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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9565) Add a Blobstore interface to add to blobstore FileSystems
Date Thu, 05 Feb 2015 10:35:35 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14306979#comment-14306979
] 

Steve Loughran commented on HADOOP-9565:
----------------------------------------

One thing to consider is: what are the key bits of code which care that the destination is
an object store. 

I think distCp may be one: it's often used as the way to get data in/out a transient HDFS
instance. 

HADOOP-11487 shows how eventual consistency can catch it out

> 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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