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Common functionality for HBase
/*
* 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.hbase.util;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.LocatedFileStatus;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathFilter;
import org.apache.hadoop.fs.RemoteIterator;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.TableName;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hbase.thirdparty.com.google.common.collect.Lists;
/**
* Utility methods for interacting with the underlying file system.
*
* Note that {@link #setStoragePolicy(FileSystem, Path, String)} is tested in TestFSUtils and
* pre-commit will run the hbase-server tests if there's code change in this class. See
* HBASE-20838 for more details.
*/
@InterfaceAudience.Private
public final class CommonFSUtils {
private static final Logger LOG = LoggerFactory.getLogger(CommonFSUtils.class);
/** Parameter name for HBase WAL directory */
public static final String HBASE_WAL_DIR = "hbase.wal.dir";
/** Parameter to disable stream capability enforcement checks */
public static final String UNSAFE_STREAM_CAPABILITY_ENFORCE =
"hbase.unsafe.stream.capability.enforce";
/** Full access permissions (starting point for a umask) */
public static final String FULL_RWX_PERMISSIONS = "777";
private CommonFSUtils() {
}
/**
* Compare of path component. Does not consider schema; i.e. if schemas different but
* path starts with rootPath, then the function returns true
* @param rootPath value to check for
* @param path subject to check
* @return True if path starts with rootPath
*/
public static boolean isStartingWithPath(final Path rootPath, final String path) {
String uriRootPath = rootPath.toUri().getPath();
String tailUriPath = new Path(path).toUri().getPath();
return tailUriPath.startsWith(uriRootPath);
}
/**
* Compare path component of the Path URI; e.g. if hdfs://a/b/c and /a/b/c, it will compare the
* '/a/b/c' part. Does not consider schema; i.e. if schemas different but path or subpath matches,
* the two will equate.
* @param pathToSearch Path we will be trying to match against.
* @param pathTail what to match
* @return True if pathTail is tail on the path of pathToSearch
*/
public static boolean isMatchingTail(final Path pathToSearch, String pathTail) {
return isMatchingTail(pathToSearch, new Path(pathTail));
}
/**
* Compare path component of the Path URI; e.g. if hdfs://a/b/c and /a/b/c, it will compare the
* '/a/b/c' part. If you passed in 'hdfs://a/b/c and b/c, it would return true. Does not consider
* schema; i.e. if schemas different but path or subpath matches, the two will equate.
* @param pathToSearch Path we will be trying to match agains against
* @param pathTail what to match
* @return True if pathTail is tail on the path of pathToSearch
*/
public static boolean isMatchingTail(final Path pathToSearch, final Path pathTail) {
if (pathToSearch.depth() != pathTail.depth()) {
return false;
}
Path tailPath = pathTail;
String tailName;
Path toSearch = pathToSearch;
String toSearchName;
boolean result = false;
do {
tailName = tailPath.getName();
if (tailName == null || tailName.length() <= 0) {
result = true;
break;
}
toSearchName = toSearch.getName();
if (toSearchName == null || toSearchName.length() <= 0) {
break;
}
// Move up a parent on each path for next go around. Path doesn't let us go off the end.
tailPath = tailPath.getParent();
toSearch = toSearch.getParent();
} while (tailName.equals(toSearchName));
return result;
}
/**
* Delete if exists.
* @param fs filesystem object
* @param dir directory to delete
* @return True if deleted dir
* @throws IOException e
*/
public static boolean deleteDirectory(final FileSystem fs, final Path dir) throws IOException {
return fs.exists(dir) && fs.delete(dir, true);
}
/**
* Return the number of bytes that large input files should be optimally be split into to minimize
* i/o time.
* @param fs filesystem object
* @return the default block size for the path's filesystem
*/
public static long getDefaultBlockSize(final FileSystem fs, final Path path) {
return fs.getDefaultBlockSize(path);
}
/*
* Get the default replication.
* @param fs filesystem object
* @param f path of file
* @return default replication for the path's filesystem
*/
public static short getDefaultReplication(final FileSystem fs, final Path path) {
return fs.getDefaultReplication(path);
}
/**
* Returns the default buffer size to use during writes. The size of the buffer should probably be
* a multiple of hardware page size (4096 on Intel x86), and it determines how much data is
* buffered during read and write operations.
