/*
* Finalize the block pool storage by deleting <BP>/previous directory
* that holds the snapshot.
*/
/// <exception cref="System.IO.IOException"/>
internal virtual void DoFinalize(FilePath dnCurDir)
{
FilePath bpRoot = GetBpRoot(blockpoolID, dnCurDir);
Storage.StorageDirectory bpSd = new Storage.StorageDirectory(bpRoot);
// block pool level previous directory
FilePath prevDir = bpSd.GetPreviousDir();
if (!prevDir.Exists())
{
return;
}
// already finalized
string dataDirPath = bpSd.GetRoot().GetCanonicalPath();
Log.Info("Finalizing upgrade for storage directory " + dataDirPath + ".\n cur LV = "
+ this.GetLayoutVersion() + "; cur CTime = " + this.GetCTime());
System.Diagnostics.Debug.Assert(bpSd.GetCurrentDir().Exists(), "Current directory must exist."
);
// rename previous to finalized.tmp
FilePath tmpDir = bpSd.GetFinalizedTmp();
Rename(prevDir, tmpDir);
// delete finalized.tmp dir in a separate thread
new Daemon(new _Runnable_618(tmpDir, dataDirPath)).Start();
}
/// <summary>Upgrade to any release after 0.22 (0.22 included) release e.g.</summary>
/// <remarks>
/// 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 <SD>/current/<bpid>/previous exists then delete it</li>
/// <li>Rename <SD>/current/<bpid>/current to
/// <SD>/current/bpid/current/previous.tmp</li>
/// <li>Create new <SD>current/<bpid>/current directory</li>
/// <ol>
/// <li>Hard links for block files are created from previous.tmp to current</li>
/// <li>Save new version file in current directory</li>
/// </ol>
/// <li>Rename previous.tmp to previous</li> </ol>
/// </remarks>
/// <param name="bpSd">storage directory <SD>/current/<bpid></param>
/// <param name="nsInfo">Namespace Info from the namenode</param>
/// <exception cref="System.IO.IOException">on error</exception>
internal virtual void DoUpgrade(DataNode datanode, Storage.StorageDirectory bpSd,
NamespaceInfo nsInfo)
{
// Upgrading is applicable only to release with federation or after
if (!DataNodeLayoutVersion.Supports(LayoutVersion.Feature.Federation, layoutVersion
))
{
return;
}
Log.Info("Upgrading block pool storage directory " + bpSd.GetRoot() + ".\n old LV = "
+ this.GetLayoutVersion() + "; old CTime = " + this.GetCTime() + ".\n new LV = "
+ HdfsConstants.DatanodeLayoutVersion + "; new CTime = " + nsInfo.GetCTime());
// get <SD>/previous directory
string dnRoot = GetDataNodeStorageRoot(bpSd.GetRoot().GetCanonicalPath());
Storage.StorageDirectory dnSdStorage = new Storage.StorageDirectory(new FilePath(
dnRoot));
FilePath dnPrevDir = dnSdStorage.GetPreviousDir();
// If <SD>/previous directory exists delete it
if (dnPrevDir.Exists())
{
DeleteDir(dnPrevDir);
}
FilePath bpCurDir = bpSd.GetCurrentDir();
FilePath bpPrevDir = bpSd.GetPreviousDir();
System.Diagnostics.Debug.Assert(bpCurDir.Exists(), "BP level current directory must exist."
);
CleanupDetachDir(new FilePath(bpCurDir, DataStorage.StorageDirDetached));
// 1. Delete <SD>/current/<bpid>/previous dir before upgrading
if (bpPrevDir.Exists())
{
DeleteDir(bpPrevDir);
}
FilePath bpTmpDir = bpSd.GetPreviousTmp();
System.Diagnostics.Debug.Assert(!bpTmpDir.Exists(), "previous.tmp directory must not exist."
