/**
* Copyright 2010 The Apache Software Foundation
*
* 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.DataInputStream;
import java.io.EOFException;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.BlockLocation;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathFilter;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HDFSBlocksDistribution;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.RemoteExceptionHandler;
import org.apache.hadoop.hbase.master.HMaster;
import org.apache.hadoop.hbase.regionserver.HRegion;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.io.SequenceFile;
import org.apache.hadoop.util.ReflectionUtils;
import org.apache.hadoop.util.StringUtils;
/**
* Utility methods for interacting with the underlying file system.
*/
public abstract class FSUtils {
private static final Log LOG = LogFactory.getLog(FSUtils.class);
protected FSUtils() {
super();
}
public static FSUtils getInstance(FileSystem fs, Configuration conf) {
String scheme = fs.getUri().getScheme();
if (scheme == null) {
LOG.warn("Could not find scheme for uri " +
fs.getUri() + ", default to hdfs");
scheme = "hdfs";
}
Class<?> fsUtilsClass = conf.getClass("hbase.fsutil." +
scheme + ".impl", FSHDFSUtils.class); // Default to HDFS impl
FSUtils fsUtils = (FSUtils)ReflectionUtils.newInstance(fsUtilsClass, conf);
return fsUtils;
}
/**
* Delete if exists.
* @param fs filesystem object
* @param dir directory to delete
* @return True if deleted <code>dir</code>
* @throws IOException e
*/
public static boolean deleteDirectory(final FileSystem fs, final Path dir)
throws IOException {
return fs.exists(dir) && fs.delete(dir, true);
}
/**
* Check if directory exists. If it does not, create it.
* @param fs filesystem object
* @param dir path to check
* @return Path
* @throws IOException e
*/
public Path checkdir(final FileSystem fs, final Path dir) throws IOException {
if (!fs.exists(dir)) {
fs.mkdirs(dir);
}
return dir;
}
/**
* Create file.
* @param fs filesystem object
* @param p path to create
* @return Path
* @throws IOException e
*/
public static Path create(final FileSystem fs, final Path p)
throws IOException {
if (fs.exists(p)) {
throw new IOException("File already exists " + p.toString());
}
if (!fs.createNewFile(p)) {
throw new IOException("Failed create of " + p);
}
return p;
}
/**
* Checks to see if the specified file system is available
*
* @param fs filesystem
* @throws IOException e
*/
public static void checkFileSystemAvailable(final FileSystem fs)
throws IOException {
if (!(fs instanceof DistributedFileSystem)) {
return;
}
IOException exception = null;
DistributedFileSystem dfs = (DistributedFileSystem) fs;
try {
if (dfs.exists(new Path("/"))) {
return;
}
} catch (IOException e) {
exception = RemoteExceptionHandler.checkIOException(e);
}
try {
fs.close();
} catch (Exception e) {
LOG.error("file system close failed: ", e);
}
IOException io = new IOException("File system is not available");
io.initCause(exception);
throw io;
}
/**
* Check whether dfs is in safemode.
* @param conf
* @throws IOException
*/
public static void checkDfsSafeMode(final Configuration conf)
throws IOException {
boolean isInSafeMode = false;
FileSystem fs = FileSystem.get(conf);
if (fs instanceof DistributedFileSystem) {
DistributedFileSystem dfs = (DistributedFileSystem)fs;
// Check whether dfs is on safemode.
isInSafeMode = dfs.setSafeMode(org.apache.hadoop.hdfs.protocol.FSConstants.SafeModeAction.SAFEMODE_GET);
}
if (isInSafeMode) {
throw new IOException("File system is in safemode, it can't be written now");
}
}
/**
* Verifies current version of file system
*
* @param fs filesystem object
* @param rootdir root hbase directory
* @return null if no version file exists, version string otherwise.
