[jira] Updated: (HADOOP-6223) New improved FileSystem interface for those implementing new files systems.

["Sanjay Radia (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-6223?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sanjay Radia updated HADOOP-6223:
---------------------------------

    Attachment: Hdfs.java
                afs1.patch

Updated patch for AbstractFileSystem.
Includes a delegator to old FileSystem,  a delegated implementation of LocalFs and  impls of Hdfs, ChecksumFs, FilterFs.

Note wrt to my above comment on API evolution, create() uses option 3 while rename() uses option 2.
Am heavily leaning towards option 2 (classic approach).

This is getting fairly close to be being done. Please review and give feedback.


> 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
>         Attachments: AbstractFileSystem.java, afs1.patch, Hdfs.java, Hdfs.java
>
>
> 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.

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