/// <exception cref="System.IO.IOException"/>
private static FileDiff LoadFileDiff(FileDiff posterior, DataInput @in, FSImageFormat.Loader
loader)
{
// 1. Read the id of the Snapshot root to identify the Snapshot
Org.Apache.Hadoop.Hdfs.Server.Namenode.Snapshot.Snapshot snapshot = loader.GetSnapshot
(@in);
// 2. Load file size
long fileSize = @in.ReadLong();
// 3. Load snapshotINode
INodeFileAttributes snapshotINode = @in.ReadBoolean() ? loader.LoadINodeFileAttributes
(@in) : null;
return(new FileDiff(snapshot.GetId(), snapshotINode, posterior, fileSize));
}
/// <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>
/// Load
/// <see cref="DirectoryDiff"/>
/// from fsimage.
/// </summary>
/// <param name="parent">The directory that the SnapshotDiff belongs to.</param>
/// <param name="in">
/// The
/// <see cref="System.IO.DataInput"/>
/// instance to read.
/// </param>
/// <param name="loader">
/// The
/// <see cref="Loader"/>
/// instance that this loading procedure is
/// using.
/// </param>
/// <returns>
/// A
/// <see cref="DirectoryDiff"/>
/// .
/// </returns>
/// <exception cref="System.IO.IOException"/>
private static DirectoryWithSnapshotFeature.DirectoryDiff LoadDirectoryDiff(INodeDirectory
parent, DataInput @in, FSImageFormat.Loader loader)
{
// 1. Read the full path of the Snapshot root to identify the Snapshot
Org.Apache.Hadoop.Hdfs.Server.Namenode.Snapshot.Snapshot snapshot = loader.GetSnapshot
(@in);
// 2. Load DirectoryDiff#childrenSize
int childrenSize = @in.ReadInt();
// 3. Load DirectoryDiff#snapshotINode
INodeDirectoryAttributes snapshotINode = LoadSnapshotINodeInDirectoryDiff(snapshot
, @in, loader);
// 4. Load the created list in SnapshotDiff#Diff
IList <INode> createdList = LoadCreatedList(parent, @in);
// 5. Load the deleted list in SnapshotDiff#Diff
IList <INode> deletedList = LoadDeletedList(parent, createdList, @in, loader);
// 6. Compose the SnapshotDiff
IList <DirectoryWithSnapshotFeature.DirectoryDiff> diffs = parent.GetDiffs().AsList
();
DirectoryWithSnapshotFeature.DirectoryDiff sdiff = new DirectoryWithSnapshotFeature.DirectoryDiff
(snapshot.GetId(), snapshotINode, diffs.IsEmpty() ? null : diffs[0], childrenSize
, createdList, deletedList, snapshotINode == snapshot.GetRoot());
return(sdiff);
}