* @param fs filesystem object
* @return default buffer size to use during writes
*/
public static int getDefaultBufferSize(final FileSystem fs) {
return fs.getConf().getInt("io.file.buffer.size", 4096);
}
/**
* Create the specified file on the filesystem. By default, this will:
*
* - apply the umask in the configuration (if it is enabled)
* - use the fs configured buffer size (or 4096 if not set)
* - use the default replication
* - use the default block size
* - not track progress
*
* @param fs {@link FileSystem} on which to write the file
* @param path {@link Path} to the file to write
* @param perm intial permissions
* @param overwrite Whether or not the created file should be overwritten.
* @return output stream to the created file
* @throws IOException if the file cannot be created
*/
public static FSDataOutputStream create(FileSystem fs, Path path, FsPermission perm,
boolean overwrite) throws IOException {
if (LOG.isTraceEnabled()) {
LOG.trace("Creating file={} with permission={}, overwrite={}", path, perm, overwrite);
}
return fs.create(path, perm, overwrite, getDefaultBufferSize(fs),
getDefaultReplication(fs, path), getDefaultBlockSize(fs, path), null);
}
/**
* Get the file permissions specified in the configuration, if they are enabled.
* @param fs filesystem that the file will be created on.
* @param conf configuration to read for determining if permissions are enabled and
* which to use
* @param permssionConfKey property key in the configuration to use when finding the permission
* @return the permission to use when creating a new file on the fs. If special permissions are
* not specified in the configuration, then the default permissions on the the fs will be
* returned.
*/
public static FsPermission getFilePermissions(final FileSystem fs, final Configuration conf,
final String permssionConfKey) {
boolean enablePermissions = conf.getBoolean(HConstants.ENABLE_DATA_FILE_UMASK, false);
if (enablePermissions) {
try {
FsPermission perm = new FsPermission(FULL_RWX_PERMISSIONS);
// make sure that we have a mask, if not, go default.
String mask = conf.get(permssionConfKey);
if (mask == null) {
return FsPermission.getFileDefault();
}
// appy the umask
FsPermission umask = new FsPermission(mask);
return perm.applyUMask(umask);
} catch (IllegalArgumentException e) {
LOG.warn("Incorrect umask attempted to be created: " + conf.get(permssionConfKey)
+ ", using default file permissions.", e);
return FsPermission.getFileDefault();
}
}
return FsPermission.getFileDefault();
}
/**
* Verifies root directory path is a valid URI with a scheme
* @param root root directory path
* @return Passed root argument.
* @throws IOException if not a valid URI with a scheme
*/
public static Path validateRootPath(Path root) throws IOException {
try {
URI rootURI = new URI(root.toString());
String scheme = rootURI.getScheme();
if (scheme == null) {
throw new IOException("Root directory does not have a scheme");
}
return root;
} catch (URISyntaxException e) {
throw new IOException("Root directory path is not a valid " + "URI -- check your "
+ HConstants.HBASE_DIR + " configuration", e);
}
}
/**
* Checks for the presence of the WAL log root path (using the provided conf object) in the given
* path. If it exists, this method removes it and returns the String representation of remaining
* relative path.
* @param path must not be null
* @param conf must not be null
* @return String representation of the remaining relative path
* @throws IOException from underlying filesystem
*/
public static String removeWALRootPath(Path path, final Configuration conf) throws IOException {
Path root = getWALRootDir(conf);
String pathStr = path.toString();
// check that the path is absolute... it has the root path in it.
if (!pathStr.startsWith(root.toString())) {
return pathStr;
}
// if not, return as it is.
return pathStr.substring(root.toString().length() + 1);// remove the "/" too.
}
/**
* Return the 'path' component of a Path. In Hadoop, Path is a URI. This method returns the 'path'
* component of a Path's URI: e.g. If a Path is
* hdfs://example.org:9000/hbase_trunk/TestTable/compaction.dir, this method returns
* /hbase_trunk/TestTable/compaction.dir. This method is useful if you want to print
* out a Path without qualifying Filesystem instance.
* @param p Filesystem Path whose 'path' component we are to return.
* @return Path portion of the Filesystem
*/
public static String getPath(Path p) {
return p.toUri().getPath();
}
/**
* Get the path for the root data directory
* @param c configuration
* @return {@link Path} to hbase root directory from configuration as a qualified Path.
