/**
* 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.namenode;
import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.net.URI;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import java.util.UUID;
import java.util.concurrent.CopyOnWriteArrayList;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.hdfs.DFSUtil;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.protocol.LayoutVersion;
import org.apache.hadoop.hdfs.protocol.LayoutVersion.Feature;
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.StorageErrorReporter;
import org.apache.hadoop.hdfs.server.common.Util;
import org.apache.hadoop.hdfs.server.protocol.NamespaceInfo;
import org.apache.hadoop.hdfs.util.PersistentLongFile;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.net.DNS;
import org.apache.hadoop.util.Time;
import com.google.common.base.Preconditions;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.Lists;
/**
* NNStorage is responsible for management of the StorageDirectories used by
* the NameNode.
*/
@InterfaceAudience.Private
public class NNStorage extends Storage implements Closeable,
StorageErrorReporter {
static final String DEPRECATED_MESSAGE_DIGEST_PROPERTY = "imageMD5Digest";
static final String LOCAL_URI_SCHEME = "file";
//
// The filenames used for storing the images
//
enum NameNodeFile {
IMAGE ("fsimage"),
TIME ("fstime"), // from "old" pre-HDFS-1073 format
SEEN_TXID ("seen_txid"),
EDITS ("edits"),
IMAGE_NEW ("fsimage.ckpt"),
EDITS_NEW ("edits.new"), // from "old" pre-HDFS-1073 format
EDITS_INPROGRESS ("edits_inprogress"),
EDITS_TMP ("edits_tmp");
private String fileName = null;
private NameNodeFile(String name) { this.fileName = name; }
String getName() { return fileName; }
}
/**
* Implementation of StorageDirType specific to namenode storage
* A Storage directory could be of type IMAGE which stores only fsimage,
* or of type EDITS which stores edits or of type IMAGE_AND_EDITS which
* stores both fsimage and edits.
*/
static enum NameNodeDirType implements StorageDirType {
UNDEFINED,
IMAGE,
EDITS,
IMAGE_AND_EDITS;
@Override
public StorageDirType getStorageDirType() {
return this;
}
@Override
public boolean isOfType(StorageDirType type) {
if ((this == IMAGE_AND_EDITS) && (type == IMAGE || type == EDITS))
return true;
return this == type;
}
}
protected String blockpoolID = ""; // id of the block pool
/**
* flag that controls if we try to restore failed storages
*/
private boolean restoreFailedStorage = false;
private Object restorationLock = new Object();
private boolean disablePreUpgradableLayoutCheck = false;
/**
* TxId of the last transaction that was included in the most
* recent fsimage file. This does not include any transactions
* that have since been written to the edit log.
*/
protected long mostRecentCheckpointTxId = HdfsConstants.INVALID_TXID;
/**
* Time of the last checkpoint, in milliseconds since the epoch.
*/
private long mostRecentCheckpointTime = 0;
/**
* list of failed (and thus removed) storages
*/
final protected List<StorageDirectory> removedStorageDirs
= new CopyOnWriteArrayList<StorageDirectory>();
/**
* Properties from old layout versions that may be needed
* during upgrade only.
*/
private HashMap<String, String> deprecatedProperties;
/**
* Construct the NNStorage.
* @param conf Namenode configuration.
* @param imageDirs Directories the image can be stored in.
* @param editsDirs Directories the editlog can be stored in.
* @throws IOException if any directories are inaccessible.
*/
public NNStorage(Configuration conf,
Collection<URI> imageDirs, Collection<URI> editsDirs)
throws IOException {
super(NodeType.NAME_NODE);
storageDirs = new CopyOnWriteArrayList<StorageDirectory>();
// this may modify the editsDirs, so copy before passing in
setStorageDirectories(imageDirs,
Lists.newArrayList(editsDirs),
FSNamesystem.getSharedEditsDirs(conf));
}
@Override // Storage
public boolean isPreUpgradableLayout(StorageDirectory sd) throws IOException {
if (disablePreUpgradableLayoutCheck) {
return false;
}
File oldImageDir = new File(sd.getRoot(), "image");
if (!oldImageDir.exists()) {
return false;
}
// check the layout version inside the image file
File oldF = new File(oldImageDir, "fsimage");
RandomAccessFile oldFile = new RandomAccessFile(oldF, "rws");
try {
oldFile.seek(0);
int oldVersion = oldFile.readInt();
oldFile.close();
oldFile = null;
if (oldVersion < LAST_PRE_UPGRADE_LAYOUT_VERSION)
return false;
} finally {
IOUtils.cleanup(LOG, oldFile);
}
return true;
}
@Override // Closeable
public void close() throws IOException {
unlockAll();
storageDirs.clear();
}
/**
* Set flag whether an attempt should be made to restore failed storage
* directories at the next available oppurtuinity.
