in this FileSystem.
* @param bufferSize the size of the buffer to be used.
* @throws InvalidPathHandleException If PathHandle constraints do not hold
* @throws IOException On I/O errors
*/
@Override
public FSDataInputStream open(PathHandle fd, int bufferSize)
throws IOException {
statistics.incrementReadOps(1);
storageStatistics.incrementOpCounter(OpType.OPEN);
if (!(fd instanceof HdfsPathHandle)) {
fd = new HdfsPathHandle(fd.bytes());
}
HdfsPathHandle id = (HdfsPathHandle) fd;
final DFSInputStream dfsis = dfs.open(id, bufferSize, verifyChecksum);
return dfs.createWrappedInputStream(dfsis);
}
/**
* Create a handle to an HDFS file.
* @param st HdfsFileStatus instance from NameNode
* @param opts Standard handle arguments
* @throws IllegalArgumentException If the FileStatus instance refers to a
* directory, symlink, or another namesystem.
* @throws UnsupportedOperationException If opts are not specified or both
* data and location are not allowed to change.
* @return A handle to the file.
*/
@Override
protected HdfsPathHandle createPathHandle(FileStatus st, HandleOpt... opts) {
if (!(st instanceof HdfsFileStatus)) {
throw new IllegalArgumentException("Invalid FileStatus "
+ st.getClass().getSimpleName());
}
if (st.isDirectory() || st.isSymlink()) {
throw new IllegalArgumentException("PathHandle only available for files");
}
if (!getUri().getAuthority().equals(st.getPath().toUri().getAuthority())) {
throw new IllegalArgumentException("Wrong FileSystem: " + st.getPath());
}
HandleOpt.Data data = HandleOpt.getOpt(HandleOpt.Data.class, opts)
.orElse(HandleOpt.changed(false));
HandleOpt.Location loc = HandleOpt.getOpt(HandleOpt.Location.class, opts)
.orElse(HandleOpt.moved(false));
HdfsFileStatus hst = (HdfsFileStatus) st;
final Path p;
final Optional inodeId;
if (loc.allowChange()) {
p = DFSUtilClient.makePathFromFileId(hst.getFileId());
inodeId = Optional.empty();
} else {
p = hst.getPath();
inodeId = Optional.of(hst.getFileId());
}
final Optional mtime = !data.allowChange()
? Optional.of(hst.getModificationTime())
: Optional.empty();
return new HdfsPathHandle(getPathName(p), inodeId, mtime);
}
@Override
public FSDataOutputStream append(Path f, final int bufferSize,
final Progressable progress) throws IOException {
return append(f, EnumSet.of(CreateFlag.APPEND), bufferSize, progress);
}
/**
* Append to an existing file (optional operation).
*
* @param f the existing file to be appended.
* @param flag Flags for the Append operation. CreateFlag.APPEND is mandatory
* to be present.
* @param bufferSize the size of the buffer to be used.
* @param progress for reporting progress if it is not null.
* @return Returns instance of {@link FSDataOutputStream}
* @throws IOException
*/
public FSDataOutputStream append(Path f, final EnumSet flag,
final int bufferSize, final Progressable progress) throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.APPEND);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver() {
@Override
public FSDataOutputStream doCall(final Path p)
throws IOException {
return dfs.append(getPathName(p), bufferSize, flag, progress,
statistics);
}
@Override
public FSDataOutputStream next(final FileSystem fs, final Path p)
throws IOException {
return fs.append(p, bufferSize);
}
}.resolve(this, absF);
}
/**
* Append to an existing file (optional operation).
*
* @param f the existing file to be appended.
* @param flag Flags for the Append operation. CreateFlag.APPEND is mandatory
* to be present.
* @param bufferSize the size of the buffer to be used.
* @param progress for reporting progress if it is not null.
* @param favoredNodes Favored nodes for new blocks
* @return Returns instance of {@link FSDataOutputStream}
* @throws IOException
*/
public FSDataOutputStream append(Path f, final EnumSet flag,
final int bufferSize, final Progressable progress,
final InetSocketAddress[] favoredNodes) throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.APPEND);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver() {
@Override
public FSDataOutputStream doCall(final Path p)
throws IOException {
return dfs.append(getPathName(p), bufferSize, flag, progress,
statistics, favoredNodes);
}
@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. And with favored nodes, blocks will be pinned
* on the datanodes to prevent balancing move the block. HDFS could move the
* blocks during 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);
storageStatistics.incrementOpCounter(OpType.CREATE);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver() {
@Override
public HdfsDataOutputStream doCall(final Path p) throws IOException {
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 dfs.createWrappedOutputStream(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 cflags, final int bufferSize,
final short replication, final long blockSize,
final Progressable progress, final ChecksumOpt checksumOpt)
throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.CREATE);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver() {
@Override
public FSDataOutputStream doCall(final Path p) throws IOException {
final DFSOutputStream dfsos = dfs.create(getPathName(p), permission,
cflags, replication, blockSize, progress, bufferSize,
checksumOpt);
return dfs.createWrappedOutputStream(dfsos, 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);
}
/**
* Same as
* {@link #create(Path, FsPermission, EnumSet, int, short, long,
* Progressable, ChecksumOpt)} with a few additions. First, 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. And with favored nodes, blocks will be
* pinned on the datanodes to prevent balancing move the block. HDFS could
* move the blocks during replication, to move the blocks from favored nodes.
* A value of null means no favored nodes for this create.
* The second addition is ecPolicyName. A non-null ecPolicyName specifies an
* explicit erasure coding policy for this file, overriding the inherited
* policy. A null ecPolicyName means the file will inherit its EC policy or
* replication policy from its ancestor (the default).
* ecPolicyName and SHOULD_REPLICATE CreateFlag are mutually exclusive. It's
* invalid to set both SHOULD_REPLICATE and a non-null ecPolicyName.
*
*/
private HdfsDataOutputStream create(final Path f,
final FsPermission permission, final EnumSet flag,
final int bufferSize, final short replication, final long blockSize,
final Progressable progress, final ChecksumOpt checksumOpt,
final InetSocketAddress[] favoredNodes, final String ecPolicyName)
throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.CREATE);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver() {
@Override
public HdfsDataOutputStream doCall(final Path p) throws IOException {
final DFSOutputStream out = dfs.create(getPathName(f), permission,
flag, true, replication, blockSize, progress, bufferSize,
checksumOpt, favoredNodes, ecPolicyName);
return dfs.createWrappedOutputStream(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, flag, bufferSize, replication,
blockSize, progress, checksumOpt, favoredNodes, ecPolicyName);
}
throw new UnsupportedOperationException("Cannot create with" +
" favoredNodes through a symlink to a non-DistributedFileSystem: "
+ f + " -> " + p);
}
}.resolve(this, absF);
}
@Override
protected HdfsDataOutputStream primitiveCreate(Path f,
FsPermission absolutePermission, EnumSet flag, int bufferSize,
short replication, long blockSize, Progressable progress,
ChecksumOpt checksumOpt) throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.PRIMITIVE_CREATE);
final DFSOutputStream dfsos = dfs.primitiveCreate(
getPathName(fixRelativePart(f)),
absolutePermission, flag, true, replication, blockSize,
progress, bufferSize, checksumOpt);
return dfs.createWrappedOutputStream(dfsos, statistics);
}
/**
* Similar to {@link #create(Path, FsPermission, EnumSet, int, short, long,
* Progressable, ChecksumOpt, InetSocketAddress[], String)}, it provides a
* HDFS-specific version of {@link #createNonRecursive(Path, FsPermission,
* EnumSet, int, short, long, Progressable)} with a few additions.
*
* @see #create(Path, FsPermission, EnumSet, int, short, long, Progressable,
* ChecksumOpt, InetSocketAddress[], String) for the descriptions of
* additional parameters, i.e., favoredNodes and ecPolicyName.