* @throws IOException e
*/
public static Path getRootDir(final Configuration c) throws IOException {
Path p = new Path(c.get(HConstants.HBASE_DIR));
FileSystem fs = p.getFileSystem(c);
return p.makeQualified(fs.getUri(), fs.getWorkingDirectory());
}
public static void setRootDir(final Configuration c, final Path root) {
c.set(HConstants.HBASE_DIR, root.toString());
}
public static void setFsDefault(final Configuration c, final Path root) {
c.set("fs.defaultFS", root.toString()); // for hadoop 0.21+
}
public static void setFsDefault(final Configuration c, final String uri) {
c.set("fs.defaultFS", uri); // for hadoop 0.21+
}
public static FileSystem getRootDirFileSystem(final Configuration c) throws IOException {
Path p = getRootDir(c);
return p.getFileSystem(c);
}
/**
* Get the path for the root directory for WAL data
* @param c configuration
* @return {@link Path} to hbase log root directory: e.g. {@value HBASE_WAL_DIR} from
* configuration as a qualified Path. Defaults to HBase root dir.
* @throws IOException e
*/
public static Path getWALRootDir(final Configuration c) throws IOException {
Path p = new Path(c.get(HBASE_WAL_DIR, c.get(HConstants.HBASE_DIR)));
if (!isValidWALRootDir(p, c)) {
return getRootDir(c);
}
FileSystem fs = p.getFileSystem(c);
return p.makeQualified(fs.getUri(), fs.getWorkingDirectory());
}
/**
* Returns the URI in the string format
* @param c configuration
* @param p path
* @return - the URI's to string format
*/
public static String getDirUri(final Configuration c, Path p) throws IOException {
if (p.toUri().getScheme() != null) {
return p.toUri().toString();
}
return null;
}
public static void setWALRootDir(final Configuration c, final Path root) {
c.set(HBASE_WAL_DIR, root.toString());
}
public static FileSystem getWALFileSystem(final Configuration c) throws IOException {
Path p = getWALRootDir(c);
FileSystem fs = p.getFileSystem(c);
// hadoop-core does fs caching, so need to propagate this if set
String enforceStreamCapability = c.get(UNSAFE_STREAM_CAPABILITY_ENFORCE);
if (enforceStreamCapability != null) {
fs.getConf().set(UNSAFE_STREAM_CAPABILITY_ENFORCE, enforceStreamCapability);
}
return fs;
}
private static boolean isValidWALRootDir(Path walDir, final Configuration c) throws IOException {
Path rootDir = getRootDir(c);
FileSystem fs = walDir.getFileSystem(c);
Path qualifiedWalDir = walDir.makeQualified(fs.getUri(), fs.getWorkingDirectory());
if (!qualifiedWalDir.equals(rootDir)) {
if (qualifiedWalDir.toString().startsWith(rootDir.toString() + "/")) {
throw new IllegalStateException("Illegal WAL directory specified. "
+ "WAL directories are not permitted to be under root directory: rootDir="
+ rootDir.toString() + ", qualifiedWALDir=" + qualifiedWalDir);
}
}
return true;
}
/**
* Returns the WAL region directory based on the given table name and region name
* @param conf configuration to determine WALRootDir
* @param tableName Table that the region is under
* @param encodedRegionName Region name used for creating the final region directory
* @return the region directory used to store WALs under the WALRootDir
* @throws IOException if there is an exception determining the WALRootDir
*/
public static Path getWALRegionDir(final Configuration conf, final TableName tableName,
final String encodedRegionName) throws IOException {
return new Path(getWALTableDir(conf, tableName), encodedRegionName);
}
/**
* Returns the Table directory under the WALRootDir for the specified table name
* @param conf configuration used to get the WALRootDir
* @param tableName Table to get the directory for
* @return a path to the WAL table directory for the specified table
* @throws IOException if there is an exception determining the WALRootDir
*/
public static Path getWALTableDir(final Configuration conf, final TableName tableName)
throws IOException {
Path baseDir = new Path(getWALRootDir(conf), HConstants.BASE_NAMESPACE_DIR);
return new Path(new Path(baseDir, tableName.getNamespaceAsString()),
tableName.getQualifierAsString());
}
/**
* For backward compatibility with HBASE-20734, where we store recovered edits in a wrong
* directory without BASE_NAMESPACE_DIR. See HBASE-22617 for more details.
