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https://issues.apache.org/jira/browse/HADOOP-9565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14307887#comment-14307887
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Steve Loughran commented on HADOOP-9565:
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Thomas, if you could look at how to do a good committer to object stores, and 
so verify whether the information here is adequate, that'd be great.

At the very least we should be looking for this interface on the speculative 
committer and logging @ warn. 

> Add a Blobstore interface to add to blobstore FileSystems
> ---------------------------------------------------------
>
>                 Key: HADOOP-9565
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9565
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs, fs/s3, fs/swift
>    Affects Versions: 2.6.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>         Attachments: HADOOP-9565-001.patch, HADOOP-9565-002.patch, 
> HADOOP-9565-003.patch
>
>
> We can make the fact that some {{FileSystem}} implementations are really 
> blobstores, with different atomicity and consistency guarantees, by adding a 
> {{Blobstore}} interface to add to them. 
> This could also be a place to add a {{Copy(Path,Path)}} method, assuming that 
> all blobstores implement at server-side copy operation as a substitute for 
> rename.



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