);
// 2. Rename <SD>/current/<bpid>/current to
// <SD>/current/<bpid>/previous.tmp
Rename(bpCurDir, bpTmpDir);
// 3. Create new <SD>/current with block files hardlinks and VERSION
LinkAllBlocks(datanode, bpTmpDir, bpCurDir);
this.layoutVersion = HdfsConstants.DatanodeLayoutVersion;
System.Diagnostics.Debug.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 block pool " + blockpoolID + " at " + bpSd.GetRoot() + " is complete"
);
}
/* Flag if there is at least one storage dir that doesn't contain the newest
* fstime */
/* Flag set false if there are any "previous" directories found */
// Track the name and edits dir with the latest times
/// <exception cref="System.IO.IOException"/>
internal override void InspectDirectory(Storage.StorageDirectory sd)
{
// Was the file just formatted?
if (!sd.GetVersionFile().Exists())
{
hasOutOfDateStorageDirs = true;
return;
}
bool imageExists = false;
bool editsExists = false;
// Determine if sd is image, edits or both
if (sd.GetStorageDirType().IsOfType(NNStorage.NameNodeDirType.Image))
{
imageExists = NNStorage.GetStorageFile(sd, NNStorage.NameNodeFile.Image).Exists();
imageDirs.AddItem(sd.GetRoot().GetCanonicalPath());
}
if (sd.GetStorageDirType().IsOfType(NNStorage.NameNodeDirType.Edits))
{
editsExists = NNStorage.GetStorageFile(sd, NNStorage.NameNodeFile.Edits).Exists();
editsDirs.AddItem(sd.GetRoot().GetCanonicalPath());
}
long checkpointTime = ReadCheckpointTime(sd);
checkpointTimes.AddItem(checkpointTime);
if (sd.GetStorageDirType().IsOfType(NNStorage.NameNodeDirType.Image) && (latestNameCheckpointTime
< checkpointTime) && imageExists)
{
latestNameCheckpointTime = checkpointTime;
latestNameSD = sd;
}
if (sd.GetStorageDirType().IsOfType(NNStorage.NameNodeDirType.Edits) && (latestEditsCheckpointTime
< checkpointTime) && editsExists)
{
latestEditsCheckpointTime = checkpointTime;
latestEditsSD = sd;
}
// check that we have a valid, non-default checkpointTime
if (checkpointTime <= 0L)
{
hasOutOfDateStorageDirs = true;
}
// set finalized flag
isUpgradeFinalized = isUpgradeFinalized && !sd.GetPreviousDir().Exists();
}
/// <summary>
/// Rename the existing current dir to previous.tmp, and create a new empty
/// current dir.
/// </summary>
/// <exception cref="System.IO.IOException"/>
public static void RenameCurToTmp(Storage.StorageDirectory sd)
{
FilePath curDir = sd.GetCurrentDir();
FilePath prevDir = sd.GetPreviousDir();
FilePath tmpDir = sd.GetPreviousTmp();
Preconditions.CheckState(curDir.Exists(), "Current directory must exist for preupgrade."
);
Preconditions.CheckState(!prevDir.Exists(), "Previous directory must not exist for preupgrade."
);
Preconditions.CheckState(!tmpDir.Exists(), "Previous.tmp directory must not exist for preupgrade."
+ "Consider restarting for recovery.");
// rename current to tmp
NNStorage.Rename(curDir, tmpDir);
if (!curDir.Mkdir())
{
throw new IOException("Cannot create directory " + curDir);
}
}
/*
* 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>
*/
/// <exception cref="System.IO.IOException"/>
internal virtual void DoRollback(Storage.StorageDirectory bpSd, NamespaceInfo nsInfo
)
{
FilePath prevDir = bpSd.GetPreviousDir();
// regular startup if previous dir does not exist
if (!prevDir.Exists())
{
return;
}
// read attributes out of the VERSION file of previous directory
Org.Apache.Hadoop.Hdfs.Server.Datanode.BlockPoolSliceStorage prevInfo = new Org.Apache.Hadoop.Hdfs.Server.Datanode.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() >= HdfsConstants.DatanodeLayoutVersion && 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 = "
+ HdfsConstants.DatanodeLayoutVersion + " CTime = " + nsInfo.GetCTime());
}
Log.Info("Rolling back storage directory " + bpSd.GetRoot() + ".\n target LV = "
+ nsInfo.GetLayoutVersion() + "; target CTime = " + nsInfo.GetCTime());
FilePath tmpDir = bpSd.GetRemovedTmp();
System.Diagnostics.Debug.Assert(!tmpDir.Exists(), "removed.tmp directory must not exist."
);
// 1. rename current to tmp
FilePath curDir = bpSd.GetCurrentDir();
System.Diagnostics.Debug.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 " + bpSd.GetRoot() + " is complete");
}
/// <summary>Finalize the upgrade.</summary>
/// <remarks>
/// Finalize the upgrade. The previous dir, if any, will be renamed and
/// removed. After this is completed, rollback is no longer allowed.
