| Package | Description | 
|---|---|
| org.apache.hadoop.fs | Implementations of  AbstractFileSystemfor hdfs
    over rpc and hdfs over web. | 
| org.apache.hadoop.fs.adl | Supporting classes for metrics instrumentation. | 
| org.apache.hadoop.fs.azure | 
A distributed implementation of  FileSystemfor reading and writing files on
Azure Block Storage. | 
| org.apache.hadoop.fs.ftp | |
| org.apache.hadoop.fs.s3native | 
A distributed implementation of  FileSystemfor reading and writing files on
Amazon S3. | 
| org.apache.hadoop.fs.viewfs | ViewFileSystem and ViewFileSystemOverloadScheme classes. | 
| org.apache.hadoop.hdfs.server.namenode | |
| org.apache.hadoop.io | Generic i/o code for use when reading and writing data to the network,
to databases, and to files. | 
| org.apache.hadoop.mapred | |
| org.apache.hadoop.mapred.lib | |
| org.apache.hadoop.mapred.lib.db | |
| org.apache.hadoop.mapred.pipes | |
| org.apache.hadoop.mapreduce | |
| org.apache.hadoop.mapreduce.lib.partition | |
| org.apache.hadoop.mapreduce.tools | |
| org.apache.hadoop.tools | Command-line tools for MapReduce. | 
| org.apache.hadoop.tools.dynamometer | The Dynamometer tool is used to stress test the HDFS NameNode by setting
 up a realistic environment consistent of fake DataNodes and a real NameNode
 with a real FS namesystem and near-real user workload (RPCs). | 
| org.apache.hadoop.util | Common utilities. | 
| org.apache.hadoop.yarn.client.cli | |
| org.apache.hadoop.yarn.util | 
| Class and Description | 
|---|
| Progressable A facility for reporting progress. | 
| Class and Description | 
|---|
| Progressable A facility for reporting progress. | 
| Class and Description | 
|---|
| Progressable A facility for reporting progress. | 
| Tool A tool interface that supports handling of generic command-line options. | 
| Class and Description | 
|---|
| Progressable A facility for reporting progress. | 
| Class and Description | 
|---|
| Progressable A facility for reporting progress. | 
| Class and Description | 
|---|
| Progressable A facility for reporting progress. | 
| Class and Description | 
|---|
| Tool A tool interface that supports handling of generic command-line options. | 
| Class and Description | 
|---|
| Progressable A facility for reporting progress. | 
| Class and Description | 
|---|
| Progressable A facility for reporting progress. | 
| Tool A tool interface that supports handling of generic command-line options. | 
| Class and Description | 
|---|
| Progressable A facility for reporting progress. | 
| Class and Description | 
|---|
| Progressable A facility for reporting progress. | 
| Class and Description | 
|---|
| Tool A tool interface that supports handling of generic command-line options. | 
| Class and Description | 
|---|
| Progressable A facility for reporting progress. | 
| Class and Description | 
|---|
| Tool A tool interface that supports handling of generic command-line options. | 
| Class and Description | 
|---|
| Tool A tool interface that supports handling of generic command-line options. | 
| Class and Description | 
|---|
| Tool A tool interface that supports handling of generic command-line options. | 
| Class and Description | 
|---|
| Tool A tool interface that supports handling of generic command-line options. | 
| Class and Description | 
|---|
| OperationDuration Little duration counter. | 
| Shell A base class for running a Shell command. | 
| ShutdownHookManager The  ShutdownHookManagerenables running shutdownHook
 in a deterministic order, higher priority first. | 
| SysInfo Plugin to calculate resource information on the system. | 
| Tool A tool interface that supports handling of generic command-line options. | 
| Class and Description | 
|---|
| Tool A tool interface that supports handling of generic command-line options. | 
| Class and Description | 
|---|
| ApplicationClassLoader A  URLClassLoaderfor application isolation. | 
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