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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-10712) Add support for accessing the NFS gateway from the AIX NFS client
Date Tue, 17 Jun 2014 01:09:01 GMT
Aaron T. Myers created HADOOP-10712:

             Summary: Add support for accessing the NFS gateway from the AIX NFS client
                 Key: HADOOP-10712
                 URL: https://issues.apache.org/jira/browse/HADOOP-10712
             Project: Hadoop Common
          Issue Type: Bug
          Components: nfs
    Affects Versions: 2.4.0
            Reporter: Aaron T. Myers
            Assignee: Aaron T. Myers

We've identified two issues when trying to access the HDFS NFS Gateway from an AIX NFS client:

# In the case of COMMITs, the AIX NFS client will always send 4096, or a multiple of the page
size, for the offset to be committed, even if fewer bytes than this have ever, or will ever,
be written to the file. This will cause a write to a file from the AIX NFS client to hang
on close unless the size of that file is a multiple of 4096.
# In the case of READDIR and READDIRPLUS, the AIX NFS client will send the same cookie verifier
for a given directory seemingly forever after that directory is first accessed over NFS, instead
of getting a new cookie verifier for every set of incremental readdir calls. This means that
if a directory's mtime ever changes, the FS must be unmounted/remounted before readdir calls
on that dir from AIX will ever succeed again.

>From my interpretation of RFC-1813, the NFS Gateway is in fact doing the correct thing
in both cases, but we can introduce simple changes on the NFS Gateway side to be able to optionally
work around these incompatibilities.

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