/// </remarks>
/// <param name="sd">the storage directory to finalize</param>
/// <exception cref="System.IO.IOException">in the event of error</exception>
internal static void DoFinalize(Storage.StorageDirectory sd)
{
FilePath prevDir = sd.GetPreviousDir();
if (!prevDir.Exists())
{
// already discarded
Log.Info("Directory " + prevDir + " does not exist.");
Log.Info("Finalize upgrade for " + sd.GetRoot() + " is not required.");
return;
}
Log.Info("Finalizing upgrade of storage directory " + sd.GetRoot());
Preconditions.CheckState(sd.GetCurrentDir().Exists(), "Current directory must exist."
);
FilePath tmpDir = sd.GetFinalizedTmp();
// rename previous to tmp and remove
NNStorage.Rename(prevDir, tmpDir);
NNStorage.DeleteDir(tmpDir);
Log.Info("Finalize upgrade for " + sd.GetRoot() + " is complete.");
}
/// <summary>Perform the upgrade of the storage dir to the given storage info.</summary>
/// <remarks>
/// Perform the upgrade of the storage dir to the given storage info. The new
/// storage info is written into the current directory, and the previous.tmp
/// directory is renamed to previous.
/// </remarks>
/// <param name="sd">the storage directory to upgrade</param>
/// <param name="storage">info about the new upgraded versions.</param>
/// <exception cref="System.IO.IOException">in the event of error</exception>
public static void DoUpgrade(Storage.StorageDirectory sd, Storage storage)
{
Log.Info("Performing upgrade of storage directory " + sd.GetRoot());
try
{
// Write the version file, since saveFsImage only makes the
// fsimage_<txid>, and the directory is otherwise empty.
storage.WriteProperties(sd);
FilePath prevDir = sd.GetPreviousDir();
FilePath tmpDir = sd.GetPreviousTmp();
Preconditions.CheckState(!prevDir.Exists(), "previous directory must not exist for upgrade."
);
Preconditions.CheckState(tmpDir.Exists(), "previous.tmp directory must exist for upgrade."
);
// rename tmp to previous
NNStorage.Rename(tmpDir, prevDir);
}
catch (IOException ioe)
{
Log.Error("Unable to rename temp to previous for " + sd.GetRoot(), ioe);
throw;
}
}
/// <summary>
/// Return true if this storage dir can roll back to the previous storage
/// state, false otherwise.
/// </summary>
/// <remarks>
/// Return true if this storage dir can roll back to the previous storage
/// state, false otherwise. The NN will refuse to run the rollback operation
/// unless at least one JM or fsimage storage directory can roll back.
/// </remarks>
/// <param name="storage">the storage info for the current state</param>
/// <param name="prevStorage">the storage info for the previous (unupgraded) state</param>
/// <param name="targetLayoutVersion">the layout version we intend to roll back to</param>
/// <returns>true if this JM can roll back, false otherwise.</returns>
/// <exception cref="System.IO.IOException">in the event of error</exception>
internal static bool CanRollBack(Storage.StorageDirectory sd, StorageInfo storage
, StorageInfo prevStorage, int targetLayoutVersion)
{
FilePath prevDir = sd.GetPreviousDir();
if (!prevDir.Exists())
{
// use current directory then
Log.Info("Storage directory " + sd.GetRoot() + " does not contain previous fs state."
);
// read and verify consistency with other directories
storage.ReadProperties(sd);
return(false);
}
// read and verify consistency of the prev dir
prevStorage.ReadPreviousVersionProperties(sd);
if (prevStorage.GetLayoutVersion() != targetLayoutVersion)
{
throw new IOException("Cannot rollback to storage version " + prevStorage.GetLayoutVersion
() + " using this version of the NameNode, which uses storage version " + targetLayoutVersion
+ ". " + "Please use the previous version of HDFS to perform the rollback.");
}
return(true);
}
/// <summary>Perform rollback of the storage dir to the previous state.</summary>
/// <remarks>
/// Perform rollback of the storage dir to the previous state. The existing
/// current dir is removed, and the previous dir is renamed to current.
/// </remarks>
/// <param name="sd">the storage directory to roll back.</param>
/// <exception cref="System.IO.IOException">in the event of error</exception>
internal static void DoRollBack(Storage.StorageDirectory sd)
{
FilePath prevDir = sd.GetPreviousDir();
if (!prevDir.Exists())
{
return;
}
FilePath tmpDir = sd.GetRemovedTmp();
Preconditions.CheckState(!tmpDir.Exists(), "removed.tmp directory must not exist for rollback."
