| Package | Description | 
|---|---|
| org.apache.hadoop.conf | Configuration of system parameters. | 
| org.apache.hadoop.crypto.key | Licensed to the Apache Software Foundation (ASF) under one
 or more contributor license agreements. | 
| org.apache.hadoop.fs | An abstract file system API. | 
| org.apache.hadoop.fs.ftp | |
| org.apache.hadoop.fs.http | Filesystem implementations that allow Hadoop to read directly from
 HTTP / HTTPS endpoints. | 
| org.apache.hadoop.fs.sftp | SFTP FileSystem package. | 
| org.apache.hadoop.fs.shell | |
| org.apache.hadoop.fs.viewfs | |
| org.apache.hadoop.ha | |
| org.apache.hadoop.io.serializer | 
This package provides a mechanism for using different serialization frameworks
in Hadoop. | 
| org.apache.hadoop.io.serializer.avro | 
This package provides Avro serialization in Hadoop. | 
| org.apache.hadoop.security | |
| org.apache.hadoop.security.alias | |
| org.apache.hadoop.tools | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | ReconfigurableBaseUtility base class for implementing the Reconfigurable interface. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | KeyShellThis program is the CLI utility for the KeyProvider facilities in Hadoop. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | ChecksumFileSystemAbstract Checksumed FileSystem. | 
| class  | FileSystemAn abstract base class for a fairly generic filesystem. | 
| class  | FilterFileSystemA  FilterFileSystemcontains
 some other file system, which it uses as
 its  basic file system, possibly transforming
 the data along the way or providing  additional
 functionality. | 
| protected class  | FsShell.HelpDisplays short usage of commands sans the long description | 
| protected class  | FsShell.UsageDisplay help for commands with their short usage and long description. | 
| class  | org.apache.hadoop.fs.FsShellPermissionsThis class is the home for file permissions related commands. | 
| static class  | FsShellPermissions.ChgrpUsed to change group of files | 
| static class  | FsShellPermissions.ChmodThe pattern is almost as flexible as mode allowed by chmod shell command. | 
| static class  | FsShellPermissions.ChownUsed to change owner and/or group of files | 
| class  | HarFileSystemThis is an implementation of the Hadoop Archive 
 Filesystem. | 
| class  | LocalFileSystemImplement the FileSystem API for the checksumed local filesystem. | 
| class  | RawLocalFileSystemImplement the FileSystem API for the raw local filesystem. | 
| class  | TrashProvides a trash facility which supports pluggable Trash policies. | 
| class  | TrashPolicyThis interface is used for implementing different Trash policies. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | FTPFileSystem
 A  FileSystembacked by an FTP client provided by Apache Commons Net. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | HttpFileSystemA Filesystem that reads from HTTP endpoint. | 
| class  | HttpsFileSystemA Filesystem that reads from HTTPS endpoint. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | SFTPFileSystemSFTP FileSystem. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | org.apache.hadoop.fs.shell.CommandAn abstract class for the execution of a file system command | 
| class  | org.apache.hadoop.fs.shell.FsCommandBase class for all "hadoop fs" commands. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | ViewFileSystemViewFileSystem (extends the FileSystem interface) implements a client-side
 mount table. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | PowerShellFencerFencer method that uses PowerShell to remotely connect to a machine and kill
 the required process. | 
| class  | ShellCommandFencerFencing method that runs a shell command. | 
| class  | SshFenceByTcpPortThis fencing implementation sshes to the target node and uses 
  fuserto kill the process listening on the service's
 TCP port. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | WritableSerializationA  SerializationforWritables that delegates toWritable.write(java.io.DataOutput)andWritable.readFields(java.io.DataInput). | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | AvroReflectSerializationSerialization for Avro Reflect classes. | 
| class  | AvroSerialization<T>Base class for providing serialization to Avro types. | 
| class  | AvroSpecificSerializationSerialization for Avro Specific classes. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | KDiagKerberos diagnostics
 This operation expands some of the diagnostic output of the security code,
 but not all. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | CredentialShellThis program is the CLI utility for the CredentialProvider facilities in 
 Hadoop. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | GetGroupsBaseBase class for the HDFS and MR implementations of tools which fetch and
 display the groups that users belong to. | 
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