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19991221: Y2K LDM pqact.conf change for NLDN lightning data products (fwd)


===============================================================================
Robb Kambic                                Unidata Program Center
Software Engineer III                      Univ. Corp for Atmospheric Research
address@hidden             WWW: http://www.unidata.ucar.edu/
===============================================================================

---------- Forwarded message ----------
Date: Tue, 21 Dec 1999 14:40:26 -0700
From: Unidata Support <address@hidden>
To: address@hidden, address@hidden,
     address@hidden
Subject: 19991221: Y2K LDM pqact.conf change for NLDN lightning data products

>From: Unidata User Support <address@hidden>
>Organization: Unidata Program Center
>Keywords: LDM pqact NLDN pattern action

Users of NLDN Lightning Data:

This is an advisory for sites using the NLDN lightning data from Suny
Albany.

Lightning products in the NLDN data stream are currently sent out with
names that follow the following naming convention:

    YYJJJHHMbMe
     ^  ^ ^ ^ ^__ ending minute bin
     |  | | |____ beginning minute bin
     |  | |______ hour [00..23]
     |  |________ Julian day of the year [1..366]
     |___________ two digit year [00..99]

At one time, the pqact.conf regular expression pattern recommended by
Unidata for these products was:

NLDN    ^(9[3-9])([0-3][0-9][0-9])([0-2][0-9])([0-5][0-9])([0-5][0-9])

Since this pattern will only match NLDN products whose YY portion lies
between 90 and 99 it will break at sites still using it beginning
January 1, 2000.

The YY portion of the NLDN product name for the year 2000 will be
either 00 or 2000;  we are leaning towards use of 4-digit years.

We are, therefore, advising sites to change their pqact.conf NLDN
entry(ies) to:

NLDN    ^([12][0-9][0-9][0-9]|[0-9][0-9])([0-3][0-9][0-9])([0-2][0-9])([0-5][0-9
])([0-5][0-9])

This pattern will match products using either 2-digit (00 through 99)
OR 4-digit (1000 through 2999) year components.

In order to implement this change, you must:

1. login as the user running your LDM

2. change to the 'etc' directory:

   cd etc

3. edit pqact.conf and change all NLDN entry patterns to match the
   recommendation above.

   NOTE:
     o make sure that 'NLDN' are the first characters on the line (i.e.
       spaces before 'NLDN' are not allowed)
     o make sure that there is only a tab character between 'NLDN' and '^'
     o if you cut and past the recommendation above, make sure that a line
       break is NOT introduced into the pattern

4. get the process ID of 'pqact':

   ps -eaf | grep pqact

5. send a HUP to 'pqact' telling it to reread pqact.conf:

   kill -HUP <pid_of_pqact>

6. verify that 'pqact' reread the configuration file AND there were no
   errors by looking at the tail of the LDM log file:

   tail -40 ~/logs/ldmd.log

7. if the LDM log file has a warning about a pqact.conf error, repeat steps
   3 - 6.
  
Please contact Unidata User Support at the address below if you have any
questions or problems with this change.

Tom Yoksas