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https://issues.apache.org/jira/browse/HADOOP-9565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15150289#comment-15150289
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Steve Loughran commented on HADOOP-9565:
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looking at this —sorry for not doing it earlier. As the initial stuff was my
code, I'm not qualified to vote it in though.
# I like how you've picked this up for s3a and swift
# I think we're going to have to cover azure. Which sort-of has atomic renames
(it has renames, they're just not always O(1). I don't know if we can/should
include complexity of operation into the bitmap. If so, cost of close(),
open(), flush().
# and I think we should add a couple of bits for "supports append" and
"flush-saves data"; if false it means that nothing gets written until the end.
As a follow on from this, I'd like to have something in FileContext too. Even
with a separate patch, we ought to be able to share structures, the constants.
The problem we have there is FileContext is its own thing that relays to the
(hidden) AbstractFilesystem subclass. I think we'd need to have a subclass of
FileContext which indicates this, or we make publishing FS semantics something
common to all filesystems/file contexts. Thoughts?
> 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: Thomas Demoor
> Labels: BB2015-05-TBR
> Attachments: HADOOP-9565-001.patch, HADOOP-9565-002.patch,
> HADOOP-9565-003.patch, HADOOP-9565-004.patch, HADOOP-9565-005.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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