/// <summary>
/// Delete a path from the name space
/// Update the count at each ancestor directory with quota
/// <br />
/// Note: This is to be used by
/// <see cref="FSEditLog"/>
/// only.
/// <br />
/// </summary>
/// <param name="src">a string representation of a path to an inode</param>
/// <param name="mtime">the time the inode is removed</param>
/// <exception cref="System.IO.IOException"/>
internal static void DeleteForEditLog(FSDirectory fsd, string src, long mtime)
{
System.Diagnostics.Debug.Assert(fsd.HasWriteLock());
FSNamesystem fsn = fsd.GetFSNamesystem();
INode.BlocksMapUpdateInfo collectedBlocks = new INode.BlocksMapUpdateInfo();
IList <INode> removedINodes = new ChunkedArrayList <INode>();
INodesInPath iip = fsd.GetINodesInPath4Write(FSDirectory.NormalizePath(src), false
);
if (!DeleteAllowed(iip, src))
{
return;
}
IList <INodeDirectory> snapshottableDirs = new AList <INodeDirectory>();
FSDirSnapshotOp.CheckSnapshot(iip.GetLastINode(), snapshottableDirs);
long filesRemoved = UnprotectedDelete(fsd, iip, collectedBlocks, removedINodes, mtime
);
fsn.RemoveSnapshottableDirs(snapshottableDirs);
if (filesRemoved >= 0)
{
fsn.RemoveLeasesAndINodes(src, removedINodes, false);
fsn.RemoveBlocksAndUpdateSafemodeTotal(collectedBlocks);
}
}
/// <summary>Delete the target directory and collect the blocks under it</summary>
/// <param name="iip">the INodesInPath instance containing all the INodes for the path
/// </param>
/// <param name="collectedBlocks">Blocks under the deleted directory</param>
/// <param name="removedINodes">INodes that should be removed from inodeMap</param>
/// <returns>the number of files that have been removed</returns>
/// <exception cref="System.IO.IOException"/>
internal static long Delete(FSDirectory fsd, INodesInPath iip, INode.BlocksMapUpdateInfo
collectedBlocks, IList <INode> removedINodes, long mtime)
{
if (NameNode.stateChangeLog.IsDebugEnabled())
{
NameNode.stateChangeLog.Debug("DIR* FSDirectory.delete: " + iip.GetPath());
}
long filesRemoved;
fsd.WriteLock();
try
{
if (!DeleteAllowed(iip, iip.GetPath()))
{
filesRemoved = -1;
}
else
{
IList <INodeDirectory> snapshottableDirs = new AList <INodeDirectory>();
FSDirSnapshotOp.CheckSnapshot(iip.GetLastINode(), snapshottableDirs);
filesRemoved = UnprotectedDelete(fsd, iip, collectedBlocks, removedINodes, mtime);
fsd.GetFSNamesystem().RemoveSnapshottableDirs(snapshottableDirs);
}
}
finally
{
fsd.WriteUnlock();
}
return(filesRemoved);
}
/// <exception cref="System.IO.IOException"/>
private static void ValidateRenameSource(INodesInPath srcIIP)
{
string error;
INode srcInode = srcIIP.GetLastINode();
// validate source
if (srcInode == null)
{
error = "rename source " + srcIIP.GetPath() + " is not found.";
NameNode.stateChangeLog.Warn("DIR* FSDirectory.unprotectedRenameTo: " + error);
throw new FileNotFoundException(error);
}
if (srcIIP.Length() == 1)
{
error = "rename source cannot be the root";
NameNode.stateChangeLog.Warn("DIR* FSDirectory.unprotectedRenameTo: " + error);
throw new IOException(error);
}
// srcInode and its subtree cannot contain snapshottable directories with
// snapshots
FSDirSnapshotOp.CheckSnapshot(srcInode, null);
}
/// <summary>Rename src to dst.</summary>
/// <remarks>
/// Rename src to dst.
/// See
/// <see cref="Org.Apache.Hadoop.Hdfs.DistributedFileSystem.Rename(Org.Apache.Hadoop.FS.Path, Org.Apache.Hadoop.FS.Path, Org.Apache.Hadoop.FS.Options.Rename[])
/// "/>
/// for details related to rename semantics and exceptions.
