2016-10-25 15:00:44 +00:00
|
|
|
--TODO: Find a way to nicely generalize landcover
|
|
|
|
--CREATE TABLE IF NOT EXISTS landcover_grouped_gen2 AS (
|
|
|
|
-- SELECT osm_id, ST_Simplify((ST_Dump(geometry)).geom, 600) AS geometry, landuse, "natural", wetland
|
|
|
|
-- FROM (
|
|
|
|
-- SELECT max(osm_id) AS osm_id, ST_Union(ST_Buffer(geometry, 600)) AS geometry, landuse, "natural", wetland
|
|
|
|
-- FROM osm_landcover_polygon_gen1
|
|
|
|
-- GROUP BY LabelGrid(geometry, 15000000), landuse, "natural", wetland
|
|
|
|
-- ) AS grouped_measurements
|
|
|
|
--);
|
|
|
|
--CREATE INDEX IF NOT EXISTS landcover_grouped_gen2_geometry_idx ON landcover_grouped_gen2 USING gist(geometry);
|
|
|
|
|
2020-06-08 16:19:55 +00:00
|
|
|
CREATE OR REPLACE FUNCTION landcover_class(subclass varchar) RETURNS text AS
|
Parallel capability to layer functions (#728)
This PR allows queries to be parallelized on recent versions of Postgres. The `PARALLEL SAFE` modifier has been added to the layer functions and a PLPGSQL function to convert strings into number has been replaced.
`PARALLEL SAFE` is a modifier for `CREATE FUNCTION` available since Postgres 9.6, so this change does not break current OpenMapTiles supported database version. More details about this topic [here](https://www.postgresql.org/docs/current/parallel-safety.html) and at the reference documentation for [`CREATE FUNCTION`](https://www.postgresql.org/docs/current/sql-createfunction.html).
### Testing procedure
The procedure to test this was:
* Imported `spain.pbf` in a clean environment
* Dumped the OpenMapTiles database from the Postgres Docker image
* Created a clean Postgres 12 database using the default Docker image
* Installed `postgis` 3 from the default Debian package and `osml10n` 2.5.8 from the repository (`make`, etc.)
* Restored the dump
* Lowered the postgres planner parameters for triggering parallel plans:
```sql
set parallel_setup_cost = 5;
set parallel_tuple_cost = 0.005;
```
* Manually added the `PARALLEL SAFE` modifier to each function involved in layer queries (not on updates or inserting functions).
* For each layer, run a testing query to confirm parallel workers were created, something like this:
```sql
explain analyze
select * from layer_aerodrome_label(tilebbox(8,128,95),10,null)
union all
select * from layer_aerodrome_label(tilebbox(8,128,97),10,null);
```
* After all the layers were processed and confirmed to start parallel executions, a more complete example was run. This example just retrieves the geometries for all the layers from the same tile but without using any MVT related function.
<details><summary>Testing query</summary>
```sql
-- Using the function layer_landuse
explain analyze
select geometry from layer_water(tilebbox(14,8020,6178),14)
union all
select geometry from layer_waterway(tilebbox(14,8020,6178),14)
union all
select geometry from layer_landcover(tilebbox(14,8020,6178),14)
union all
select geometry from layer_landuse(tilebbox(14,8020,6178),14)
union all
select geometry from layer_mountain_peak(tilebbox(14,8020,6178),14)
union all
select geometry from layer_park(tilebbox(14,8020,6178),14)
union all
select geometry from layer_boundary(tilebbox(14,8020,6178),14)
union all
select geometry from layer_aeroway(tilebbox(14,8020,6178),14)
union all
select geometry from layer_transportation(tilebbox(14,8020,6178),14)
union all
select geometry from layer_building(tilebbox(14,8020,6178),14)
union all
select geometry from layer_water_name(tilebbox(14,8020,6178),14)
union all
select geometry from layer_transportation_name(tilebbox(14,8020,6178),14)
union all
select geometry from layer_place(tilebbox(14,8020,6178),14)
union all
select geometry from layer_housenumber(tilebbox(14,8020,6178),14)
union all
select geometry from layer_poi(tilebbox(14,8020,6178),14)
union all
select geometry from layer_aerodrome_label(tilebbox(14,8020,6178),14);
```
</details>
You can inspect the execution plan and results on [this page](https://explain.dalibo.com/plan/3z). Also [attaching](https://github.com/openmaptiles/openmaptiles/files/3951822/explain-tile-simple.tar.gz) the query and JSON output for future reference. The website gives a ton of details, but you may want to search for nodes mentioning `workers` or `parallel` like in this area referring to `osm_border` or `osm_aeroway_linestring` entities
![image](https://user-images.githubusercontent.com/188264/70647153-9cac9300-1c48-11ea-96ea-ac7a1e2f4a79.png)
### Next steps
Since the execution plan is not showing a parallel append at the top level, meaning it's not running each layer individually, I want to continue experimenting with parameters and queries to see if it's possible to even parallelize more the request.
