/// <returns>
/// If there is no corresponding directory diff for the given
/// snapshot, this means that the current children list should be
/// returned for the snapshot. Otherwise we calculate the children list
/// for the snapshot and return it.
/// </returns>
public virtual ReadOnlyList <INode> GetChildrenList(INodeDirectory currentINode, int
snapshotId)
{
DirectoryWithSnapshotFeature.DirectoryDiff diff = diffs.GetDiffById(snapshotId);
return(diff != null?diff.GetChildrenList(currentINode) : currentINode.GetChildrenList
(Org.Apache.Hadoop.Hdfs.Server.Namenode.Snapshot.Snapshot.CurrentStateId));
}
/// <summary>Destroy a subtree under a DstReference node.</summary>
/// <exception cref="Org.Apache.Hadoop.Hdfs.Protocol.QuotaExceededException"/>
public static void DestroyDstSubtree(BlockStoragePolicySuite bsps, INode inode, int
snapshot, int prior, INode.BlocksMapUpdateInfo collectedBlocks, IList <INode> removedINodes
)
{
Preconditions.CheckArgument(prior != Org.Apache.Hadoop.Hdfs.Server.Namenode.Snapshot.Snapshot
.NoSnapshotId);
if (inode.IsReference())
{
if (inode is INodeReference.WithName && snapshot != Org.Apache.Hadoop.Hdfs.Server.Namenode.Snapshot.Snapshot
.CurrentStateId)
{
// this inode has been renamed before the deletion of the DstReference
// subtree
inode.CleanSubtree(bsps, snapshot, prior, collectedBlocks, removedINodes);
}
else
{
// for DstReference node, continue this process to its subtree
DestroyDstSubtree(bsps, inode.AsReference().GetReferredINode(), snapshot, prior,
collectedBlocks, removedINodes);
}
}
else
{
if (inode.IsFile())
{
inode.CleanSubtree(bsps, snapshot, prior, collectedBlocks, removedINodes);
}
else
{
if (inode.IsDirectory())
{
IDictionary <INode, INode> excludedNodes = null;
INodeDirectory dir = inode.AsDirectory();
DirectoryWithSnapshotFeature sf = dir.GetDirectoryWithSnapshotFeature();
if (sf != null)
{
DirectoryWithSnapshotFeature.DirectoryDiffList diffList = sf.GetDiffs();
DirectoryWithSnapshotFeature.DirectoryDiff priorDiff = diffList.GetDiffById(prior
);
if (priorDiff != null && priorDiff.GetSnapshotId() == prior)
{
IList <INode> dList = priorDiff.diff.GetList(Diff.ListType.Deleted);
excludedNodes = CloneDiffList(dList);
}
if (snapshot != Org.Apache.Hadoop.Hdfs.Server.Namenode.Snapshot.Snapshot.CurrentStateId)
{
diffList.DeleteSnapshotDiff(bsps, snapshot, prior, dir, collectedBlocks, removedINodes
);
}
priorDiff = diffList.GetDiffById(prior);
if (priorDiff != null && priorDiff.GetSnapshotId() == prior)
{
priorDiff.diff.DestroyCreatedList(bsps, dir, collectedBlocks, removedINodes);
}
}
foreach (INode child in inode.AsDirectory().GetChildrenList(prior))
{
if (excludedNodes != null && excludedNodes.Contains(child))
{
continue;
}
DestroyDstSubtree(bsps, child, snapshot, prior, collectedBlocks, removedINodes);
}
}
}
}
}