* @deprecated For compatibility, will be removed in 4.0.0.
*/
@Deprecated
public static Path getWrongWALRegionDir(final Configuration conf, final TableName tableName,
final String encodedRegionName) throws IOException {
Path wrongTableDir = new Path(new Path(getWALRootDir(conf), tableName.getNamespaceAsString()),
tableName.getQualifierAsString());
return new Path(wrongTableDir, encodedRegionName);
}
/**
* Returns the {@link org.apache.hadoop.fs.Path} object representing the table directory under
* path rootdir
* @param rootdir qualified path of HBase root directory
* @param tableName name of table
* @return {@link org.apache.hadoop.fs.Path} for table
*/
public static Path getTableDir(Path rootdir, final TableName tableName) {
return new Path(getNamespaceDir(rootdir, tableName.getNamespaceAsString()),
tableName.getQualifierAsString());
}
/**
* Returns the {@link org.apache.hadoop.fs.Path} object representing the region directory under
* path rootdir
* @param rootdir qualified path of HBase root directory
* @param tableName name of table
* @param regionName The encoded region name
* @return {@link org.apache.hadoop.fs.Path} for region
*/
public static Path getRegionDir(Path rootdir, TableName tableName, String regionName) {
return new Path(getTableDir(rootdir, tableName), regionName);
}
/**
* Returns the {@link org.apache.hadoop.hbase.TableName} object representing the table directory
* under path rootdir
* @param tablePath path of table
* @return {@link org.apache.hadoop.fs.Path} for table
*/
public static TableName getTableName(Path tablePath) {
return TableName.valueOf(tablePath.getParent().getName(), tablePath.getName());
}
/**
* Returns the {@link org.apache.hadoop.fs.Path} object representing the namespace directory under
* path rootdir
* @param rootdir qualified path of HBase root directory
* @param namespace namespace name
* @return {@link org.apache.hadoop.fs.Path} for table
*/
public static Path getNamespaceDir(Path rootdir, final String namespace) {
return new Path(rootdir, new Path(HConstants.BASE_NAMESPACE_DIR, new Path(namespace)));
}
// this mapping means that under a federated FileSystem implementation, we'll
// only log the first failure from any of the underlying FileSystems at WARN and all others
// will be at DEBUG.
private static final Map warningMap = new ConcurrentHashMap<>();
/**
* Sets storage policy for given path. If the passed path is a directory, we'll set the storage
* policy for all files created in the future in said directory. Note that this change in storage
* policy takes place at the FileSystem level; it will persist beyond this RS's lifecycle. If
* we're running on a version of FileSystem that doesn't support the given storage policy (or
* storage policies at all), then we'll issue a log message and continue. See
* http://hadoop.apache.org/docs/r2.6.0/hadoop-project-dist/hadoop-hdfs/ArchivalStorage.html
* @param fs We only do anything it implements a setStoragePolicy method
* @param path the Path whose storage policy is to be set
* @param storagePolicy Policy to set on path; see hadoop 2.6+
* org.apache.hadoop.hdfs.protocol.HdfsConstants for possible list e.g
* 'COLD', 'WARM', 'HOT', 'ONE_SSD', 'ALL_SSD', 'LAZY_PERSIST'.
*/
public static void setStoragePolicy(final FileSystem fs, final Path path,
final String storagePolicy) {
try {
setStoragePolicy(fs, path, storagePolicy, false);
} catch (IOException e) {
// should never arrive here
LOG.warn("We have chosen not to throw exception but some unexpectedly thrown out", e);
}
}
static void setStoragePolicy(final FileSystem fs, final Path path, final String storagePolicy,
boolean throwException) throws IOException {
if (storagePolicy == null) {
if (LOG.isTraceEnabled()) {
LOG.trace("We were passed a null storagePolicy, exiting early.");
}
return;
}
String trimmedStoragePolicy = storagePolicy.trim();
if (trimmedStoragePolicy.isEmpty()) {
LOG.trace("We were passed an empty storagePolicy, exiting early.");
return;
} else {
trimmedStoragePolicy = trimmedStoragePolicy.toUpperCase(Locale.ROOT);
}
if (trimmedStoragePolicy.equals(HConstants.DEFER_TO_HDFS_STORAGE_POLICY)) {
LOG.trace("We were passed the defer-to-hdfs policy {}, exiting early.", trimmedStoragePolicy);
return;
}
try {
invokeSetStoragePolicy(fs, path, trimmedStoragePolicy);
} catch (IOException e) {
LOG.trace("Failed to invoke set storage policy API on FS", e);
if (throwException) {
throw e;
}
}
}
/*
* All args have been checked and are good. Run the setStoragePolicy invocation.