*
* @param val Whether restoration attempt should be made.
*/
void setRestoreFailedStorage(boolean val) {
LOG.warn("set restore failed storage to " + val);
restoreFailedStorage=val;
}
/**
* @return Whether failed storage directories are to be restored.
*/
boolean getRestoreFailedStorage() {
return restoreFailedStorage;
}
/**
* See if any of removed storages is "writable" again, and can be returned
* into service.
*/
void attemptRestoreRemovedStorage() {
// if directory is "alive" - copy the images there...
if(!restoreFailedStorage || removedStorageDirs.size() == 0)
return; //nothing to restore
/* We don't want more than one thread trying to restore at a time */
synchronized (this.restorationLock) {
LOG.info("NNStorage.attemptRestoreRemovedStorage: check removed(failed) "+
"storarge. removedStorages size = " + removedStorageDirs.size());
for(Iterator<StorageDirectory> it
= this.removedStorageDirs.iterator(); it.hasNext();) {
StorageDirectory sd = it.next();
File root = sd.getRoot();
LOG.info("currently disabled dir " + root.getAbsolutePath() +
"; type="+sd.getStorageDirType()
+ ";canwrite="+FileUtil.canWrite(root));
if(root.exists() && FileUtil.canWrite(root)) {
LOG.info("restoring dir " + sd.getRoot().getAbsolutePath());
this.addStorageDir(sd); // restore
this.removedStorageDirs.remove(sd);
}
}
}
}
/**
* @return A list of storage directories which are in the errored state.
*/
List<StorageDirectory> getRemovedStorageDirs() {
return this.removedStorageDirs;
}
/**
* See {@link NNStorage#setStorageDirectories(Collection, Collection, Collection)}
*/
@VisibleForTesting
synchronized void setStorageDirectories(Collection<URI> fsNameDirs,
Collection<URI> fsEditsDirs)
throws IOException {
setStorageDirectories(fsNameDirs, fsEditsDirs, new ArrayList<URI>());
}
/**
* Set the storage directories which will be used. This should only ever be
* called from inside NNStorage. However, it needs to remain package private
* for testing, as StorageDirectories need to be reinitialised after using
* Mockito.spy() on this class, as Mockito doesn't work well with inner
* classes, such as StorageDirectory in this case.
*
* Synchronized due to initialization of storageDirs and removedStorageDirs.
*
* @param fsNameDirs Locations to store images.
* @param fsEditsDirs Locations to store edit logs.
* @throws IOException
*/
@VisibleForTesting
synchronized void setStorageDirectories(Collection<URI> fsNameDirs,
Collection<URI> fsEditsDirs,
Collection<URI> sharedEditsDirs)
throws IOException {
this.storageDirs.clear();
this.removedStorageDirs.clear();
// Add all name dirs with appropriate NameNodeDirType
for (URI dirName : fsNameDirs) {
checkSchemeConsistency(dirName);
boolean isAlsoEdits = false;
for (URI editsDirName : fsEditsDirs) {
if (editsDirName.compareTo(dirName) == 0) {
isAlsoEdits = true;
fsEditsDirs.remove(editsDirName);
break;
}
}
NameNodeDirType dirType = (isAlsoEdits) ?
NameNodeDirType.IMAGE_AND_EDITS :
NameNodeDirType.IMAGE;
// Add to the list of storage directories, only if the
// URI is of type file://
if(dirName.getScheme().compareTo("file") == 0) {
this.addStorageDir(new StorageDirectory(new File(dirName.getPath()),
dirType,
!sharedEditsDirs.contains(dirName))); // Don't lock the dir if it's shared.
