Re: 19990915: LDM Bug?

On Thu, 16 Sep 1999, Paul Hamer wrote:

> Robb,
> 
> >From your man pages on notifyme.
> 
> 
> 
>       NAME
> 
>            notifyme - ldm NOTIFYME example client
> 
>       UNIX SYNOPSIS
> 
>            notifyme [-x -v] [-l logfile] [-h remote] [-p  pattern]  [-f
>            feedtype] [-o offset] [-t timeout] [-T TotalTimeo]
>       
>       DESCRIPTION
> 
>            This program receives notification messages from the Unidata
>            Local Data Management system (ldm) and optionally prints the
>            notification information with timestamps.  It calls up  with
>            the  LDM  server  at remote and requests notification of the
>            arrival data whose  identifier  matches  pattern.   As  data
>            arrives  at  the  server,  notification is sent to this pro-
>            gram.
> 
> 
> The guys here that took you course assured me that we could use this
> utility to receive confirmation from the remote host that it had received
> the product we had just sent. It does connect to the remote LDM, we
> couldn't run this at first because the remote sites firewall wouldn't
> accept the host from which we were running notifyme. In the description
> above it refers to the "LDM server at remote" what does that mean if
> it is not the remote host we were checking? It also says "notification of
> the arrival data" not sent, but arrival. I know it was sent by looking
> at my end.

Paul,

I misunderstood what you were saying. Yes if you use the -h flag then you
can determine that a particular product was received at a remote host.  

> 
> There were no messages in the ldmd.log indicating that the execute
> permission was the problem.
> 

For the script problem, I tried it on our LDM and here are the messages:

Sep 17 18:44:25 zero.unidata.ucar.edu pqact[17410]: child 25688 exited
with status 127
Sep 17 18:44:29 zero.unidata.ucar.edu pqact[17410]: child 25690 exited
with status 127


Robb...

> And yes, whilst I agree that had the person on the remote site checked
> his configuration more carefully we would not have had the problem I still
> think that notifyme did not behave as advertised and ldmd.log or pqact.log
> should contain a meaningful error message.
> 
> Paul.
> 
> 
> Robb Kambic wrote:
> > 
> > On Wed, 15 Sep 1999, Unidata Support wrote:
> > 
> > >
> > > ------- Forwarded Message
> > >
> > > >From: Paul Hamer <address@hidden>
> > > >Subject: LDM Bug?
> > > >Organization: NOAA/FSL
> > > >Keywords: 199909152236.QAA19761 LDM
> > >
> > >
> > > I would like to report a possible LDM bug.
> > >
> > > The configuration used pqact to execute a perl script upon receipt
> > > of a certain product. The sending ldm server host was running a
> > > notifyme for receipt confirmation.
> > >
> > Paul,
> > 
> > The notifyme did exactly what it was designed too.  Notified you that the
> > product was sent. There is no connection to the receiving LDM.
> > 
> > > When the perl script does not have execute permission at the receiving
> > > end no confirmation of receipt iss received even though the product
> > > is in the target hosts product queue. Further, no indication of
> > > a failure to execute the script was found at either end.
> > 
> > There probaby was a message in the ldmd.log file, but not the kind you
> > where expecting. If you look at the log file, there would be a line
> > stating pqact subprocess exiting with some type of signal. Because the LDM
> > forks the processes the name of the subprocess and the text of the error
> > messages are lost. The common process of testing pqact entries is to run
> > the entry as stated in pqact.conf from the command line as user LDM from
> > LDM home. This would of caught the error immediately.
> > 
> > Robb...
> > >
> > > Obviously having found the problem in this instance we have fixed
> > > that config but it would seem that LDM should:
> > >
> > > 1. Be able to satisfy the notifyme query  (if not perhaps give
> > > some clue as to why); and
> > >
> > > 2. pqact should log the failure of a non-executable target script
> > > or binary.
> > >
> > > Thanks,
> > >
> > > Paul.
> > >
> > > --
> > > Paul Hamer
> > > Email: address@hidden
> > > Phone: 303.497.6342
> > >
> > >
> > > ------- End of Forwarded Message
> > >
> > 
> > ===============================================================================
> > Robb Kambic                                Unidata Program Center
> > Software Engineer III                      Univ. Corp for Atmospheric 
> > Research
> > address@hidden                   WWW: http://www.unidata.ucar.edu/
> > ===============================================================================
> 
> -- 
> Paul Hamer
> Email: address@hidden
> Phone: 303.497.6342
> 

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