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Re: 20020812: corrupt LDM queues

Unidata Support wrote:
> 
> ------- Forwarded Message
> 
> >From: "Benjamin Cotton" <address@hidden>
> >Organization: Purdue
> >Keywords: 200208121903.g7CJ3LK07641 LDM queue
> 
> Howdy,
> 
> I learned a lot at the LDM workshop last week, and I'm very grateful
> for that.  However, I don't think we discussed what to do when all hell
> breaks loose.  The situation I'm having here at Purdue is that my LDM
> seems to hang every few hours.  I'd look at the logs, but nothing is
> being written to them.  Sometimes I can stop and start the LDM and get
> things to start going again, but normally I have to delete the product
> queue and remake it before the LDM will work again.  This leads me to
> suspect that something keeps corrupting the queue, but I can't figure
> out what it might be.  My predecessor, Eric Ribble, is baffled as well,
> so I thought I'd throw it to you guys.
> 
> FYI:  I'm running LDM v5.1.3 (planning on upgrading to v5.2 in the
> near future) on FreeBSD.
> 
> Thanks,
> Ben
> 
> Benjamin J. Cotton
> LDM Administrator
> Department of Earth and Atmospheric Science,
> Purdue University
> 
> 165 Cary Quadrangle                          cell: (502) 551-5403
> West Lafayette, IN  47906         campus: (765) 49-52298
> 
> address@hidden
> www.eas.purdue.edu/~bcotton
> 
> ------- End of Forwarded Message

Hi Ben!

You must've dozed off during the "What to Do When All Hell Breaks Loose"
Section!  Not really, guess I'll have to add that section... :-)  

First, is anything at all being written to the logs, ever?  This is the
most important piece for debugging purposes.

Regarding product queue corruption, V5.2 has a new option to pqcat, the
-s option.  I mentioned this in the workshop - it's a moderately
rigorous sanity check.  It would be interesting to see what that
reports.  If all else fails it might be worthwhile to upgrade in order
to use that, especially since you're going to upgrade anyway.

It could be revealing to look at the system logs when this happens.  On
FreeBSD I'm guessing the log you want is /var/adm/messages.

How long has this been happening?

And, I'd be interested taking a look when this happens.  Would you be
willing to give me a login, and then contact me when it's occuring?  If
so, please call me with the password info (303) 497-8677, or otherwise
encode that in a message in some way.

Anne
-- 
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Anne Wilson                     UCAR Unidata Program            
address@hidden                 P.O. Box 3000
                                  Boulder, CO  80307
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