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[LDM #VAP-368514]: Primary/alternate switching mixes in old data with new
- Subject: [LDM #VAP-368514]: Primary/alternate switching mixes in old data with new
- Date: Mon, 23 Nov 2009 11:04:19 -0700
Hi Art,
> On the latency chart for CONDUIT data for system iddrs3.meteo.psu.edu at:
>
> http://www.unidata.ucar.edu/cgi-bin/rtstats/iddstats_nc?CONDUIT+iddrs3.meteo.psu.edu
>
> I've been investigating the latency spikes.
Some of those spikes are pretty big (over 6000 seconds). What's the maximum
data-product latency that you allow on your LDM system? Do you invoke
"ldmadmin start" with a "-m maxLatency" option? What is the output of the
command "ldmadmin config | grep latency"?
> System iddrs3 pulls CONDUIT
> .* from idd-ingest.meteo.psu.edu primary and idd.cise-nsf.gov secondary.
> idd-ingest.meteo.psu.edu pulls CONDUIT .* from only idd.cise-nsf.gov. It
> appears that when these spikes occur, reception switches from
> idd-ingest.meteo.psu.edu to idd.cise-nsf.gov as primary and, for some
> reason, starts feeding very old data interspersed with new data. I don't
> believe we're losing data, just that old data is being resent (I think).
> It doesn't do this every time it switches, just sometimes. I don't
> believe this occurs when it switches to idd-ingest.meteo.psu.edu as
> primary (at least not that I've observed) which would agree with the
> graphic. Any ideas what could be causing this?
I have some ideas, but they need to be verified. Please send me the answer to
my question and also the output from the following command:
fgrep '[<pid>]' $HOME/logs/ldmd.log | fgrep 'LDM-6 desired product-class'
where <pid> is the process identifier of the downstream LDM that receiving
CONDUIT data from "idd.cise-nsf.gov".
> FYI, I upgraded to LDM V 6.8.1 yesterday (Nov 20th) at ~16:30Z to see if
> that would help. Prior to that I was running LDM V 6.7.0.
>
>
> Thanks...
>
> Art
>
> Arthur A. Person
> Research Assistant, System Administrator
> Penn State Department of Meteorology
> email: address@hidden, phone: 814-863-1563
Regards,
Steve Emmerson
Ticket Details
===================
Ticket ID: VAP-368514
Department: Support LDM
Priority: Normal
Status: Closed