org.apache.hadoop.hbase.master.MasterFileSystem Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of hbase-server Show documentation
Show all versions of hbase-server Show documentation
Main 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.master;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
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.fs.permission.FsPermission;
import org.apache.hadoop.hbase.ClusterId;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.InvalidFamilyOperationException;
import org.apache.hadoop.hbase.RemoteExceptionHandler;
import org.apache.hadoop.hbase.Server;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.backup.HFileArchiver;
import org.apache.hadoop.hbase.exceptions.DeserializationException;
import org.apache.hadoop.hbase.fs.HFileSystem;
import org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SplitLogTask.RecoveryMode;
import org.apache.hadoop.hbase.regionserver.HRegion;
import org.apache.hadoop.hbase.wal.DefaultWALProvider;
import org.apache.hadoop.hbase.wal.WALSplitter;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
import org.apache.hadoop.hbase.util.FSTableDescriptors;
import org.apache.hadoop.hbase.util.FSUtils;
import com.google.common.annotations.VisibleForTesting;
/**
* This class abstracts a bunch of operations the HMaster needs to interact with
* the underlying file system, including splitting log files, checking file
* system status, etc.
*/
@InterfaceAudience.Private
public class MasterFileSystem {
private static final Log LOG = LogFactory.getLog(MasterFileSystem.class.getName());
// HBase configuration
Configuration conf;
// master status
Server master;
// metrics for master
private final MetricsMasterFileSystem metricsMasterFilesystem = new MetricsMasterFileSystem();
// Persisted unique cluster ID
private ClusterId clusterId;
// Keep around for convenience.
private final FileSystem fs;
// Is the fileystem ok?
private volatile boolean fsOk = true;
// The Path to the old logs dir
private final Path oldLogDir;
// root hbase directory on the FS
private final Path rootdir;
// hbase temp directory used for table construction and deletion
private final Path tempdir;
// create the split log lock
final Lock splitLogLock = new ReentrantLock();
final boolean distributedLogReplay;
final SplitLogManager splitLogManager;
private final MasterServices services;
final static PathFilter META_FILTER = new PathFilter() {
@Override
public boolean accept(Path p) {
return DefaultWALProvider.isMetaFile(p);
}
};
final static PathFilter NON_META_FILTER = new PathFilter() {
@Override
public boolean accept(Path p) {
return !DefaultWALProvider.isMetaFile(p);
}
};
public MasterFileSystem(Server master, MasterServices services)
throws IOException {
this.conf = master.getConfiguration();
this.master = master;
this.services = services;
// Set filesystem to be that of this.rootdir else we get complaints about
// mismatched filesystems if hbase.rootdir is hdfs and fs.defaultFS is
// default localfs. Presumption is that rootdir is fully-qualified before
// we get to here with appropriate fs scheme.
this.rootdir = FSUtils.getRootDir(conf);
this.tempdir = new Path(this.rootdir, HConstants.HBASE_TEMP_DIRECTORY);
// Cover both bases, the old way of setting default fs and the new.
// We're supposed to run on 0.20 and 0.21 anyways.
this.fs = this.rootdir.getFileSystem(conf);
FSUtils.setFsDefault(conf, new Path(this.fs.getUri()));
// make sure the fs has the same conf
fs.setConf(conf);
// setup the filesystem variable
// set up the archived logs path
this.oldLogDir = createInitialFileSystemLayout();
HFileSystem.addLocationsOrderInterceptor(conf);
this.splitLogManager =
new SplitLogManager(master, master.getConfiguration(), master, services,
master.getServerName());
this.distributedLogReplay = this.splitLogManager.isLogReplaying();
}
@VisibleForTesting
SplitLogManager getSplitLogManager() {
return this.splitLogManager;
}
/**
* Create initial layout in filesystem.
*
* - Check if the meta region exists and is readable, if not create it.
* Create hbase.version and the hbase:meta directory if not one.
*
* - Create a log archive directory for RS to put archived logs
*
* Idempotent.