*/
private HdfsDataOutputStream createNonRecursive(final Path f,
final FsPermission permission, final EnumSet flag,
final int bufferSize, final short replication, final long blockSize,
final Progressable progress, final ChecksumOpt checksumOpt,
final InetSocketAddress[] favoredNodes, final String ecPolicyName)
throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.CREATE);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver() {
@Override
public HdfsDataOutputStream doCall(final Path p) throws IOException {
final DFSOutputStream out = dfs.create(getPathName(f), permission,
flag, false, replication, blockSize, progress, bufferSize,
checksumOpt, favoredNodes, ecPolicyName);
return dfs.createWrappedOutputStream(out, statistics);
}
@Override
public HdfsDataOutputStream next(final FileSystem fs, final Path p)
throws IOException {
if (fs instanceof DistributedFileSystem) {
DistributedFileSystem myDfs = (DistributedFileSystem)fs;
return myDfs.createNonRecursive(p, permission, flag, bufferSize,
replication, blockSize, progress, checksumOpt, favoredNodes,
ecPolicyName);
}
throw new UnsupportedOperationException("Cannot create with" +
" favoredNodes through a symlink to a non-DistributedFileSystem: "
+ f + " -> " + p);
}
}.resolve(this, absF);
}
/**
* Same as create(), except fails if parent directory doesn't already exist.
*/
@Override
public FSDataOutputStream createNonRecursive(final Path f,
final FsPermission permission, final EnumSet flag,
final int bufferSize, final short replication, final long blockSize,
final Progressable progress) throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.CREATE_NON_RECURSIVE);
if (flag.contains(CreateFlag.OVERWRITE)) {
flag.add(CreateFlag.CREATE);
}
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver() {
@Override
public FSDataOutputStream doCall(final Path p) throws IOException {
final DFSOutputStream dfsos = dfs.create(getPathName(p), permission,
flag, false, replication, blockSize, progress, bufferSize, null);
return dfs.createWrappedOutputStream(dfsos, 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);
storageStatistics.incrementOpCounter(OpType.SET_REPLICATION);
Path absF = fixRelativePart(src);
return new FileSystemLinkResolver() {
@Override
public Boolean doCall(final Path p) throws IOException {
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);
}
/**
* Set the source path to the specified storage policy.
*
* @param src The source path referring to either a directory or a file.
* @param policyName The name of the storage policy.
*/
@Override
public void setStoragePolicy(final Path src, final String policyName)
throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.SET_STORAGE_POLICY);
Path absF = fixRelativePart(src);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
dfs.setStoragePolicy(getPathName(p), policyName);
return null;
}
@Override
public Void next(final FileSystem fs, final Path p)
throws IOException {
fs.setStoragePolicy(p, policyName);
return null;
}
}.resolve(this, absF);
}
@Override
public void unsetStoragePolicy(final Path src)
throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.UNSET_STORAGE_POLICY);
Path absF = fixRelativePart(src);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
dfs.unsetStoragePolicy(getPathName(p));
return null;
}
@Override
public Void next(final FileSystem fs, final Path p) throws IOException {
if (fs instanceof DistributedFileSystem) {
((DistributedFileSystem) fs).unsetStoragePolicy(p);
return null;
} else {
throw new UnsupportedOperationException(
"Cannot perform unsetStoragePolicy on a "
+ "non-DistributedFileSystem: " + src + " -> " + p);
}
}
}.resolve(this, absF);
}
@Override
public BlockStoragePolicySpi getStoragePolicy(Path path) throws IOException {
statistics.incrementReadOps(1);
storageStatistics.incrementOpCounter(OpType.GET_STORAGE_POLICY);
Path absF = fixRelativePart(path);
return new FileSystemLinkResolver() {
@Override
public BlockStoragePolicySpi doCall(final Path p) throws IOException {
return getClient().getStoragePolicy(getPathName(p));
}
@Override
public BlockStoragePolicySpi next(final FileSystem fs, final Path p)
throws IOException {
return fs.getStoragePolicy(p);
}
}.resolve(this, absF);
}
@Override
public Collection getAllStoragePolicies()
throws IOException {
return Arrays.asList(dfs.getStoragePolicies());
}
/**
* Returns number of bytes within blocks with future generation stamp. These
* are bytes that will be potentially deleted if we forceExit from safe mode.
*
* @return number of bytes.
*/
public long getBytesWithFutureGenerationStamps() throws IOException {
statistics.incrementReadOps(1);
storageStatistics.incrementOpCounter(OpType.GET_BYTES_WITH_FUTURE_GS);
return dfs.getBytesInFutureBlocks();
}
/**
* Deprecated. Prefer {@link FileSystem#getAllStoragePolicies()}
* @throws IOException
*/
@Deprecated
public BlockStoragePolicy[] getStoragePolicies() throws IOException {
statistics.incrementReadOps(1);
storageStatistics.incrementOpCounter(OpType.GET_STORAGE_POLICIES);
return dfs.getStoragePolicies();
}
/**
* 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);
storageStatistics.incrementOpCounter(OpType.CONCAT);
// Make target absolute
Path absF = fixRelativePart(trg);
// Make all srcs absolute
Path[] srcs = new Path[psrcs.length];
for (int i=0; i " + stat.getPath());
}
absF = fixRelativePart(stat.getPath());
for (int i=0; i " + stat.getPath());
}
srcs[i] = fixRelativePart(stat.getPath());
}
// Try concat again. Can still race with another symlink.
for (int i=0; i() {
@Override
public Boolean doCall(final Path p) throws IOException {
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);
storageStatistics.incrementOpCounter(OpType.RENAME);
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() {
@Override
public Void doCall(final Path p) throws IOException {
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 truncate(Path f, final long newLength) throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.TRUNCATE);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver() {
@Override
public Boolean doCall(final Path p) throws IOException {
return dfs.truncate(getPathName(p), newLength);
}
@Override
public Boolean next(final FileSystem fs, final Path p)
throws IOException {
return fs.truncate(p, newLength);
}
}.resolve(this, absF);
}
@Override
public boolean delete(Path f, final boolean recursive) throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.DELETE);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver() {
@Override
public Boolean doCall(final Path p) throws IOException {
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);
storageStatistics.incrementOpCounter(OpType.GET_CONTENT_SUMMARY);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver() {
@Override
public ContentSummary doCall(final Path p) throws IOException {
return dfs.getContentSummary(getPathName(p));
}
@Override
public ContentSummary next(final FileSystem fs, final Path p)
throws IOException {
return fs.getContentSummary(p);
}
}.resolve(this, absF);
}
@Override
public QuotaUsage getQuotaUsage(Path f) throws IOException {
statistics.incrementReadOps(1);
storageStatistics.incrementOpCounter(OpType.GET_QUOTA_USAGE);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver() {
@Override
public QuotaUsage doCall(final Path p)
throws IOException, UnresolvedLinkException {
return dfs.getQuotaUsage(getPathName(p));
}
@Override
public QuotaUsage next(final FileSystem fs, final Path p)
throws IOException {
return fs.getQuotaUsage(p);
}
}.resolve(this, absF);
}
/** Set a directory's quotas
* @see org.apache.hadoop.hdfs.protocol.ClientProtocol#setQuota(String,
* long, long, StorageType)
*/
public void setQuota(Path src, final long namespaceQuota,
final long storagespaceQuota) throws IOException {
Path absF = fixRelativePart(src);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
dfs.setQuota(getPathName(p), namespaceQuota, storagespaceQuota);
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);
}
/**
* Set the per type storage quota of a directory.
*
* @param src target directory whose quota is to be modified.
* @param type storage type of the specific storage type quota to be modified.
* @param quota value of the specific storage type quota to be modified.
* Maybe {@link HdfsConstants#QUOTA_RESET} to clear quota by storage type.
