Re: {bb} Statrrd error message

[Rolf Schrittenlocher <Schrittenlocher@rz.uni-frankfurt.de>]

Hi,

for us it doesn't happen with BB but with hobbit (we are moving from bb 
to hobbit but still have both programs running parallely for comparison 
reasons). In BB we don't use larrd. Nevertheless larrd is the same for 
bb and hobbit so the problem should be comparable. There is no regular 
intervall, it happens occasionally but quite frequently (yesterday 20 
times for about 10 hosts running two client instances). The interesting 
fact would be: How determines larrd that those messages are identical 
although they aren't - at least in our case. They are sent from the same 
physical machine but by different virtual hosts with different IP and a 
different point of starting time of the client. If there is no error and 
the message is written, it is associated to the right virtual host.  I 
don't think that protecting the database from updates to frequently made 
is an issue as hobbit has polling intervalls by default of 1 minute and 
there are guys who monitor large networks with hundreds of machines with 
it. There were no reports of that kind of problems with larrd yet on the 
hobbit list. So the issue is that those message are coming from the same 
machine. And I assume that larrd is using other criteria than IP or name 
to determine if it should store these data or refuse it.
Rolf

> Don't know statrrd.sh but the root issue would be that rrdtool protects
> against updating statistics databases too frequently. 
>
> Does it happen every time you start up BB, or does it happen once per
> update cycle?
>
> Have you tried stopping BB, and then double and triple-checking with PS
> to ensure all associated processes have been terminated before
> restarting? Either you have two processes trying to store the same data
> at nearly the same time, or your system thinks that two different pieces
> of data belong in the same file, or -- this happened to me a couple
> times when troubleshooting custom larrd scripts -- you restarted too
> quickly and it is trying to update a database it had just updated.
>
>
> -----Original Message-----
> From: owner-bb@bb4.com [mailto:owner-bb@bb4.com] On Behalf Of Rolf
> Schrittenlocher
> Sent: Thursday, February 23, 2006 7:05 AM
> To: bb@bb4.com
> Subject: Re: {bb} Statrrd error message
> Importance: Low
>
> Hi,
>
> we have the same phenomena while running more then one instance of a 
> client on one machine using different names for $MACHINE and different 
> IP. Starting the second (and third) client with delay helps for some 
> time, then the problem occurs again. After a while (~ 1h) it seems that 
> the two processes differ again and the problem doesn't occur until next 
> time. In our case it is not BigBrother (there we don't use rrd) but 
> hobbit but that shouldn't matter.
> Unfortunately I haven't found a solution for that and I didn't dive into
>
> larrd source code as my C isn't that good.
>
> kind regards
> Rolf
>
>  
>
> > Hi,
> >
> > We have been running Big Brother for years including statrrd but
> > recently I have been getting the following error messages in BBOUT
> >    
> every
>  
>
> > time it runs.
> >
> > ERROR: illegal attempt to update using time 1140691546 when last update
> > time is 1140691546 (minimum one second step)
> > /export/home/bb/bb/ext/statrrd/statrrd.sh: line 51: [: =: unary
> >    
> operator
>  
>
> > expected
> >
> > I get about 5 of these messages and I can't understand why this has
> > suddenly started happening as I havn't changed the statrrd.sh script at
> > all, The graphing is working fine as far as I can see. Any help or
> > suggestions would be greatly appreciated as its been driving me nuts
> >    
> for
>  
>
> > a couple of days now. 
> >
> > Thanks
> >
> > -----------------------------------------
> > Andrew Crowe 
> >
> > System Programmer
> > ITS
> > Durham University
> >
> >
> >
> > --
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> >
> >
> >    
>
>
>  


--
Mit freundlichen Gruessen
Rolf Schrittenlocher

HRZ/BDV, Senckenberganlage 31, 60054 Frankfurt 
Tel: (49) 69 - 798 28908   Fax: (49) 69 798 2881
LBS: lbs-f@mlist.uni-frankfurt.de
Persoenlich: schritte@rz.uni-frankfurt.de

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