/// <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>
/// Test
/// <see cref="Snapshot.IdComparator"/>
/// .
/// </summary>
public virtual void TestIdCmp()
{
PermissionStatus perm = PermissionStatus.CreateImmutable("user", "group", FsPermission
.CreateImmutable((short)0));
INodeDirectory snapshottable = new INodeDirectory(0, DFSUtil.String2Bytes("foo"),
perm, 0L);
snapshottable.AddSnapshottableFeature();
Org.Apache.Hadoop.Hdfs.Server.Namenode.Snapshot.Snapshot[] snapshots = new Org.Apache.Hadoop.Hdfs.Server.Namenode.Snapshot.Snapshot
[] { new Org.Apache.Hadoop.Hdfs.Server.Namenode.Snapshot.Snapshot(1, "s1", snapshottable
), new Org.Apache.Hadoop.Hdfs.Server.Namenode.Snapshot.Snapshot(1, "s1", snapshottable
), new Org.Apache.Hadoop.Hdfs.Server.Namenode.Snapshot.Snapshot(2, "s2", snapshottable
), new Org.Apache.Hadoop.Hdfs.Server.Namenode.Snapshot.Snapshot(2, "s2", snapshottable
) };
NUnit.Framework.Assert.AreEqual(0, Org.Apache.Hadoop.Hdfs.Server.Namenode.Snapshot.Snapshot
.IdComparator.Compare(null, null));
foreach (Org.Apache.Hadoop.Hdfs.Server.Namenode.Snapshot.Snapshot s in snapshots)
{
NUnit.Framework.Assert.IsTrue(Org.Apache.Hadoop.Hdfs.Server.Namenode.Snapshot.Snapshot
.IdComparator.Compare(null, s) > 0);
NUnit.Framework.Assert.IsTrue(Org.Apache.Hadoop.Hdfs.Server.Namenode.Snapshot.Snapshot
.IdComparator.Compare(s, null) < 0);
foreach (Org.Apache.Hadoop.Hdfs.Server.Namenode.Snapshot.Snapshot t in snapshots)
{
int expected = string.CompareOrdinal(s.GetRoot().GetLocalName(), t.GetRoot().GetLocalName
());
int computed = Org.Apache.Hadoop.Hdfs.Server.Namenode.Snapshot.Snapshot.IdComparator
.Compare(s, t);
NUnit.Framework.Assert.AreEqual(expected > 0, computed > 0);
NUnit.Framework.Assert.AreEqual(expected == 0, computed == 0);
NUnit.Framework.Assert.AreEqual(expected < 0, computed < 0);
}
}
}
/// <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);
}