*/
public void setQuotaByStorageType(Path src, final StorageType type,
final long quota)
throws IOException {
Path absF = fixRelativePart(src);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
dfs.setQuotaByStorageType(getPathName(p), type, quota);
return null;
}
@Override
public Void next(final FileSystem fs, final Path p)
throws IOException {
// setQuotaByStorageType 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);
storageStatistics.incrementOpCounter(OpType.LIST_STATUS);
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 listing =
new ArrayList<>(totalNumEntries);
// add the first batch of entries to the array list
for (HdfsFileStatus fileStatus : partialListing) {
listing.add(fileStatus.makeQualified(getUri(), p));
}
statistics.incrementLargeReadOps(1);
storageStatistics.incrementOpCounter(OpType.LIST_STATUS);
// 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);
storageStatistics.incrementOpCounter(OpType.LIST_STATUS);
} 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() {
@Override
public FileStatus[] doCall(final Path p) throws IOException {
return listStatusInternal(p);
}
@Override
public FileStatus[] next(final FileSystem fs, final Path p)
throws IOException {
return fs.listStatus(p);
}
}.resolve(this, absF);
}
/**
* The BlockLocation of returned LocatedFileStatus will have different
* formats for replicated and erasure coded file.
* Please refer to
* {@link FileSystem#getFileBlockLocations(FileStatus, long, long)} for
* more details.
*/
@Override
protected RemoteIterator listLocatedStatus(final Path p,
final PathFilter filter)
throws IOException {
Path absF = fixRelativePart(p);
return new FileSystemLinkResolver>() {
@Override
public RemoteIterator doCall(final Path p)
throws IOException {
return new DirListingIterator<>(p, filter, true);
}
@Override
public RemoteIterator next(final FileSystem fs,
final Path p) throws IOException {
if (fs instanceof DistributedFileSystem) {
return ((DistributedFileSystem)fs).listLocatedStatus(p, filter);
}
// symlink resolution for this methos does not work cross file systems
// because it is a protected method.
throw new IOException("Link resolution does not work with multiple " +
"file systems for listLocatedStatus(): " + p);
}
}.resolve(this, absF);
}
/**
* Returns a remote iterator so that followup calls are made on demand
* while consuming the entries. This reduces memory consumption during
* listing of a large directory.
*
* @param p target path
* @return remote iterator
*/
@Override
public RemoteIterator listStatusIterator(final Path p)
throws IOException {
Path absF = fixRelativePart(p);
return new FileSystemLinkResolver>() {
@Override
public RemoteIterator doCall(final Path p)
throws IOException {
return new DirListingIterator<>(p, false);
}
@Override
public RemoteIterator next(final FileSystem fs, final Path p)
throws IOException {
return ((DistributedFileSystem)fs).listStatusIterator(p);
}
}.resolve(this, absF);
}
/**
* This class defines an iterator that returns
* the file status of each file/subdirectory of a directory
*
* if needLocation, status contains block location if it is a file
* throws a RuntimeException with the error as its cause.
*
* @param the type of the file status
*/
private class DirListingIterator
implements RemoteIterator {
private DirectoryListing thisListing;
private int i;
private Path p;
private String src;
private T curStat = null;
private PathFilter filter;
private boolean needLocation;
private DirListingIterator(Path p, PathFilter filter,
boolean needLocation) throws IOException {
this.p = p;
this.src = getPathName(p);
this.filter = filter;
this.needLocation = needLocation;
// fetch the first batch of entries in the directory
thisListing = dfs.listPaths(src, HdfsFileStatus.EMPTY_NAME,
needLocation);
statistics.incrementReadOps(1);
if (needLocation) {
storageStatistics.incrementOpCounter(OpType.LIST_LOCATED_STATUS);
} else {
storageStatistics.incrementOpCounter(OpType.LIST_STATUS);
}
if (thisListing == null) { // the directory does not exist
throw new FileNotFoundException("File " + p + " does not exist.");
}
i = 0;
}
private DirListingIterator(Path p, boolean needLocation)
throws IOException {
this(p, null, needLocation);
}
@Override
@SuppressWarnings("unchecked")
public boolean hasNext() throws IOException {
while (curStat == null && hasNextNoFilter()) {
T next;
HdfsFileStatus fileStat = thisListing.getPartialListing()[i++];
if (needLocation) {
next = (T)((HdfsLocatedFileStatus)fileStat)
.makeQualifiedLocated(getUri(), p);
} else {
next = (T)fileStat.makeQualified(getUri(), p);
}
// apply filter if not null
if (filter == null || 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(),
needLocation);
statistics.incrementReadOps(1);
if (thisListing == null) {
throw new FileNotFoundException("File " + p + " does not exist.");
}
i = 0;
}
return (i < thisListing.getPartialListing().length);
}
@Override
public T next() throws IOException {
if (hasNext()) {
T 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);
storageStatistics.incrementOpCounter(OpType.MKDIRS);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver() {
@Override
public Boolean doCall(final Path p) throws IOException {
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);
storageStatistics.incrementOpCounter(OpType.PRIMITIVE_MKDIR);
return dfs.primitiveMkdir(getPathName(f), absolutePermission);
}
@Override
public void close() throws IOException {
try {
dfs.closeOutputStreams(false);
super.close();
} finally {
dfs.close();
}
}
@Override
public String toString() {
return "DFS[" + dfs + "]";
}
@InterfaceAudience.Private
@VisibleForTesting
public DFSClient getClient() {
return dfs;
}
@Override
public FsStatus getStatus(Path p) throws IOException {
statistics.incrementReadOps(1);
storageStatistics.incrementOpCounter(OpType.GET_STATUS);
return dfs.getDiskStatus();
}
/**
* 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 pending on deletion.
*
* @throws IOException
*/
public long getPendingDeletionBlocksCount() throws IOException {
return dfs.getPendingDeletionBlocksCount();
}
/**
* Returns count of blocks with replication factor 1 and have
* lost the only replica.
*
* @throws IOException
*/
public long getMissingReplOneBlocksCount() throws IOException {
return dfs.getMissingReplOneBlocksCount();
}
/**
* Returns aggregated count of blocks with less redundancy.
*
* @throws IOException
*/
public long getLowRedundancyBlocksCount() throws IOException {
return dfs.getLowRedundancyBlocksCount();
}
/**
* Returns count of blocks with at least one replica marked corrupt.
*
* @throws IOException
*/
public long getCorruptBlocksCount() throws IOException {
return dfs.getCorruptBlocksCount();
}
@Override
public RemoteIterator listCorruptFileBlocks(final Path path)
throws IOException {
Path absF = fixRelativePart(path);
return new FileSystemLinkResolver>() {
@Override
public RemoteIterator doCall(final Path path) throws IOException,
UnresolvedLinkException {
return new CorruptFileBlockIterator(dfs, path);
}
@Override
public RemoteIterator next(final FileSystem fs, final Path path)
throws IOException {
return fs.listCorruptFileBlocks(path);
}
}.resolve(this, absF);
}
/** @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.
*
* @param timeWindow NameNode can ignore this command if the latest
* checkpoint was done within the given time period (in
* seconds).
* @return true if a new checkpoint has been made
* @see ClientProtocol#saveNamespace(long, long)
*/
public boolean saveNamespace(long timeWindow, long txGap) throws IOException {
return dfs.saveNamespace(timeWindow, txGap);
}
/**
* Save namespace image. NameNode always does the checkpoint.
*/
public void saveNamespace() throws IOException {
saveNamespace(0, 0);
}
/**
* 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 IOException {
return dfs.rollEdits();
}
/**
* enable/disable/check restoreFaileStorage
*
* @see org.apache.hadoop.hdfs.protocol.ClientProtocol#restoreFailedStorage(String arg)
*/
public boolean restoreFailedStorage(String arg) throws 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();
}
/**
* Get status of upgrade - finalized or not.
* @return true if upgrade is finalized or if no upgrade is in progress and
* false otherwise.
* @throws IOException
*/
public boolean upgradeStatus() throws IOException {
return dfs.upgradeStatus();
}
/**
* Rolling upgrade: prepare/finalize/query.