*/
private Path createInitialFileSystemLayout() throws IOException {
// check if the root directory exists
checkRootDir(this.rootdir, conf, this.fs);
// check if temp directory exists and clean it
checkTempDir(this.tempdir, conf, this.fs);
Path oldLogDir = new Path(this.rootdir, HConstants.HREGION_OLDLOGDIR_NAME);
// Make sure the region servers can archive their old logs
if(!this.fs.exists(oldLogDir)) {
this.fs.mkdirs(oldLogDir);
}
return oldLogDir;
}
public FileSystem getFileSystem() {
return this.fs;
}
/**
* Get the directory where old logs go
* @return the dir
*/
public Path getOldLogDir() {
return this.oldLogDir;
}
/**
* Checks to see if the file system is still accessible.
* If not, sets closed
* @return false if file system is not available
*/
public boolean checkFileSystem() {
if (this.fsOk) {
try {
FSUtils.checkFileSystemAvailable(this.fs);
FSUtils.checkDfsSafeMode(this.conf);
} catch (IOException e) {
master.abort("Shutting down HBase cluster: file system not available", e);
this.fsOk = false;
}
}
return this.fsOk;
}
/**
* @return HBase root dir.
*/
public Path getRootDir() {
return this.rootdir;
}
/**
* @return HBase temp dir.
*/
public Path getTempDir() {
return this.tempdir;
}
/**
* @return The unique identifier generated for this cluster
*/
public ClusterId getClusterId() {
return clusterId;
}
/**
* Inspect the log directory to find dead servers which need recovery work
* @return A set of ServerNames which aren't running but still have WAL files left in file system
*/
Set getFailedServersFromLogFolders() {
boolean retrySplitting = !conf.getBoolean("hbase.hlog.split.skip.errors",
WALSplitter.SPLIT_SKIP_ERRORS_DEFAULT);
Set serverNames = new HashSet();
Path logsDirPath = new Path(this.rootdir, HConstants.HREGION_LOGDIR_NAME);
do {
if (master.isStopped()) {
LOG.warn("Master stopped while trying to get failed servers.");
break;
}
try {
if (!this.fs.exists(logsDirPath)) return serverNames;
FileStatus[] logFolders = FSUtils.listStatus(this.fs, logsDirPath, null);
// Get online servers after getting log folders to avoid log folder deletion of newly
// checked in region servers . see HBASE-5916
Set onlineServers = ((HMaster) master).getServerManager().getOnlineServers()
.keySet();
if (logFolders == null || logFolders.length == 0) {
LOG.debug("No log files to split, proceeding...");
return serverNames;
}
for (FileStatus status : logFolders) {
FileStatus[] curLogFiles = FSUtils.listStatus(this.fs, status.getPath(), null);
if (curLogFiles == null || curLogFiles.length == 0) {
// Empty log folder. No recovery needed
continue;
}
final ServerName serverName = DefaultWALProvider.getServerNameFromWALDirectoryName(
status.getPath());
if (null == serverName) {
LOG.warn("Log folder " + status.getPath() + " doesn't look like its name includes a " +
"region server name; leaving in place. If you see later errors about missing " +
"write ahead logs they may be saved in this location.");
} else if (!onlineServers.contains(serverName)) {
LOG.info("Log folder " + status.getPath() + " doesn't belong "
+ "to a known region server, splitting");
serverNames.add(serverName);
} else {
LOG.info("Log folder " + status.getPath() + " belongs to an existing region server");
}
}
retrySplitting = false;
} catch (IOException ioe) {
LOG.warn("Failed getting failed servers to be recovered.", ioe);
if (!checkFileSystem()) {
LOG.warn("Bad Filesystem, exiting");
Runtime.getRuntime().halt(1);
}
try {
if (retrySplitting) {
Thread.sleep(conf.getInt("hbase.hlog.split.failure.retry.interval", 30 * 1000));
}
} catch (InterruptedException e) {
LOG.warn("Interrupted, aborting since cannot return w/o splitting");
Thread.currentThread().interrupt();
retrySplitting = false;
Runtime.getRuntime().halt(1);
}
}
} while (retrySplitting);
return serverNames;
}
public void splitLog(final ServerName serverName) throws IOException {
Set serverNames = new HashSet();
serverNames.add(serverName);
splitLog(serverNames);
}
/**
* Specialized method to handle the splitting for meta WAL
* @param serverName
* @throws IOException
*/
public void splitMetaLog(final ServerName serverName) throws IOException {
Set serverNames = new HashSet();
serverNames.add(serverName);
splitMetaLog(serverNames);
}
/**
* Specialized method to handle the splitting for meta WAL
* @param serverNames
* @throws IOException
*/
public void splitMetaLog(final Set serverNames) throws IOException {
splitLog(serverNames, META_FILTER);
}
@edu.umd.cs.findbugs.annotations.SuppressWarnings(value="UL_UNRELEASED_LOCK", justification=
"We only release this lock when we set it. Updates to code that uses it should verify use " +
"of the guard boolean.")
