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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 Thu, 22 May 2014 00:57:38 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 more fleshed out patch which no longer rejects the NULL request regardless of the
source port including a test, changes the config name, and updates the user guide.

[~brandonli] - please take a look at this and let me know what you think.

> 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
>            Assignee: Aaron T. Myers
>         Attachments: HDFS-6439.patch, 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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