hadoop BlockPoolSliceStorage 源码
haddop BlockPoolSliceStorage 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolSliceStorage.java
/**
* 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.server.datanode;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentHashMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.HardLink;
import org.apache.hadoop.fs.StorageType;
import org.apache.hadoop.hdfs.protocol.LayoutVersion;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.NodeType;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.StartupOption;
import org.apache.hadoop.hdfs.server.common.InconsistentFSStateException;
import org.apache.hadoop.hdfs.server.common.Storage;
import org.apache.hadoop.hdfs.server.common.StorageInfo;
import org.apache.hadoop.hdfs.server.protocol.NamespaceInfo;
import org.apache.hadoop.util.Daemon;
import org.apache.hadoop.util.Lists;
import org.apache.hadoop.classification.VisibleForTesting;
import org.apache.hadoop.util.Preconditions;
/**
* Manages storage for the set of BlockPoolSlices which share a particular
* block pool id, on this DataNode.
*
* This class supports the following functionality:
* <ul>
* <li> Formatting a new block pool storage</li>
* <li> Recovering a storage state to a consistent state (if possible)</li>
* <li> Taking a snapshot of the block pool during upgrade</li>
* <li> Rolling back a block pool to a previous snapshot</li>
* <li> Finalizing block storage by deletion of a snapshot</li>
* </ul>
*
* @see Storage
*/
@InterfaceAudience.Private
public class BlockPoolSliceStorage extends Storage {
static final String TRASH_ROOT_DIR = "trash";
/**
* A marker file that is created on each root directory if a rolling upgrade
* is in progress. The NN does not inform the DN when a rolling upgrade is
* finalized. All the DN can infer is whether or not a rolling upgrade is
* currently in progress. When the rolling upgrade is not in progress:
* 1. If the marker file is present, then a rolling upgrade just completed.
* If a 'previous' directory exists, it can be deleted now.
* 2. If the marker file is absent, then a regular upgrade may be in
* progress. Do not delete the 'previous' directory.
*/
static final String ROLLING_UPGRADE_MARKER_FILE = "RollingUpgradeInProgress";
private static final String BLOCK_POOL_ID_PATTERN_BASE =
Pattern.quote(File.separator) +
"BP-\\d+-\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}-\\d+" +
Pattern.quote(File.separator);
private static final Pattern BLOCK_POOL_PATH_PATTERN = Pattern.compile(
"^(.*)(" + BLOCK_POOL_ID_PATTERN_BASE + ")(.*)$");
private static final Pattern BLOCK_POOL_CURRENT_PATH_PATTERN = Pattern.compile(
"^(.*)(" + BLOCK_POOL_ID_PATTERN_BASE + ")(" + STORAGE_DIR_CURRENT + ")(.*)$");
private static final Pattern BLOCK_POOL_TRASH_PATH_PATTERN = Pattern.compile(
"^(.*)(" + BLOCK_POOL_ID_PATTERN_BASE + ")(" + TRASH_ROOT_DIR + ")(.*)$");
private String blockpoolID = ""; // id of the blockpool
private Daemon trashCleaner;
public BlockPoolSliceStorage(StorageInfo storageInfo, String bpid) {
super(storageInfo);
blockpoolID = bpid;
}
/**
* These maps are used as an optimization to avoid one filesystem operation
* per storage on each heartbeat response.
*/
private static Set<String> storagesWithRollingUpgradeMarker;
private static Set<String> storagesWithoutRollingUpgradeMarker;
BlockPoolSliceStorage(int namespaceID, String bpID, long cTime,
String clusterId) {
super(NodeType.DATA_NODE);
this.namespaceID = namespaceID;
this.blockpoolID = bpID;
this.cTime = cTime;
this.clusterID = clusterId;
storagesWithRollingUpgradeMarker = Collections.newSetFromMap(
new ConcurrentHashMap<String, Boolean>());
storagesWithoutRollingUpgradeMarker = Collections.newSetFromMap(
new ConcurrentHashMap<String, Boolean>());
}
private BlockPoolSliceStorage() {
super(NodeType.DATA_NODE);
storagesWithRollingUpgradeMarker = Collections.newSetFromMap(
new ConcurrentHashMap<String, Boolean>());
storagesWithoutRollingUpgradeMarker = Collections.newSetFromMap(
new ConcurrentHashMap<String, Boolean>());
}
// Expose visibility for VolumeBuilder#commit().
public void addStorageDir(StorageDirectory sd) {
super.addStorageDir(sd);
}
/**
* Load one storage directory. Recover from previous transitions if required.
