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From "Hari Sekhon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7565) NFS gateway UID overflow
Date Tue, 23 Dec 2014 21:17:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14257551#comment-14257551
] 

Hari Sekhon commented on HDFS-7565:
-----------------------------------

To clarify:

The Windows 7 workstation is part of the enterprise Active Directory and is what is sending
that 4 billion UID. My windows user is some random alphanumeric id not relevant here. 

The "hari" user was created by me in this standalone integrated Kerberos realm with backing
LDAP directory which manages the Hadoop cluster. The Hadoop cluster authenticates to this
standalone authentication realm created by me.

So the "hari" user and its 10002 UID were set up by me and appear as local native user on
the cluster nodes.

This is why you see the two UIDs. What I was trying to do was map the 4 billion UID to the
10002 UID using the recently added static map in the other jira HDFS-7563.

The problem here is that when the NFS gateway receives the 4 billion UID from the Windows
workstation it overflows and results in the -2 UID.

According to HDFS-6361 that -2 is set because it's outside the int range, but it's not clear
what the fix is in this instance since it was marked resolved in version 2.4.1 and I'm running
2.6.0.

> NFS gateway UID overflow
> ------------------------
>
>                 Key: HDFS-7565
>                 URL: https://issues.apache.org/jira/browse/HDFS-7565
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: nfs
>    Affects Versions: 2.6.0
>         Environment: HDP 2.2 (Apache Hadoop 2.6.0)
>            Reporter: Hari Sekhon
>            Assignee: Yongjun Zhang
>
> It appears that my Windows 7 workstation is passing a UID around 4 billion to the NFS
gateway and the getUserName() method is being passed "-2", so it looks like the UID is an
int and is overflowing:
> {code}security.ShellBasedIdMapping (ShellBasedIdMapping.java:getUserName(358)) - Can't
find user name for uid -2. Use default user name nobody{code}
> Regards,
> Hari Sekhon
> http://www.linkedin.com/in/harisekon



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