}
}
// Add edits dirs if they are different from name dirs
for (URI dirName : fsEditsDirs) {
checkSchemeConsistency(dirName);
// Add to the list of storage directories, only if the
// URI is of type file://
if(dirName.getScheme().compareTo("file") == 0)
this.addStorageDir(new StorageDirectory(new File(dirName.getPath()),
NameNodeDirType.EDITS, !sharedEditsDirs.contains(dirName)));
}
}
/**
* Return the storage directory corresponding to the passed URI
* @param uri URI of a storage directory
* @return The matching storage directory or null if none found
*/
StorageDirectory getStorageDirectory(URI uri) {
try {
uri = Util.fileAsURI(new File(uri));
Iterator<StorageDirectory> it = dirIterator();
for (; it.hasNext(); ) {
StorageDirectory sd = it.next();
if (Util.fileAsURI(sd.getRoot()).equals(uri)) {
return sd;
}
}
} catch (IOException ioe) {
LOG.warn("Error converting file to URI", ioe);
}
return null;
}
/**
* Checks the consistency of a URI, in particular if the scheme
* is specified
* @param u URI whose consistency is being checked.
*/
private static void checkSchemeConsistency(URI u) throws IOException {
String scheme = u.getScheme();
// the URI should have a proper scheme
if(scheme == null) {
throw new IOException("Undefined scheme for " + u);
}
}
/**
* Retrieve current directories of type IMAGE
* @return Collection of URI representing image directories
* @throws IOException in case of URI processing error
*/
Collection<URI> getImageDirectories() throws IOException {
return getDirectories(NameNodeDirType.IMAGE);
}
/**
* Retrieve current directories of type EDITS
* @return Collection of URI representing edits directories
* @throws IOException in case of URI processing error
*/
Collection<URI> getEditsDirectories() throws IOException {
return getDirectories(NameNodeDirType.EDITS);
}
/**
* Return number of storage directories of the given type.
* @param dirType directory type
* @return number of storage directories of type dirType
*/
int getNumStorageDirs(NameNodeDirType dirType) {
if(dirType == null)
return getNumStorageDirs();
Iterator<StorageDirectory> it = dirIterator(dirType);
int numDirs = 0;
for(; it.hasNext(); it.next())
numDirs++;
return numDirs;
}
/**
* Return the list of locations being used for a specific purpose.
* i.e. Image or edit log storage.
*
* @param dirType Purpose of locations requested.
* @throws IOException
*/
Collection<URI> getDirectories(NameNodeDirType dirType)
throws IOException {
ArrayList<URI> list = new ArrayList<URI>();
Iterator<StorageDirectory> it = (dirType == null) ? dirIterator() :
dirIterator(dirType);
for ( ;it.hasNext(); ) {
StorageDirectory sd = it.next();
try {
list.add(Util.fileAsURI(sd.getRoot()));
} catch (IOException e) {
throw new IOException("Exception while processing " +
"StorageDirectory " + sd.getRoot(), e);
}
}
return list;
}
/**
* Determine the last transaction ID noted in this storage directory.
* This txid is stored in a special seen_txid file since it might not
* correspond to the latest image or edit log. For example, an image-only
* directory will have this txid incremented when edits logs roll, even
* though the edits logs are in a different directory.
*
* @param sd StorageDirectory to check
* @return If file exists and can be read, last recorded txid. If not, 0L.
* @throws IOException On errors processing file pointed to by sd
*/
static long readTransactionIdFile(StorageDirectory sd) throws IOException {
File txidFile = getStorageFile(sd, NameNodeFile.SEEN_TXID);
return PersistentLongFile.readFile(txidFile, 0);
}
/**
* Write last checkpoint time into a separate file.
*
* @param sd
* @throws IOException
*/
void writeTransactionIdFile(StorageDirectory sd, long txid) throws IOException {
Preconditions.checkArgument(txid >= 0, "bad txid: " + txid);
File txIdFile = getStorageFile(sd, NameNodeFile.SEEN_TXID);
PersistentLongFile.writeFile(txIdFile, txid);
}
/**
* Set the transaction ID and time of the last checkpoint
*
* @param txid transaction id of the last checkpoint
* @param time time of the last checkpoint, in millis since the epoch
*/
void setMostRecentCheckpointInfo(long txid, long time) {
this.mostRecentCheckpointTxId = txid;
this.mostRecentCheckpointTime = time;
}
/**
* @return the transaction ID of the last checkpoint.
*/
public long getMostRecentCheckpointTxId() {
return mostRecentCheckpointTxId;
}
/**
* @return the time of the most recent checkpoint in millis since the epoch.