* @param nsInfo namespace information
* @param location the root path of the storage directory
* @param startOpt startup option
* @param callables list of callable storage directory
* @param conf configuration
* @return
* @throws IOException
*/
private StorageDirectory loadStorageDirectory(NamespaceInfo nsInfo,
StorageLocation location, StartupOption startOpt,
List<Callable<StorageDirectory>> callables, Configuration conf)
throws IOException {
StorageDirectory sd = new StorageDirectory(
nsInfo.getBlockPoolID(), null, true, location);
try {
StorageState curState = sd.analyzeStorage(startOpt, this, true);
// sd is locked but not opened
switch (curState) {
case NORMAL:
break;
case NON_EXISTENT:
LOG.info("Block pool storage directory for location {} and block pool"
+ " id {} does not exist", location, nsInfo.getBlockPoolID());
throw new IOException("Storage directory for location " + location +
" and block pool id " + nsInfo.getBlockPoolID() +
" does not exist");
case NOT_FORMATTED: // format
LOG.info("Block pool storage directory for location {} and block pool"
+ " id {} is not formatted. Formatting ...", location,
nsInfo.getBlockPoolID());
format(sd, nsInfo);
break;
default: // recovery part is common
sd.doRecover(curState);
}
// 2. Do transitions
// Each storage directory is treated individually.
// During startup some of them can upgrade or roll back
// while others could be up-to-date for the regular startup.
if (!doTransition(sd, nsInfo, startOpt, callables, conf)) {
// 3. Check CTime and update successfully loaded storage.
if (getCTime() != nsInfo.getCTime()) {
throw new IOException("Datanode CTime (=" + getCTime()
+ ") is not equal to namenode CTime (=" + nsInfo.getCTime() + ")");
}
setServiceLayoutVersion(getServiceLayoutVersion());
writeProperties(sd);
}
return sd;
} catch (IOException ioe) {
sd.unlock();
throw ioe;
}
}
/**
* Analyze and load storage directories. Recover from previous transitions if
* required.
*
* The block pool storages are either all analyzed or none of them is loaded.
* Therefore, a failure on loading any block pool storage results a faulty
* data volume.
*
* @param nsInfo namespace information
* @param location storage directories of block pool
* @param startOpt startup option
* @param callables list of callable storage directory
* @param conf configuration
* @return an array of loaded block pool directories.
* @throws IOException on error
*/
List<StorageDirectory> loadBpStorageDirectories(NamespaceInfo nsInfo,
StorageLocation location, StartupOption startOpt,
List<Callable<StorageDirectory>> callables, Configuration conf)
throws IOException {
List<StorageDirectory> succeedDirs = Lists.newArrayList();
try {
if (containsStorageDir(location, nsInfo.getBlockPoolID())) {
throw new IOException(
"BlockPoolSliceStorage.recoverTransitionRead: " +
"attempt to load an used block storage: " + location);
}
final StorageDirectory sd = loadStorageDirectory(
nsInfo, location, startOpt, callables, conf);
succeedDirs.add(sd);
} catch (IOException e) {
LOG.warn("Failed to analyze storage directories for block pool {}",
nsInfo.getBlockPoolID(), e);
throw e;
}
return succeedDirs;
}
/**
* Analyze storage directories. Recover from previous transitions if required.
*
* The block pool storages are either all analyzed or none of them is loaded.
* Therefore, a failure on loading any block pool storage results a faulty
* data volume.
