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https://issues.apache.org/jira/browse/HADOOP-9797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13755963#comment-13755963
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Kai Zheng commented on HADOOP-9797:
-----------------------------------
Larry & Dilli,
This UGI change desires to be both pluggable and compatible. To be pluggable,
it sure needs to be modular first and this requires removing the relevant
global static variables in the UGI class. On the other hand to be compatible,
as stated in the JIRA description and Dilli suggested, the static public
methods in the UGI class will remain and are to be just deprecated since
they’re part of the API. Sure this focuses on pluggable, removing statics is
more like a side effect. I would keep the support of multiple clusters in mind
in the design and implementation, though.
> Pluggable and compatible UGI change
> -----------------------------------
>
> Key: HADOOP-9797
> URL: https://issues.apache.org/jira/browse/HADOOP-9797
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: security
> Reporter: Kai Zheng
> Assignee: Kai Zheng
> Labels: Rhino
> Fix For: 3.0.0
>
> Attachments: HADOOP-9797-v1.patch
>
>
> As already widely discussed current UGI related classes needs to be improved
> in many aspects. This is to improve and make UGI so that it can be:
>
> * Pluggable, new authentication method with its login module can be
> dynamically registered and plugged without having to change the UGI class;
> * Extensible, login modules with their options can be dynamically extended
> and customized so that can be reusable elsewhere, like in TokenAuth;
>
> * No Kerberos relevant, remove any Kerberos relevant functionalities out of
> it to make it simple and suitable for other login mechanisms;
> * Of appropriate abstraction and API, with improved abstraction and API it’s
> possible to allow authentication implementations not using JAAS modules;
> * Compatible, should be compatible with previous deployment and
> authentication methods, so the existing APIs won’t be removed and some of
> them are just to be deprecated.
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