private List getLogDirs(final Set serverNames) throws IOException {
List logDirs = new ArrayList();
boolean needReleaseLock = false;
if (!this.services.isInitialized()) {
// during master initialization, we could have multiple places splitting a same wal
this.splitLogLock.lock();
needReleaseLock = true;
}
try {
for (ServerName serverName : serverNames) {
Path logDir = new Path(this.rootdir,
DefaultWALProvider.getWALDirectoryName(serverName.toString()));
Path splitDir = logDir.suffix(DefaultWALProvider.SPLITTING_EXT);
// Rename the directory so a rogue RS doesn't create more WALs
if (fs.exists(logDir)) {
if (!this.fs.rename(logDir, splitDir)) {
throw new IOException("Failed fs.rename for log split: " + logDir);
}
logDir = splitDir;
LOG.debug("Renamed region directory: " + splitDir);
} else if (!fs.exists(splitDir)) {
LOG.info("Log dir for server " + serverName + " does not exist");
continue;
}
logDirs.add(splitDir);
}
} catch (IOException ioe) {
if (!checkFileSystem()) {
this.services.abort("Aborting due to filesystem unavailable", ioe);
throw ioe;
}
} finally {
if (needReleaseLock) {
this.splitLogLock.unlock();
}
}
return logDirs;
}
/**
* Mark regions in recovering state when distributedLogReplay are set true
* @param serverName Failed region server whose wals to be replayed
* @param regions Set of regions to be recovered
* @throws IOException
*/
public void prepareLogReplay(ServerName serverName, Set regions) throws IOException {
if (!this.distributedLogReplay) {
return;
}
// mark regions in recovering state
if (regions == null || regions.isEmpty()) {
return;
}
this.splitLogManager.markRegionsRecovering(serverName, regions);
}
public void splitLog(final Set serverNames) throws IOException {
splitLog(serverNames, NON_META_FILTER);
}
/**
* Wrapper function on {@link SplitLogManager#removeStaleRecoveringRegions(Set)}
* @param failedServers
* @throws IOException
*/
void removeStaleRecoveringRegionsFromZK(final Set failedServers)
throws IOException, InterruptedIOException {
this.splitLogManager.removeStaleRecoveringRegions(failedServers);
}
/**
* This method is the base split method that splits WAL files matching a filter. Callers should
* pass the appropriate filter for meta and non-meta WALs.
* @param serverNames logs belonging to these servers will be split; this will rename the log
* directory out from under a soft-failed server
* @param filter
* @throws IOException
*/
public void splitLog(final Set serverNames, PathFilter filter) throws IOException {
long splitTime = 0, splitLogSize = 0;
List logDirs = getLogDirs(serverNames);
splitLogManager.handleDeadWorkers(serverNames);
splitTime = EnvironmentEdgeManager.currentTime();
splitLogSize = splitLogManager.splitLogDistributed(serverNames, logDirs, filter);
splitTime = EnvironmentEdgeManager.currentTime() - splitTime;
if (this.metricsMasterFilesystem != null) {
if (filter == META_FILTER) {
this.metricsMasterFilesystem.addMetaWALSplit(splitTime, splitLogSize);
} else {
this.metricsMasterFilesystem.addSplit(splitTime, splitLogSize);
}
}
}
/**
* Get the rootdir. Make sure its wholesome and exists before returning.
