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Meeting ID: 293724745

(back to the list of all DMLT meeting minutes)


10:15am 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. 



November DMLT F2F
DM All Hands
  • March 6-8th at IPAC. Systems Engineering will have their All Hands at the same time/place.
  • Need two (or three?) people for organizing committee: help set up agenda/organize rooms etc. Unknown User (xiuqin) as one perhaps?
  • Should move to common Confluence page for the joint meeting.

We agreed that Unknown User (xiuqin), John Swinbank and somebody from NCSA would act as the provisional organizing committee.

DM September Monthly ReportWil O'MullaneInput is due by Tuesday, October 17
LSST Science Platform workshop
  • NCSA, SQuaRE, SLAC team memebers need to start travel requests. Shall we ask help from Unknown User (lpetrick) for hotel arrangement?
  • The meeting will run from mid-day Monday December 4th to mid-day Friday December 8th.
  • Gregory Dubois-Felsmann: Circulate draft agenda for Science Platform workshop, ask team leads to indicate how many of their team will be attending.  
  • Gregory Dubois-Felsmann: Provide Donald Petravick with LDM-542 (Science Platform Design) in a form that is appropriate for editing/marking up with comments.  
Overdue RFCs

RFCs with "Planned end" past "now". (See query table below.)

Change Control Board report
Data Compression WG
  • The RFC is RFC-399 - Getting issue details... STATUS and ready for adoption. I'd request the DMLT to adopt it (on this meeting).
  • The WG chair Robert Gruendl reports that the WG is underresources and unlikely to meet the Oct 31st deadline; would propose that John Swinbank and Robert Gruendl meet to understand & improve the resourcing situation.

We agreed that this RFC cannot be adopted until we properly understanding the resourcing and timeline for this work.

Butler WG
  • Tim Jenness and Jim Bosch will present results from the Butler WG at the November F2F meeting. We expect this to be the conclusion of the Butler WG.
  • In advance of that meeting, they will circulate details of the use cases & requirements they have collected and the proposed design they have produced.
Header Service Design ReviewGregory Dubois-Felsmann (for Kian-Tat Lim)
  • A review of the proposed Header Service (see LCR-) design and requirements was carried out last week at NCSA with the participation of Camera and OCS personnel who were also present for Integration Exercise 5a.
  • Notes are available on Confluence.
  • The review was generally successful: the committee were happy with the basic design of the header service, but some requirements are still unclear and there are loose ends which require chasing down, mostly in the detailed operations concept for the Observatory.
Cross-Subsystem Integration Exercise 5aGregory Dubois-Felsmann

This meeting took place last week to confirm the basic control flow between the OCS and the camera/DM/telescope control systems.

It confirmed that the basic logic for survey observing is executable.

A report on the meeting will be forthcoming, and a further integration exercise will take place in December.

ICD WorkshopGregory Dubois-Felsmann

This meeting took place last week. There are a number of consequences for DM which Gregory Dubois-Felsmann will raise electronically. This will include the format of "TAI" timestamps in telemetry and in databases, closing to changes in LSE-72 (DM-OCS interface) several unfinished LCRs arising from work started at NCSA, and further consideration of the move of the AP system from the Base Facility to the Archive.

DMLT Travel & Availability this week

Overdue RFCs

Key Summary T Created Updated Due Assignee Reporter P Status Resolution

Past action items

Open DMLT actions

DescriptionDue dateAssigneeTask appears on
  • 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
  • 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
06 Jul 2020Wil O'MullaneDM 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
  • 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
29 Jun 2020John SwinbankDMLT Meeting - 2020-06-22
  • Wil O'Mullane — make sure a L2 milestone for the Science Platform exists in P6.  
15 Jun 2020Wil O'MullaneDMLT Meeting - 2020-06-08
  • DMTN-148 is almost there suggest 2 weeks review by DMLT.  
15 Jun 2020 DM Leadership Team Virtual Face-to-Face Meeting, 2020-05-12/14
  • 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
  • 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