* @throws IOException e
*/
public static String getVersion(FileSystem fs, Path rootdir)
throws IOException {
Path versionFile = new Path(rootdir, HConstants.VERSION_FILE_NAME);
String version = null;
if (fs.exists(versionFile)) {
FSDataInputStream s =
fs.open(versionFile);
try {
version = DataInputStream.readUTF(s);
} catch (EOFException eof) {
LOG.warn("Version file was empty, odd, will try to set it.");
} finally {
s.close();
}
}
return version;
}
/**
* Verifies current version of file system
*
* @param fs file system
* @param rootdir root directory of HBase installation
* @param message if true, issues a message on System.out
*
* @throws IOException e
*/
public static void checkVersion(FileSystem fs, Path rootdir,
boolean message) throws IOException {
checkVersion(fs, rootdir, message, 0,
HConstants.DEFAULT_VERSION_FILE_WRITE_ATTEMPTS);
}
/**
* Verifies current version of file system
*
* @param fs file system
* @param rootdir root directory of HBase installation
* @param message if true, issues a message on System.out
* @param wait wait interval
* @param retries number of times to retry
*
* @throws IOException e
*/
public static void checkVersion(FileSystem fs, Path rootdir,
boolean message, int wait, int retries) throws IOException {
String version = getVersion(fs, rootdir);
if (version == null) {
if (!rootRegionExists(fs, rootdir)) {
// rootDir is empty (no version file and no root region)
// just create new version file (HBASE-1195)
FSUtils.setVersion(fs, rootdir, wait, retries);
return;
}
} else if (version.compareTo(HConstants.FILE_SYSTEM_VERSION) == 0)
return;
// version is deprecated require migration
// Output on stdout so user sees it in terminal.
String msg = "File system needs to be upgraded."
+ " You have version " + version
+ " and I want version " + HConstants.FILE_SYSTEM_VERSION
+ ". Run the '${HBASE_HOME}/bin/hbase migrate' script.";
if (message) {
System.out.println("WARNING! " + msg);
}
throw new FileSystemVersionException(msg);
}
/**
* Sets version of file system
*
* @param fs filesystem object
* @param rootdir hbase root
* @throws IOException e
*/
public static void setVersion(FileSystem fs, Path rootdir)
throws IOException {
setVersion(fs, rootdir, HConstants.FILE_SYSTEM_VERSION, 0,
HConstants.DEFAULT_VERSION_FILE_WRITE_ATTEMPTS);
}
/**
* Sets version of file system
*
* @param fs filesystem object
* @param rootdir hbase root
* @param wait time to wait for retry
* @param retries number of times to retry before failing
* @throws IOException e
*/
public static void setVersion(FileSystem fs, Path rootdir, int wait, int retries)
throws IOException {
setVersion(fs, rootdir, HConstants.FILE_SYSTEM_VERSION, wait, retries);
}
/**
* Sets version of file system
*
* @param fs filesystem object
* @param rootdir hbase root directory
* @param version version to set
* @param wait time to wait for retry
* @param retries number of times to retry before throwing an IOException
* @throws IOException e
*/
public static void setVersion(FileSystem fs, Path rootdir, String version,
int wait, int retries) throws IOException {
Path versionFile = new Path(rootdir, HConstants.VERSION_FILE_NAME);
while (true) {
try {
FSDataOutputStream s = fs.create(versionFile);
s.writeUTF(version);
LOG.debug("Created version file at " + rootdir.toString() +
" set its version at:" + version);
s.close();
return;
} catch (IOException e) {
if (retries > 0) {
LOG.warn("Unable to create version file at " + rootdir.toString() +
", retrying: " + e.getMessage());
fs.delete(versionFile, false);
try {
if (wait > 0) {
Thread.sleep(wait);
}
} catch (InterruptedException ex) {
// ignore
}
retries--;
} else {
throw e;
}
}
}
}
/**
* Checks that a cluster ID file exists in the HBase root directory
* @param fs the root directory FileSystem
* @param rootdir the HBase root directory in HDFS
* @param wait how long to wait between retries
* @return <code>true</code> if the file exists, otherwise <code>false</code>
* @throws IOException if checking the FileSystem fails
*/
public static boolean checkClusterIdExists(FileSystem fs, Path rootdir,
int wait) throws IOException {
while (true) {
try {
Path filePath = new Path(rootdir, HConstants.CLUSTER_ID_FILE_NAME);
return fs.exists(filePath);
} catch (IOException ioe) {
if (wait > 0) {
LOG.warn("Unable to check cluster ID file in " + rootdir.toString() +
", retrying in "+wait+"msec: "+StringUtils.stringifyException(ioe));
try {
Thread.sleep(wait);
} catch (InterruptedException ie) {
Thread.interrupted();
break;
}
} else {
throw ioe;
}
}
}
return false;
}
/**
* Returns the value of the unique cluster ID stored for this HBase instance.