*/
private static void invokeSetStoragePolicy(final FileSystem fs, final Path path,
final String storagePolicy) throws IOException {
Exception toThrow = null;
try {
fs.setStoragePolicy(path, storagePolicy);
LOG.debug("Set storagePolicy={} for path={}", storagePolicy, path);
} catch (Exception e) {
toThrow = e;
// This swallows FNFE, should we be throwing it? seems more likely to indicate dev
// misuse than a runtime problem with HDFS.
if (!warningMap.containsKey(fs)) {
warningMap.put(fs, true);
LOG.warn("Unable to set storagePolicy=" + storagePolicy + " for path=" + path + ". "
+ "DEBUG log level might have more details.", e);
} else if (LOG.isDebugEnabled()) {
LOG.debug("Unable to set storagePolicy=" + storagePolicy + " for path=" + path, e);
}
// Hadoop 2.8+, 3.0-a1+ added FileSystem.setStoragePolicy with a default implementation
// that throws UnsupportedOperationException
if (e instanceof UnsupportedOperationException) {
if (LOG.isDebugEnabled()) {
LOG.debug("The underlying FileSystem implementation doesn't support "
+ "setStoragePolicy. This is probably intentional on their part, since HDFS-9345 "
+ "appears to be present in your version of Hadoop. For more information check "
+ "the Hadoop documentation on 'ArchivalStorage', the Hadoop FileSystem "
+ "specification docs from HADOOP-11981, and/or related documentation from the "
+ "provider of the underlying FileSystem (its name should appear in the "
+ "stacktrace that accompanies this message). Note in particular that Hadoop's "
+ "local filesystem implementation doesn't support storage policies.", e);
}
}
}
if (toThrow != null) {
throw new IOException(toThrow);
}
}
/**
* Return true if this is a filesystem whose scheme is 'hdfs'.
* @throws IOException from underlying FileSystem
*/
public static boolean isHDFS(final Configuration conf) throws IOException {
FileSystem fs = FileSystem.get(conf);
String scheme = fs.getUri().getScheme();
return scheme.equalsIgnoreCase("hdfs");
}
/**
* Checks if the given path is the one with 'recovered.edits' dir.
* @param path must not be null
* @return True if we recovered edits
*/
public static boolean isRecoveredEdits(Path path) {
return path.toString().contains(HConstants.RECOVERED_EDITS_DIR);
}
/**
* Returns the filesystem of the hbase rootdir.
* @throws IOException from underlying FileSystem
*/
public static FileSystem getCurrentFileSystem(Configuration conf) throws IOException {
return getRootDir(conf).getFileSystem(conf);
}
/**
* Calls fs.listStatus() and treats FileNotFoundException as non-fatal This accommodates
* differences between hadoop versions, where hadoop 1 does not throw a FileNotFoundException, and
* return an empty FileStatus[] while Hadoop 2 will throw FileNotFoundException. Where possible,
* prefer FSUtils#listStatusWithStatusFilter(FileSystem, Path, FileStatusFilter) instead.
