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

Constructor Summary

Constructors

Constructor and Description
SnapshotFSImageFormat()

Method Summary

Methods

Modifier and Type	Method and Description
static org.apache.hadoop.hdfs.server.namenode.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(org.apache.hadoop.hdfs.server.namenode.snapshot.INodeDirectorySnapshottable snapshottableParent, int numSnapshots, DataInput in, FSImageFormat.Loader loader) Load snapshots and snapshotQuota for a Snapshottable directory.

Methods inherited from class java.lang.Object

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

Constructor Detail

SnapshotFSImageFormat

public SnapshotFSImageFormat()

Method Detail

loadFileDiffList

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

Throws:

IOException

loadCreated

public static org.apache.hadoop.hdfs.server.namenode.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(org.apache.hadoop.hdfs.server.namenode.snapshot.INodeDirectorySnapshottable 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