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From "Sanjay Radia (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-6223) New improved FileSystem interface for those implementing new files systems.
Date Fri, 25 Sep 2009 16:12:16 GMT

     [ 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

I have attached a draft for AbstractFileSystem and one impl Hdfs.
Will add a delegator class that delegates calls to old Filesystem for all the other filesystems
(local fs, s3, kfs etc).

Q. Strictly speaking AbstractFileSystem should take a slash-relative name or or Fully-qualified-uri

that is for the *this* filesystem.
Should we restrict AbstractFileSystem to require fully-qualified pathnames? My current  impl
 does that to
help me catch bugs in the upper layer (FileContext) that accidently sends a slash-path name
to the wrong file system.
 (The glob code btw had such a bug.)

> 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, Hdfs.java
> The FileContext API (HADOOP-4952) provides an improved interface for the application
> 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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