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From "Christopher Tubbs (JIRA)" <>
Subject [jira] [Reopened] (ACCUMULO-4348) Deprecate KerberosToken constructor that exposes UserGroupInformation
Date Wed, 22 Jun 2016 19:57:16 GMT


Christopher Tubbs reopened ACCUMULO-4348:

Re-opening to replace warnings suppressions with better alternative.

> Deprecate KerberosToken constructor that exposes UserGroupInformation
> ---------------------------------------------------------------------
>                 Key: ACCUMULO-4348
>                 URL:
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: client, core
>    Affects Versions: 1.7.2
>            Reporter: William Slacum
>            Assignee: William Slacum
>            Priority: Trivial
>             Fix For: 1.8.0
>   Original Estimate: 10m
>          Time Spent: 2h 50m
>  Remaining Estimate: 0h
> {{KerberosToken}} works by setting up some metadata about a current user to be validated
later by when a {{UGIAssumingTransport}} is created. The {{public KerberosToken(String principal,
File keytab, boolean replaceCurrentUser) throws IOException}} constructor leaks out the {{UserGroupInformation}}
(or a construct with a similar concept of having mutable, static variables) dependency, by
allowing users to login as a user and hold on to their credentials in a place external to
the token itself. 
> While working on ACCUMULO-4306, I was thinking about whether or not this feature/side
effect of {{KerberosToken}} made sense. It is a user convenience thing, but it's not a big
convenience, as logging in as another user isn't complicated (via {{UserGroupInformation}}
or standard Java methodologies. It's also a potential hazard if two threads update the same
{{UserGroupInformation}} class at the same time. 
> Without much convenience and concurrency pitfalls, marking this deprecating in 1.8 and
removing in 2.0 makes the most sense.

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