* @param fs the root directory FileSystem
* @param rootdir the path to the HBase root directory
* @return the unique cluster identifier
* @throws IOException if reading the cluster ID file fails
*/
public static String getClusterId(FileSystem fs, Path rootdir)
throws IOException {
Path idPath = new Path(rootdir, HConstants.CLUSTER_ID_FILE_NAME);
String clusterId = null;
if (fs.exists(idPath)) {
FSDataInputStream in = fs.open(idPath);
try {
clusterId = in.readUTF();
} catch (EOFException eof) {
LOG.warn("Cluster ID file "+idPath.toString()+" was empty");
} finally{
in.close();
}
} else {
LOG.warn("Cluster ID file does not exist at " + idPath.toString());
}
return clusterId;
}
/**
* Writes a new unique identifier for this cluster to the "hbase.id" file
* in the HBase root directory
* @param fs the root directory FileSystem
* @param rootdir the path to the HBase root directory
* @param clusterId the unique identifier to store
* @param wait how long (in milliseconds) to wait between retries
* @throws IOException if writing to the FileSystem fails and no wait value
*/
public static void setClusterId(FileSystem fs, Path rootdir, String clusterId,
int wait) throws IOException {
while (true) {
try {
Path filePath = new Path(rootdir, HConstants.CLUSTER_ID_FILE_NAME);
FSDataOutputStream s = fs.create(filePath);
s.writeUTF(clusterId);
s.close();
if (LOG.isDebugEnabled()) {
LOG.debug("Created cluster ID file at " + filePath.toString() +
" with ID: " + clusterId);
}
return;
} catch (IOException ioe) {
if (wait > 0) {
LOG.warn("Unable to create cluster ID file in " + rootdir.toString() +
", retrying in "+wait+"msec: "+StringUtils.stringifyException(ioe));
try {
Thread.sleep(wait);
} catch (InterruptedException ie) {
Thread.interrupted();
break;
}
} else {
throw ioe;
}
}
}
}
/**
* Verifies root directory path is a valid URI with a scheme
*
* @param root root directory path
* @return Passed <code>root</code> 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) {
IOException io = new IOException("Root directory path is not a valid " +
"URI -- check your " + HConstants.HBASE_DIR + " configuration");
io.initCause(e);
throw io;
}
}
/**
* If DFS, check safe mode and if so, wait until we clear it.
* @param conf configuration
* @param wait Sleep between retries
* @throws IOException e
*/
public static void waitOnSafeMode(final Configuration conf,
final long wait)
throws IOException {
FileSystem fs = FileSystem.get(conf);
if (!(fs instanceof DistributedFileSystem)) return;
DistributedFileSystem dfs = (DistributedFileSystem)fs;
// Make sure dfs is not in safe mode
while (dfs.setSafeMode(org.apache.hadoop.hdfs.protocol.FSConstants.SafeModeAction.SAFEMODE_GET)) {
LOG.info("Waiting for dfs to exit safe mode...");
try {
Thread.sleep(wait);
} catch (InterruptedException e) {
//continue
}
}
}
/**
* Return the 'path' component of a Path. In Hadoop, Path is an URI. This
* method returns the 'path' component of a Path's URI: e.g. If a Path is
* <code>hdfs://example.org:9000/hbase_trunk/TestTable/compaction.dir</code>,
* this method returns <code>/hbase_trunk/TestTable/compaction.dir</code>.
