Package org.apache.hadoop.hdfs.server.namenode.snapshot

Class DirectoryWithSnapshotFeature

java.lang.Object

org.apache.hadoop.hdfs.server.namenode.snapshot.DirectoryWithSnapshotFeature

All Implemented Interfaces:

INode.Feature

Direct Known Subclasses:

DirectorySnapshottableFeature

@Private
public class DirectoryWithSnapshotFeature
extends Object
implements INode.Feature

Feature used to store and process the snapshot diff information for a directory. In particular, it contains a directory diff list recording changes made to the directory and its children for each snapshot.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	DirectoryWithSnapshotFeature.DirectoryDiff	The difference of an INodeDirectory between two snapshots.
static class	DirectoryWithSnapshotFeature.DirectoryDiffList	A list of directory diffs.

Constructor Summary

Constructors

Constructor	Description
DirectoryWithSnapshotFeature(DirectoryWithSnapshotFeature.DirectoryDiffList diffs)

Method Summary

Modifier and Type	Method	Description
boolean	addChild(INodeDirectory parent, INode inode, boolean setModTime, int latestSnapshotId)	Add an inode into parent's children list.
void	cleanDirectory(INode.ReclaimContext reclaimContext, INodeDirectory currentINode, int snapshot, int prior)
void	clear(INode.ReclaimContext reclaimContext, INodeDirectory currentINode)
void	computeContentSummary4Snapshot(BlockStoragePolicySuite bsps, ContentCounts counts)
QuotaCounts	computeQuotaUsage4CurrentDirectory(BlockStoragePolicySuite bsps, byte storagePolicyId)
static void	destroyDstSubtree(INode.ReclaimContext reclaimContext, INode inode, int snapshot, int prior)	Destroy a subtree under a DstReference node.
INode	getChild(INodeDirectory currentINode, byte[] name, int snapshotId)
ReadOnlyList<INode>	getChildrenList(INodeDirectory currentINode, int snapshotId)
DirectoryWithSnapshotFeature.DirectoryDiffList	getDiffs()
int	getLastSnapshotId()
void	getSnapshotDirectory(List<INodeDirectory> snapshotDir)	Get all the directories that are stored in some snapshot but not in the current children list.
boolean	removeChild(INodeDirectory parent, INode child, int latestSnapshotId)	Remove an inode from parent's children list.
INode	saveChild2Snapshot(INodeDirectory currentINode, INode child, int latestSnapshotId, INode snapshotCopy)	Used to record the modification of a symlink node
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

DirectoryWithSnapshotFeature

public DirectoryWithSnapshotFeature(DirectoryWithSnapshotFeature.DirectoryDiffList diffs)

Method Details

destroyDstSubtree

public static void destroyDstSubtree(INode.ReclaimContext reclaimContext,
 INode inode,
 int snapshot,
 int prior)

Destroy a subtree under a DstReference node.

getLastSnapshotId

public int getLastSnapshotId()

Returns:

the last snapshot.

getDiffs

public DirectoryWithSnapshotFeature.DirectoryDiffList getDiffs()

Returns:

the snapshot diff list.

getSnapshotDirectory

public void getSnapshotDirectory(List<INodeDirectory> snapshotDir)

Get all the directories that are stored in some snapshot but not in the current children list. These directories are equivalent to the directories stored in the deletes lists.

addChild

public boolean addChild(INodeDirectory parent,
 INode inode,
 boolean setModTime,
 int latestSnapshotId)

Add an inode into parent's children list. The caller of this method needs to make sure that parent is in the given snapshot "latest".

removeChild

public boolean removeChild(INodeDirectory parent,
 INode child,
 int latestSnapshotId)

Remove an inode from parent's children list. The caller of this method needs to make sure that parent is in the given snapshot "latest".

getChildrenList

public ReadOnlyList<INode> getChildrenList(INodeDirectory currentINode,
 int snapshotId)

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.

getChild

public INode getChild(INodeDirectory currentINode,
 byte[] name,
 int snapshotId)

saveChild2Snapshot

public INode saveChild2Snapshot(INodeDirectory currentINode,
 INode child,
 int latestSnapshotId,
 INode snapshotCopy)

Used to record the modification of a symlink node

clear

public void clear(INode.ReclaimContext reclaimContext,
 INodeDirectory currentINode)

computeQuotaUsage4CurrentDirectory

public QuotaCounts computeQuotaUsage4CurrentDirectory(BlockStoragePolicySuite bsps,
 byte storagePolicyId)

computeContentSummary4Snapshot

public void computeContentSummary4Snapshot(BlockStoragePolicySuite bsps,
 ContentCounts counts)
                                    throws org.apache.hadoop.security.AccessControlException

Throws:

org.apache.hadoop.security.AccessControlException

cleanDirectory

public void cleanDirectory(INode.ReclaimContext reclaimContext,
 INodeDirectory currentINode,
 int snapshot,
 int prior)

toString

public String toString()

Overrides:

toString in class Object