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https://issues.apache.org/jira/browse/HADOOP-9565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15436472#comment-15436472
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Steve Loughran commented on HADOOP-9565:
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algorithm 2 is what I've been using for hive & spark testing...it works, but I 
haven't done enough failure testing to explore its failure modes, especially 
when speculation=true


> 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: Pieter Reuse
>         Attachments: HADOOP-9565-001.patch, HADOOP-9565-002.patch, 
> HADOOP-9565-003.patch, HADOOP-9565-004.patch, HADOOP-9565-005.patch, 
> HADOOP-9565-006.patch, HADOOP-9565-branch-2-007.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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