*/
public RollingUpgradeInfo rollingUpgrade(RollingUpgradeAction action)
throws IOException {
return dfs.rollingUpgrade(action);
}
/*
* 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();
}
/**
* 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);
storageStatistics.incrementOpCounter(OpType.GET_FILE_STATUS);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver() {
@Override
public FileStatus doCall(final Path p) throws IOException {
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 IOException {
if (!FileSystem.areSymlinksEnabled()) {
throw new UnsupportedOperationException("Symlinks not supported");
}
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.CREATE_SYM_LINK);
final Path absF = fixRelativePart(link);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
dfs.createSymlink(target.toString(), getPathName(p), createParent);
return null;
}
@Override
public Void next(final FileSystem fs, final Path p) throws IOException {
fs.createSymlink(target, p, createParent);
return null;
}
}.resolve(this, absF);
}
@Override
public boolean supportsSymlinks() {
return true;
}
@Override
public FileStatus getFileLinkStatus(final Path f) throws IOException {
statistics.incrementReadOps(1);
storageStatistics.incrementOpCounter(OpType.GET_FILE_LINK_STATUS);
final Path absF = fixRelativePart(f);
FileStatus status = new FileSystemLinkResolver() {
@Override
public FileStatus doCall(final Path p) throws IOException {
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 {
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 IOException {
statistics.incrementReadOps(1);
storageStatistics.incrementOpCounter(OpType.GET_LINK_TARGET);
final Path absF = fixRelativePart(f);
return new FileSystemLinkResolver() {
@Override
public Path doCall(final Path p) throws IOException {
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 {
return fs.getLinkTarget(p);
}
}.resolve(this, absF);
}
@Override
protected Path resolveLink(Path f) throws IOException {
statistics.incrementReadOps(1);
storageStatistics.incrementOpCounter(OpType.RESOLVE_LINK);
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);
storageStatistics.incrementOpCounter(OpType.GET_FILE_CHECKSUM);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver() {
@Override
public FileChecksum doCall(final Path p) throws IOException {
return dfs.getFileChecksumWithCombineMode(
getPathName(p), Long.MAX_VALUE);
}
@Override
public FileChecksum next(final FileSystem fs, final Path p)
throws IOException {
return fs.getFileChecksum(p);
}
}.resolve(this, absF);
}
@Override
public FileChecksum getFileChecksum(Path f, final long length)
throws IOException {
statistics.incrementReadOps(1);
storageStatistics.incrementOpCounter(OpType.GET_FILE_CHECKSUM);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver() {
@Override
public FileChecksum doCall(final Path p) throws IOException {
return dfs.getFileChecksumWithCombineMode(getPathName(p), length);
}
@Override
public FileChecksum next(final FileSystem fs, final Path p)
throws IOException {
if (fs instanceof DistributedFileSystem) {
return fs.getFileChecksum(p, length);
} else {
throw new UnsupportedFileSystemException(
"getFileChecksum(Path, long) is not supported by "
+ fs.getClass().getSimpleName());
}
}
}.resolve(this, absF);
}
@Override
public void setPermission(Path p, final FsPermission permission
) throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.SET_PERMISSION);
Path absF = fixRelativePart(p);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
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);
storageStatistics.incrementOpCounter(OpType.SET_OWNER);
Path absF = fixRelativePart(p);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
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);
storageStatistics.incrementOpCounter(OpType.SET_TIMES);
Path absF = fixRelativePart(p);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
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 HdfsClientConfigKeys.DFS_NAMENODE_RPC_PORT_DEFAULT;
}
@Override
public Token getDelegationToken(String renewer)
throws IOException {
return dfs.getDelegationToken(renewer == null ? null : new Text(renewer));
}
/**
* Requests the namenode to tell all datanodes to use a new, non-persistent
* bandwidth value for dfs.datanode.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 (HAUtilClient.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 {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.ALLOW_SNAPSHOT);
Path absF = fixRelativePart(path);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
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 {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.DISALLOW_SNAPSHOT);
Path absF = fixRelativePart(path);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
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 {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.CREATE_SNAPSHOT);
Path absF = fixRelativePart(path);
return new FileSystemLinkResolver() {
@Override
public Path doCall(final Path p) throws IOException {
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 {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.RENAME_SNAPSHOT);
Path absF = fixRelativePart(path);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
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 {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.DELETE_SNAPSHOT);
Path absF = fixRelativePart(snapshotDir);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
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);
}
/**
* Returns a remote iterator so that followup calls are made on demand
* while consuming the SnapshotDiffReportListing entries.
* This reduces memory consumption overhead in case the snapshotDiffReport
* is huge.
*
* @param snapshotDir
* full path of the directory where snapshots are taken
* @param fromSnapshot
* snapshot name of the from point. Null indicates the current
* tree
* @param toSnapshot
* snapshot name of the to point. Null indicates the current
* tree.
* @return Remote iterator
*/
public RemoteIterator
snapshotDiffReportListingRemoteIterator(
final Path snapshotDir, final String fromSnapshot,
final String toSnapshot) throws IOException {
Path absF = fixRelativePart(snapshotDir);
return new FileSystemLinkResolver
>() {
@Override
public RemoteIterator doCall(final Path p)
throws IOException {
if (!isValidSnapshotName(fromSnapshot) || !isValidSnapshotName(
toSnapshot)) {
throw new UnsupportedOperationException("Remote Iterator is"
+ "supported for snapshotDiffReport between two snapshots");
}
return new SnapshotDiffReportListingIterator(getPathName(p),
fromSnapshot, toSnapshot);
}
@Override
public RemoteIterator next(final FileSystem fs,
final Path p) throws IOException {
return ((DistributedFileSystem) fs)
.snapshotDiffReportListingRemoteIterator(p, fromSnapshot,
toSnapshot);
}
}.resolve(this, absF);
}
/**
* This class defines an iterator that returns
* the SnapshotDiffReportListing for a snapshottable directory
* between two given snapshots.
*/
private final class SnapshotDiffReportListingIterator implements
RemoteIterator {
private final String snapshotDir;
private final String fromSnapshot;
private final String toSnapshot;
private byte[] startPath;
private int index;
private boolean hasNext = true;
private SnapshotDiffReportListingIterator(String snapshotDir,
String fromSnapshot, String toSnapshot) {
this.snapshotDir = snapshotDir;
this.fromSnapshot = fromSnapshot;
this.toSnapshot = toSnapshot;
this.startPath = DFSUtilClient.EMPTY_BYTES;
this.index = -1;
}
@Override
public boolean hasNext() {
return hasNext;
}
@Override
public SnapshotDiffReportListing next() throws IOException {
if (!hasNext) {
throw new java.util.NoSuchElementException(
"No more entry in SnapshotDiffReport for " + snapshotDir);
}
final SnapshotDiffReportListing part =
dfs.getSnapshotDiffReportListing(snapshotDir, fromSnapshot,
toSnapshot, startPath, index);
startPath = part.getLastPath();
index = part.getLastIndex();
hasNext =
!(Arrays.equals(startPath, DFSUtilClient.EMPTY_BYTES) && index == -1);
return part;
}
}
private boolean isValidSnapshotName(String snapshotName) {
// If any of the snapshots specified in the getSnapshotDiffReport call
// is null or empty, it points to the current tree.
return (snapshotName != null && !snapshotName.isEmpty());
}
private SnapshotDiffReport getSnapshotDiffReportInternal(
final String snapshotDir, final String fromSnapshot,
final String toSnapshot) throws IOException {
// In case the diff needs to be computed between a snapshot and the current
// tree, we should not do iterative diffReport computation as the iterative
// approach might fail if in between the rpc calls the current tree
// changes in absence of the global fsn lock.
if (!isValidSnapshotName(fromSnapshot) || !isValidSnapshotName(
toSnapshot)) {
return dfs.getSnapshotDiffReport(snapshotDir, fromSnapshot, toSnapshot);
}
byte[] startPath = DFSUtilClient.EMPTY_BYTES;
int index = -1;
SnapshotDiffReportGenerator snapshotDiffReport;
List modifiedList = new TreeList();
List createdList = new ChunkedArrayList<>();
List deletedList = new ChunkedArrayList<>();
SnapshotDiffReportListing report;
do {
report = dfs.getSnapshotDiffReportListing(snapshotDir, fromSnapshot,
toSnapshot, startPath, index);
startPath = report.getLastPath();
index = report.getLastIndex();
modifiedList.addAll(report.getModifyList());
createdList.addAll(report.getCreateList());
deletedList.addAll(report.getDeleteList());
} while (!(Arrays.equals(startPath, DFSUtilClient.EMPTY_BYTES)
&& index == -1));
snapshotDiffReport =
new SnapshotDiffReportGenerator(snapshotDir, fromSnapshot, toSnapshot,
report.getIsFromEarlier(), modifiedList, createdList, deletedList);
return snapshotDiffReport.generateReport();
}
/**
* Get the difference between two snapshots, or between a snapshot and the
* current tree of a directory.