+ "Consider restarting for recovery.");
// rename current to tmp
FilePath curDir = sd.GetCurrentDir();
Preconditions.CheckState(curDir.Exists(), "Current directory must exist for rollback."
);
NNStorage.Rename(curDir, tmpDir);
// rename previous to current
NNStorage.Rename(prevDir, curDir);
// delete tmp dir
NNStorage.DeleteDir(tmpDir);
Log.Info("Rollback of " + sd.GetRoot() + " is complete.");
}
/// <summary>
/// Analyze whether a transition of the BP state is required and
/// perform it if necessary.
/// </summary>
/// <remarks>
/// 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
/// </remarks>
/// <param name="sd">storage directory <SD>/current/<bpid></param>
/// <param name="nsInfo">namespace info</param>
/// <param name="startOpt">startup option</param>
/// <exception cref="System.IO.IOException"/>
private void DoTransition(DataNode datanode, Storage.StorageDirectory sd, NamespaceInfo
nsInfo, HdfsServerConstants.StartupOption startOpt)
{
if (startOpt == HdfsServerConstants.StartupOption.Rollback && sd.GetPreviousDir()
.Exists())
{
Preconditions.CheckState(!GetTrashRootDir(sd).Exists(), sd.GetPreviousDir() + " and "
+ GetTrashRootDir(sd) + " should not " + " both be present.");
DoRollback(sd, nsInfo);
}
else
{
// rollback if applicable
if (startOpt == HdfsServerConstants.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 " + restored + " block files from trash.");
}
}
ReadProperties(sd);
CheckVersionUpgradable(this.layoutVersion);
System.Diagnostics.Debug.Assert(this.layoutVersion >= HdfsConstants.DatanodeLayoutVersion
, "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 == HdfsConstants.DatanodeLayoutVersion && this.cTime == nsInfo
.GetCTime())
{
return;
}
// regular startup
if (this.layoutVersion > HdfsConstants.DatanodeLayoutVersion)
{
int restored = RestoreBlockFilesFromTrash(GetTrashRootDir(sd));
Log.Info("Restored " + restored + " block files from trash " + "before the layout upgrade. These blocks will be moved to "
+ "the previous directory during the upgrade");
}
if (this.layoutVersion > HdfsConstants.DatanodeLayoutVersion || this.cTime < nsInfo
.GetCTime())
{
DoUpgrade(datanode, sd, nsInfo);
// upgrade
return;
}
// 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());
}
/// <exception cref="System.IO.IOException"/>
internal override void InspectDirectory(Storage.StorageDirectory sd)
{
// Was the directory just formatted?
if (!sd.GetVersionFile().Exists())
{
Log.Info("No version file in " + sd.GetRoot());
needToSave |= true;
return;
}
// Check for a seen_txid file, which marks a minimum transaction ID that
// must be included in our load plan.
try
{
maxSeenTxId = Math.Max(maxSeenTxId, NNStorage.ReadTransactionIdFile(sd));
}
catch (IOException ioe)
{
Log.Warn("Unable to determine the max transaction ID seen by " + sd, ioe);
return;
}
FilePath currentDir = sd.GetCurrentDir();
FilePath[] filesInStorage;
try
{
filesInStorage = FileUtil.ListFiles(currentDir);
}
catch (IOException ioe)
{
Log.Warn("Unable to inspect storage directory " + currentDir, ioe);
return;
}
foreach (FilePath f in filesInStorage)
{
Log.Debug("Checking file " + f);
string name = f.GetName();
// Check for fsimage_*
Matcher imageMatch = this.MatchPattern(name);
if (imageMatch != null)
{
if (sd.GetStorageDirType().IsOfType(NNStorage.NameNodeDirType.Image))
{
try
{
long txid = long.Parse(imageMatch.Group(1));
foundImages.AddItem(new FSImageStorageInspector.FSImageFile(sd, f, txid));
}
catch (FormatException)
{
Log.Error("Image file " + f + " has improperly formatted " + "transaction ID");
}
}
else
{
// skip
Log.Warn("Found image file at " + f + " but storage directory is " + "not configured to contain images."
);
}
}
}
// set finalized flag
isUpgradeFinalized = isUpgradeFinalized && !sd.GetPreviousDir().Exists();
}