* 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();
}
/**
* @param c configuration
* @return Path to hbase root directory: i.e. <code>hbase.rootdir</code> 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);
}
/**
* Checks if root region exists
*
* @param fs file system
* @param rootdir root directory of HBase installation
* @return true if exists
* @throws IOException e
*/
public static boolean rootRegionExists(FileSystem fs, Path rootdir)
throws IOException {
Path rootRegionDir =
HRegion.getRegionDir(rootdir, HRegionInfo.ROOT_REGIONINFO);
return fs.exists(rootRegionDir);
}
/**
* Compute HDFS blocks distribution of a given file, or a portion of the file
* @param fs file system
* @param status file status of the file
* @param start start position of the portion
* @param length length of the portion
* @return The HDFS blocks distribution
*/
static public HDFSBlocksDistribution computeHDFSBlocksDistribution(
final FileSystem fs, FileStatus status, long start, long length)
throws IOException {
HDFSBlocksDistribution blocksDistribution = new HDFSBlocksDistribution();
BlockLocation [] blockLocations =
fs.getFileBlockLocations(status, start, length);
for(BlockLocation bl : blockLocations) {
String [] hosts = bl.getHosts();
long len = bl.getLength();
blocksDistribution.addHostsAndBlockWeight(hosts, len);
}
return blocksDistribution;
}
/**
* Runs through the hbase rootdir and checks all stores have only
* one file in them -- that is, they've been major compacted. Looks
* at root and meta tables too.
* @param fs filesystem
* @param hbaseRootDir hbase root directory
* @return True if this hbase install is major compacted.
* @throws IOException e
*/
public static boolean isMajorCompacted(final FileSystem fs,
final Path hbaseRootDir)
throws IOException {
// Presumes any directory under hbase.rootdir is a table.
FileStatus [] tableDirs = fs.listStatus(hbaseRootDir, new DirFilter(fs));
for (FileStatus tableDir : tableDirs) {
// Skip the .log directory. All others should be tables. Inside a table,
// there are compaction.dir directories to skip. Otherwise, all else
// should be regions. Then in each region, should only be family
// directories. Under each of these, should be one file only.
Path d = tableDir.getPath();
if (d.getName().equals(HConstants.HREGION_LOGDIR_NAME)) {
continue;
}
FileStatus[] regionDirs = fs.listStatus(d, new DirFilter(fs));
for (FileStatus regionDir : regionDirs) {
Path dd = regionDir.getPath();
if (dd.getName().equals(HConstants.HREGION_COMPACTIONDIR_NAME)) {
continue;
}
// Else its a region name. Now look in region for families.
FileStatus[] familyDirs = fs.listStatus(dd, new DirFilter(fs));
for (FileStatus familyDir : familyDirs) {
Path family = familyDir.getPath();
// Now in family make sure only one file.
FileStatus[] familyStatus = fs.listStatus(family);
if (familyStatus.length > 1) {
LOG.debug(family.toString() + " has " + familyStatus.length +
" files.");
return false;
}
}
}
}
return true;
}
// TODO move this method OUT of FSUtils. No dependencies to HMaster
/**
* Returns the total overall fragmentation percentage. Includes .META. and
* -ROOT- as well.
*
* @param master The master defining the HBase root and file system.
* @return A map for each table and its percentage.
* @throws IOException When scanning the directory fails.
*/
public static int getTotalTableFragmentation(final HMaster master)
throws IOException {
Map<String, Integer> map = getTableFragmentation(master);
return map != null && map.size() > 0 ? map.get("-TOTAL-") : -1;
}
/**
* Runs through the HBase rootdir and checks how many stores for each table
* have more than one file in them. Checks -ROOT- and .META. too. The total
* percentage across all tables is stored under the special key "-TOTAL-".
