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

Class SnapshotFSImageFormat

java.lang.Object

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

public class SnapshotFSImageFormat
extends Object

A helper class defining static methods for reading/writing snapshot related information from/to FSImage.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	SnapshotFSImageFormat.ReferenceMap	A reference map for fsimage serialization.

Constructor Summary

Constructors

Constructor	Description
SnapshotFSImageFormat()

Method Summary

Modifier and Type	Method	Description
static INode	loadCreated(byte[] createdNodeName, INodeDirectory parent)	Load a node stored in the created list from fsimage.
static void	loadDirectoryDiffList(INodeDirectory dir, DataInput in, FSImageFormat.Loader loader)	Load the SnapshotDiff list for the INodeDirectoryWithSnapshot directory.
static FileDiffList	loadFileDiffList(DataInput in, FSImageFormat.Loader loader)
static void	loadSnapshotList(INodeDirectory snapshottableParent, int numSnapshots, DataInput in, FSImageFormat.Loader loader)	Load snapshots and snapshotQuota for a Snapshottable directory.
static void	saveDirectoryDiffList(INodeDirectory dir, DataOutput out, SnapshotFSImageFormat.ReferenceMap referenceMap)
static void	saveFileDiffList(INodeFile file, DataOutput out)
static void	saveSnapshots(INodeDirectory current, DataOutput out)	Save snapshots and snapshot quota for a snapshottable directory.

Methods inherited from class java.lang.Object

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

Constructor Details

SnapshotFSImageFormat

public SnapshotFSImageFormat()

Method Details

saveSnapshots

public static void saveSnapshots(INodeDirectory current,
 DataOutput out)
                          throws IOException

Save snapshots and snapshot quota for a snapshottable directory.

Parameters:

current - The directory that the snapshots belongs to.

out - The DataOutput to write.

Throws:

IOException

saveDirectoryDiffList

public static void saveDirectoryDiffList(INodeDirectory dir,
 DataOutput out,
 SnapshotFSImageFormat.ReferenceMap referenceMap)
                                  throws IOException

Throws:

IOException

saveFileDiffList

public static void saveFileDiffList(INodeFile file,
 DataOutput out)
                             throws IOException

Throws:

IOException

loadFileDiffList

public static FileDiffList loadFileDiffList(DataInput in,
 FSImageFormat.Loader loader)
                                     throws IOException

Throws:

IOException

loadCreated

public static INode loadCreated(byte[] createdNodeName,
 INodeDirectory parent)
                         throws IOException

Load a node stored in the created list from fsimage.

Parameters:

createdNodeName - The name of the created node.

parent - The directory that the created list belongs to.

Returns:

The created node.

Throws:

IOException

loadSnapshotList

public static void loadSnapshotList(INodeDirectory snapshottableParent,
 int numSnapshots,
 DataInput in,
 FSImageFormat.Loader loader)
                             throws IOException

Load snapshots and snapshotQuota for a Snapshottable directory.

Parameters:

snapshottableParent - The snapshottable directory for loading.

numSnapshots - The number of snapshots that the directory has.

loader - The loader

Throws:

IOException

loadDirectoryDiffList

public static void loadDirectoryDiffList(INodeDirectory dir,
 DataInput in,
 FSImageFormat.Loader loader)
                                  throws IOException

Load the SnapshotDiff list for the INodeDirectoryWithSnapshot directory.

Parameters:

dir - The snapshottable directory for loading.

in - The DataInput instance to read.

loader - The loader

Throws:

IOException