*
* @see DFSClient#getSnapshotDiffReportListing
*/
public SnapshotDiffReport getSnapshotDiffReport(final Path snapshotDir,
final String fromSnapshot, final String toSnapshot) throws IOException {
Path absF = fixRelativePart(snapshotDir);
return new FileSystemLinkResolver() {
@Override
public SnapshotDiffReport doCall(final Path p)
throws IOException {
return getSnapshotDiffReportInternal(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() {
@Override
public Boolean doCall(final Path p) throws IOException {
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);
}
/**
* @see {@link #addCacheDirective(CacheDirectiveInfo, EnumSet)}
*/
public long addCacheDirective(CacheDirectiveInfo info) throws IOException {
return addCacheDirective(info, EnumSet.noneOf(CacheFlag.class));
}
/**
* Add a new CacheDirective.
*
* @param info Information about a directive to add.
* @param flags {@link CacheFlag}s to use for this operation.
* @return the ID of the directive that was created.
* @throws IOException if the directive could not be added
*/
public long addCacheDirective(
CacheDirectiveInfo info, EnumSet flags) throws IOException {
Preconditions.checkNotNull(info.getPath());
Path path = new Path(getPathName(fixRelativePart(info.getPath()))).
makeQualified(getUri(), getWorkingDirectory());
return dfs.addCacheDirective(
new CacheDirectiveInfo.Builder(info).
setPath(path).
build(),
flags);
}
/**
* @see {@link #modifyCacheDirective(CacheDirectiveInfo, EnumSet)}
*/
public void modifyCacheDirective(CacheDirectiveInfo info) throws IOException {
modifyCacheDirective(info, EnumSet.noneOf(CacheFlag.class));
}
/**
* Modify a CacheDirective.
*
* @param info Information about the directive to modify. You must set the ID
* to indicate which CacheDirective you want to modify.
* @param flags {@link CacheFlag}s to use for this operation.
* @throws IOException if the directive could not be modified
*/
public void modifyCacheDirective(
CacheDirectiveInfo info, EnumSet flags) throws IOException {
if (info.getPath() != null) {
info = new CacheDirectiveInfo.Builder(info).
setPath(new Path(getPathName(fixRelativePart(info.getPath()))).
makeQualified(getUri(), getWorkingDirectory())).build();
}
dfs.modifyCacheDirective(info, flags);
}
/**
* Remove a CacheDirectiveInfo.
*
* @param id identifier of the CacheDirectiveInfo to remove
* @throws IOException if the directive could not be removed
*/
public void removeCacheDirective(long id)
throws IOException {
dfs.removeCacheDirective(id);
}
/**
* List cache directives. Incrementally fetches results from the server.
*
* @param filter Filter parameters to use when listing the directives, null to
* list all directives visible to us.
* @return A RemoteIterator which returns CacheDirectiveInfo objects.
*/
public RemoteIterator listCacheDirectives(
CacheDirectiveInfo filter) throws IOException {
if (filter == null) {
filter = new CacheDirectiveInfo.Builder().build();
}
if (filter.getPath() != null) {
filter = new CacheDirectiveInfo.Builder(filter).
setPath(new Path(getPathName(fixRelativePart(filter.getPath())))).
build();
}
final RemoteIterator iter =
dfs.listCacheDirectives(filter);
return new RemoteIterator() {
@Override
public boolean hasNext() throws IOException {
return iter.hasNext();
}
@Override
public CacheDirectiveEntry next() throws IOException {
// Although the paths we get back from the NameNode should always be
// absolute, we call makeQualified to add the scheme and authority of
// this DistributedFilesystem.
CacheDirectiveEntry desc = iter.next();
CacheDirectiveInfo info = desc.getInfo();
Path p = info.getPath().makeQualified(getUri(), getWorkingDirectory());
return new CacheDirectiveEntry(
new CacheDirectiveInfo.Builder(info).setPath(p).build(),
desc.getStats());
}
};
}
/**
* Add a cache pool.
*
* @param info
* The request to add a cache pool.
* @throws IOException
* If the request could not be completed.
*/
public void addCachePool(CachePoolInfo info) throws IOException {
CachePoolInfo.validate(info);
dfs.addCachePool(info);
}
/**
* Modify an existing cache pool.
*
* @param info
* The request to modify a cache pool.
* @throws IOException
* If the request could not be completed.
*/
public void modifyCachePool(CachePoolInfo info) throws IOException {
CachePoolInfo.validate(info);
dfs.modifyCachePool(info);
}
/**
* Remove a cache pool.
*
* @param poolName
* Name of the cache pool to remove.
* @throws IOException
* if the cache pool did not exist, or could not be removed.
*/
public void removeCachePool(String poolName) throws IOException {
CachePoolInfo.validateName(poolName);
dfs.removeCachePool(poolName);
}
/**
* List all cache pools.
*
* @return A remote iterator from which you can get CachePoolEntry objects.
* Requests will be made as needed.
* @throws IOException
* If there was an error listing cache pools.