*/
long getMostRecentCheckpointTime() {
return mostRecentCheckpointTime;
}
/**
* Write a small file in all available storage directories that
* indicates that the namespace has reached some given transaction ID.
*
* This is used when the image is loaded to avoid accidental rollbacks
* in the case where an edit log is fully deleted but there is no
* checkpoint. See TestNameEditsConfigs.testNameEditsConfigsFailure()
* @param txid the txid that has been reached
*/
public void writeTransactionIdFileToStorage(long txid) {
// Write txid marker in all storage directories
for (StorageDirectory sd : storageDirs) {
try {
writeTransactionIdFile(sd, txid);
} catch(IOException e) {
// Close any edits stream associated with this dir and remove directory
LOG.warn("writeTransactionIdToStorage failed on " + sd,
e);
reportErrorsOnDirectory(sd);
}
}
}
/**
* Return the name of the image file that is uploaded by periodic
* checkpointing
*
* @return List of filenames to save checkpoints to.
*/
public File[] getFsImageNameCheckpoint(long txid) {
ArrayList<File> list = new ArrayList<File>();
for (Iterator<StorageDirectory> it =
dirIterator(NameNodeDirType.IMAGE); it.hasNext();) {
list.add(getStorageFile(it.next(), NameNodeFile.IMAGE_NEW, txid));
}
return list.toArray(new File[list.size()]);
}
/**
* Return the name of the image file.
* @return The name of the first image file.
*/
public File getFsImageName(long txid) {
StorageDirectory sd = null;
for (Iterator<StorageDirectory> it =
dirIterator(NameNodeDirType.IMAGE); it.hasNext();) {
sd = it.next();
File fsImage = getStorageFile(sd, NameNodeFile.IMAGE, txid);
if(FileUtil.canRead(sd.getRoot()) && fsImage.exists())
return fsImage;
}
return null;
}
public File getHighestFsImageName() {
return getFsImageName(getMostRecentCheckpointTxId());
}
/** Create new dfs name directory. Caution: this destroys all files
* in this filesystem. */
private void format(StorageDirectory sd) throws IOException {
sd.clearDirectory(); // create currrent dir
writeProperties(sd);
writeTransactionIdFile(sd, 0);
LOG.info("Storage directory " + sd.getRoot()
+ " has been successfully formatted.");
}
/**
* Format all available storage directories.
*/
public void format(NamespaceInfo nsInfo) throws IOException {
Preconditions.checkArgument(nsInfo.getLayoutVersion() == 0 ||
nsInfo.getLayoutVersion() == HdfsConstants.LAYOUT_VERSION,
"Bad layout version: %s", nsInfo.getLayoutVersion());
this.setStorageInfo(nsInfo);
this.blockpoolID = nsInfo.getBlockPoolID();
for (Iterator<StorageDirectory> it =
dirIterator(); it.hasNext();) {
StorageDirectory sd = it.next();
format(sd);
}
}
public static NamespaceInfo newNamespaceInfo()
throws UnknownHostException {
return new NamespaceInfo(newNamespaceID(), newClusterID(),
newBlockPoolID(), 0L);
}
public void format() throws IOException {
this.layoutVersion = HdfsConstants.LAYOUT_VERSION;
for (Iterator<StorageDirectory> it =
dirIterator(); it.hasNext();) {
StorageDirectory sd = it.next();
format(sd);
}
}
/**
* Generate new namespaceID.
*
* namespaceID is a persistent attribute of the namespace.
* It is generated when the namenode is formatted and remains the same
* during the life cycle of the namenode.
* When a datanodes register they receive it as the registrationID,
* which is checked every time the datanode is communicating with the
* namenode. Datanodes that do not 'know' the namespaceID are rejected.
*
* @return new namespaceID
*/
private static int newNamespaceID() {
int newID = 0;
while(newID == 0)
newID = DFSUtil.getRandom().nextInt(0x7FFFFFFF); // use 31 bits only
return newID;
}
@Override // Storage
protected void setFieldsFromProperties(
Properties props, StorageDirectory sd) throws IOException {
super.setFieldsFromProperties(props, sd);
if (layoutVersion == 0) {
throw new IOException("NameNode directory "
+ sd.getRoot() + " is not formatted.");
}
// Set Block pool ID in version with federation support
if (versionSupportsFederation()) {
String sbpid = props.getProperty("blockpoolID");
setBlockPoolID(sd.getRoot(), sbpid);
}
setDeprecatedPropertiesForUpgrade(props);
}
/**
* Pull any properties out of the VERSION file that are from older
* versions of HDFS and only necessary during upgrade.
