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Steve Loughran commented on HADOOP-9565: ---------------------------------------- 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)