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https://issues.apache.org/jira/browse/HADOOP-6223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12752244#action_12752244
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Sanjay Radia commented on HADOOP-6223:
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@Doug:
> I am seriously considering going with option 2.
>>Can you seriously explain why?
Mostly it is personal choice but my reasons are:
# Since option 2 is the final state it is generally good to start with that.
# Forces one to design the AbstractFileSystem - FileContext relationship
better. I had to keep the difference between old FileSystem and the new
AbstractFileSystem clear in my head. Comments from a few folks also confused
this distinction: E.g. several folks commented "getInitialWorkingDir() is not
needed since we have getWd'; in spite of my comment in the getInitalWD() it
wasn't clear that the new FileSystem, is not suppose to know about wd - it can
have an opinion only on the initial wd.
# Both codepaths
** Applications to FileContext to AbstractFileSystem to AbstractFileSystemImpls
and
** Applications to FileSystem to FileSystemImpls
are part of the system from the beginning. In option 2 the flip at the end
introduces the final code path. This is better for testing.
> 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.
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