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

static class

SnapshotFSImageFormat.ReferenceMap A reference map for fsimage serialization.

Constructor Summary

SnapshotFSImageFormat()

Method Summary

static void	loadDirectoryDiffList(INodeDirectory dir, DataInput in, FSImageFormat.Loader loader) Load the SnapshotDiff list for the INodeDirectoryWithSnapshot directory.
static FileWithSnapshot.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.
static void	saveDirectoryDiffList(INodeDirectory dir, DataOutput out, SnapshotFSImageFormat.ReferenceMap referenceMap)
static void	saveFileDiffList(org.apache.hadoop.hdfs.server.namenode.INodeFile file, DataOutput out)
static void	saveSnapshots(org.apache.hadoop.hdfs.server.namenode.snapshot.INodeDirectorySnapshottable 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 Detail

SnapshotFSImageFormat

public SnapshotFSImageFormat()

Method Detail

saveSnapshots

public static void saveSnapshots(org.apache.hadoop.hdfs.server.namenode.snapshot.INodeDirectorySnapshottable 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(org.apache.hadoop.hdfs.server.namenode.INodeFile file,
                                    DataOutput out)
                             throws IOException

Throws:

IOException

loadFileDiffList

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

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.

in - The DataInput instance to read.

loader - The FSImageFormat.Loader instance that this loading procedure is using.

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 FSImageFormat.Loader instance that this loading procedure is using.

Throws:

IOException