Re: [Condor-users] DC_AUTHENTICATE: sent DC_INVALIDATE

[Johnson koil Raj <johnson.raj@xxxxxxxxx>]

Hi Zachary,

	Thanks for your replay.

But I already have the UPDATE_INTERVAL = 15 for both MASTER and STARTD 
(15 sec for showing current status quickly)

This set up works fine when my pool have condor 7.0.1 in all system     
I have restarted Collector(Central Manager) only. That time there is no such issue about session.

so what went wrong...

by
Johnson

---

On Fri, 2008-07-18 at 09:29 -0500, Zachary Miller wrote:
> > 7/18 18:43:42 DC_AUTHENTICATE: attempt to open invalid session
> > scorpio:28204:1216378448:16, failing.
> > 7/18 18:43:42 DC_AUTHENTICATE: sent DC_INVALIDATE
> > scorpio:28204:1216378448:16 to <10.201.42.234:55636>.
> > 
> > If I restart the Executor Machine Manually.Then only it is showing up
> > while Checking condor Status.
>
>
> hello,
>
> after restarting your collector, it could take 5 to 10 minutes (using the
> default configuration) for the machine to show up again in the collector.
> but if you wait, it definitely should.  this is normal behavior.
>
>
> here's a more detail explanation for anyone interested:
>
> the collector and startd have established a security session.  when the
> collector gets restarted, it loses its side of the session.  the next time the
> startd tries to update the collector, it does so using the old session, which
> fails (the log message "attempt to open invalid session").  the collector then
> sends a UDP message (the log message about DC_INVALIDATE) to the startd to let
> it know that it needs to clear the old sessions and start a new one.  after
> that, things should work fine.
>
> as to why the other machine showed up without restarting, it is just a matter
> of timing.  startd updates to the collector normally occur every 5 minutes.
> i'm guessing the windows machine just happened to get through the above process
> first.  eventually (within 10 minutes) all machines should be reporting to the
> collector without restarting them.
>
> you can change this default of 5 minutes to something shorter if you want the
> machines to show up more quickly after a restart.  you could try setting:
>   UPDATE_INTERVAL = 60
>   # one minute update interval
>
> then machines will report much more often to the collector.  the upside is
> that your pool will be back to normal after 2 minutes instead of 10.  the
> downside is increased network traffic to your collector.  if you have a
> large enough pool, making the UPDATE_INTERVAL too small will eventually
> overload your collector.
>
> i hope this helps, and please let me know if you have more questions.
>
>
> cheers,
> -zach
>
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