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[Support #MMY-940696]: radar3 LDM user latencies



Holly,

> We did have one customer who has a redundant request.  Yesterday I noticed
> one pull from College Park and one from Boulder, but today I see 2 requests
> for the same data in Boulder.  One of them is delayed and my logs say
> "Terminated obsolete upstream LDM" because of this.

Don't do that. Multiple identical subscriptions from a downstream site to an
upstream site will cause the downstream LDM processes to take turns
terminating their associated upstream LDM processes.

> We failed out to
> Boulder yesterday due to these latency issues.   Dual pulling isn't
> something we have actively suggested our users do only because even though
> the data has the same name, the content could be different and will not get
> duped out because the md5 checksum is different.

> > Do all of your customers have the same REQUEST entries (i.e., for the same
> > feedtype and pattern)?

> I see a few flavors of basically the same thing, is one of these better or
> worse than the others?  We do not have any EXP data, everything is going
> out with the feed type NEXRAD3 (or FT27).
> 
> NEXRAD3, ".*"

This will get everything in the NEXRAD3 feed.

> NEXRAD3, (^wsr88d[0-9]*\.tbz2$)

The parentheses are unnecessary. This subscription is identical to the
previous one if and only if every data-product in the feed matches the
regular expression.

> NEXRAD3, "^wsr88d......tbz2

Depending on the data-product identifiers, this will receive the same
set of data-products as the previous subscription or a set that overlaps the
previous subscription.

> EXP|NEXRAD3, "^wsr88d[0-9]*\.tbz2"

This will receive the same data-products as the second subscription if and
only if not data-products exist that match the above reqular expression and
that have something after the "tbz2".

> EXP|NEXRAD3, ".*"

Because you don't have any EXP data-products, this subscription is the same
as the first one.

> > Please keep us apprised.
> 
> Will do, we will be asking one user with known issues to pull from College
> Park directly to help us troubleshoot.  Thanks for the information Steve,
> much appreciated!

Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: MMY-940696
Department: Support LDM
Priority: Normal
Status: Closed
===================
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NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.