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https://issues.apache.org/jira/browse/HADOOP-14556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16595643#comment-16595643
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Steve Loughran commented on HADOOP-14556:
-----------------------------------------

Findbugs errors all look valid; will need to fix.

[~daryn]: is the reason for the s3a://user@bucket feature so that you can go 
from s3a://user:secret/ to a session token triple for that user? And so when 
you get to the far end the right secrets are picked up? 

as if so, I have another solution: remove support for embedding AWS credentials 
in URIs; HADOOP-14833 . We've been telling people this feature will go away 
since hadoop 2.8 & per-bucket access; S3Guard doesn't play well with it either.

> S3A to support Delegation Tokens
> --------------------------------
>
>                 Key: HADOOP-14556
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14556
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.2.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>         Attachments: HADOOP-14556-001.patch, HADOOP-14556-002.patch, 
> HADOOP-14556-003.patch, HADOOP-14556-004.patch, HADOOP-14556-005.patch, 
> HADOOP-14556.oath-002.patch, HADOOP-14556.oath.patch
>
>
> S3A to support delegation tokens where
> * an authenticated client can request a token via 
> {{FileSystem.getDelegationToken()}}
> * Amazon's token service is used to request short-lived session secret & id; 
> these will be saved in the token and  marshalled with jobs
> * A new authentication provider will look for a token for the current user 
> and authenticate the user if found
> This will not support renewals; the lifespan of a token will be limited to 
> the initial duration. Also, as you can't request an STS token from a 
> temporary session, IAM instances won't be able to issue tokens.



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