/// </remarks>
/// <param name="fsd">FSDirectory</param>
/// <param name="src">source path</param>
/// <param name="dst">destination path</param>
/// <param name="timestamp">modification time</param>
/// <param name="collectedBlocks">blocks to be removed</param>
/// <param name="options">Rename options</param>
/// <returns>whether a file/directory gets overwritten in the dst path</returns>
/// <exception cref="System.IO.IOException"/>
internal static bool UnprotectedRenameTo(FSDirectory fsd, string src, string dst,
INodesInPath srcIIP, INodesInPath dstIIP, long timestamp, INode.BlocksMapUpdateInfo
collectedBlocks, params Options.Rename[] options)
{
System.Diagnostics.Debug.Assert(fsd.HasWriteLock());
bool overwrite = options != null && Arrays.AsList(options).Contains(Options.Rename
.Overwrite);
string error;
INode srcInode = srcIIP.GetLastINode();
ValidateRenameSource(srcIIP);
// validate the destination
if (dst.Equals(src))
{
throw new FileAlreadyExistsException("The source " + src + " and destination " +
dst + " are the same");
}
ValidateDestination(src, dst, srcInode);
if (dstIIP.Length() == 1)
{
error = "rename destination cannot be the root";
NameNode.stateChangeLog.Warn("DIR* FSDirectory.unprotectedRenameTo: " + error);
throw new IOException(error);
}
BlockStoragePolicySuite bsps = fsd.GetBlockStoragePolicySuite();
fsd.ezManager.CheckMoveValidity(srcIIP, dstIIP, src);
INode dstInode = dstIIP.GetLastINode();
IList <INodeDirectory> snapshottableDirs = new AList <INodeDirectory>();
if (dstInode != null)
{
// Destination exists
ValidateOverwrite(src, dst, overwrite, srcInode, dstInode);
FSDirSnapshotOp.CheckSnapshot(dstInode, snapshottableDirs);
}
INode dstParent = dstIIP.GetINode(-2);
if (dstParent == null)
{
error = "rename destination parent " + dst + " not found.";
NameNode.stateChangeLog.Warn("DIR* FSDirectory.unprotectedRenameTo: " + error);
throw new FileNotFoundException(error);
}
if (!dstParent.IsDirectory())
{
error = "rename destination parent " + dst + " is a file.";
NameNode.stateChangeLog.Warn("DIR* FSDirectory.unprotectedRenameTo: " + error);
throw new ParentNotDirectoryException(error);
}
// Ensure dst has quota to accommodate rename
VerifyFsLimitsForRename(fsd, srcIIP, dstIIP);
VerifyQuotaForRename(fsd, srcIIP, dstIIP);
FSDirRenameOp.RenameOperation tx = new FSDirRenameOp.RenameOperation(fsd, src, dst
, srcIIP, dstIIP);
bool undoRemoveSrc = true;
tx.RemoveSrc();
bool undoRemoveDst = false;
long removedNum = 0;
try
{
if (dstInode != null)
{
// dst exists, remove it
removedNum = tx.RemoveDst();
if (removedNum != -1)
{
undoRemoveDst = true;
}
}
// add src as dst to complete rename
if (tx.AddSourceToDestination())
{
undoRemoveSrc = false;
if (NameNode.stateChangeLog.IsDebugEnabled())
{
NameNode.stateChangeLog.Debug("DIR* FSDirectory.unprotectedRenameTo: " + src + " is renamed to "
+ dst);
}
tx.UpdateMtimeAndLease(timestamp);
// Collect the blocks and remove the lease for previous dst
bool filesDeleted = false;
if (undoRemoveDst)
{
undoRemoveDst = false;
if (removedNum > 0)
{
filesDeleted = tx.CleanDst(bsps, collectedBlocks);
}
}
if (snapshottableDirs.Count > 0)
{
// There are snapshottable directories (without snapshots) to be
// deleted. Need to update the SnapshotManager.
fsd.GetFSNamesystem().RemoveSnapshottableDirs(snapshottableDirs);
}
tx.UpdateQuotasInSourceTree(bsps);
return(filesDeleted);
}
}
finally
{
if (undoRemoveSrc)
{
tx.RestoreSource();
}
if (undoRemoveDst)
{
// Rename failed - restore dst
tx.RestoreDst(bsps);
}
}
NameNode.stateChangeLog.Warn("DIR* FSDirectory.unprotectedRenameTo: " + "failed to rename "
+ src + " to " + dst);
throw new IOException("rename from " + src + " to " + dst + " failed.");
}