*/
private void setDeprecatedPropertiesForUpgrade(Properties props) {
deprecatedProperties = new HashMap<String, String>();
String md5 = props.getProperty(DEPRECATED_MESSAGE_DIGEST_PROPERTY);
if (md5 != null) {
deprecatedProperties.put(DEPRECATED_MESSAGE_DIGEST_PROPERTY, md5);
}
}
/**
* Return a property that was stored in an earlier version of HDFS.
*
* This should only be used during upgrades.
*/
String getDeprecatedProperty(String prop) {
assert getLayoutVersion() > HdfsConstants.LAYOUT_VERSION :
"getDeprecatedProperty should only be done when loading " +
"storage from past versions during upgrade.";
return deprecatedProperties.get(prop);
}
/**
* Write version file into the storage directory.
*
* The version file should always be written last.
* Missing or corrupted version file indicates that
* the checkpoint is not valid.
*
* @param sd storage directory
* @throws IOException
*/
@Override // Storage
protected void setPropertiesFromFields(Properties props,
StorageDirectory sd
) throws IOException {
super.setPropertiesFromFields(props, sd);
// Set blockpoolID in version with federation support
if (versionSupportsFederation()) {
props.setProperty("blockpoolID", blockpoolID);
}
}
static File getStorageFile(StorageDirectory sd, NameNodeFile type, long imageTxId) {
return new File(sd.getCurrentDir(),
String.format("%s_%019d", type.getName(), imageTxId));
}
/**
* Get a storage file for one of the files that doesn't need a txid associated
* (e.g version, seen_txid)
*/
static File getStorageFile(StorageDirectory sd, NameNodeFile type) {
return new File(sd.getCurrentDir(), type.getName());
}
@VisibleForTesting
public static String getCheckpointImageFileName(long txid) {
return String.format("%s_%019d",
NameNodeFile.IMAGE_NEW.getName(), txid);
}
@VisibleForTesting
public static String getImageFileName(long txid) {
return String.format("%s_%019d",
NameNodeFile.IMAGE.getName(), txid);
}
@VisibleForTesting
public static String getInProgressEditsFileName(long startTxId) {
return String.format("%s_%019d", NameNodeFile.EDITS_INPROGRESS.getName(),
startTxId);
}
static File getInProgressEditsFile(StorageDirectory sd, long startTxId) {
return new File(sd.getCurrentDir(), getInProgressEditsFileName(startTxId));
}
static File getFinalizedEditsFile(StorageDirectory sd,
long startTxId, long endTxId) {
return new File(sd.getCurrentDir(),
getFinalizedEditsFileName(startTxId, endTxId));
}
static File getTemporaryEditsFile(StorageDirectory sd,
long startTxId, long endTxId, long timestamp) {
return new File(sd.getCurrentDir(),
getTemporaryEditsFileName(startTxId, endTxId, timestamp));
}
static File getImageFile(StorageDirectory sd, long txid) {
return new File(sd.getCurrentDir(),
getImageFileName(txid));
}
@VisibleForTesting
public static String getFinalizedEditsFileName(long startTxId, long endTxId) {
return String.format("%s_%019d-%019d", NameNodeFile.EDITS.getName(),
startTxId, endTxId);
}
public static String getTemporaryEditsFileName(long startTxId, long endTxId,
long timestamp) {
return String.format("%s_%019d-%019d_%019d", NameNodeFile.EDITS_TMP.getName(),
startTxId, endTxId, timestamp);
}
/**
* Return the first readable finalized edits file for the given txid.
*/
File findFinalizedEditsFile(long startTxId, long endTxId)
throws IOException {
File ret = findFile(NameNodeDirType.EDITS,
getFinalizedEditsFileName(startTxId, endTxId));
if (ret == null) {
throw new IOException(
"No edits file for txid " + startTxId + "-" + endTxId + " exists!");
}
return ret;
}
/**
* Return the first readable image file for the given txid, or null
* if no such image can be found
*/
File findImageFile(long txid) {
return findFile(NameNodeDirType.IMAGE,
getImageFileName(txid));
}
/**
* Return the first readable storage file of the given name
* across any of the 'current' directories in SDs of the
* given type, or null if no such file exists.
