| Package | Description | 
|---|---|
| org.apache.hadoop.hdfs.server.datanode | |
| org.apache.hadoop.hdfs.server.datanode.checker | Datanode support for running disk checks. | 
| org.apache.hadoop.hdfs.server.datanode.fsdataset | |
| org.apache.hadoop.hdfs.server.datanode.fsdataset.impl | 
| Class and Description | 
|---|
| FsVolumeReference This holds volume reference count as AutoClosable resource. | 
| FsVolumeSpi This is an interface for the underlying volume. | 
| ReplicaOutputStreams Contains the output streams for the data and checksum of a replica. | 
| Class and Description | 
|---|
| FsVolumeSpi This is an interface for the underlying volume. | 
| Class and Description | 
|---|
| FsDatasetSpi.Factory A factory for creating  FsDatasetSpiobjects. | 
| FsVolumeReference This holds volume reference count as AutoClosable resource. | 
| FsVolumeSpi This is an interface for the underlying volume. | 
| FsVolumeSpi.BlockIterator BlockIterator will return ExtendedBlock entries from a block pool in
 this volume. | 
| Class and Description | 
|---|
| FsDatasetSpi.Factory A factory for creating  FsDatasetSpiobjects. | 
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