does LDM lock files in transmission?

• To: ldm-users@xxxxxxxxxxxxxxxx
• Subject: does LDM lock files in transmission?
• From: "Jason J. Levit" <jlevit@xxxxxx>
• Date: Fri, 05 Oct 2001 15:50:49 -0500

  Hi all,

  I'm writing an application that will process some real-time data I'm
ingesting through LDM.  This application will run around the clock in
the cron, so it needs to be fairly robust.  Here's my question - say I
ingest a file via LDM.  How do I know that file is complete?  Does LDM
place some sort of lock or other information on the file before it's
completed writing?  If my application tries to access a file that does
not contain all the necessary data (a file that still has yet to be
completely transmitted, for example), then I need to have my application
not process the file.

  Does anyone else out there have experience with this?  I know there's
tricks you can perform, such as checking to see if the file has been
modified in the past 30 seconds before opening, etc., etc., but I was
just wondering if LDM actually places some sort of information with the
file that says "hey, this file isn't done yet".  Thanks for any help!

  Jason

-- 
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Jason J. Levit, N9MLA                   Research Scientist,
jlevit@xxxxxx             Center for Analysis and Prediction of Storms
Room 1022                              University of Oklahoma
405/325-3503                           http://www.caps.ou.edu/

• Follow-Ups:
  • Re: does LDM lock files in transmission?
    • From: Anne Wilson