*/
private File findFile(NameNodeDirType dirType, String name) {
for (StorageDirectory sd : dirIterable(dirType)) {
File candidate = new File(sd.getCurrentDir(), name);
if (FileUtil.canRead(sd.getCurrentDir()) &&
candidate.exists()) {
return candidate;
}
}
return null;
}
/**
* Disable the check for pre-upgradable layouts. Needed for BackupImage.
* @param val Whether to disable the preupgradeable layout check.
*/
void setDisablePreUpgradableLayoutCheck(boolean val) {
disablePreUpgradableLayoutCheck = val;
}
/**
* Marks a list of directories as having experienced an error.
*
* @param sds A list of storage directories to mark as errored.
* @throws IOException
*/
void reportErrorsOnDirectories(List<StorageDirectory> sds) {
for (StorageDirectory sd : sds) {
reportErrorsOnDirectory(sd);
}
}
/**
* Reports that a directory has experienced an error.
* Notifies listeners that the directory is no longer
* available.
*
* @param sd A storage directory to mark as errored.
* @throws IOException
*/
private void reportErrorsOnDirectory(StorageDirectory sd) {
LOG.error("Error reported on storage directory " + sd);
String lsd = listStorageDirectories();
LOG.debug("current list of storage dirs:" + lsd);
LOG.warn("About to remove corresponding storage: "
+ sd.getRoot().getAbsolutePath());
try {
sd.unlock();
} catch (Exception e) {
LOG.warn("Unable to unlock bad storage directory: "
+ sd.getRoot().getPath(), e);
}
if (this.storageDirs.remove(sd)) {
this.removedStorageDirs.add(sd);
}
lsd = listStorageDirectories();
LOG.debug("at the end current list of storage dirs:" + lsd);
}
/**
* Processes the startup options for the clusterid and blockpoolid
* for the upgrade.
* @param startOpt Startup options
* @param layoutVersion Layout version for the upgrade
* @throws IOException
*/
void processStartupOptionsForUpgrade(StartupOption startOpt, int layoutVersion)
throws IOException {
if (startOpt == StartupOption.UPGRADE) {
// If upgrade from a release that does not support federation,
// if clusterId is provided in the startupOptions use it.
// Else generate a new cluster ID
if (!LayoutVersion.supports(Feature.FEDERATION, layoutVersion)) {
if (startOpt.getClusterId() == null) {
startOpt.setClusterId(newClusterID());
}
setClusterID(startOpt.getClusterId());
setBlockPoolID(newBlockPoolID());
} else {
// Upgrade from one version of federation to another supported
// version of federation doesn't require clusterID.
// Warn the user if the current clusterid didn't match with the input
// clusterid.
if (startOpt.getClusterId() != null
&& !startOpt.getClusterId().equals(getClusterID())) {
LOG.warn("Clusterid mismatch - current clusterid: " + getClusterID()
+ ", Ignoring given clusterid: " + startOpt.getClusterId());
}
}
LOG.info("Using clusterid: " + getClusterID());
}
}
/**
* Report that an IOE has occurred on some file which may
* or may not be within one of the NN image storage directories.
*/
@Override
public void reportErrorOnFile(File f) {
// We use getAbsolutePath here instead of getCanonicalPath since we know
// that there is some IO problem on that drive.
// getCanonicalPath may need to call stat() or readlink() and it's likely
// those calls would fail due to the same underlying IO problem.
String absPath = f.getAbsolutePath();
for (StorageDirectory sd : storageDirs) {
String dirPath = sd.getRoot().getAbsolutePath();
if (!dirPath.endsWith(File.separator)) {
dirPath += File.separator;
}
if (absPath.startsWith(dirPath)) {
reportErrorsOnDirectory(sd);
return;
}
}
}
/**
* Generate new clusterID.
*
* clusterID is a persistent attribute of the cluster.
* It is generated when the cluster is created and remains the same
* during the life cycle of the cluster. When a new name node is formated, if
* this is a new cluster, a new clusterID is geneated and stored. Subsequent
* name node must be given the same ClusterID during its format to be in the
* same cluster.
* When a datanode register it receive the clusterID and stick with it.
* If at any point, name node or data node tries to join another cluster, it
* will be rejected.
