FsDelegationToken (Apache HBase 1.4.11 API)

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java.lang.Object
- org.apache.hadoop.hbase.security.token.FsDelegationToken

```
@InterfaceAudience.Private
@InterfaceStability.Evolving
public class FsDelegationToken
extends Object
```
Helper class to obtain a filesystem delegation token. Mainly used by Map-Reduce jobs that requires to read/write data to a remote file-system (e.g. BulkLoad, ExportSnapshot).

Constructor Summary

Constructors
Constructor and Description

FsDelegationToken(UserProvider userProvider, String renewer)

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`acquireDelegationToken(org.apache.hadoop.fs.FileSystem fs)` Acquire the delegation token for the specified filesytem.
`org.apache.hadoop.fs.FileSystem`	`getFileSystem()`
`String`	`getRenewer()`
`UserProvider`	`getUserProvider()`
`org.apache.hadoop.security.token.Token<?>`	`getUserToken()`
`void`	`releaseDelegationToken()` Releases a previously acquired delegation token.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - FsDelegationToken
```
public FsDelegationToken(UserProvider userProvider,
                 String renewer)
```
- Method Detail
  - acquireDelegationToken
```
public void acquireDelegationToken(org.apache.hadoop.fs.FileSystem fs)
                            throws IOException
```
    Acquire the delegation token for the specified filesytem. Before requesting a new delegation token, tries to find one already available.
    
    Parameters:
    fs - the filesystem that requires the delegation token
    
    Throws:
    
    IOException - on fs.getDelegationToken() failure
  - releaseDelegationToken
```
public void releaseDelegationToken()
```
    Releases a previously acquired delegation token.
  - getUserProvider
```
public UserProvider getUserProvider()
```
  - getRenewer
```
public String getRenewer()
```
    Returns:
    the account name that is allowed to renew the token.
  - getUserToken
```
public org.apache.hadoop.security.token.Token<?> getUserToken()
```
    Returns:
    the delegation token acquired, or null in case it was not acquired
  - getFileSystem
```
public org.apache.hadoop.fs.FileSystem getFileSystem()
```

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