*
* @param master The master defining the HBase root and file system.
* @return A map for each table and its percentage.
* @throws IOException When scanning the directory fails.
*/
public static Map<String, Integer> getTableFragmentation(
final HMaster master)
throws IOException {
Path path = getRootDir(master.getConfiguration());
// since HMaster.getFileSystem() is package private
FileSystem fs = path.getFileSystem(master.getConfiguration());
return getTableFragmentation(fs, path);
}
/**
* Runs through the HBase rootdir and checks how many stores for each table
* have more than one file in them. Checks -ROOT- and .META. too. The total
* percentage across all tables is stored under the special key "-TOTAL-".
*
* @param fs The file system to use.
* @param hbaseRootDir The root directory to scan.
* @return A map for each table and its percentage.
* @throws IOException When scanning the directory fails.
*/
public static Map<String, Integer> getTableFragmentation(
final FileSystem fs, final Path hbaseRootDir)
throws IOException {
Map<String, Integer> frags = new HashMap<String, Integer>();
int cfCountTotal = 0;
int cfFragTotal = 0;
DirFilter df = new DirFilter(fs);
// presumes any directory under hbase.rootdir is a table
FileStatus [] tableDirs = fs.listStatus(hbaseRootDir, df);
for (FileStatus tableDir : tableDirs) {
// Skip the .log directory. All others should be tables. Inside a table,
// there are compaction.dir directories to skip. Otherwise, all else
// should be regions. Then in each region, should only be family
// directories. Under each of these, should be one file only.
Path d = tableDir.getPath();
if (d.getName().equals(HConstants.HREGION_LOGDIR_NAME)) {
continue;
}
int cfCount = 0;
int cfFrag = 0;
FileStatus[] regionDirs = fs.listStatus(d, df);
for (FileStatus regionDir : regionDirs) {
Path dd = regionDir.getPath();
if (dd.getName().equals(HConstants.HREGION_COMPACTIONDIR_NAME)) {
continue;
}
// else its a region name, now look in region for families
FileStatus[] familyDirs = fs.listStatus(dd, df);
for (FileStatus familyDir : familyDirs) {
cfCount++;
cfCountTotal++;
Path family = familyDir.getPath();
// now in family make sure only one file
FileStatus[] familyStatus = fs.listStatus(family);
if (familyStatus.length > 1) {
cfFrag++;
cfFragTotal++;
}
}
}
// compute percentage per table and store in result list
frags.put(d.getName(), Math.round((float) cfFrag / cfCount * 100));
}
// set overall percentage for all tables
frags.put("-TOTAL-", Math.round((float) cfFragTotal / cfCountTotal * 100));
return frags;
}
/**
* Expects to find -ROOT- directory.
* @param fs filesystem
* @param hbaseRootDir hbase root directory
* @return True if this a pre020 layout.
* @throws IOException e
*/
public static boolean isPre020FileLayout(final FileSystem fs,
final Path hbaseRootDir)
throws IOException {
Path mapfiles = new Path(new Path(new Path(new Path(hbaseRootDir, "-ROOT-"),
"70236052"), "info"), "mapfiles");
return fs.exists(mapfiles);
}
/**
* Runs through the hbase rootdir and checks all stores have only
* one file in them -- that is, they've been major compacted. Looks
* at root and meta tables too. This version differs from
* {@link #isMajorCompacted(FileSystem, Path)} in that it expects a
* pre-0.20.0 hbase layout on the filesystem. Used migrating.
* @param fs filesystem
* @param hbaseRootDir hbase root directory
* @return True if this hbase install is major compacted.
* @throws IOException e
*/
public static boolean isMajorCompactedPre020(final FileSystem fs,
final Path hbaseRootDir)
throws IOException {
// Presumes any directory under hbase.rootdir is a table.
