ARC7 technical workshop in Lund

4 May 2022, 10:00 → 5 May 2022, 18:30 Europe/Stockholm

H322, H422 and K262 (Fysicum)

The NorduGrid Collaboration invites ARC developers, system administrators and interested ARC users to our next face to face workshop in Lund, Sweden. The purpose of the workshop is to discuss the next major ARC release, the ARC 7.

Preliminary schedule is organized as:

• Wednesday: ARC 7 content discussion
• Thursday: ARC 7 preparation timeline, testing and roll-out discussion

Participation is free of charge while registration is mandatory!

 

A-REX-LRMS-internals-Aleksandr.pptx

aCTReport.pdf

Workarea

Wednesday 4 May

10:00 → 21:30 Day 1

ARC 7 content discussion

10:00 Welcome and introduction

Speaker: Balazs Konya (Lunds universitet)

10:45 REST in ARC7

The purpose of this session is to collect feedback on the REST interface already deployed at many sites.

Discuss if any interface specification adjustment is needed for ARC7

11:15 Accounting in ARC

-Quick overview, most common issues, whishlist for
improvements

-Treatment of multiple benchmarks

13:20 lunch

14:25 Scalability: the new controldir structure

During this session we will discuss howto test and roll-out the available new feature Aleksandr developed.

The new controldir structure is going to be one of the major backward NON compatible changes in ARC7

15:00 Condor and ARC7

A dedicated slot to understand nothing will be broken with Condor. Please note in September there'll be a more detailed hackathlon with ARC and Condor involved

15:30 Hunting for the missing walltime: how ARC internals and LRMS interacts with each other

This session will discuss how information is propagated among various ARC internals (such as AREX, Backend scripts, accounting subsystem) and the local batch system (LRMS). We will use the "missing walltime" puzzle as an example (see bug 4050).

16:35 Interface consolidation plans in ARC7

Time to figure out what to do with all those legacy, semi-legacy interfaces we have in ARC6 now that the REST interface is production-ready.

This session will try to decide which interface to keep and which one we can label obsoleted or even remove from ARC7.

By ARC inteface we mean both the job management (gridftp-job, emies, REST) AND the information retreival intefaces (LDAP-ng, LDAP-nordugrid, LDAP-glue2, glue2-xml, rest-xml)

19:30 Dinner

http://www.rauhrackel.se/

Thursday 5 May

09:00 → 13:05 Day 2a

ARC 7 preparation timeline

09:15 A new ACT client

09:50 Job description in ARC7

ARC 7, being a major release, allows us to make non-backward compatible changes.

Therefore this is our time window to make any minor/major non-compatible changes in the job description area, let it be modifying some parameters in XRSL or even proposing to drop some supported job description format or introduce a complete new thing

10:50 Tokens and non-tokens in ARC7

Discussion block to see if the current status of token support in ARC is sufficient and how the token world can be combined with the x509-world in ARC7

11:50 ARC.CONF

12:20 ARC 7 Documentation

12:35 → 13:35 lunch

13:35 → 18:30 Day 2b

ARC 7 testing and roll-out

14:10 The "old-code" laundry list of Mattias

This block is to understand which code parts are "aging bad", i.e. which components, libraries, code parts will soon cause us headaches because of difficult maintenance or because there are targeted for discontinued support in newer distributions.

Mattias Ellert and Anders Waananen will bootstrap the discussion.

15:10 Obsolete and Retire in ARC7

Discussion block to figure out which functionality is not used any longer by ur community, what services/features we can drop from ARC7 for various reasons

16:15 Last minute feature request for ARC7

Here we will check if there is any last minute wish for ARC7 that we still can realistically implement to be included in ARC7

16:45 ARC7 release preparation timeline

17:25 wrap up