Attending: Marian, Derek, Andy, Diego, Ilija, Matevz, Matyas
Development (Andy reporting)
- Working on the checksumming “stuff”
- Finishing checkpointing in xroot
- Zip files are popular
- Want to append to zip files.
- Checkpoint changes to file, restore the file.
- Updates to zip file without worry about corrupting file.
- Token handling with client comes to server
- Client will present token to “something” (server)
- A plugin will verify the token was issued by some issuer
- Identical to scitokens handling tokens
- Not authenticating yet, just showing proof that the user “belongs”
- The issue is that many operations in the xrootd server can be performed without authentication.
- Andy - RAL is running 600+ xcache instances, probably on worker nodes
- Andy wants to add a “call home” UDP packet on xrootd startup.
- Have some data about the server, hostname, if xcache,…
- Discussion about technical details about how store and send this data
- Maybe not UDP, may not be the best way to send data
- Andy talked with others about tagging XRootD packet marking
- Be able to tell the kernel what the packet is “for”
- Slow moving progress.
- Goal is to categorize traffic
ATLAS (Ilija reporting)
- 1 more xcache deployed in slate
- All of US ATLAS are now running a XCache. All are in slate except BNL.
- gfal-copy causing occasional failures, Ilija investigating
- Limiting UDP packets?
- Ilija would prefer a default small packet size because of large packet sizes across routers are difficult
CMS
OSG (Matyas reporting)
- Holding off on releasing 4.12.4 because of failures in testing at UCSD
- It is refusing to startup due to configuration issue
- Diego will investigate.
- OSG and Ilija should talk so Ilija can use atlas-xcache containers directly.
- Ilija likes the fast changes enabled by using his own dockerfile
- OSG wants to be able to label an atlas-xcache container as “stable” because it’s used by Ilija.
- No update from John Hicks.
- xrootd #1279: https://github.com/xrootd/xrootd/issues/1279
- Andy would like to close it.
Ricardo
- Dress rehearsal of data lake in November
- XCache inclusion
- Requested server from CERN for XCache
There are minutes attached to this event.
Show them.