| Interface | Description | 
|---|---|
| SnapshotStatsMXBean | This is an interface used to retrieve statistic information related to
 snapshots | 
| Class | Description | 
|---|---|
| DirectoryWithSnapshotFeature.DirectoryDiff | The difference of an  INodeDirectorybetween two snapshots. | 
| DirectoryWithSnapshotFeature.DirectoryDiffList | A list of directory diffs. | 
| FileDiff | The difference of an  INodeFilebetween two snapshots. | 
| FileDiffList | A list of FileDiffs for storing snapshot data. | 
| FSImageFormatPBSnapshot.Loader | Loading snapshot related information from protobuf based FSImage | 
| FSImageFormatPBSnapshot.Saver | Saving snapshot related information to protobuf based FSImage | 
| Snapshot.Root | The root directory of the snapshot. | 
| SnapshotFSImageFormat | A helper class defining static methods for reading/writing snapshot related
 information from/to FSImage. | 
| SnapshotFSImageFormat.ReferenceMap | A reference map for fsimage serialization. | 
| SnapshotManager | Manage snapshottable directories and their snapshots. | 
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