[LDM #AUZ-681434]: LDM Partial Files

Hi Walter,

> Does ldm use some mechanism to prevent users from reading files before they
> are finished being written? I'm thinking of something like *.*(dot) files
> or changing file permissions.
> I would give you more information but I am a novice user and not sure what
> you might need to know about our usage of ldm.

LDM data-products are processed locally via the pqact(1) utility, which won't 
act on a product until it has been completely received. If the utility is 
writing the product to a file, then it's possible that another process could 
read an incomplete product from the file. The way to obviate this would be to 
either pipe the product to a decoder (instead of filing the product) or to act 
on the file *after* it has been closed. For example, the pqact(1) configuration 
file could contain

    <feedtype> <pattern> FILE -overwrite -close <pathname>
    <feedtype> <pattern> EXEC <program> <pathname>

More information on the LDM can be found at 
<https://www.unidata.ucar.edu/software/ldm/ldm-current/basics/index.html>.

Please feel free to contact us if you have further questions.

Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: AUZ-681434
Department: Support LDM
Priority: Normal
Status: Closed
===================
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