*/
public RemoteIterator listCachePools() throws IOException {
return dfs.listCachePools();
}
/**
* {@inheritDoc}
*/
@Override
public void modifyAclEntries(Path path, final List aclSpec)
throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.MODIFY_ACL_ENTRIES);
Path absF = fixRelativePart(path);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
dfs.modifyAclEntries(getPathName(p), aclSpec);
return null;
}
@Override
public Void next(final FileSystem fs, final Path p) throws IOException {
fs.modifyAclEntries(p, aclSpec);
return null;
}
}.resolve(this, absF);
}
/**
* {@inheritDoc}
*/
@Override
public void removeAclEntries(Path path, final List aclSpec)
throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.REMOVE_ACL_ENTRIES);
Path absF = fixRelativePart(path);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
dfs.removeAclEntries(getPathName(p), aclSpec);
return null;
}
@Override
public Void next(final FileSystem fs, final Path p) throws IOException {
fs.removeAclEntries(p, aclSpec);
return null;
}
}.resolve(this, absF);
}
/**
* {@inheritDoc}
*/
@Override
public void removeDefaultAcl(Path path) throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.REMOVE_DEFAULT_ACL);
final Path absF = fixRelativePart(path);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
dfs.removeDefaultAcl(getPathName(p));
return null;
}
@Override
public Void next(final FileSystem fs, final Path p) throws IOException {
fs.removeDefaultAcl(p);
return null;
}
}.resolve(this, absF);
}
/**
* {@inheritDoc}
*/
@Override
public void removeAcl(Path path) throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.REMOVE_ACL);
final Path absF = fixRelativePart(path);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
dfs.removeAcl(getPathName(p));
return null;
}
@Override
public Void next(final FileSystem fs, final Path p) throws IOException {
fs.removeAcl(p);
return null;
}
}.resolve(this, absF);
}
/**
* {@inheritDoc}
*/
@Override
public void setAcl(Path path, final List aclSpec)
throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.SET_ACL);
Path absF = fixRelativePart(path);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
dfs.setAcl(getPathName(p), aclSpec);
return null;
}
@Override
public Void next(final FileSystem fs, final Path p) throws IOException {
fs.setAcl(p, aclSpec);
return null;
}
}.resolve(this, absF);
}
/**
* {@inheritDoc}
*/
@Override
public AclStatus getAclStatus(Path path) throws IOException {
final Path absF = fixRelativePart(path);
return new FileSystemLinkResolver() {
@Override
public AclStatus doCall(final Path p) throws IOException {
return dfs.getAclStatus(getPathName(p));
}
@Override
public AclStatus next(final FileSystem fs, final Path p)
throws IOException {
return fs.getAclStatus(p);
}
}.resolve(this, absF);
}
/* HDFS only */
public void createEncryptionZone(final Path path, final String keyName)
throws IOException {
Path absF = fixRelativePart(path);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
dfs.createEncryptionZone(getPathName(p), keyName);
return null;
}
@Override
public Void next(final FileSystem fs, final Path p) throws IOException {
if (fs instanceof DistributedFileSystem) {
DistributedFileSystem myDfs = (DistributedFileSystem) fs;
myDfs.createEncryptionZone(p, keyName);
return null;
} else {
throw new UnsupportedOperationException(
"Cannot call createEncryptionZone"
+ " on a symlink to a non-DistributedFileSystem: " + path
+ " -> " + p);
}
}
}.resolve(this, absF);
}
/* HDFS only */
public EncryptionZone getEZForPath(final Path path)
throws IOException {
Preconditions.checkNotNull(path);
Path absF = fixRelativePart(path);
return new FileSystemLinkResolver() {
@Override
public EncryptionZone doCall(final Path p) throws IOException {
return dfs.getEZForPath(getPathName(p));
}
@Override
public EncryptionZone next(final FileSystem fs, final Path p)
throws IOException {
if (fs instanceof DistributedFileSystem) {
DistributedFileSystem myDfs = (DistributedFileSystem) fs;
return myDfs.getEZForPath(p);
} else {
throw new UnsupportedOperationException(
"Cannot call getEZForPath"
+ " on a symlink to a non-DistributedFileSystem: " + path
+ " -> " + p);
}
}
}.resolve(this, absF);
}
/* HDFS only */
public RemoteIterator listEncryptionZones()
throws IOException {
return dfs.listEncryptionZones();
}
/* HDFS only */
public void reencryptEncryptionZone(final Path zone,
final ReencryptAction action) throws IOException {
final Path absF = fixRelativePart(zone);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
dfs.reencryptEncryptionZone(getPathName(p), action);
return null;
}
@Override
public Void next(final FileSystem fs, final Path p) throws IOException {
if (fs instanceof DistributedFileSystem) {
DistributedFileSystem myDfs = (DistributedFileSystem) fs;
myDfs.reencryptEncryptionZone(p, action);
return null;
}
throw new UnsupportedOperationException(
"Cannot call reencryptEncryptionZone"
+ " on a symlink to a non-DistributedFileSystem: " + zone
+ " -> " + p);
}
}.resolve(this, absF);
}
/* HDFS only */
public RemoteIterator listReencryptionStatus()
throws IOException {
return dfs.listReencryptionStatus();
}
/* HDFS only */
public FileEncryptionInfo getFileEncryptionInfo(final Path path)
throws IOException {
Path absF = fixRelativePart(path);
return new FileSystemLinkResolver() {
@Override
public FileEncryptionInfo doCall(final Path p) throws IOException {
final HdfsFileStatus fi = dfs.getFileInfo(getPathName(p));
if (fi == null) {
throw new FileNotFoundException("File does not exist: " + p);
}
return fi.getFileEncryptionInfo();
}
@Override
public FileEncryptionInfo next(final FileSystem fs, final Path p)
throws IOException {
if (fs instanceof DistributedFileSystem) {
DistributedFileSystem myDfs = (DistributedFileSystem)fs;
return myDfs.getFileEncryptionInfo(p);
}
throw new UnsupportedOperationException(
"Cannot call getFileEncryptionInfo"
+ " on a symlink to a non-DistributedFileSystem: " + path
+ " -> " + p);
}
}.resolve(this, absF);
}
/* HDFS only */
public void provisionEZTrash(final Path path,
final FsPermission trashPermission) throws IOException {
Path absF = fixRelativePart(path);
new FileSystemLinkResolver() {
@Override
public Void doCall(Path p) throws IOException {
provisionEZTrash(getPathName(p), trashPermission);
return null;
}
@Override
public Void next(FileSystem fs, Path p) throws IOException {
if (fs instanceof DistributedFileSystem) {
DistributedFileSystem myDfs = (DistributedFileSystem)fs;
myDfs.provisionEZTrash(p, trashPermission);
return null;
}
throw new UnsupportedOperationException("Cannot provisionEZTrash " +
"through a symlink to a non-DistributedFileSystem: " + fs + " -> "
+ p);
}
}.resolve(this, absF);
}
private void provisionEZTrash(String path, FsPermission trashPermission)
throws IOException {
// make sure the path is an EZ
EncryptionZone ez = dfs.getEZForPath(path);
if (ez == null) {
throw new IllegalArgumentException(path + " is not an encryption zone.");
}
String ezPath = ez.getPath();
if (!path.toString().equals(ezPath)) {
throw new IllegalArgumentException(path + " is not the root of an " +
"encryption zone. Do you mean " + ez.getPath() + "?");
}
// check if the trash directory exists
Path trashPath = new Path(ez.getPath(), FileSystem.TRASH_PREFIX);
try {
FileStatus trashFileStatus = getFileStatus(trashPath);
String errMessage = "Will not provision new trash directory for " +
"encryption zone " + ez.getPath() + ". Path already exists.";
if (!trashFileStatus.isDirectory()) {
errMessage += "\r\n" +
"Warning: " + trashPath.toString() + " is not a directory";
}
if (!trashFileStatus.getPermission().equals(trashPermission)) {
errMessage += "\r\n" +
"Warning: the permission of " +
trashPath.toString() + " is not " + trashPermission;
}
throw new FileAlreadyExistsException(errMessage);
} catch (FileNotFoundException ignored) {
// no trash path
}
// Update the permission bits
mkdir(trashPath, trashPermission);
setPermission(trashPath, trashPermission);
}
@Override
public void setXAttr(Path path, final String name, final byte[] value,
final EnumSet flag) throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.SET_XATTR);
Path absF = fixRelativePart(path);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
dfs.setXAttr(getPathName(p), name, value, flag);
return null;
}
@Override
public Void next(final FileSystem fs, final Path p) throws IOException {
fs.setXAttr(p, name, value, flag);
return null;
}
}.resolve(this, absF);
}
@Override
public byte[] getXAttr(Path path, final String name) throws IOException {
statistics.incrementReadOps(1);
storageStatistics.incrementOpCounter(OpType.GET_XATTR);
final Path absF = fixRelativePart(path);
return new FileSystemLinkResolver() {
@Override
public byte[] doCall(final Path p) throws IOException {
return dfs.getXAttr(getPathName(p), name);
}
@Override
public byte[] next(final FileSystem fs, final Path p) throws IOException {
return fs.getXAttr(p, name);
}
}.resolve(this, absF);
}
@Override
public Map getXAttrs(Path path) throws IOException {
final Path absF = fixRelativePart(path);
return new FileSystemLinkResolver>() {
@Override
public Map doCall(final Path p) throws IOException {
return dfs.getXAttrs(getPathName(p));
}
@Override
public Map next(final FileSystem fs, final Path p)
throws IOException {
return fs.getXAttrs(p);
}
}.resolve(this, absF);
}
@Override
public Map getXAttrs(Path path, final List names)
throws IOException {
final Path absF = fixRelativePart(path);
return new FileSystemLinkResolver>() {
@Override
public Map doCall(final Path p) throws IOException {
return dfs.getXAttrs(getPathName(p), names);
}
@Override
public Map next(final FileSystem fs, final Path p)
throws IOException {
return fs.getXAttrs(p, names);
}
}.resolve(this, absF);
}
@Override
public List listXAttrs(Path path)
throws IOException {
final Path absF = fixRelativePart(path);
return new FileSystemLinkResolver>() {
@Override
public List doCall(final Path p) throws IOException {
return dfs.listXAttrs(getPathName(p));
}
@Override
public List next(final FileSystem fs, final Path p)
throws IOException {
return fs.listXAttrs(p);
}
}.resolve(this, absF);
}
@Override
public void removeXAttr(Path path, final String name) throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.REMOVE_XATTR);
Path absF = fixRelativePart(path);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
dfs.removeXAttr(getPathName(p), name);
return null;
}
@Override
public Void next(final FileSystem fs, final Path p) throws IOException {
fs.removeXAttr(p, name);
return null;
}
}.resolve(this, absF);
}
@Override
public void access(Path path, final FsAction mode) throws IOException {
final Path absF = fixRelativePart(path);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
dfs.checkAccess(getPathName(p), mode);
return null;
}
@Override
public Void next(final FileSystem fs, final Path p)
throws IOException {
fs.access(p, mode);
return null;
}
}.resolve(this, absF);
}
@Override
public URI getKeyProviderUri() throws IOException {
return dfs.getKeyProviderUri();
}
@Override
public KeyProvider getKeyProvider() throws IOException {
return dfs.getKeyProvider();
}
@Override
public DelegationTokenIssuer[] getAdditionalTokenIssuers()
throws IOException {
KeyProvider keyProvider = getKeyProvider();
if (keyProvider instanceof DelegationTokenIssuer) {
return new DelegationTokenIssuer[]{(DelegationTokenIssuer)keyProvider};
}
return null;
}
public DFSInotifyEventInputStream getInotifyEventStream() throws IOException {
return dfs.getInotifyEventStream();
}
public DFSInotifyEventInputStream getInotifyEventStream(long lastReadTxid)
throws IOException {
return dfs.getInotifyEventStream(lastReadTxid);
}
/**
* Set the source path to the specified erasure coding policy.