*
* @param nsInfo namespace information
* @param location storage directories of block pool
* @param startOpt startup option
* @param callables list of callable storage directory
* @param conf configuration
* @throws IOException on error
*/
List<StorageDirectory> recoverTransitionRead(NamespaceInfo nsInfo,
StorageLocation location, StartupOption startOpt,
List<Callable<StorageDirectory>> callables, Configuration conf)
throws IOException {
LOG.info("Analyzing storage directories for bpid {}", nsInfo
.getBlockPoolID());
final List<StorageDirectory> loaded = loadBpStorageDirectories(
nsInfo, location, startOpt, callables, conf);
for (StorageDirectory sd : loaded) {
addStorageDir(sd);
}
return loaded;
}
/**
* Format a block pool slice storage.
* @param dnCurDir DataStorage current directory
* @param nsInfo the name space info
* @throws IOException Signals that an I/O exception has occurred.
*/
void format(File dnCurDir, NamespaceInfo nsInfo) throws IOException {
File curBpDir = getBpRoot(nsInfo.getBlockPoolID(), dnCurDir);
StorageDirectory bpSdir = new StorageDirectory(curBpDir);
format(bpSdir, nsInfo);
}
/**
* Format a block pool slice storage.
* @param bpSdir the block pool storage
* @param nsInfo the name space info
* @throws IOException Signals that an I/O exception has occurred.
*/
private void format(StorageDirectory bpSdir, NamespaceInfo nsInfo) throws IOException {
LOG.info("Formatting block pool {} directory {}", blockpoolID, bpSdir
.getCurrentDir());
bpSdir.clearDirectory(); // create directory
this.layoutVersion = DataNodeLayoutVersion.getCurrentLayoutVersion();
this.cTime = nsInfo.getCTime();
this.namespaceID = nsInfo.getNamespaceID();
this.blockpoolID = nsInfo.getBlockPoolID();
writeProperties(bpSdir);
}
/**
* Remove block pool level storage directory.
* @param absPathToRemove the absolute path of the root for the block pool
* level storage to remove.
*/
void remove(File absPathToRemove) {
Preconditions.checkArgument(absPathToRemove.isAbsolute());
LOG.info("Removing block level storage: {}", absPathToRemove);
for (Iterator<StorageDirectory> it = getStorageDirs().iterator();
it.hasNext(); ) {
StorageDirectory sd = it.next();
if (sd.getRoot().getAbsoluteFile().equals(absPathToRemove)) {
getStorageDirs().remove(sd);
break;
}
}
}
/**
* Set layoutVersion, namespaceID and blockpoolID into block pool storage
* VERSION file
*/
@Override
protected void setPropertiesFromFields(Properties props, StorageDirectory sd)
throws IOException {
props.setProperty("layoutVersion", String.valueOf(layoutVersion));
props.setProperty("namespaceID", String.valueOf(namespaceID));
props.setProperty("blockpoolID", blockpoolID);
props.setProperty("cTime", String.valueOf(cTime));
}
/** Validate and set block pool ID */
private void setBlockPoolID(File storage, String bpid)
throws InconsistentFSStateException {
if (bpid == null || bpid.equals("")) {
throw new InconsistentFSStateException(storage, "file "
+ STORAGE_FILE_VERSION + " is invalid.");
}
if (!blockpoolID.equals("") && !blockpoolID.equals(bpid)) {
throw new InconsistentFSStateException(storage,
"Unexpected blockpoolID " + bpid + ". Expected " + blockpoolID);
}
blockpoolID = bpid;
}
@Override
protected void setFieldsFromProperties(Properties props, StorageDirectory sd)
throws IOException {
setLayoutVersion(props, sd);
setNamespaceID(props, sd);
setcTime(props, sd);
String sbpid = props.getProperty("blockpoolID");
setBlockPoolID(sd.getRoot(), sbpid);
}
/**
* Analyze whether a transition of the BP state is required and
* perform it if necessary.
* <br>
* Rollback if:
* previousLV >= LAYOUT_VERSION && prevCTime <= namenode.cTime.
* Upgrade if:
* this.LV > LAYOUT_VERSION || this.cTime < namenode.cTime
* Regular startup if:
* this.LV = LAYOUT_VERSION && this.cTime = namenode.cTime
*
* @param sd storage directory @{literal <SD>/current/<bpid>}
* @param nsInfo namespace info
* @param startOpt startup option
* @param callables list of callable storage directory
* @param conf configuration
* @return true if the new properties has been written.
