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From "Mukul Kumar Singh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11575) Supporting HDFS NFS gateway with Federated HDFS
Date Wed, 29 Mar 2017 09:34:42 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15946813#comment-15946813
] 

Mukul Kumar Singh commented on HDFS-11575:
------------------------------------------

Hi Andrew, Thanks for your comment.

With the current situation, there would be need of multiple NFS server installations, one
for each HDFS, and that would mean more operational burden to run multiple NFS servers. This
patch will help in minimizing this overhead by exporting the filesystem through a single NFS
server.

Please let me know of your comments.

> Supporting HDFS NFS gateway with Federated HDFS
> -----------------------------------------------
>
>                 Key: HDFS-11575
>                 URL: https://issues.apache.org/jira/browse/HDFS-11575
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: nfs
>            Reporter: Mukul Kumar Singh
>            Assignee: Mukul Kumar Singh
>         Attachments: HDFS-11575.001.patch, SupportingNFSwithFederatedHDFS.pdf
>
>
> Currently HDFS NFS gateway only supports HDFS as the underlying filesystem.
> Federated HDFS with ViewFS helps in improving the scalability of the name nodes. However
NFS is not supported with ViewFS.
> With this change, ViewFS using HDFS as the underlying filesystem can be exported using
NFS. ViewFS mount table will be used to determine the exports which needs to be supported.
> Some important points
> 1) This patch only supports HDFS as the underlying filesystem for ViewFS.
> 2) This patch add support to add more than one export point in the NFS gateway
> 3) Root filesystem of the ViewFS will not be mountable for NFS gateway with ViewFS,
>    however this will not be the case for NFS gateway with HDFS
> 4) A filehandle now apart from the field will also contain an identifier to identify
the name node, this will be used to map to correct name node for file operations.
> Please find the attached pdf document which helps in explaining the design and the solution.
>  



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