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[LDM #RTA-128892]: Interpretation of "INFO sending" and "error.c:err_log:236"



Gregg,

> Thanks for the information.
> 
> While I was searching the archives last night I noticed a number of INFO
> sending entries in other emails with NO error messages.
> 
> So what causes the error message?

It's not an error message. It simply indicates what data-product is about to be 
sent.

> I ask because there is some limited bandwidth issues between the upstream
> LDM and downstream LDM within the local LAN (e.g. < 1 Mbps, when the
> network is 1 Gbps, there are some switches and firewalls between the two
> LDM systems).  So the upstream LDM has lots of data being inserted into the
> queue, but the downstream LDM doesn't receive it all.  Thus, I was thinking
> the error in the log file was something to do about a failure in deliverysimpl
> on the system being described, as the systems in the email archives didn't
> always have the error message.

If the connection from the sender to the receiver is sufficiently slow, then 
the latency of the data-products will slowly increase until it is greater than 
the maximum latency parameter in the LDM registry. At that point, the received 
data-products will simply be discarded rather than being inserted into the 
product-queue.

The connection can be slow because of insufficient bandwidth or because 
something between the sender and receiver is discarding packets (e.g., a 
firewall, traffic throttling system, or intrusion prevention system).

Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: RTA-128892
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.