* @param fs file system
* @param dir directory
* @param filter path filter
* @return null if dir is empty or doesn't exist, otherwise FileStatus array
*/
public static FileStatus[] listStatus(final FileSystem fs, final Path dir,
final PathFilter filter) throws IOException {
FileStatus[] status = null;
try {
status = filter == null ? fs.listStatus(dir) : fs.listStatus(dir, filter);
} catch (FileNotFoundException fnfe) {
// if directory doesn't exist, return null
if (LOG.isTraceEnabled()) {
LOG.trace("{} doesn't exist", dir);
}
}
if (status == null || status.length < 1) {
return null;
}
return status;
}
/**
* Calls fs.listStatus() and treats FileNotFoundException as non-fatal This would accommodates
* differences between hadoop versions
* @param fs file system
* @param dir directory
* @return null if dir is empty or doesn't exist, otherwise FileStatus array
*/
public static FileStatus[] listStatus(final FileSystem fs, final Path dir) throws IOException {
return listStatus(fs, dir, null);
}
/**
* Calls fs.listFiles() to get FileStatus and BlockLocations together for reducing rpc call
* @param fs file system
* @param dir directory
* @return LocatedFileStatus list
*/
public static List listLocatedStatus(final FileSystem fs, final Path dir)
throws IOException {
List status = null;
try {
RemoteIterator locatedFileStatusRemoteIterator = fs.listFiles(dir, false);
while (locatedFileStatusRemoteIterator.hasNext()) {
if (status == null) {
status = Lists.newArrayList();
}
status.add(locatedFileStatusRemoteIterator.next());
}
} catch (FileNotFoundException fnfe) {
// if directory doesn't exist, return null
if (LOG.isTraceEnabled()) {
LOG.trace("{} doesn't exist", dir);
}
}
return status;
}
/**
* Calls fs.delete() and returns the value returned by the fs.delete()
* @param fs must not be null
* @param path must not be null
* @param recursive delete tree rooted at path
* @return the value returned by the fs.delete()
* @throws IOException from underlying FileSystem
*/
public static boolean delete(final FileSystem fs, final Path path, final boolean recursive)
throws IOException {
return fs.delete(path, recursive);
}
/**
* Calls fs.exists(). Checks if the specified path exists
* @param fs must not be null
* @param path must not be null
* @return the value returned by fs.exists()
* @throws IOException from underlying FileSystem
*/
public static boolean isExists(final FileSystem fs, final Path path) throws IOException {
return fs.exists(path);
}
/**
* Log the current state of the filesystem from a certain root directory
* @param fs filesystem to investigate
* @param root root file/directory to start logging from
* @param log log to output information
* @throws IOException if an unexpected exception occurs
*/
public static void logFileSystemState(final FileSystem fs, final Path root, Logger log)
throws IOException {
log.debug("File system contents for path {}", root);
logFSTree(log, fs, root, "|-");
}
/**
* Recursive helper to log the state of the FS
* @see #logFileSystemState(FileSystem, Path, Logger)
*/
private static void logFSTree(Logger log, final FileSystem fs, final Path root, String prefix)
throws IOException {
FileStatus[] files = listStatus(fs, root, null);
if (files == null) {
return;
}
for (FileStatus file : files) {
if (file.isDirectory()) {
log.debug(prefix + file.getPath().getName() + "/");
logFSTree(log, fs, file.getPath(), prefix + "---");
} else {
log.debug(prefix + file.getPath().getName());
}
}
}
public static boolean renameAndSetModifyTime(final FileSystem fs, final Path src, final Path dest)
throws IOException {
// set the modify time for TimeToLive Cleaner
fs.setTimes(src, EnvironmentEdgeManager.currentTime(), -1);
return fs.rename(src, dest);
}
/**
* Check if short circuit read buffer size is set and if not, set it to hbase value.
* @param conf must not be null
*/
public static void checkShortCircuitReadBufferSize(final Configuration conf) {
final int defaultSize = HConstants.DEFAULT_BLOCKSIZE * 2;
final int notSet = -1;
// DFSConfigKeys.DFS_CLIENT_READ_SHORTCIRCUIT_BUFFER_SIZE_KEY is only defined in h2
final String dfsKey = "dfs.client.read.shortcircuit.buffer.size";
int size = conf.getInt(dfsKey, notSet);
// If a size is set, return -- we will use it.
if (size != notSet) {
return;
}
// But short circuit buffer size is normally not set. Put in place the hbase wanted size.
int hbaseSize = conf.getInt("hbase." + dfsKey, defaultSize);
conf.setIfUnset(dfsKey, Integer.toString(hbaseSize));
}
/**
* Helper exception for those cases where the place where we need to check a stream capability is
* not where we have the needed context to explain the impact and mitigation for a lack.
*/
public static class StreamLacksCapabilityException extends Exception {
public StreamLacksCapabilityException(String message, Throwable cause) {
super(message, cause);
}
public StreamLacksCapabilityException(String message) {
super(message);
}
}
}