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Meeting ID: 293724745

(back to the list of all DMLT meeting minutes)


10:00am PT


DMLT Meeting Goals

  • Weekly meeting to keep the DM leadership team coordinated, informed, and in agreement on the vision, priorities, and challenges facing DM construction, including surfacing and resolving issues and ambiguities needing our attention. The goal of this meeting is to provide information and decisions that help each one of us better direct our own (or our team's) activities.

Discussion Items

Guidelines: Propose items in line with the meeting rationale (see above); include as much information in the agenda notes; summarize, don't go into details while on the call; maximize time available for discussion. 



15 minOverdue RFCs

RFCs with "Planned end" past "now".

Key Summary T Status


  • Discussion of RFC-303 - Getting issue details... STATUS
  • Remove advice to use devtoolset on lsst-dev01 from the developer guide. Kian-Tat Lim
  • Gregory Dubois-Felsmann will take another look at assigning DM-* actions to implement RFC-243 - Getting issue details... STATUS .
  • It was decided by Mario Juric and Unknown User (ciardi) that RFC-221 - Getting issue details... STATUS would be put on hold whilst a new vision document consistent with the LSST Science Platform be written.
5 minOutstanding DMLT actions

See links and action item report below.

25 minChange Control Board report

 Change Control Board meeting.

  • See also Change requests of interest to DM.
  • LCR-795, "Updates to DM/EPO interface requirements (LSE-131)": we have (at least) two substantive objections, which will be posted to the change request by DM staff:
    • Not ready to accept any requirement to provide support for transient analysis on single-epoch saturated objects. Eric Bellm to post a comment to this effect to LCR-795.
    • Cannot accept the requirement to transfer all PVIs every night without substantive cost impact analysis. Suggest additional analysis of what the actual EPO use case is and what other means may be available to satisfy it. Tim Jenness to post a comment to LCR-795 to this effect.
    • Note that the latter issue is coupled with a related issue of whether DM itself may accept a change to store all PVIs on spinning disk and/or to provide a light-curve cutout-delivery service with interactive-analysis-friendly response times.
  • Gregory Dubois-Felsmann recommended we approve LCR-586, "Update LSE-209 Software to OCS ICD", as this supports already-in-process work to prepare for Early Integration Exercise #3.
  • Briefly discussed LCR-908, "Keep all Data Releases loaded in database". Mario Juric would like to proceed with this change request independently of one addressing keeping low-latency access to PVIs. This change request is not up for a vote this week.
  • Jeff Kantor would like to get the long-pending LCR-849, "Update LSE-78 LSST Observatory Network Design" approved. Gregory Dubois-Felsmann recommended using this as a test case for the new process defined by Unknown User (bselvy) for weekly electronic vote opportunities.

10 minPlan for near-term topical meetings
5 minAttendance at major meetings

Discuss DM attendance at:

DMLT Travel & Availability This Week
  • John Swinbank with be in the Netherlands for the BlackGEM FDR, 2017-03-21/24.
Matters arising

Postponed for subsequent DMLT / proposed for future DMLT:


Add new items here....

Past action items

Recently created open actions (from the ~previous two DMLT meetings):

DescriptionDue dateAssigneeTask appears on
  • Colin Slater — Augment LDM-153 to provide a description of the semantics of NULL, NaN, inf, and other database vocabulary.  
06 Jul 2020Colin SlaterDM Leadership Team Virtual Face-to-Face Meeting, 2020-05-12/14
  • Eric Bellm — update time-series technote to contain a discussion of the way in which data will be presented to users.  
01 Jul 2020Eric BellmDM Leadership Team Virtual Face-to-Face Meeting, 2020-05-12/14
  • Fritz Mueller — Draft an technote describing operational procedures for database ingest.  
03 Aug 2020Fritz MuellerDM Leadership Team Virtual Face-to-Face Meeting, 2020-05-12/14
  • Fritz Mueller — engage with the LDF and, as necessary, AP team to best understand the data structures required for the APDB.  
06 Jul 2020Fritz MuellerDM Leadership Team Virtual Face-to-Face Meeting, 2020-05-12/14
  • Frossie Economou— suggest construction milestones for the EFD.   
01 Jun 2020Frossie EconomouDMLT Meeting - 2020-04-06
  • Gabriele Comoretto & Architecture team — ensure a version of the detailed DM product tree (LDM-ized version of DMTN-104) is baselined.  
28 Apr 2020Gabriele ComorettoDM Leadership Team Face-to-Face Meeting, 2019-10-28 to 30
  • Gregory Dubois-Felsmann  — update the Science Platform design documentation to reflect that data access services should be tested with PyVO.  
01 Jul 2020Gregory Dubois-FelsmannDM Leadership Team Virtual Face-to-Face Meeting, 2020-05-12/14
  • Kian-Tat Lim  & Michelle Butler  — propose a design and schedule for deploying a rapid processing system at the LDF.  
29 May 2020Kian-Tat LimDMLT Meeting - 2020-03-02
  • Michelle Butler  & Gregory Dubois-Felsmann  — identify existing requirements, or suggest new requirements, for a user-facing ”bulk-download“ service (but not under that name).  
05 Jun 2020Michelle ButlerDM Leadership Team Virtual Face-to-Face Meeting, 2020-02-25 to 27
06 Jul 2020Robert GruendlDM Leadership Team Virtual Face-to-Face Meeting, 2020-05-12/14