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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6223) New improved FileSystem interface for those implementing new files systems.
Date Wed, 07 Oct 2009 20:35:31 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12763251#action_12763251
] 

Tsz Wo (Nicholas), SZE commented on HADOOP-6223:
------------------------------------------------

In the current implementation, if an option is specified but the underlying FileSystem is
not supported (e.g. specifying replication on LocalFileSystem), the specified option will
be ignored silently.  This seems to be hard to understand from users' point of view.  I think
we should clarify the options on the javadoc/user guide.

> 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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