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From "John George (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-6356) Add a Cache for AbstractFileSystem in the new FileContext/AbstractFileSystem framework.
Date Fri, 04 May 2012 19:00:48 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13268623#comment-13268623
] 

John George commented on HADOOP-6356:
-------------------------------------

An issue that was raised as part of HADOOP-8319 is that in cases where there are symlinks
that point to a different FS than the defaultFS, we will lose any state that is maintained
by the client. So, for example, the setWriteChecksum or setVerifyChecksum, which are flags
that are maintained by the client will be lost since for each instance of the call, we create
a new object. 

The reason  I raise that here is because it seemed very similar to what is being discussed
here. My proposal is that we keep a table of each instance of the filesystem that is not the
defaultFS so that we can keep going back to the same instance of the FS within a filecontext.
This would also help in a case if we were to ever decide to add anything that requires state
to be maintained on the client side. 


                
> Add a Cache for AbstractFileSystem in the new FileContext/AbstractFileSystem framework.
> ---------------------------------------------------------------------------------------
>
>                 Key: HADOOP-6356
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6356
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>    Affects Versions: 0.22.0
>            Reporter: Sanjay Radia
>            Assignee: Sanjay Radia
>
> The new filesystem framework, FileContext and AbstractFileSystem does not implement a
cache for AbstractFileSystem.
> This Jira proposes to add a cache to the new framework just like with the old FileSystem.

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