*/
private boolean doTransition(StorageDirectory sd, NamespaceInfo nsInfo,
StartupOption startOpt, List<Callable<StorageDirectory>> callables,
Configuration conf) throws IOException {
if (sd.getStorageLocation().getStorageType() == StorageType.PROVIDED) {
return false; // regular startup for PROVIDED storage directories
}
if (startOpt == StartupOption.ROLLBACK && sd.getPreviousDir().exists()) {
Preconditions.checkState(!getTrashRootDir(sd).exists(),
sd.getPreviousDir() + " and " + getTrashRootDir(sd) + " should not " +
" both be present.");
doRollback(sd, nsInfo); // rollback if applicable
} else if (startOpt == StartupOption.ROLLBACK &&
!sd.getPreviousDir().exists()) {
// Restore all the files in the trash. The restored files are retained
// during rolling upgrade rollback. They are deleted during rolling
// upgrade downgrade.
int restored = restoreBlockFilesFromTrash(getTrashRootDir(sd));
LOG.info("Restored {} block files from trash.", restored);
}
readProperties(sd);
checkVersionUpgradable(this.layoutVersion);
assert this.layoutVersion >= DataNodeLayoutVersion.getCurrentLayoutVersion()
: "Future version is not allowed";
if (getNamespaceID() != nsInfo.getNamespaceID()) {
throw new IOException("Incompatible namespaceIDs in "
+ sd.getRoot().getCanonicalPath() + ": namenode namespaceID = "
+ nsInfo.getNamespaceID() + "; datanode namespaceID = "
+ getNamespaceID());
}
if (!blockpoolID.equals(nsInfo.getBlockPoolID())) {
throw new IOException("Incompatible blockpoolIDs in "
+ sd.getRoot().getCanonicalPath() + ": namenode blockpoolID = "
+ nsInfo.getBlockPoolID() + "; datanode blockpoolID = "
+ blockpoolID);
}
if (this.layoutVersion == DataNodeLayoutVersion.getCurrentLayoutVersion()
&& this.cTime == nsInfo.getCTime()) {
return false; // regular startup
}
if (this.layoutVersion > DataNodeLayoutVersion.getCurrentLayoutVersion()) {
int restored = restoreBlockFilesFromTrash(getTrashRootDir(sd));
LOG.info("Restored {} block files from trash " +
"before the layout upgrade. These blocks will be moved to " +
"the previous directory during the upgrade", restored);
}
if (this.layoutVersion > DataNodeLayoutVersion.getCurrentLayoutVersion()
|| this.cTime < nsInfo.getCTime()) {
doUpgrade(sd, nsInfo, callables, conf); // upgrade
return true;
}
// layoutVersion == LAYOUT_VERSION && this.cTime > nsInfo.cTime
// must shutdown
throw new IOException("Datanode state: LV = " + this.getLayoutVersion()
+ " CTime = " + this.getCTime()
+ " is newer than the namespace state: LV = "
+ nsInfo.getLayoutVersion() + " CTime = " + nsInfo.getCTime());
}
/**
* Upgrade to any release after 0.22 (0.22 included) release
* e.g. 0.22 => 0.23
* Upgrade procedure is as follows:
* <ol>
* <li>If {@literal <SD>/current/<bpid>/previous} exists then delete it</li>
* <li>Rename {@literal <SD>/current/<bpid>/current} to
* {@literal <SD>/current/bpid/current/previous.tmp}</li>
* <li>Create new {@literal <SD>current/<bpid>/current} directory</li>
* <li>Hard links for block files are created from previous.tmp to current</li>
* <li>Save new version file in current directory</li>
* <li>Rename previous.tmp to previous</li>
* </ol>
*
* @param bpSd storage directory {@literal <SD>/current/<bpid>}
* @param nsInfo Namespace Info from the namenode
* @throws IOException on error
*/
private void doUpgrade(final StorageDirectory bpSd,
final NamespaceInfo nsInfo,
final List<Callable<StorageDirectory>> callables,
final Configuration conf) throws IOException {
// Upgrading is applicable only to release with federation or after
if (!DataNodeLayoutVersion.supports(
LayoutVersion.Feature.FEDERATION, layoutVersion)) {
