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https://issues.apache.org/jira/browse/HADOOP-14145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15901375#comment-15901375
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Sean Mackrory commented on HADOOP-14145:
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So all of my attempts at automated testing of this raised a separate issue: we 
modify the configuration used to create the S3AFileSystem instance to use 
NullMetadataStore (so that we have a clean distinction between S3 and the 
MetadataStore), but that configuration can then leak back into the 
metadatastore. I don't know why that only happens when running S3GuardTool.run 
from a test instead of the command-line, but it certainly seems to. Trying to 
untangle that is turning into quite a significant refactor, so I think that 
should be address separately from the relatively simple addition of 
GenericOptionsParser...

> Ensure GenericOptionParser is used for S3Guard CLI
> --------------------------------------------------
>
>                 Key: HADOOP-14145
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14145
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>            Reporter: Sean Mackrory
>            Assignee: Sean Mackrory
>         Attachments: HADOOP-14145-HADOOP-13345.001.patch
>
>
> As discussed in HADOOP-14094.



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