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FUSER problems

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Operating Systems Solaris FUSER problems
# 8  
Old 10-04-2010
Uhhm. Let me try and understand your findings. So, if i have a file that lives on machine A and is mounted. I have a process running on machine A that has the file opened. I issue an fuser from machine B, will I or will I not be able to get the process id and user id?

Thanks.....
Harleyrci
# 9  
Old 10-04-2010
Quote:
Originally Posted by Harleyrci
So, if i have a file that lives on machine A and is mounted.
mounted ? I guess you mean that file is shared.
Quote:
I have a process running on machine A that has the file opened.
Is machine A the NFS server ? That process is accessing a file located on a local file system, correct ?
Quote:
I issue an fuser from machine B, will I or will I not be able to get the process id and user id?
What is machine B ? You do not define its role here.
# 10  
Old 10-04-2010
Yes, machine A is the actual location of the file that is NFS mounted. FTP process runs on machine A, creating a file in ~/EBT/receive/some-name. On machine B, there is a daemon that issues fuser on that file every few minutes, all day long. If it finds a process id and user id it goes to sleep. Now my question is will fuser (issued on machine a on the NFS mounted file) bring back the user-id and process id of the process that has the file open?
Harleyrci
# 11  
Old 10-04-2010
Quote:
Originally Posted by Harleyrci
Greetings,
Thanks again for the support. The daemon issues an fuser on a file that is NFS mounted. So, (In theory) if a process has the file opened, the fuser would bring back the process id's and user-ids that have the file opened. It's a daemon process that was written before my time, and it has fallen on my lap to support. Currently, the daemon is moving grabbing files that are still being created by the FTP. Also, any ideas on how to identify if the FTP has not sent the complete file?
The only way fuser will find the processes that have the file open are if the fuser is run on the same machine as the process that has the file open. If the process is running on machine A and the file is on a file system that's actually located on and NFS shared from machine B, an fuser command run on machine B will not show the process on machine A.

There's lots of reasons why it works that way and for all practical purposes simply can't be made to work otherwise.

As for picking up incomplete files, the only one who can tell if the entire file has been sent is the sender. There's no way anyone receiving a file can tell if it's complete unless there's some passing of information in some way that indicates the file is complete.

One of the easiest ways is to have the sender rename the file from a name that indicates it's still being sent to a name that indicates that it's complete. Since a simple rename within one file system is an atomic operation on every sane file system, it's about the best way I know of to indicate that the file is completely sent.
# 12  
Old 10-04-2010
Thanks so much for the help. You really helped my understand this issue much better. My work around is to monitor the growth of the file. When it no longer increases then the daemon moves forward with processing any files it finds.
Harleyrci
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