FileStatus [] tableDirs = fs.listStatus(hbaseRootDir, new DirFilter(fs));
for (FileStatus tableDir : tableDirs) {
// Inside a table, there are compaction.dir directories to skip.
// Otherwise, all else should be regions. Then in each region, should
// only be family directories. Under each of these, should be a mapfile
// and info directory and in these only one file.
Path d = tableDir.getPath();
if (d.getName().equals(HConstants.HREGION_LOGDIR_NAME)) {
continue;
}
FileStatus[] regionDirs = fs.listStatus(d, new DirFilter(fs));
for (FileStatus regionDir : regionDirs) {
Path dd = regionDir.getPath();
if (dd.getName().equals(HConstants.HREGION_COMPACTIONDIR_NAME)) {
continue;
}
// Else its a region name. Now look in region for families.
FileStatus[] familyDirs = fs.listStatus(dd, new DirFilter(fs));
for (FileStatus familyDir : familyDirs) {
Path family = familyDir.getPath();
FileStatus[] infoAndMapfile = fs.listStatus(family);
// Assert that only info and mapfile in family dir.
if (infoAndMapfile.length != 0 && infoAndMapfile.length != 2) {
LOG.debug(family.toString() +
" has more than just info and mapfile: " + infoAndMapfile.length);
return false;
}
// Make sure directory named info or mapfile.
for (int ll = 0; ll < 2; ll++) {
if (infoAndMapfile[ll].getPath().getName().equals("info") ||
infoAndMapfile[ll].getPath().getName().equals("mapfiles"))
continue;
LOG.debug("Unexpected directory name: " +
infoAndMapfile[ll].getPath());
return false;
}
// Now in family, there are 'mapfile' and 'info' subdirs. Just
// look in the 'mapfile' subdir.
FileStatus[] familyStatus =
fs.listStatus(new Path(family, "mapfiles"));
if (familyStatus.length > 1) {
LOG.debug(family.toString() + " has " + familyStatus.length +
" files.");
return false;
}
}
}
}
return true;
}
/**
* A {@link PathFilter} that returns directories.
*/
public static class DirFilter implements PathFilter {
private final FileSystem fs;
public DirFilter(final FileSystem fs) {
this.fs = fs;
}
public boolean accept(Path p) {
boolean isValid = false;
try {
if (HConstants.HBASE_NON_USER_TABLE_DIRS.contains(p)) {
isValid = false;
} else {
isValid = this.fs.getFileStatus(p).isDir();
}
} catch (IOException e) {
e.printStackTrace();
}
return isValid;
}
}
/**
* Heuristic to determine whether is safe or not to open a file for append
* Looks both for dfs.support.append and use reflection to search
* for SequenceFile.Writer.syncFs() or FSDataOutputStream.hflush()
* @param conf
* @return True if append support
*/
public static boolean isAppendSupported(final Configuration conf) {
boolean append = conf.getBoolean("dfs.support.append", false);
if (append) {
try {
// TODO: The implementation that comes back when we do a createWriter
// may not be using SequenceFile so the below is not a definitive test.
// Will do for now (hdfs-200).
SequenceFile.Writer.class.getMethod("syncFs", new Class<?> []{});
append = true;
} catch (SecurityException e) {
} catch (NoSuchMethodException e) {
append = false;
}
}
if (!append) {
// Look for the 0.21, 0.22, new-style append evidence.
try {
FSDataOutputStream.class.getMethod("hflush", new Class<?> []{});
append = true;
} catch (NoSuchMethodException e) {
append = false;
}
}
return append;
}
/**
* @param conf
* @return True if this filesystem whose scheme is 'hdfs'.
* @throws IOException
*/
public static boolean isHDFS(final Configuration conf) throws IOException {
FileSystem fs = FileSystem.get(conf);
String scheme = fs.getUri().getScheme();
return scheme.equalsIgnoreCase("hdfs");
}
/**
* Recover file lease. Used when a file might be suspect
* to be had been left open by another process.
