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https://issues.apache.org/jira/browse/HADOOP-19740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18048593#comment-18048593
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ASF GitHub Bot commented on HADOOP-19740:
-----------------------------------------

steveloughran commented on PR #8058:
URL: https://github.com/apache/hadoop/pull/8058#issuecomment-3702567730

   now only use "sdk" though the docs ask for a few more as I am not fully in 
sync. 
   
   trying to explain in user docs WTF happens is hard, I've tried to give 
explicit instructions for various deployment scenarios.




> S3A: add explicit "sdk" and "ec2" regions for region resolution through SDK 
> and EC2 IAM
> ---------------------------------------------------------------------------------------
>
>                 Key: HADOOP-19740
>                 URL: https://issues.apache.org/jira/browse/HADOOP-19740
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs/s3
>    Affects Versions: 3.4.2
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>              Labels: pull-request-available
>
> Add explicit regions to hand off to the sdk
> * sdk: "use the sdk chain"
> * ec2: "we are in EC2, use the local region": use the iAM logic inside the 
> SDK directly.
> empty string "" also hands off to the SDK; the warning will be removed
> also: if an endpoint is set and it is not parsed as a vpce endpoint, we will 
> automatically add the endpoint name "external". This avoids the need to make 
> up an external region when working with an endpoint.



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