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[LDM #YOW-752087]: LDM transfer mode / terminating

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  • Subject: [LDM #YOW-752087]: LDM transfer mode / terminating
  • Date: Fri, 21 May 2021 08:52:58 -0600
> "it" referring to the upstream servers (serving the data).  Usually one, but 
> sometimes both.  Just over the night, I noticed it happened again after 15 
> hours of running.  And there are a bunch of defunct ldm processes.
> 
> 10383 ?        Ss     0:01 ldmd -I 0.0.0.0 -P 388 -M 256 -m 3600 -o 1800 -q 
> /opt/ldm/var/queues/ldm.pq /opt/ldm/etc/ldmd.conf
> 10386 ?        S      0:03  \_ rtstats -h rtstats.unidata.ucar.edu
> 10387 ?        S      7:14  \_ ldmd -I 0.0.0.0 -P 388 -M 256 -m 3600 -o 1800 
> -q /opt/ldm/var/queues/ldm.pq /opt/ldm/etc/ldmd.conf
> 10388 ?        S      0:00  \_ ldmd -I 0.0.0.0 -P 388 -M 256 -m 3600 -o 1800 
> -q /opt/ldm/var/queues/ldm.pq /opt/ldm/etc/ldmd.conf
> 11872 ?        Z      0:00  \_ [ldmd] <defunct>
> 11874 ?        Z      0:00  \_ [ldmd] <defunct>
> 11889 ?        Z      0:00  \_ [ldmd] <defunct>
> 11897 ?        Z      0:00  \_ [ldmd] <defunct>
> 11898 ?        Z      0:00  \_ [ldmd] <defunct>
> 11905 ?        Z      0:00  \_ [ldmd] <defunct>
> 11915 ?        Z      0:00  \_ [ldmd] <defunct>

The log messages from your upstream LDM mean that it received a request for 
data from a downstream host that was identical to a feed it was already sending 
that host.

This could be due to several things. Possibilities include
    1) Duplicate or overlapping REQUEST entries in the downstream LDM's 
configuration-file;
    2) Multiple downstream LDM-s behind a network address translation (NAT) 
device making the same request;
    3) The connection with the downstream LDM getting broken but the upstream 
LDM not being notified.

We've seen #2 many times. The log message should tell you the IP address of the 
downstream host.

> Also, I'm on version 6.13.7.54 on CentOS 7.9

Hmm... alpha/beta versions of the LDM aren't intended for general use.

Can you upgrade to version 6.13.13?

Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: YOW-752087
Department: Support LDM
Priority: Normal
Status: Closed
===================
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