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[LDM #WOM-274153]: Reproducible bug in LDM 6.13.10



Gilbert,

> >> ldmadmin stop
> >> ldmadmin delqueue
> >> ldmadmin clean
> >
> > I take it there were no problems with these commands.
> 
> Nope.

Good.

> > There were no messages from the downstream LDM processes on nfs01 about the 
> > connection to the upstream LDM process being broken?
> 
> No. Is that supposed to happen? I would assume so, but I've never done a dual 
> primary feed request until you told me to do so.

When a downstram LDM process has to reconnect, it logs a NOTICE-level message.

> > What are the pqact(1) actions that aren't writing to disk? FILE or PIPE?
> 
> FILE for sure. Given that I get alerts that all the feeds are down, I'm 
> thinking the PIPEs are dead too.

OK.

> >> There are NO log entries on nfs01 showing anything out of the
> >> ordinary; everything appears to be normal. But, nothing is writing to disk,
> >> even though an "ldmadmin watch" on nfs01 shows all feeds apparently coming
> >> in just fine.
> >
> > Including IDS|DDPLUS?
> 
> Yep!
> 
> >> But, this command in LDM's crontab on nfs01:
> >>
> >> 1,6,11,17,21,26,32,36,41,47,51,56 * * * * /bin/bash -l -c 'wasReceived -f
> >> "WMO|NIMAGE|NGRID|NEXRAD3" -o 180' || /bin/mail -s 'NOAAPORT data has not
> >> been received in the last 3 minutes on nfs01' address@hidden,
> >> address@hidden,address@hidden,address@hidden
> >> </dev/null
> >>
> >> Gets me the dreaded alert via text and emails:
> >>
> >> NOAAPORT data has not been received in the last 3 minutes on nfs01
> >
> > This is inconsistent with your assertion that an "ldmadmin watch" on nfs01 
> > shows all feeds continuing to arrive.
> 
> Correct, which is why this is so bizzarre.

I'd say impossible.

> > So the downstream LDM on nfs01 that requests IDS|DDPLUS from 
> > idd.aos.wisc.edu stops inserting such products into the queue?
> 
> Apparently so. I can see them come across, but they just don't write into the 
> queue anymore.

But, you said an "ldmadmin watch" shows IDS|DDPLUS products. That command just 
watches the end of the queue for newly-inserted products. If it shows them, 
then they were inserted.

> Now, if I tell the LTM to stop on NFS01, and then I tell it to start again, 
> it says the queue is corrupt and it won't start.

The LDM stops cleanly?

> > Are the clocks on all the systems correct?
> 
> Yep.
> 
> > When this happens, can you attach gdb(1) to one of the pqact(1) processes 
> > that isn't writing anything to disk and send me a stack trace?
> 
> Can you give me a command line example, please?

gdb -p <pid>, where <pid> is the process identifier of the pqact(1) process. 
Then execute the command "where" followed by "q" to exit.

Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: WOM-274153
Department: Support LDM
Priority: High
Status: Closed
===================
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