return;
}
// no upgrades for storage directories that are PROVIDED
if (bpSd.getRoot() == null) {
return;
}
final int oldLV = getLayoutVersion();
LOG.info("Upgrading block pool storage directory {}.\n old LV = {}; old"
+ " CTime = {}.\n new LV = {}; new CTime = {}",
bpSd.getRoot(), oldLV, this.getCTime(),
DataNodeLayoutVersion.getCurrentLayoutVersion(), nsInfo.getCTime());
// get <SD>/previous directory
String dnRoot = getDataNodeStorageRoot(bpSd.getRoot().getCanonicalPath());
StorageDirectory dnSdStorage = new StorageDirectory(new File(dnRoot));
File dnPrevDir = dnSdStorage.getPreviousDir();
// If <SD>/previous directory exists delete it
if (dnPrevDir.exists()) {
deleteDir(dnPrevDir);
}
final File bpCurDir = bpSd.getCurrentDir();
final File bpPrevDir = bpSd.getPreviousDir();
assert bpCurDir.exists() : "BP level current directory must exist.";
cleanupDetachDir(new File(bpCurDir, DataStorage.STORAGE_DIR_DETACHED));
// 1. Delete <SD>/current/<bpid>/previous dir before upgrading
if (bpPrevDir.exists()) {
deleteDir(bpPrevDir);
}
final File bpTmpDir = bpSd.getPreviousTmp();
assert !bpTmpDir.exists() : "previous.tmp directory must not exist.";
// 2. Rename <SD>/current/<bpid>/current to
// <SD>/current/<bpid>/previous.tmp
rename(bpCurDir, bpTmpDir);
final String name = "block pool " + blockpoolID + " at " + bpSd.getRoot();
if (callables == null) {
doUpgrade(name, bpSd, nsInfo, bpPrevDir, bpTmpDir, bpCurDir, oldLV, conf);
} else {
callables.add(new Callable<StorageDirectory>() {
@Override
public StorageDirectory call() throws Exception {
doUpgrade(name, bpSd, nsInfo, bpPrevDir, bpTmpDir, bpCurDir, oldLV,
conf);
return bpSd;
}
});
}
}
private void doUpgrade(String name, final StorageDirectory bpSd,
NamespaceInfo nsInfo, final File bpPrevDir, final File bpTmpDir,
final File bpCurDir, final int oldLV, Configuration conf)
throws IOException {
// 3. Create new <SD>/current with block files hardlinks and VERSION
linkAllBlocks(bpTmpDir, bpCurDir, oldLV, conf);
this.layoutVersion = DataNodeLayoutVersion.getCurrentLayoutVersion();
assert this.namespaceID == nsInfo.getNamespaceID()
: "Data-node and name-node layout versions must be the same.";
this.cTime = nsInfo.getCTime();
writeProperties(bpSd);
// 4.rename <SD>/current/<bpid>/previous.tmp to
// <SD>/current/<bpid>/previous
rename(bpTmpDir, bpPrevDir);
LOG.info("Upgrade of {} is complete", name);
}
/**
* Cleanup the detachDir.
*
* If the directory is not empty report an error; Otherwise remove the
* directory.
*
* @param detachDir detach directory
* @throws IOException if the directory is not empty or it can not be removed
*/
private void cleanupDetachDir(File detachDir) throws IOException {
if (!DataNodeLayoutVersion.supports(
LayoutVersion.Feature.APPEND_RBW_DIR, layoutVersion)
&& detachDir.exists() && detachDir.isDirectory()) {
if (FileUtil.list(detachDir).length != 0) {
throw new IOException("Detached directory " + detachDir
+ " is not empty. Please manually move each file under this "
+ "directory to the finalized directory if the finalized "
+ "directory tree does not have the file.");
} else if (!detachDir.delete()) {
throw new IOException("Cannot remove directory " + detachDir);
}
}
}
/**
* Restore all files from the trash directory to their corresponding
* locations under current/
*/
private int restoreBlockFilesFromTrash(File trashRoot)
throws IOException {
int filesRestored = 0;
File[] children = trashRoot.exists() ? trashRoot.listFiles() : null;
if (children == null) {
return 0;
}
File restoreDirectory = null;
for (File child : children) {
if (child.isDirectory()) {
// Recurse to process subdirectories.
