See: Description
| Class | Description | 
|---|---|
| AddErasureCodingPolicyResponse | A response of add an ErasureCoding policy. | 
| CacheDirectiveEntry | Describes a path-based cache directive entry. | 
| CacheDirectiveInfo | Describes a path-based cache directive. | 
| CacheDirectiveInfo.Builder | A builder for creating new CacheDirectiveInfo instances. | 
| CacheDirectiveInfo.Expiration | Denotes a relative or absolute expiration time for a CacheDirective. | 
| CacheDirectiveStats | Describes a path-based cache directive. | 
| CacheDirectiveStats.Builder | |
| CachePoolEntry | Describes a Cache Pool entry. | 
| CachePoolInfo | CachePoolInfo describes a cache pool. | 
| CachePoolStats | CachePoolStats describes cache pool statistics. | 
| CachePoolStats.Builder | |
| CorruptFileBlocks | Contains a list of paths corresponding to corrupt files and a cookie
 used for iterative calls to NameNode.listCorruptFileBlocks. | 
| DatanodeAdminProperties | The class describes the configured admin properties for a datanode. | 
| DatanodeInfo.DatanodeInfoBuilder | Building the DataNodeInfo. | 
| ECBlockGroupStats | Get statistics pertaining to blocks of type  BlockType.STRIPEDin the filesystem. | 
| EncryptionZone | A simple class for representing an encryption zone. | 
| HdfsNamedFileStatus | HDFS metadata for an entity in the filesystem without locations. | 
| ReplicatedBlockStats | Get statistics pertaining to blocks of type  BlockType.CONTIGUOUSin the filesystem. | 
| RollingUpgradeInfo.Bean | |
| SnapshotDiffReport | This class represents to end users the difference between two snapshots of
 the same directory, or the difference between a snapshot of the directory and
 its current state. | 
| SnapshotDiffReport.DiffReportEntry | Representing the full path and diff type of a file/directory where changes
 have happened. | 
| SnapshotDiffReport.DiffStats | Records the stats related to Snapshot diff operation. | 
| SnapshotDiffReportListing | This class represents to  the difference between two snapshots of
 the same directory, or the difference between a snapshot of the directory and
 its current state. | 
| SnapshotDiffReportListing.DiffReportListingEntry | Representing the full path and diff type of a file/directory where changes
 have happened. | 
| SnapshottableDirectoryStatus | Metadata about a snapshottable directory | 
| SnapshottableDirectoryStatus.Bean | |
| ZoneReencryptionStatus | A class representing information about re-encryption of an encryption zone. | 
| ZoneReencryptionStatus.Builder | Builder of  ZoneReencryptionStatus. | 
| Enum | Description | 
|---|---|
| BlockType | Type of a block. | 
| DatanodeInfo.AdminStates | |
| HdfsConstants.DatanodeReportType | |
| HdfsConstants.ReencryptAction | Re-encrypt encryption zone actions. | 
| HdfsConstants.RollingUpgradeAction | |
| HdfsConstants.SafeModeAction | |
| HdfsConstants.StoragePolicySatisfierMode | Storage policy satisfier service modes. | 
| HdfsConstants.UpgradeAction | Upgrade actions. | 
| HdfsFileStatus.Flags | Set of features potentially active on an instance. | 
| OpenFilesIterator.OpenFilesType | Open file types to filter the results. | 
| SnapshotDiffReport.DiffType | Types of the difference, which include CREATE, MODIFY, DELETE, and RENAME. | 
| ZoneReencryptionStatus.State | State of re-encryption. | 
| Exception | Description | 
|---|---|
| SnapshotAccessControlException | Snapshot access related exception. | 
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