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From "Brandon Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4750) Support NFSv3 interface to HDFS
Date Tue, 30 Apr 2013 06:40:19 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13645322#comment-13645322
] 

Brandon Li commented on HDFS-4750:
----------------------------------

@Han{quote}..not having understood the description in the pdf that "Hadoop+FUSE could be used
to provide an NFS interface for HDFS. However it has many known problems and limitations."{quote}
For example, FUSE is not inode based like NFS. FUSE usually uses path to generate the NFS
file handle. Its path-handle mapping can make the host run out of memory. Even it can work
around the memory problem, it could have correctness issue. FUSE may not be aware that a file's
path has been changed by other means(e.g., hadoop CLI). If FUSE is used on the client side,
each NFS client has to install a client component which runs only on Linux so far. ...
                
> Support NFSv3 interface to HDFS
> -------------------------------
>
>                 Key: HDFS-4750
>                 URL: https://issues.apache.org/jira/browse/HDFS-4750
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>    Affects Versions: 3.0.0
>            Reporter: Brandon Li
>            Assignee: Brandon Li
>         Attachments: HADOOP-NFS-Proposal.pdf, nfs-trunk.patch
>
>
> Access HDFS is usually done through HDFS Client or webHDFS. Lack of seamless integration
with client’s file system makes it difficult for users and impossible for some applications
to access HDFS. NFS interface support is one way for HDFS to have such easy integration.
> This JIRA is to track the NFS protocol support for accessing HDFS. With HDFS client,
webHDFS and the NFS interface, HDFS will be easier to access and be able support more applications
and use cases. 
> We will upload the design document and the initial implementation. 

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