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https://issues.apache.org/jira/browse/HADOOP-9810?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Debo Liu updated HADOOP-9810:
-----------------------------

    Description: 
,,Token init command authenticates clients and then requests identity token. 
The result token is then persisted in token cache for later usage, being 
available for cross components, to support single sign on. The scope of this is 
as follows: 
 
* Define token storage handler; 
* Define token cache API for storing, accessing, removing of token; 
* Define token cache file location, configuration and etc. 
* Implement default token storage handler based on local file located in user 
home directory.

  was:
Token init command authenticates clients and then requests identity token. The 
result token is then persisted in token cache for later usage, being available 
for cross components, to support single sign on. The scope of this is as 
follows: 
 
* Define token storage handler; 
* Define token cache API for storing, accessing, removing of token; 
* Define token cache file location, configuration and etc. 
* Implement default token storage handler based on local file located in user 
home directory.

    
> Token cache for TokenAuth
> -------------------------
>
>                 Key: HADOOP-9810
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9810
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: security
>            Reporter: Kai Zheng
>            Assignee: Kai Zheng
>              Labels: TokenAuth
>             Fix For: 3.0.0
>
>
> ,,Token init command authenticates clients and then requests identity token. 
> The result token is then persisted in token cache for later usage, being 
> available for cross components, to support single sign on. The scope of this 
> is as follows: 
>  
> * Define token storage handler; 
> * Define token cache API for storing, accessing, removing of token; 
> * Define token cache file location, configuration and etc. 
> * Implement default token storage handler based on local file located in user 
> home directory.

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