* @param fs FileSystem handle
* @param p Path of file to recover lease
* @param conf Configuration handle
* @throws IOException
*/
public abstract void recoverFileLease(final FileSystem fs, final Path p,
Configuration conf) throws IOException;
/**
* @param fs
* @param rootdir
* @return All the table directories under <code>rootdir</code>. Ignore non table hbase folders such as
* .logs, .oldlogs, .corrupt, .META., and -ROOT- folders.
* @throws IOException
*/
public static List<Path> getTableDirs(final FileSystem fs, final Path rootdir)
throws IOException {
// presumes any directory under hbase.rootdir is a table
FileStatus [] dirs = fs.listStatus(rootdir, new DirFilter(fs));
List<Path> tabledirs = new ArrayList<Path>(dirs.length);
for (FileStatus dir: dirs) {
Path p = dir.getPath();
String tableName = p.getName();
if (!HConstants.HBASE_NON_USER_TABLE_DIRS.contains(tableName)) {
tabledirs.add(p);
}
}
return tabledirs;
}
public static Path getTablePath(Path rootdir, byte [] tableName) {
return getTablePath(rootdir, Bytes.toString(tableName));
}
public static Path getTablePath(Path rootdir, final String tableName) {
return new Path(rootdir, tableName);
}
/**
* @param conf
* @return Returns the filesystem of the hbase rootdir.
* @throws IOException
*/
public static FileSystem getCurrentFileSystem(Configuration conf)
throws IOException {
return getRootDir(conf).getFileSystem(conf);
}
/**
* Runs through the HBase rootdir and creates a reverse lookup map for
* table StoreFile names to the full Path.
* <br>
* Example...<br>
* Key = 3944417774205889744 <br>
* Value = hdfs://localhost:51169/user/userid/-ROOT-/70236052/info/3944417774205889744
*
* @param fs The file system to use.
* @param hbaseRootDir The root directory to scan.
* @return Map keyed by StoreFile name with a value of the full Path.
* @throws IOException When scanning the directory fails.
*/
public static Map<String, Path> getTableStoreFilePathMap(
final FileSystem fs, final Path hbaseRootDir)
throws IOException {
Map<String, Path> map = new HashMap<String, Path>();
// if this method looks similar to 'getTableFragmentation' that is because
// it was borrowed from it.
DirFilter df = new DirFilter(fs);
// presumes any directory under hbase.rootdir is a table
FileStatus [] tableDirs = fs.listStatus(hbaseRootDir, df);
for (FileStatus tableDir : tableDirs) {
// Skip the .log directory. All others should be tables. Inside a table,
// there are compaction.dir directories to skip. Otherwise, all else
// should be regions.
Path d = tableDir.getPath();
if (d.getName().equals(HConstants.HREGION_LOGDIR_NAME)) {
continue;
}
FileStatus[] regionDirs = fs.listStatus(d, df);
for (FileStatus regionDir : regionDirs) {
Path dd = regionDir.getPath();
if (dd.getName().equals(HConstants.HREGION_COMPACTIONDIR_NAME)) {
continue;
}
// else its a region name, now look in region for families
FileStatus[] familyDirs = fs.listStatus(dd, df);
for (FileStatus familyDir : familyDirs) {
Path family = familyDir.getPath();
// now in family, iterate over the StoreFiles and
// put in map
FileStatus[] familyStatus = fs.listStatus(family);
for (FileStatus sfStatus : familyStatus) {
Path sf = sfStatus.getPath();
map.put( sf.getName(), sf);
}
}
}
}
return map;
}
/**
* Calls fs.listStatus() and treats FileNotFoundException as non-fatal
* This would accommodate difference in various hadoop versions
*
* @param fs file system
* @param dir directory
* @param filter path filter
* @return null if tabledir 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
LOG.info(dir + " doesn't exist");
}
if (status == null || status.length < 1) return null;
return status;
}
}