filesRestored += restoreBlockFilesFromTrash(child);
continue;
}
if (restoreDirectory == null) {
restoreDirectory = new File(getRestoreDirectory(child));
if (!restoreDirectory.exists() && !restoreDirectory.mkdirs()) {
throw new IOException("Failed to create directory " + restoreDirectory);
}
}
final File newChild = new File(restoreDirectory, child.getName());
if (newChild.exists() && newChild.length() >= child.length()) {
// Failsafe - we should not hit this case but let's make sure
// we never overwrite a newer version of a block file with an
// older version.
LOG.info("Not overwriting {} with smaller file from " +
"trash directory. This message can be safely ignored.", newChild);
} else if (!child.renameTo(newChild)) {
throw new IOException("Failed to rename " + child + " to " + newChild);
} else {
++filesRestored;
}
}
FileUtil.fullyDelete(trashRoot);
return filesRestored;
}
/*
* Roll back to old snapshot at the block pool level
* If previous directory exists:
* <ol>
* <li>Rename <SD>/current/<bpid>/current to removed.tmp</li>
* <li>Rename * <SD>/current/<bpid>/previous to current</li>
* <li>Remove removed.tmp</li>
* </ol>
*
* Do nothing if previous directory does not exist.
* @param bpSd Block pool storage directory at <SD>/current/<bpid>
*/
void doRollback(StorageDirectory bpSd, NamespaceInfo nsInfo)
throws IOException {
File prevDir = bpSd.getPreviousDir();
// regular startup if previous dir does not exist
if (prevDir == null || !prevDir.exists()) {
return;
}
// read attributes out of the VERSION file of previous directory
BlockPoolSliceStorage prevInfo = new BlockPoolSliceStorage();
prevInfo.readPreviousVersionProperties(bpSd);
// We allow rollback to a state, which is either consistent with
// the namespace state or can be further upgraded to it.
// In another word, we can only roll back when ( storedLV >= software LV)
// && ( DN.previousCTime <= NN.ctime)
if (!(prevInfo.getLayoutVersion() >=
DataNodeLayoutVersion.getCurrentLayoutVersion() &&
prevInfo.getCTime() <= nsInfo.getCTime())) { // cannot rollback
throw new InconsistentFSStateException(bpSd.getRoot(),
"Cannot rollback to a newer state.\nDatanode previous state: LV = "
+ prevInfo.getLayoutVersion() + " CTime = " + prevInfo.getCTime()
+ " is newer than the namespace state: LV = "
+ DataNodeLayoutVersion.getCurrentLayoutVersion() + " CTime = "
+ nsInfo.getCTime());
}
LOG.info("Rolling back storage directory {}.\n target LV = {}; target "
+ "CTime = {}", bpSd.getRoot(), nsInfo.getLayoutVersion(),
nsInfo.getCTime());
File tmpDir = bpSd.getRemovedTmp();
assert !tmpDir.exists() : "removed.tmp directory must not exist.";
// 1. rename current to tmp
File curDir = bpSd.getCurrentDir();
assert curDir.exists() : "Current directory must exist.";
rename(curDir, tmpDir);
// 2. rename previous to current
rename(prevDir, curDir);
// 3. delete removed.tmp dir
deleteDir(tmpDir);
LOG.info("Rollback of {} is complete", bpSd.getRoot());
}
/*
* Finalize the block pool storage by deleting <BP>/previous directory
* that holds the snapshot.
