so here's a wierd one

[Gerry Creager]

Chiz can correct me if I'm really mistaken, but the later versions of 
LDM ignore PRIMARY||ALTERNATE if you have two *identical* requests and 
try to get the lowest latency one.  That they bounce back and forth 
doesn't imply you get the whole backlogged queue, however, as in 6.6.x a 
file's written that says where it's got current data to, and upstreams 
are advised of this, and should send data from that point on, rather 
than the entire contents of the ldm.pq...

gerry

Daryl Herzmann wrote:
> Hi Tyler,
> 
> Do your log files show your LDM switching feeds when data starts flowing 
> again?
> 
> I can't seem to fully resolve it, but the newer LDM seems to get 
> confused when you have multiple hosts feeding you the same data types 
> without specifying PRIMARY ALTERNATE. I dunno, I'm running into all 
> sorts of strange LDM things lately :(
> 
> daryl
> 
> On Mon, 2 Apr 2007, Tyler Allison wrote:
> 
>> [for ldm-6.6.0 and ldm-6.6.2]
>>
>> If I use the following feed pattern [upstream = idd at wisc and 
>> bigbird at tamu]:
>>
>> request WMO
>> "((WF|WO|WU|WR|WW|WG|AC|NW)US)|^S[AP]|^S[NS]|^WT(PZ|PN|PA|NT)|(^S[IMN]V[^GINS])|(^S[IMN]W[^KZ])|(^S(HV|HXX|S[^X]))|(^SX(VD|V.50|US(2[0-3]|08|40|82|86)))|(^Y[HO]XX84)|^A 
>>
>> CUS11|/p(FTM|FWDDY)" upstream.server.edu
>>
>> the data seems to flow down to me in "chunks". What I mean by this is 
>> that
>> is when I run 'ldmadmin watch' I see no data for between 4 and 10 
>> minutes.
>> Then all of a sudden the last 4-10 minutes worth of data comes down 
>> within
>> a 3 second period. It then holds again...and 4-10 minutes later another
>> payload of data comes down...etc...etc.
>>
>> If the *ONLY* thing I change is the feed pattern to:
>>
>> request WMO ".*" upstream.server.edu
>>
>> The data feed runs normal.
>>
>> I'm confused! I, and the upstream, have bandwidth to burn so I'm leaving
>> the feed as ".*"...my pattern was attempting to conserve bandwidth for 
>> the
>> upstream providers but it seems I did more harm than good.
>>
>> I havent totally verified this issue but it seems to be the culprit. Can
>> anybody confirm?
>>
>> -Tyler
>>
>>
> 
> /**
>  * Daryl Herzmann, RHCE
>  * Program Assistant -- Iowa Environmental Mesonet
>  * http://mesonet.agron.iastate.edu
>  */
> 
> 

-- 
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University	
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