9-13 July 2018
Sofia, Bulgaria
Europe/Sofia timezone

Understanding the evolution of conditions data access through Frontier for the ATLAS Experiment

10 Jul 2018, 16:00
1h
Sofia, Bulgaria

Sofia, Bulgaria

National Culture Palace, Boulevard "Bulgaria", 1463 NDK, Sofia, Bulgaria
Poster Track 3 – Distributed computing Posters

Speaker

Michal Svatos (Acad. of Sciences of the Czech Rep. (CZ))

Description

The ATLAS Distributed Computing system uses the Frontier system to access the Conditions, Trigger, and Geometry database data stored in the Oracle Offline Database at CERN by means of the http protocol. All ATLAS computing sites use squid web proxies to cache the data, greatly reducing the load on the Frontier servers and the databases. One feature of the Frontier client is that in the event of failure, it retries to different services. While this allows transient errors and scheduled maintenance to happen transparently, it does open the system up to cascading failures if the load is high enough.

Throughout LHC Run 2 there has been an ever increasing demand on the Frontier service. There have been multiple incidents where parts of the service failed due to high load. A significant improvement in the monitoring of the Frontier service was required. The monitoring was needed to identify both problematic tasks, which could then be killed or throttled, and to identify failing site services as the risk of a cascading failure is much higher. This presentation describes the implementation and features of the monitoring system.

Primary authors

Michal Svatos (Acad. of Sciences of the Czech Rep. (CZ)) Alessandro De Salvo (Sapienza Universita e INFN, Roma I (IT)) Alastair Dewhurst (STFC-Rutherford Appleton Laboratory (GB)) Emmanouil Vamvakopoulos (Centre de Calcul IN2P3 (FR)) Julio Lozano Bahilo (Univ. of Valencia and CSIC (ES)) Nurcan Ozturk (University of Texas at Arlington (US)) Javier Sanchez (Universidad de Valencia (ES)) Dave Dykstra (Fermi National Accelerator Lab. (US))

Presentation Materials