* @param rd
* @param c
* @param fs
* @return hbase.rootdir (after checks for existence and bootstrapping if
* needed populating the directory with necessary bootup files).
* @throws IOException
*/
@SuppressWarnings("deprecation")
private Path checkRootDir(final Path rd, final Configuration c,
final FileSystem fs)
throws IOException {
// If FS is in safe mode wait till out of it.
FSUtils.waitOnSafeMode(c, c.getInt(HConstants.THREAD_WAKE_FREQUENCY, 10 * 1000));
boolean isSecurityEnabled = "kerberos".equalsIgnoreCase(c.get("hbase.security.authentication"));
FsPermission rootDirPerms = new FsPermission(c.get("hbase.rootdir.perms", "700"));
// Filesystem is good. Go ahead and check for hbase.rootdir.
try {
if (!fs.exists(rd)) {
if (isSecurityEnabled) {
fs.mkdirs(rd, rootDirPerms);
} else {
fs.mkdirs(rd);
}
// DFS leaves safe mode with 0 DNs when there are 0 blocks.
// We used to handle this by checking the current DN count and waiting until
// it is nonzero. With security, the check for datanode count doesn't work --
// it is a privileged op. So instead we adopt the strategy of the jobtracker
// and simply retry file creation during bootstrap indefinitely. As soon as
// there is one datanode it will succeed. Permission problems should have
// already been caught by mkdirs above.
FSUtils.setVersion(fs, rd, c.getInt(HConstants.THREAD_WAKE_FREQUENCY,
10 * 1000), c.getInt(HConstants.VERSION_FILE_WRITE_ATTEMPTS,
HConstants.DEFAULT_VERSION_FILE_WRITE_ATTEMPTS));
} else {
if (!fs.isDirectory(rd)) {
throw new IllegalArgumentException(rd.toString() + " is not a directory");
}
if (isSecurityEnabled && !rootDirPerms.equals(fs.getFileStatus(rd).getPermission())) {
// check whether the permission match
LOG.warn("Found rootdir permissions NOT matching expected \"hbase.rootdir.perms\" for "
+ "rootdir=" + rd.toString() + " permissions=" + fs.getFileStatus(rd).getPermission()
+ " and \"hbase.rootdir.perms\" configured as "
+ c.get("hbase.rootdir.perms", "700") + ". Automatically setting the permissions. You"
+ " can change the permissions by setting \"hbase.rootdir.perms\" in hbase-site.xml "
+ "and restarting the master");
fs.setPermission(rd, rootDirPerms);
}
// as above
FSUtils.checkVersion(fs, rd, true, c.getInt(HConstants.THREAD_WAKE_FREQUENCY,
10 * 1000), c.getInt(HConstants.VERSION_FILE_WRITE_ATTEMPTS,
HConstants.DEFAULT_VERSION_FILE_WRITE_ATTEMPTS));
}
} catch (DeserializationException de) {
LOG.fatal("Please fix invalid configuration for " + HConstants.HBASE_DIR, de);
IOException ioe = new IOException();
ioe.initCause(de);
throw ioe;
} catch (IllegalArgumentException iae) {
LOG.fatal("Please fix invalid configuration for "
+ HConstants.HBASE_DIR + " " + rd.toString(), iae);
throw iae;
}
// Make sure cluster ID exists
if (!FSUtils.checkClusterIdExists(fs, rd, c.getInt(
HConstants.THREAD_WAKE_FREQUENCY, 10 * 1000))) {
FSUtils.setClusterId(fs, rd, new ClusterId(), c.getInt(HConstants.THREAD_WAKE_FREQUENCY, 10 * 1000));
}
clusterId = FSUtils.getClusterId(fs, rd);
// Make sure the meta region directory exists!