*
* @param path The directory to set the policy
* @param ecPolicyName The erasure coding policy name.
* @throws IOException
*/
public void setErasureCodingPolicy(final Path path,
final String ecPolicyName) throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.SET_EC_POLICY);
Path absF = fixRelativePart(path);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
dfs.setErasureCodingPolicy(getPathName(p), ecPolicyName);
return null;
}
@Override
public Void next(final FileSystem fs, final Path p) throws IOException {
if (fs instanceof DistributedFileSystem) {
DistributedFileSystem myDfs = (DistributedFileSystem) fs;
myDfs.setErasureCodingPolicy(p, ecPolicyName);
return null;
}
throw new UnsupportedOperationException(
"Cannot setErasureCodingPolicy through a symlink to a "
+ "non-DistributedFileSystem: " + path + " -> " + p);
}
}.resolve(this, absF);
}
/**
* Get erasure coding policy information for the specified path
*
* @param path The path of the file or directory
* @return Returns the policy information if file or directory on the path
* is erasure coded, null otherwise. Null will be returned if directory or
* file has REPLICATION policy.
* @throws IOException
*/
public ErasureCodingPolicy getErasureCodingPolicy(final Path path)
throws IOException {
statistics.incrementReadOps(1);
storageStatistics.incrementOpCounter(OpType.GET_EC_POLICY);
Path absF = fixRelativePart(path);
return new FileSystemLinkResolver() {
@Override
public ErasureCodingPolicy doCall(final Path p) throws IOException {
return dfs.getErasureCodingPolicy(getPathName(p));
}
@Override
public ErasureCodingPolicy next(final FileSystem fs, final Path p)
throws IOException {
if (fs instanceof DistributedFileSystem) {
DistributedFileSystem myDfs = (DistributedFileSystem) fs;
return myDfs.getErasureCodingPolicy(p);
}
throw new UnsupportedOperationException(
"Cannot getErasureCodingPolicy through a symlink to a "
+ "non-DistributedFileSystem: " + path + " -> " + p);
}
}.resolve(this, absF);
}
/**
* Retrieve all the erasure coding policies supported by this file system,
* including enabled, disabled and removed policies, but excluding
* REPLICATION policy.
*
* @return all erasure coding policies supported by this file system.
* @throws IOException
*/
public Collection getAllErasureCodingPolicies()
throws IOException {
statistics.incrementReadOps(1);
storageStatistics.incrementOpCounter(OpType.GET_EC_POLICIES);
return Arrays.asList(dfs.getErasureCodingPolicies());
}
/**
* Retrieve all the erasure coding codecs and coders supported by this file
* system.
*
* @return all erasure coding codecs and coders supported by this file system.
* @throws IOException
*/
public Map getAllErasureCodingCodecs()
throws IOException {
statistics.incrementReadOps(1);
storageStatistics.incrementOpCounter(OpType.GET_EC_CODECS);
return dfs.getErasureCodingCodecs();
}
/**
* Add Erasure coding policies to HDFS. For each policy input, schema and
* cellSize are musts, name and id are ignored. They will be automatically
* created and assigned by Namenode once the policy is successfully added,
* and will be returned in the response; policy states will be set to
* DISABLED automatically.
*
* @param policies The user defined ec policy list to add.
* @return Return the response list of adding operations.
* @throws IOException
*/
public AddErasureCodingPolicyResponse[] addErasureCodingPolicies(
ErasureCodingPolicy[] policies) throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.ADD_EC_POLICY);
return dfs.addErasureCodingPolicies(policies);
}
/**
* Remove erasure coding policy.
*
* @param ecPolicyName The name of the policy to be removed.
* @throws IOException
*/
public void removeErasureCodingPolicy(String ecPolicyName)
throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.REMOVE_EC_POLICY);
dfs.removeErasureCodingPolicy(ecPolicyName);
}
/**
* Enable erasure coding policy.
*
* @param ecPolicyName The name of the policy to be enabled.
* @throws IOException
*/
public void enableErasureCodingPolicy(String ecPolicyName)
throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.ENABLE_EC_POLICY);
dfs.enableErasureCodingPolicy(ecPolicyName);
}
/**
* Disable erasure coding policy.
*
* @param ecPolicyName The name of the policy to be disabled.
* @throws IOException
*/
public void disableErasureCodingPolicy(String ecPolicyName)
throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.DISABLE_EC_POLICY);
dfs.disableErasureCodingPolicy(ecPolicyName);
}
/**
* Unset the erasure coding policy from the source path.
*
* @param path The directory to unset the policy
* @throws IOException
*/
public void unsetErasureCodingPolicy(final Path path) throws IOException {
statistics.incrementWriteOps(1);
storageStatistics.incrementOpCounter(OpType.UNSET_EC_POLICY);
Path absF = fixRelativePart(path);
new FileSystemLinkResolver() {
@Override
public Void doCall(final Path p) throws IOException {
dfs.unsetErasureCodingPolicy(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.unsetErasureCodingPolicy(p);
return null;
}
throw new UnsupportedOperationException(
"Cannot unsetErasureCodingPolicy through a symlink to a "
+ "non-DistributedFileSystem: " + path + " -> " + p);
}
}.resolve(this, absF);
}
/**
* Get the root directory of Trash for a path in HDFS.
* 1. File in encryption zone returns /ez1/.Trash/username
* 2. File not in encryption zone, or encountered exception when checking
* the encryption zone of the path, returns /users/username/.Trash
* Caller appends either Current or checkpoint timestamp for trash destination
* @param path the trash root of the path to be determined.
* @return trash root
*/
@Override
public Path getTrashRoot(Path path) {
try {
if ((path == null) || !dfs.isHDFSEncryptionEnabled()) {
return super.getTrashRoot(path);
}
} catch (IOException ioe) {
DFSClient.LOG.warn("Exception while checking whether encryption zone is "
+ "supported", ioe);
}
String parentSrc = path.isRoot()?
path.toUri().getPath():path.getParent().toUri().getPath();
try {
EncryptionZone ez = dfs.getEZForPath(parentSrc);
if ((ez != null)) {
return this.makeQualified(
new Path(new Path(ez.getPath(), FileSystem.TRASH_PREFIX),
dfs.ugi.getShortUserName()));
}
} catch (IOException e) {
DFSClient.LOG.warn("Exception in checking the encryption zone for the " +
"path " + parentSrc + ". " + e.getMessage());
}
return super.getTrashRoot(path);
}
/**
* Get all the trash roots of HDFS for current user or for all the users.