*
* @return new clusterID
*/
public static String newClusterID() {
return "CID-" + UUID.randomUUID().toString();
}
void setClusterID(String cid) {
clusterID = cid;
}
/**
* try to find current cluster id in the VERSION files
* returns first cluster id found in any VERSION file
* null in case none found
* @return clusterId or null in case no cluster id found
*/
public String determineClusterId() {
String cid = null;
Iterator<StorageDirectory> sdit = dirIterator(NameNodeDirType.IMAGE);
while(sdit.hasNext()) {
StorageDirectory sd = sdit.next();
try {
Properties props = readPropertiesFile(sd.getVersionFile());
cid = props.getProperty("clusterID");
LOG.info("current cluster id for sd="+sd.getCurrentDir() +
";lv=" + layoutVersion + ";cid=" + cid);
if(cid != null && !cid.equals(""))
return cid;
} catch (Exception e) {
LOG.warn("this sd not available: " + e.getLocalizedMessage());
} //ignore
}
LOG.warn("couldn't find any VERSION file containing valid ClusterId");
return null;
}
/**
* Generate new blockpoolID.
*
* @return new blockpoolID
*/
static String newBlockPoolID() throws UnknownHostException{
String ip = "unknownIP";
try {
ip = DNS.getDefaultIP("default");
} catch (UnknownHostException e) {
LOG.warn("Could not find ip address of \"default\" inteface.");
throw e;
}
int rand = DFSUtil.getSecureRandom().nextInt(Integer.MAX_VALUE);
String bpid = "BP-" + rand + "-"+ ip + "-" + Time.now();
return bpid;
}
/** Validate and set block pool ID */
void setBlockPoolID(String bpid) {
blockpoolID = bpid;
}
/** 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.STORAGE_FILE_VERSION + " has no block pool Id.");
}
if (!blockpoolID.equals("") && !blockpoolID.equals(bpid)) {
throw new InconsistentFSStateException(storage,
"Unexepcted blockpoolID " + bpid + " . Expected " + blockpoolID);
}
setBlockPoolID(bpid);
}
public String getBlockPoolID() {
return blockpoolID;
}
/**
* Iterate over all current storage directories, inspecting them
* with the given inspector.
*/
void inspectStorageDirs(FSImageStorageInspector inspector)
throws IOException {
// Process each of the storage directories to find the pair of
// newest image file and edit file
for (Iterator<StorageDirectory> it = dirIterator(); it.hasNext();) {
StorageDirectory sd = it.next();
inspector.inspectDirectory(sd);
}
}
/**
* Iterate over all of the storage dirs, reading their contents to determine
* their layout versions. Returns an FSImageStorageInspector which has
* inspected each directory.
*
* <b>Note:</b> this can mutate the storage info fields (ctime, version, etc).
* @throws IOException if no valid storage dirs are found or no valid layout version
*/
FSImageStorageInspector readAndInspectDirs()
throws IOException {
Integer layoutVersion = null;
boolean multipleLV = false;
StringBuilder layoutVersions = new StringBuilder();
// First determine what range of layout versions we're going to inspect
for (Iterator<StorageDirectory> it = dirIterator();
it.hasNext();) {
StorageDirectory sd = it.next();
if (!sd.getVersionFile().exists()) {
FSImage.LOG.warn("Storage directory " + sd + " contains no VERSION file. Skipping...");
continue;
}
readProperties(sd); // sets layoutVersion
int lv = getLayoutVersion();
if (layoutVersion == null) {
layoutVersion = Integer.valueOf(lv);
} else if (!layoutVersion.equals(lv)) {
multipleLV = true;
}
layoutVersions.append("(").append(sd.getRoot()).append(", ").append(lv).append(") ");
}
if (layoutVersion == null) {
throw new IOException("No storage directories contained VERSION information");
}
if (multipleLV) {
throw new IOException(
"Storage directories contain multiple layout versions: "
+ layoutVersions);
}
// If the storage directories are with the new layout version
// (ie edits_<txnid>) then use the new inspector, which will ignore
// the old format dirs.
FSImageStorageInspector inspector;
if (LayoutVersion.supports(Feature.TXID_BASED_LAYOUT, getLayoutVersion())) {
inspector = new FSImageTransactionalStorageInspector();
} else {
inspector = new FSImagePreTransactionalStorageInspector();
}
inspectStorageDirs(inspector);
return inspector;
}
public NamespaceInfo getNamespaceInfo() {
return new NamespaceInfo(
getNamespaceID(),
getClusterID(),
getBlockPoolID(),
getCTime());
}
}