if (!FSUtils.metaRegionExists(fs, rd)) {
bootstrap(rd, c);
} else {
// Migrate table descriptor files if necessary
org.apache.hadoop.hbase.util.FSTableDescriptorMigrationToSubdir
.migrateFSTableDescriptorsIfNecessary(fs, rd);
}
// Create tableinfo-s for hbase:meta if not already there.
// meta table is a system table, so descriptors are predefined,
// we should get them from registry.
FSTableDescriptors fsd = new FSTableDescriptors(c, fs, rd);
fsd.createTableDescriptor(
new HTableDescriptor(fsd.get(TableName.META_TABLE_NAME)));
return rd;
}
/**
* Make sure the hbase temp directory exists and is empty.
* NOTE that this method is only executed once just after the master becomes the active one.
*/
private void checkTempDir(final Path tmpdir, final Configuration c, final FileSystem fs)
throws IOException {
// If the temp directory exists, clear the content (left over, from the previous run)
if (fs.exists(tmpdir)) {
// Archive table in temp, maybe left over from failed deletion,
// if not the cleaner will take care of them.
for (Path tabledir: FSUtils.getTableDirs(fs, tmpdir)) {
for (Path regiondir: FSUtils.getRegionDirs(fs, tabledir)) {
HFileArchiver.archiveRegion(fs, this.rootdir, tabledir, regiondir);
}
}
if (!fs.delete(tmpdir, true)) {
throw new IOException("Unable to clean the temp directory: " + tmpdir);
}
}
// Create the temp directory
if (!fs.mkdirs(tmpdir)) {
throw new IOException("HBase temp directory '" + tmpdir + "' creation failure.");
}
}
private static void bootstrap(final Path rd, final Configuration c)
throws IOException {
LOG.info("BOOTSTRAP: creating hbase:meta region");
try {
// Bootstrapping, make sure blockcache is off. Else, one will be
// created here in bootstrap and it'll need to be cleaned up. Better to
// not make it in first place. Turn off block caching for bootstrap.
// Enable after.
HRegionInfo metaHRI = new HRegionInfo(HRegionInfo.FIRST_META_REGIONINFO);
HTableDescriptor metaDescriptor = new FSTableDescriptors(c).get(TableName.META_TABLE_NAME);
setInfoFamilyCachingForMeta(metaDescriptor, false);
HRegion meta = HRegion.createHRegion(metaHRI, rd, c, metaDescriptor, null, true, true);
setInfoFamilyCachingForMeta(metaDescriptor, true);
HRegion.closeHRegion(meta);
} catch (IOException e) {
e = RemoteExceptionHandler.checkIOException(e);
LOG.error("bootstrap", e);
throw e;
}
}
/**
* Enable in memory caching for hbase:meta
*/
public static void setInfoFamilyCachingForMeta(final HTableDescriptor metaDescriptor,
final boolean b) {
for (HColumnDescriptor hcd: metaDescriptor.getColumnFamilies()) {
if (Bytes.equals(hcd.getName(), HConstants.CATALOG_FAMILY)) {
hcd.setBlockCacheEnabled(b);
hcd.setInMemory(b);
}
}
}
public void deleteRegion(HRegionInfo region) throws IOException {
HFileArchiver.archiveRegion(conf, fs, region);
}
public void deleteTable(TableName tableName) throws IOException {
fs.delete(FSUtils.getTableDir(rootdir, tableName), true);
}
/**
* Move the specified table to the hbase temp directory
* @param tableName Table name to move
* @return The temp location of the table moved
* @throws IOException in case of file-system failure
*/
public Path moveTableToTemp(TableName tableName) throws IOException {
Path srcPath = FSUtils.getTableDir(rootdir, tableName);
Path tempPath = FSUtils.getTableDir(this.tempdir, tableName);
// Ensure temp exists
if (!fs.exists(tempPath.getParent()) && !fs.mkdirs(tempPath.getParent())) {
throw new IOException("HBase temp directory '" + tempPath.getParent() + "' creation failure.");
}
if (!fs.rename(srcPath, tempPath)) {
throw new IOException("Unable to move '" + srcPath + "' to temp '" + tempPath + "'");
}
return tempPath;
}
public void updateRegionInfo(HRegionInfo region) {
// TODO implement this. i think this is currently broken in trunk i don't
// see this getting updated.