*/
void doFinalize(File dnCurDir) throws IOException {
if (dnCurDir == null) {
return; //we do nothing if the directory is null
}
File bpRoot = getBpRoot(blockpoolID, dnCurDir);
StorageDirectory bpSd = new StorageDirectory(bpRoot);
// block pool level previous directory
File prevDir = bpSd.getPreviousDir();
if (!prevDir.exists()) {
return; // already finalized
}
final String dataDirPath = bpSd.getRoot().getCanonicalPath();
LOG.info("Finalizing upgrade for storage directory {}.\n cur LV = {}; "
+ "cur CTime = {}", dataDirPath, this.getLayoutVersion(),
this.getCTime());
assert bpSd.getCurrentDir().exists() : "Current directory must exist.";
// rename previous to finalized.tmp
final File tmpDir = bpSd.getFinalizedTmp();
rename(prevDir, tmpDir);
// delete finalized.tmp dir in a separate thread
new Daemon(new Runnable() {
@Override
public void run() {
try {
deleteDir(tmpDir);
} catch (IOException ex) {
LOG.error("Finalize upgrade for {} failed.", dataDirPath, ex);
}
LOG.info("Finalize upgrade for {} is complete.", dataDirPath);
}
@Override
public String toString() {
return "Finalize " + dataDirPath;
}
}).start();
}
/**
* Hardlink all finalized and RBW blocks in fromDir to toDir
*
* @param fromDir directory where the snapshot is stored
* @param toDir the current data directory
* @throws IOException if error occurs during hardlink
*/
private static void linkAllBlocks(File fromDir, File toDir,
int diskLayoutVersion, Configuration conf) throws IOException {
// do the link
// hardlink finalized blocks in tmpDir
HardLink hardLink = new HardLink();
DataStorage.linkBlocks(fromDir, toDir, DataStorage.STORAGE_DIR_FINALIZED,
diskLayoutVersion, hardLink, conf);
DataStorage.linkBlocks(fromDir, toDir, DataStorage.STORAGE_DIR_RBW,
diskLayoutVersion, hardLink, conf);
LOG.info("Linked blocks from {} to {}. {}", fromDir, toDir,
hardLink.linkStats.report());
}
/**
* gets the data node storage directory based on block pool storage
*/
private static String getDataNodeStorageRoot(String bpRoot) {
Matcher matcher = BLOCK_POOL_PATH_PATTERN.matcher(bpRoot);
if (matcher.matches()) {
// return the data node root directory
return matcher.group(1);
}
return bpRoot;
}
@Override
public String toString() {
return super.toString() + ";bpid=" + blockpoolID;
}
/**
* Get a block pool storage root based on data node storage root
* @param bpID block pool ID
* @param dnCurDir data node storage root directory
* @return root directory for block pool storage
*/
public static File getBpRoot(String bpID, File dnCurDir) {
return new File(dnCurDir, bpID);
}
@Override
public boolean isPreUpgradableLayout(StorageDirectory sd) throws IOException {
return false;
}
private File getTrashRootDir(StorageDirectory sd) {
return new File(sd.getRoot(), TRASH_ROOT_DIR);
}
/**
* Determine whether we can use trash for the given blockFile. Trash
* is disallowed if a 'previous' directory exists for the
* storage directory containing the block.
*/
@VisibleForTesting
public boolean isTrashAllowed(File blockFile) {
Matcher matcher = BLOCK_POOL_CURRENT_PATH_PATTERN.matcher(blockFile.getParent());
String previousDir = matcher.replaceFirst("$1$2" + STORAGE_DIR_PREVIOUS);
return !(new File(previousDir)).exists();
}
/**
* Get a target subdirectory under trash/ for a given block file that is being
* deleted.
*
* The subdirectory structure under trash/ mirrors that under current/ to keep
* implicit memory of where the files are to be restored (if necessary).
*
* @return the trash directory for a given block file that is being deleted.
*/
public String getTrashDirectory(ReplicaInfo info) {
URI blockURI = info.getBlockURI();
try{
File blockFile = new File(blockURI);
return getTrashDirectory(blockFile);
} catch (IllegalArgumentException e) {
LOG.warn("Failed to get block file for replica {}", info, e);
}
return null;
}
private String getTrashDirectory(File blockFile) {
if (isTrashAllowed(blockFile)) {
Matcher matcher = BLOCK_POOL_CURRENT_PATH_PATTERN.matcher(blockFile.getParent());
String trashDirectory = matcher.replaceFirst("$1$2" + TRASH_ROOT_DIR + "$4");
return trashDirectory;
}
return null;
}
/**
* Get a target subdirectory under current/ for a given block file that is
* being restored from trash.
