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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 Tue, 09 Jul 2013 18:29:49 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13703597#comment-13703597
] 

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

This is what I'm thinking
# Blobstore interface for {{FileSystem}} and {{AbstractFileSystem}}
# blobstores to provide an instance specific enum set of consistency guarantees
# a local/remote flag, so that those FSs that know when they are in-cluster (swift explicitly,
s3 once it does an nslookup & sees the bucket is on a 10. address).
# an optional (how to check?) copy() method that triggers a remote copy see  [http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectCOPY.html]
for an example -much lower cost than a local copy.
# a {{put(Path, InputStream, length)}} that can be used to do a direct PUT without having
to buffer it through a local file. This would be more efficient and should offer a better
way to do these uploads than hiding them in a close operation that may be having its exceptions
swallowed.
                
> 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: Sub-task
>          Components: fs
>    Affects Versions: 2.0.4-alpha
>            Reporter: Steve Loughran
>            Priority: Minor
>
> 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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