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Development Meeting - Virtual - 2021
Dates
Friday August 20th (estimated time period 2 hrs) - 3PM - 5PM UTC
Goals
The main aim is to begin thinking about current planned release of PostGIS 3.2.0 and major features to be attempted.
- wiki:PostGIS32 topics
- GSOC Gist building enhancements for PostgreSQL 14
- PostGIS 3.2 ticket triage
- Need for a postgis_c_api for projects like MobilityDB, h3_pg
- Real World data testing
- Vote: Should our master repo be master or main?
- Add your own … ?
Attendance
PostGIS people who will be there
Put your name on the poll if you plan to attend
Venue
Meeting Notes
Welcome
- Paul Ramsey (Crunchy Data) … coordination towards release time in fall
- Mahmoud SAKR (MobilityDB project, Université Libre de Bruxelles) - Discussing the dependancy of MobilityDB on PostGIS
- Darafei Praliaskouski (Kontur) - XMeans and future of parallel things, H3 things and creation of extensions depending on main PostGIS
- Regina (self)
- Raúl Marín (self)
- Mohamed Bakli (MobilityDB)
- Brian M Hamlin - OSGeo Live DVD
- Bruce Rindahl (self) documentation
- Giuseppe Broccolo - give updates about improvements in GiST build (with Han)
- Han Wang - GiST with pre-sorting methods
- Vicky Vergara (pgRouting & OSGeoLive & MobilityDB)
- Maxime Schoemans (MobilityDB)
- Esteban Zimanyi (MobilityDB)
- Jignesh Shah (AWS) .. learning about PostGIS (More on managing multiple versions)
- Jeremy Schneider (AWS) — PostGIS build considerations
- Aliaksandr Kalenik (Kontur)
Agenda
- GSOC Gist building enhancements for PostgreSQL 14
- Need for a postgis_c_api for projects like MobilityDB, h3_pg
- PostGIS 3.2 ticket triage
- Real World data testing
- Vote: Should our master repo be master or main?
GIST Building GSOC Project
- Good PoC completed
- Uses Pg14 pre-sort hooks in GIST to speed index build
- Index build time is made much faster
- Query performance may be slightly
degraded compared to old implementation w/o pre-sort
- Pre-sort changes low-level page composition a little bit deleteriously
- Need some feedback on query against real-world data sets
- Is the sort key length (32bit) the problem? (Maybe not? Datum size is 64bit on most hardware)
- Q: Do PgSQL implementations of presort also show a performance degredation in query?
- Some degradation is expected. check first: https://observablehq.com/@mourner/hilbert-curve-packing
postgis_c_api
- MobilityDB uses liblwgeom library since PostGIS ~2.3 but can't support 3.x as liblwgeom is not exported
- MobilityDB uses a lot of functions in geography and other analytical functions, not just serialize/deserialize/lwgeom
- LWGEOM is done because Spatialite needed the topology
- Q: Can we provide an example of a "dependent extension" that calls PostGIS functions directly?
- VVergara will continue examining the actual extent of dependency and we will revisit
- Q: Call out pgpointcloud example of non-binary extension dependency
- https://en.wikipedia.org/wiki/GPL_linking_exception#:~:text=A%20GPL%20linking%20exception%20modifies,GPL%20to%20the%20using%20program.
master or main
- master - PR, Regina +1, Giuseppe, MS, Darafei +0 BH +1,JeremyVicky -0
- main - BR, Regina -1, Darafei +1,Jignesh Vicky +0
- Don't care: RM, Darafei +1 MD for now, but plan should be to change to main
Real World Data Testing
- Regina setting up a testing infrastructure - WIP: https://git.osgeo.org/gitea/postgis/postgis-performance
- Real world data sets in the "real" folder
- Example: https://github.com/pramsey/geos-performance/
PostGIS 3.2 Ticket Triage
Alpha Release
Dependent on
- Han's GIST sort merge
- KMeans merge
- Boundary merge
- Paul's three feature tickets
- Paul's crasher tickets
- Sandro's cleanup of topology tickets and feature completion
- Upgrade changes (Regina)
- Address standardizer (Regina)
Target date?
- August 34th
Next Meeting?
- Maybe pre-release 3.2?
- For sure mid-winter (Jan/Feb?) + 1
Note:
See TracWiki
for help on using the wiki.
