wiki:developers-meeting-20141119
Last modified 5 years ago Last modified on 11/21/14 15:04:44

[part of a series of meetings]

Participants

Christian, Al, Paul, Tigran, Karsten, Gerd, Dmitry

Agenda

[see box on the right-hand side]

Postcards

Up to two minutes (uninterrupted) per person where they can answer two questions:

  • What I did last week (since the last meeting),
  • What I plan to do in the next week.

No questions until we get through everyone :)

Karsten:

Preparing presentation, Reviews, Tickets

Christian:

Cleaning up and fixing tickets from 2014 toill now

Tigran:

  • Loking for NFS problem with cloud, have a couple of ideas: there are a lot of r/w operations and mixed in which causes error messages
  • Investigated running dCache on ARM A7 CPUs in HDD. Installed everything, but performance so far looks poor. will talk to them again.
  • CERN Workshop on Clouds and more
  • Cleaned up patches and patch for setting atime

Gerd:

  • Continued investitgation of Alice transfers
    • There are some issues due to missing synchronisation between staging files at CERN and NDGF
  • created some patches concerning errors

Paul:

  • Cloud workshop at CERN with about 100 people.
  • Organizing more meetings
  • fixing things

Dmitry:

  • Preparing for moving

Al:

  • Dealed with some Wicket problems
    • One needs still some cleaning up -> suggest to upgrade to Wicket 6
    • Found another issue with XML datastore. There is a patch waiting to be published.
    • Worked on restructuring a patch from some weeks ago, close to finishing.
    • Answered some tickets (RRD)

Special topics

LRU

https://srm.fnal.gov/twiki/bin/view/DcacheCorner/LruPlot based on sweeper get lru.

It looks like the sweeper removed files based on file age rather than last access time.

Looks like the confusion was caused by using "-f" option.

-> Columns were confused and columns misunderstood.

The value is used to determine how long a file is on pool before it gets flushed to tape.

Paul and Tigran @ CERN

2 days workshop with 100 people. Talks are online + Videos.

Talked to OwnCloud? Staff regarding our DESY instance/use-case.

  • redirection
  • ACL synchronisation

Will organize meeting with them at DESY

  • Other teams presented their cloud solution.
  • IBM presented OwnCloud? on gpfs. showed that
  • Talk about JIT data analysis
  • Sync and Share, tester QuickCheck?
  • CERN also tries to have a Cloud solution based on EOS, working also with other protocols With a little more clever way of finding changed files

Suggest to watch Keynote Speech about how to find problems in things that are hard to test!

-> Hopefully better contact with OwnCloud? people and meeting

Progress with new features...

Tigran:

File attribute update path: will change chimera, access latency to improve performance

Gerd:

Did we consider or check performance for conversing keys to INT64 instead of STRING. -> Can try, but this might confuse users more (Tigran)

Issues from [FIXME: Add link to yesterday's Tier-1 meeting]

Paul: Thursday:

Fermi:

Mountpoint hanging, should they use 4.1 or 4.0? dccp on NFS4.1 mount in 2.2 may cause mount to hang. They needs mkdir, so 3 would be good enough. -> Advised them to use 4.0

...

Plans for patch-releases

Should we make a new patch release?

Releases on Tuesday.

Outstanding RT Tickets

Review of RB requests

Please have a look at 7499

New, noteworthy and other business

DTNM

Proposed: same time, next week.