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https://issues.apache.org/jira/browse/HADOOP-13447?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15421618#comment-15421618
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Chris Nauroth commented on HADOOP-13447:
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[[email protected]], this is another one that I'd like us to consider taking 
straight to trunk and branch-2, similar to HADOOP-13446.  I think HADOOP-13252 
should be committed first though, so that the refactoring work here doesn't 
stomp on your credential provider chain work.

> S3Guard: Refactor S3AFileSystem to support introduction of separate metadata 
> repository and tests.
> --------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-13447
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13447
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>            Reporter: Chris Nauroth
>            Assignee: Chris Nauroth
>         Attachments: HADOOP-13447-HADOOP-13446.001.patch, 
> HADOOP-13447-HADOOP-13446.002.patch
>
>
> The scope of this issue is to refactor the existing {{S3AFileSystem}} into 
> multiple coordinating classes.  The goal of this refactoring is to separate 
> the {{FileSystem}} API binding from the AWS SDK integration, make code 
> maintenance easier while we're making changes for S3Guard, and make it easier 
> to mock some implementation details so that tests can simulate eventual 
> consistency behavior in a deterministic way.



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