* 1. File deleted from non-encryption zone /user/username/.Trash
* 2. File deleted from encryption zones
* e.g., ez1 rooted at /ez1 has its trash root at /ez1/.Trash/$USER
* @param allUsers return trashRoots of all users if true, used by emptier
* @return trash roots of HDFS
*/
@Override
public Collection getTrashRoots(boolean allUsers) {
List ret = new ArrayList<>();
// Get normal trash roots
ret.addAll(super.getTrashRoots(allUsers));
try {
// Get EZ Trash roots
final RemoteIterator it = dfs.listEncryptionZones();
while (it.hasNext()) {
Path ezTrashRoot = new Path(it.next().getPath(),
FileSystem.TRASH_PREFIX);
if (!exists(ezTrashRoot)) {
continue;
}
if (allUsers) {
for (FileStatus candidate : listStatus(ezTrashRoot)) {
if (exists(candidate.getPath())) {
ret.add(candidate);
}
}
} else {
Path userTrash = new Path(ezTrashRoot, dfs.ugi.getShortUserName());
try {
ret.add(getFileStatus(userTrash));
} catch (FileNotFoundException ignored) {
}
}
}
} catch (IOException e){
DFSClient.LOG.warn("Cannot get all encrypted trash roots", e);
}
return ret;
}
@Override
protected Path fixRelativePart(Path p) {
return super.fixRelativePart(p);
}
Statistics getFsStatistics() {
return statistics;
}
DFSOpsCountStatistics getDFSOpsCountStatistics() {
return storageStatistics;
}
/**
* HdfsDataOutputStreamBuilder provides the HDFS-specific capabilities to
* write file on HDFS.
*/
public static final class HdfsDataOutputStreamBuilder
extends FSDataOutputStreamBuilder<
FSDataOutputStream, HdfsDataOutputStreamBuilder> {
private final DistributedFileSystem dfs;
private InetSocketAddress[] favoredNodes = null;
private String ecPolicyName = null;
/**
* Construct a HdfsDataOutputStream builder for a file.
* @param dfs the {@link DistributedFileSystem} instance.
* @param path the path of the file to create / append.
*/
private HdfsDataOutputStreamBuilder(DistributedFileSystem dfs, Path path) {
super(dfs, path);
this.dfs = dfs;
}
@Override
protected HdfsDataOutputStreamBuilder getThisBuilder() {
return this;
}
private InetSocketAddress[] getFavoredNodes() {
return favoredNodes;
}
/**
* Set favored DataNodes.
* @param nodes the addresses of the favored DataNodes.
*/
public HdfsDataOutputStreamBuilder favoredNodes(
@Nonnull final InetSocketAddress[] nodes) {
Preconditions.checkNotNull(nodes);
favoredNodes = nodes.clone();
return this;
}
/**
* Force closed blocks to disk.
*
* @see CreateFlag for the details.
*/
public HdfsDataOutputStreamBuilder syncBlock() {
getFlags().add(CreateFlag.SYNC_BLOCK);
return this;
}
/**
* Create the block on transient storage if possible.
*
* @see CreateFlag for the details.
*/
public HdfsDataOutputStreamBuilder lazyPersist() {
getFlags().add(CreateFlag.LAZY_PERSIST);
return this;
}
/**
* Append data to a new block instead of the end of the last partial block.
*
* @see CreateFlag for the details.
*/
public HdfsDataOutputStreamBuilder newBlock() {
getFlags().add(CreateFlag.NEW_BLOCK);
return this;
}
/**
* Advise that a block replica NOT be written to the local DataNode.
*
* @see CreateFlag for the details.
*/
public HdfsDataOutputStreamBuilder noLocalWrite() {
getFlags().add(CreateFlag.NO_LOCAL_WRITE);
return this;
}
@VisibleForTesting
String getEcPolicyName() {
return ecPolicyName;
}
/**
* Enforce the file to be a striped file with erasure coding policy
* 'policyName', no matter what its parent directory's replication
* or erasure coding policy is. Don't call this function and
* enforceReplicate() in the same builder since they have conflict
* of interest.
*/
public HdfsDataOutputStreamBuilder ecPolicyName(
@Nonnull final String policyName) {
Preconditions.checkNotNull(policyName);
ecPolicyName = policyName;
return this;
}
@VisibleForTesting
boolean shouldReplicate() {
return getFlags().contains(CreateFlag.SHOULD_REPLICATE);
}
/**
* Enforce the file to be a replicated file, no matter what its parent
* directory's replication or erasure coding policy is. Don't call this
* function and setEcPolicyName() in the same builder since they have
* conflict of interest.
*/
public HdfsDataOutputStreamBuilder replicate() {
getFlags().add(CreateFlag.SHOULD_REPLICATE);
return this;
}
/**
* Advise that the first block replica be written without regard to the
* client locality.
*
* @see CreateFlag for the details.
*/
public HdfsDataOutputStreamBuilder ignoreClientLocality() {
getFlags().add(CreateFlag.IGNORE_CLIENT_LOCALITY);
return this;
}
@VisibleForTesting
@Override
protected EnumSet getFlags() {
return super.getFlags();
}
/**
* Build HdfsDataOutputStream to write.
*
* @return a fully-initialized OutputStream.
* @throws IOException on I/O errors.
*/
@Override
public FSDataOutputStream build() throws IOException {
if (getFlags().contains(CreateFlag.CREATE) ||
getFlags().contains(CreateFlag.OVERWRITE)) {
if (isRecursive()) {
return dfs.create(getPath(), getPermission(), getFlags(),
getBufferSize(), getReplication(), getBlockSize(),
getProgress(), getChecksumOpt(), getFavoredNodes(),
getEcPolicyName());
} else {
return dfs.createNonRecursive(getPath(), getPermission(), getFlags(),
getBufferSize(), getReplication(), getBlockSize(), getProgress(),
getChecksumOpt(), getFavoredNodes(), getEcPolicyName());
}
} else if (getFlags().contains(CreateFlag.APPEND)) {
return dfs.append(getPath(), getFlags(), getBufferSize(), getProgress(),
getFavoredNodes());
}
throw new HadoopIllegalArgumentException(
"Must specify either create or append");
}
}
/**
* Create a HdfsDataOutputStreamBuilder to create a file on DFS.
* Similar to {@link #create(Path)}, file is overwritten by default.
*
* @param path the path of the file to create.
* @return A HdfsDataOutputStreamBuilder for creating a file.
*/
@Override
public HdfsDataOutputStreamBuilder createFile(Path path) {
return new HdfsDataOutputStreamBuilder(this, path).create().overwrite(true);
}
/**
* Returns a RemoteIterator which can be used to list all open files
* currently managed by the NameNode. For large numbers of open files,
* iterator will fetch the list in batches of configured size.
*
* Since the list is fetched in batches, it does not represent a
* consistent snapshot of the all open files.
*
* This method can only be called by HDFS superusers.
*/
@Deprecated
public RemoteIterator listOpenFiles() throws IOException {
return dfs.listOpenFiles();
}
public RemoteIterator listOpenFiles(
EnumSet openFilesTypes, String path) throws IOException {
return dfs.listOpenFiles(openFilesTypes, path);
}
/**
* Create a {@link HdfsDataOutputStreamBuilder} to append a file on DFS.
*
* @param path file path.
* @return A {@link HdfsDataOutputStreamBuilder} for appending a file.
*/
@Override
public HdfsDataOutputStreamBuilder appendFile(Path path) {
return new HdfsDataOutputStreamBuilder(this, path).append();
}
}