*
* The subdirectory structure under trash/ mirrors that under current/ to keep
* implicit memory of where the files are to be restored.
* @param blockFile block file that is being restored from trash.
* @return the target directory to restore a previously deleted block file.
*/
@VisibleForTesting
String getRestoreDirectory(File blockFile) {
Matcher matcher = BLOCK_POOL_TRASH_PATH_PATTERN.matcher(blockFile.getParent());
String restoreDirectory = matcher.replaceFirst("$1$2" + STORAGE_DIR_CURRENT + "$4");
LOG.info("Restoring {} to {}", blockFile, restoreDirectory);
return restoreDirectory;
}
/**
* Delete all files and directories in the trash directories.
*/
public void clearTrash() {
final List<File> trashRoots = new ArrayList<>();
for (StorageDirectory sd : getStorageDirs()) {
File trashRoot = getTrashRootDir(sd);
if (trashRoot.exists() && sd.getPreviousDir().exists()) {
LOG.error("Trash and PreviousDir shouldn't both exist for storage "
+ "directory {}", sd);
assert false;
} else {
trashRoots.add(trashRoot);
}
}
stopTrashCleaner();
trashCleaner = new Daemon(new Runnable() {
@Override
public void run() {
for(File trashRoot : trashRoots){
FileUtil.fullyDelete(trashRoot);
LOG.info("Cleared trash for storage directory {}", trashRoot);
}
}
@Override
public String toString() {
return "clearTrash() for " + blockpoolID;
}
});
trashCleaner.start();
}
public void stopTrashCleaner() {
if (trashCleaner != null) {
trashCleaner.interrupt();
}
}
/** trash is enabled if at least one storage directory contains trash root */
@VisibleForTesting
public boolean trashEnabled() {
for (StorageDirectory sd : getStorageDirs()) {
if (getTrashRootDir(sd).exists()) {
return true;
}
}
return false;
}
/**
* Create a rolling upgrade marker file for each BP storage root, if it
* does not exist already.
* @param dnStorageDirs
*/
public void setRollingUpgradeMarkers(List<StorageDirectory> dnStorageDirs)
throws IOException {
for (StorageDirectory sd : dnStorageDirs) {
if (sd.getCurrentDir() == null) {
return;
}
File bpRoot = getBpRoot(blockpoolID, sd.getCurrentDir());
File markerFile = new File(bpRoot, ROLLING_UPGRADE_MARKER_FILE);
if (!storagesWithRollingUpgradeMarker.contains(bpRoot.toString())) {
if (!markerFile.exists() && markerFile.createNewFile()) {
LOG.info("Created {}", markerFile);
} else {
LOG.info("{} already exists.", markerFile);
}
storagesWithRollingUpgradeMarker.add(bpRoot.toString());
storagesWithoutRollingUpgradeMarker.remove(bpRoot.toString());
}
}
}
/**
* Check whether the rolling upgrade marker file exists for each BP storage
* root. If it does exist, then the marker file is cleared and more
* importantly the layout upgrade is finalized.
* @param dnStorageDirs
*/
public void clearRollingUpgradeMarkers(List<StorageDirectory> dnStorageDirs)
throws IOException {
for (StorageDirectory sd : dnStorageDirs) {
if (sd.getCurrentDir() == null) {
continue;
}
File bpRoot = getBpRoot(blockpoolID, sd.getCurrentDir());
File markerFile = new File(bpRoot, ROLLING_UPGRADE_MARKER_FILE);
if (!storagesWithoutRollingUpgradeMarker.contains(bpRoot.toString())) {
if (markerFile.exists()) {
LOG.info("Deleting {}", markerFile);
doFinalize(sd.getCurrentDir());
if (!markerFile.delete()) {
LOG.warn("Failed to delete {}", markerFile);
}
}
storagesWithoutRollingUpgradeMarker.add(bpRoot.toString());
storagesWithRollingUpgradeMarker.remove(bpRoot.toString());
}
}
}
}
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