| Interface | Description | 
|---|---|
| LayoutVersion.LayoutFeature | The interface to be implemented by NameNode and DataNode layout features | 
| Class | Description | 
|---|---|
| BlockListAsLongs.Builder | |
| FSConstants | Deprecated Please use  HdfsConstants. | 
| LayoutVersion.FeatureInfo | Feature information. | 
| SnapshotInfo.Bean | 
| Enum | Description | 
|---|---|
| LayoutVersion.Feature | Enums for features that change the layout version before rolling
 upgrade is supported. | 
| Exception | Description | 
|---|---|
| FSLimitException.MaxDirectoryItemsExceededException | Directory has too many items | 
| FSLimitException.PathComponentTooLongException | Path component length is too long | 
| SnapshotException | Snapshot related exception. | 
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