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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6439) NFS should not reject NFS requests to the NULL procedure whether port monitoring is enabled or not
Date Wed, 21 May 2014 01:49:38 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6439?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aaron T. Myers updated HDFS-6439:
---------------------------------

    Attachment: HDFS-6439.patch

Here's a preliminary patch (not intended for commit) that changes the port monitoring to not
be used in the case of the NULL procedure.

Brandon, does this approach look correct to you? Could you perhaps re-run your test with this
patch applied?

Thanks a lot.

> NFS should not reject NFS requests to the NULL procedure whether port monitoring is enabled
or not
> --------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-6439
>                 URL: https://issues.apache.org/jira/browse/HDFS-6439
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: nfs
>    Affects Versions: 2.4.0
>            Reporter: Brandon Li
>         Attachments: HDFS-6439.patch, mount-nfs-requests.pcapng
>
>
> As discussed in HDFS-6406, this JIRA is to track the follow update:
> 1. Port monitoring is the feature name with traditional NFS server and we may want to
make the config property (along with related variable allowInsecurePorts) something as dfs.nfs.port.monitoring.

> 2 . According to RFC2623 (http://www.rfc-editor.org/rfc/rfc2623.txt):
> {quote}    Whether port monitoring is enabled or not, NFS servers SHOULD NOT reject NFS
requests to the NULL procedure (procedure number 0). See subsection 2.3.1, "NULL procedure"
for a complete explanation. {quote}
> I do notice that NFS clients (most time) send mount NULL and nfs NULL from non-privileged
port. If we deny NULL call in mountd or nfs server, the client can't mount the export even
as user root.
> 3. it would be nice to have the user guide updated for the port monitoring feature.



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