/// <summary>Load the snapshots section from fsimage.</summary>
/// <remarks>
/// Load the snapshots section from fsimage. Also add snapshottable feature
/// to snapshottable directories.
/// </remarks>
/// <exception cref="System.IO.IOException"/>
public void LoadSnapshotSection(InputStream @in)
{
SnapshotManager sm = fsn.GetSnapshotManager();
FsImageProto.SnapshotSection section = FsImageProto.SnapshotSection.ParseDelimitedFrom
(@in);
int snum = section.GetNumSnapshots();
sm.SetNumSnapshots(snum);
sm.SetSnapshotCounter(section.GetSnapshotCounter());
foreach (long sdirId in section.GetSnapshottableDirList())
{
INodeDirectory dir = fsDir.GetInode(sdirId).AsDirectory();
if (!dir.IsSnapshottable())
{
dir.AddSnapshottableFeature();
}
else
{
// dir is root, and admin set root to snapshottable before
dir.SetSnapshotQuota(DirectorySnapshottableFeature.SnapshotLimit);
}
sm.AddSnapshottable(dir);
}
LoadSnapshots(@in, snum);
}
/// <summary>Set the given snapshottable directory to non-snapshottable.</summary>
/// <exception cref="Org.Apache.Hadoop.Hdfs.Protocol.SnapshotException">if there are snapshots in the directory.
/// </exception>
/// <exception cref="System.IO.IOException"/>
public virtual void ResetSnapshottable(string path)
{
INodesInPath iip = fsdir.GetINodesInPath4Write(path);
INodeDirectory d = INodeDirectory.ValueOf(iip.GetLastINode(), path);
DirectorySnapshottableFeature sf = d.GetDirectorySnapshottableFeature();
if (sf == null)
{
// the directory is already non-snapshottable
return;
}
if (sf.GetNumSnapshots() > 0)
{
throw new SnapshotException("The directory " + path + " has snapshot(s). " + "Please redo the operation after removing all the snapshots."
);
}
if (d == fsdir.GetRoot())
{
d.SetSnapshotQuota(0);
}
else
{
d.RemoveSnapshottableFeature();
}
RemoveSnapshottable(d);
}
/// <summary>Load snapshots and snapshotQuota for a Snapshottable directory.</summary>
/// <param name="snapshottableParent">The snapshottable directory for loading.</param>
/// <param name="numSnapshots">The number of snapshots that the directory has.</param>
/// <param name="loader">The loader</param>
/// <exception cref="System.IO.IOException"/>
public static void LoadSnapshotList(INodeDirectory snapshottableParent, int numSnapshots
, DataInput @in, FSImageFormat.Loader loader)
{
DirectorySnapshottableFeature sf = snapshottableParent.GetDirectorySnapshottableFeature
();
Preconditions.CheckArgument(sf != null);
for (int i = 0; i < numSnapshots; i++)
{
// read snapshots
Org.Apache.Hadoop.Hdfs.Server.Namenode.Snapshot.Snapshot s = loader.GetSnapshot(@in
);
s.GetRoot().SetParent(snapshottableParent);
sf.AddSnapshot(s);
}
int snapshotQuota = @in.ReadInt();
snapshottableParent.SetSnapshotQuota(snapshotQuota);
}
/// <summary>Set the given directory as a snapshottable directory.</summary>
/// <remarks>
/// Set the given directory as a snapshottable directory.
/// If the path is already a snapshottable directory, update the quota.
/// </remarks>
/// <exception cref="System.IO.IOException"/>
public virtual void SetSnapshottable(string path, bool checkNestedSnapshottable)
{
INodesInPath iip = fsdir.GetINodesInPath4Write(path);
INodeDirectory d = INodeDirectory.ValueOf(iip.GetLastINode(), path);
if (checkNestedSnapshottable)
{
CheckNestedSnapshottable(d, path);
}
if (d.IsSnapshottable())
{
//The directory is already a snapshottable directory.
d.SetSnapshotQuota(DirectorySnapshottableFeature.SnapshotLimit);
}
else
{
d.AddSnapshottableFeature();
}
AddSnapshottable(d);
}
