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From "Aaron Fabbri (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14391) s3a: auto-detect region for bucket and use right endpoint
Date Fri, 05 May 2017 19:39:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15998852#comment-15998852
] 

Aaron Fabbri commented on HADOOP-14391:
---------------------------------------

There appears to be [an API|http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/s3/AmazonS3.html#getBucketLocation-com.amazonaws.services.s3.model.GetBucketLocationRequest-]
 to query bucket location.

I suppose we could:

- Introduce a new config flag, say, {{fs.s3a.auto.set.endpoint}} (or we could use a special
value "auto" for {{fs.s3a.endpoint}}.)
- When enabled, at init time, use {{AmazonS3#getBucketLocation(..)}}, {{Region#fromValue()}},
then build the endpoint name s3-${REGION}.amazonaws.com and set it.



> s3a: auto-detect region for bucket and use right endpoint
> ---------------------------------------------------------
>
>                 Key: HADOOP-14391
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14391
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: s3
>    Affects Versions: 3.0.0-alpha2
>            Reporter: Aaron Fabbri
>
> Specifying the S3A endpoint ({{fs.s3a.endpoint}}) is
> - *required* for regions which only support v4 authentication
> - A good practice for all regions.
> The user experience of having to configure endpoints is not great.  Often it is neglected
and leads to additional cost, reduced performance, or failures for v4 auth regions.
> I want to explore an option which, when enabled, auto-detects the region for an s3 bucket
and uses the proper endpoint.  Not sure if this is possible or anyone has looked into it yet.



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