// @see HRegion.checkRegioninfoOnFilesystem()
}
public void deleteFamilyFromFS(HRegionInfo region, byte[] familyName)
throws IOException {
// archive family store files
Path tableDir = FSUtils.getTableDir(rootdir, region.getTable());
HFileArchiver.archiveFamily(fs, conf, region, tableDir, familyName);
// delete the family folder
Path familyDir = new Path(tableDir,
new Path(region.getEncodedName(), Bytes.toString(familyName)));
if (fs.delete(familyDir, true) == false) {
if (fs.exists(familyDir)) {
throw new IOException("Could not delete family "
+ Bytes.toString(familyName) + " from FileSystem for region "
+ region.getRegionNameAsString() + "(" + region.getEncodedName()
+ ")");
}
}
}
public void stop() {
if (splitLogManager != null) {
this.splitLogManager.stop();
}
}
/**
* Delete column of a table
* @param tableName
* @param familyName
* @return Modified HTableDescriptor with requested column deleted.
* @throws IOException
*/
public HTableDescriptor deleteColumn(TableName tableName, byte[] familyName)
throws IOException {
LOG.info("DeleteColumn. Table = " + tableName
+ " family = " + Bytes.toString(familyName));
HTableDescriptor htd = this.services.getTableDescriptors().get(tableName);
htd.removeFamily(familyName);
this.services.getTableDescriptors().add(htd);
return htd;
}
/**
* Modify Column of a table
* @param tableName
* @param hcd HColumnDesciptor
* @return Modified HTableDescriptor with the column modified.
* @throws IOException
*/
public HTableDescriptor modifyColumn(TableName tableName, HColumnDescriptor hcd)
throws IOException {
LOG.info("AddModifyColumn. Table = " + tableName
+ " HCD = " + hcd.toString());
HTableDescriptor htd = this.services.getTableDescriptors().get(tableName);
byte [] familyName = hcd.getName();
if(!htd.hasFamily(familyName)) {
throw new InvalidFamilyOperationException("Family '" +
Bytes.toString(familyName) + "' doesn't exists so cannot be modified");
}
htd.modifyFamily(hcd);
this.services.getTableDescriptors().add(htd);
return htd;
}
/**
* Add column to a table
* @param tableName
* @param hcd
* @return Modified HTableDescriptor with new column added.
* @throws IOException
*/
public HTableDescriptor addColumn(TableName tableName, HColumnDescriptor hcd)
throws IOException {
LOG.info("AddColumn. Table = " + tableName + " HCD = " +
hcd.toString());
HTableDescriptor htd = this.services.getTableDescriptors().get(tableName);
if (htd == null) {
throw new InvalidFamilyOperationException("Family '" +
hcd.getNameAsString() + "' cannot be modified as HTD is null");
}
htd.addFamily(hcd);
this.services.getTableDescriptors().add(htd);
return htd;
}
/**
* The function is used in SSH to set recovery mode based on configuration after all outstanding
* log split tasks drained.
* @throws IOException
*/
public void setLogRecoveryMode() throws IOException {
this.splitLogManager.setRecoveryMode(false);
}
public RecoveryMode getLogRecoveryMode() {
return this.splitLogManager.getRecoveryMode();
}
public void logFileSystemState(Log log) throws IOException {
FSUtils.logFileSystemState(fs, rootdir, log);
}
}