SLAC/ATLAS TDAQ Meeting, May 24, 2007

Present: Andy, Ignacio, Sarah, Rainer, Amedeo (phone)


DbProxy:

The version 4 logfiles almost look like the client is using the wrong
password. This appears to have happend only on some nodes. Amedeo
suggests to replace ERS_DEBUG with ERS_INFO in the proxy code to
reenable the debug messages and better see what is going on. Andy
points out that with all that is going on at Point 1, doing the
debugging will be easier on the SLAC farm. That's provided of course
the problems are reproducible at SLAC. The problem was seen here with
LVL2, which is what we have been running at SLAC also. So it makes
sense if Andy will run the code at SLAC first, putting a proxy in
manually and trying to configure LVL2. He needs the location of
version 4 on the SLAC farm. Amedeo will tell Andy where the compiled
executables are once they are ready.

The very latest version that Amedeo made, let's call it 401, has a
change that only the first authorization is processed. All further
authentications are then blindly accepted. On the SLAC farm all
challenges are identical. But at Point 1 there are different
ones. Presumably they are seeded in some host-specific way. Amedeo
suggests that it may be that all challenges of the first type that
goes through are accepted, but that different ones coming through the
same top level proxy.

Version 3, after bumping up the system limits, has been working well
at Point 1. So it is what people will want to use for remaining test,
unless it hits some new limits. The only flaw may be the wrap-around
problem in the time-stamps, which affects about 50% of the debugging
output, though. We could prepare a version 3a with that fixed if we
were to stick with that version. Version 4 on the other hand lacks
some of the debug instrumentation (until ERS setting is changed) and
it has the new connection issues.

Amedeo suggest building two excutables: version 4 with the above
changes, plus one that authorizes only the first client, version 401.
Will then test both of these at SLAC.  If they work there, we'll talk
again, if not, fix them and go back to Point 1.

Action items:

- Sarah will send her proxy instrumentation to Amedeo.
- Amedeo will merge this into CVS.
- Amedeo makes the ERS_DEBUG to ERS_INFO change.
- Amedeo build version 4 as well as 401 at SLAC and point Andy to it.
- Andy will test L2 + Proxy at the SLAC farm.
- We'll decide if Version 4 is ready to be installed in Point 1.