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Sanjay Radia commented on HADOOP-6223: -------------------------------------- Migration strategy: Two options here: # Transition by delegating from FileSystem to the new AbstractFileSystem (possibly over one more more releases) ** Add FileContext; FileContext calls FileSystem ** Deprecate FileSystem ** Add AbstractFileSystem ** Migrate each FS-impl to AbstractFileSystem and use a FileSystem delegator to delegate FileSystem calls to AbstractFileSystem so that AFS-impl is called. This step may occur over one or more releases. ** Change FileContext to call AbstractFileSystem ** Remove FileSystem (say after 1 or 2 releases) # Transition by delegating from AbstractFileSystem to the new FileSystem (possibly over one more more releases) ** Add FileContext and AbstractFileSystem; FileContext calls AbsrtactFileSystem ** AbstractFileSystem delegates to FileSystem for each AFS-impl that has not yet been implemented ** Migrate each FS-Impl to AbstractFileSystem -the delegator will no longer call FS-Impl, instead AFS_impl will be called directly. This step may occur over one or more releases. ** Remove FileSystem (say after 1 or 2 releases) Originally I was planning to use option 1 and hence my patch for FileContext calls FileSystem. I am seriously considering going with option 2. > New improved FileSystem interface for those implementing new files systems. > --------------------------------------------------------------------------- > > Key: HADOOP-6223 > URL: https://issues.apache.org/jira/browse/HADOOP-6223 > Project: Hadoop Common > Issue Type: Sub-task > Reporter: Sanjay Radia > Assignee: Sanjay Radia > > The FileContext API (HADOOP-4952) provides an improved interface for the > application writer. > This lets us simplify the FileSystem API since it will no longer need to deal > with notions of default filesystem [ / ], wd, and config > defaults for blocksize, replication factor etc. Further it will not need the > many overloaded methods for create() and open() since > the FileContext API provides that convenience. > The FileSystem API can be simplified and can now be restricted to those > implementing new file systems. > This jira proposes that we create new file system API, and deprecate > FileSystem API after a few releases. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.