org.apache.hadoop.hdfs
Classes 
BlockReader
DeprecatedUTF8
DFSClient
DFSClient.DFSDataInputStream
DFSConfigKeys
DFSUtil
DFSUtil.ErrorSimulator
DistributedFileSystem
DistributedFileSystem.DiskStatus
HdfsConfiguration
HDFSPolicyProvider
HftpFileSystem
HsftpFileSystem
HsftpFileSystem.DummyHostnameVerifier
HsftpFileSystem.DummyTrustManager
Exceptions 
BlockMissingException