| Package | Description | 
|---|---|
| org.apache.hadoop.fs | Implementations of  AbstractFileSystemfor hdfs
    over rpc and hdfs over web. | 
| org.apache.hadoop.fs.viewfs | ViewFileSystem and ViewFileSystemOverloadScheme classes. | 
| org.apache.hadoop.ha | |
| org.apache.hadoop.hdfs.client | This package provides the administrative APIs for HDFS. | 
| org.apache.hadoop.hdfs.server.namenode | |
| org.apache.hadoop.ipc | Tools to help define network clients and servers. | 
| org.apache.hadoop.mapred | |
| org.apache.hadoop.mapreduce | |
| org.apache.hadoop.mapreduce.security | |
| org.apache.hadoop.mapreduce.v2.hs | |
| org.apache.hadoop.security | |
| org.apache.hadoop.security.authorize | |
| org.apache.hadoop.security.token | |
| org.apache.hadoop.security.token.delegation | |
| org.apache.hadoop.yarn.client | |
| org.apache.hadoop.yarn.logaggregation.filecontroller | |
| org.apache.hadoop.yarn.security | |
| org.apache.hadoop.yarn.security.client | 
| Class and Description | 
|---|
| AccessControlException An exception class for access control related issues. | 
| UserGroupInformation User and group information for Hadoop. | 
| Class and Description | 
|---|
| AccessControlException An exception class for access control related issues. | 
| Class and Description | 
|---|
| AccessControlException An exception class for access control related issues. | 
| Class and Description | 
|---|
| AccessControlException An exception class for access control related issues. | 
| Class and Description | 
|---|
| UserGroupInformation User and group information for Hadoop. | 
| Class and Description | 
|---|
| UserGroupInformation User and group information for Hadoop. | 
| Class and Description | 
|---|
| Credentials A class that provides the facilities of reading and writing
 secret keys and Tokens. | 
| Class and Description | 
|---|
| Credentials A class that provides the facilities of reading and writing
 secret keys and Tokens. | 
| Class and Description | 
|---|
| Credentials A class that provides the facilities of reading and writing
 secret keys and Tokens. | 
| Class and Description | 
|---|
| AccessControlException An exception class for access control related issues. | 
| Class and Description | 
|---|
| Credentials A class that provides the facilities of reading and writing
 secret keys and Tokens. | 
| UserGroupInformation User and group information for Hadoop. | 
| UserGroupInformation.AuthenticationMethod existing types of authentications' methods | 
| Class and Description | 
|---|
| AccessControlException An exception class for access control related issues. | 
| UserGroupInformation User and group information for Hadoop. | 
| Class and Description | 
|---|
| UserGroupInformation User and group information for Hadoop. | 
| Class and Description | 
|---|
| UserGroupInformation User and group information for Hadoop. | 
| Class and Description | 
|---|
| UserGroupInformation User and group information for Hadoop. | 
| Class and Description | 
|---|
| UserGroupInformation User and group information for Hadoop. | 
| Class and Description | 
|---|
| UserGroupInformation User and group information for Hadoop. | 
| Class and Description | 
|---|
| UserGroupInformation User and group information for Hadoop. | 
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