I will post my finding here, even no change in the code should happen.
cc. @nyurik
Co-authored-by: Yuri Astrakhan <yuriastrakhan@gmail.com>
2020-02-01 00:36:02 +00:00
|
|
|
$$
|
2020-06-08 16:19:55 +00:00
|
|
|
SELECT CASE
|
|
|
|
%%FIELD_MAPPING: class %%
|
|
|
|
END;
|
|
|
|
$$ LANGUAGE SQL IMMUTABLE
|
2020-06-17 16:15:26 +00:00
|
|
|
-- STRICT
|
2020-06-08 16:19:55 +00:00
|
|
|
PARALLEL SAFE;
|
2016-10-24 12:27:51 +00:00
|
|
|
|
2020-11-26 12:54:00 +00:00
|
|
|
-- ne_50m_antarctic_ice_shelves_polys
|
|
|
|
-- etldoc: ne_50m_antarctic_ice_shelves_polys -> ne_50m_antarctic_ice_shelves_polys_gen_z4
|
|
|
|
DROP MATERIALIZED VIEW IF EXISTS ne_50m_antarctic_ice_shelves_polys_gen_z4 CASCADE;
|
|
|
|
CREATE MATERIALIZED VIEW ne_50m_antarctic_ice_shelves_polys_gen_z4 AS
|
|
|
|
(
|
|
|
|
SELECT
|
|
|
|
ST_Simplify(geometry, ZRes(6)) as geometry,
|
|
|
|
'ice_shelf'::text AS subclass
|
|
|
|
FROM ne_50m_antarctic_ice_shelves_polys
|
|
|
|
) /* DELAY_MATERIALIZED_VIEW_CREATION */ ;
|
|
|
|
CREATE INDEX IF NOT EXISTS ne_50m_antarctic_ice_shelves_polys_gen_z4_idx ON ne_50m_antarctic_ice_shelves_polys_gen_z4 USING gist (geometry);
|
|
|
|
|
|
|
|
-- ne_110m_glaciated_areas
|
|
|
|
-- etldoc: ne_110m_glaciated_areas -> ne_110m_glaciated_areas_gen_z1
|
|
|
|
DROP MATERIALIZED VIEW IF EXISTS ne_110m_glaciated_areas_gen_z1 CASCADE;
|
|
|
|
CREATE MATERIALIZED VIEW ne_110m_glaciated_areas_gen_z1 AS
|
2020-06-08 16:19:55 +00:00
|
|
|
(
|
2020-11-26 12:54:00 +00:00
|
|
|
SELECT
|
|
|
|
ST_Simplify(geometry, ZRes(3)) as geometry,
|
|
|
|
'glacier'::text AS subclass
|
2020-06-08 16:19:55 +00:00
|
|
|
FROM ne_110m_glaciated_areas
|
2020-11-26 12:54:00 +00:00
|
|
|
) /* DELAY_MATERIALIZED_VIEW_CREATION */ ;
|
|
|
|
CREATE INDEX IF NOT EXISTS ne_110m_glaciated_areas_gen_z1_idx ON ne_110m_glaciated_areas_gen_z1 USING gist (geometry);
|
|
|
|
|
|
|
|
-- etldoc: ne_110m_glaciated_areas_gen_z1 -> ne_110m_glaciated_areas_gen_z0
|
|
|
|
DROP MATERIALIZED VIEW IF EXISTS ne_110m_glaciated_areas_gen_z0 CASCADE;
|
|
|
|
CREATE MATERIALIZED VIEW ne_110m_glaciated_areas_gen_z0 AS
|
|
|
|
(
|
|
|
|
SELECT
|
|
|
|
ST_Simplify(geometry, ZRes(2)) as geometry,
|
|
|
|
subclass
|
|
|
|
FROM ne_110m_glaciated_areas_gen_z1
|
|
|
|
) /* DELAY_MATERIALIZED_VIEW_CREATION */ ;
|
|
|
|
CREATE INDEX IF NOT EXISTS ne_110m_glaciated_areas_gen_z0_idx ON ne_110m_glaciated_areas_gen_z0 USING gist (geometry);
|
|
|
|
|
|
|
|
-- etldoc: ne_50m_antarctic_ice_shelves_polys_gen_z4 -> ne_50m_antarctic_ice_shelves_polys_gen_z3
|
|
|
|
DROP MATERIALIZED VIEW IF EXISTS ne_50m_antarctic_ice_shelves_polys_gen_z3 CASCADE;
|
|
|
|
CREATE MATERIALIZED VIEW ne_50m_antarctic_ice_shelves_polys_gen_z3 AS
|
|
|
|
(
|
|
|
|
SELECT
|
|
|
|
ST_Simplify(geometry, ZRes(5)) as geometry,
|
|
|
|
subclass
|
|
|
|
FROM ne_50m_antarctic_ice_shelves_polys_gen_z4
|
|
|
|
) /* DELAY_MATERIALIZED_VIEW_CREATION */ ;
|
|
|
|
CREATE INDEX IF NOT EXISTS ne_50m_antarctic_ice_shelves_polys_gen_z3_idx ON ne_50m_antarctic_ice_shelves_polys_gen_z3 USING gist (geometry);
|
|
|
|
|
|
|
|
-- etldoc: ne_50m_antarctic_ice_shelves_polys_gen_z3 -> ne_50m_antarctic_ice_shelves_polys_gen_z2
|
|
|
|
DROP MATERIALIZED VIEW IF EXISTS ne_50m_antarctic_ice_shelves_polys_gen_z2 CASCADE;
|
|
|
|
CREATE MATERIALIZED VIEW ne_50m_antarctic_ice_shelves_polys_gen_z2 AS
|
|
|
|
(
|
|
|
|
SELECT
|
|
|
|
ST_Simplify(geometry, ZRes(4)) as geometry,
|
|
|
|
subclass
|
|
|
|
FROM ne_50m_antarctic_ice_shelves_polys_gen_z3
|
|
|
|
) /* DELAY_MATERIALIZED_VIEW_CREATION */ ;
|
|
|
|
CREATE INDEX IF NOT EXISTS ne_50m_antarctic_ice_shelves_polys_gen_z2_idx ON ne_50m_antarctic_ice_shelves_polys_gen_z2 USING gist (geometry);
|
|
|
|
|
|
|
|
-- ne_50m_glaciated_areas
|
|
|
|
-- etldoc: ne_50m_glaciated_areas -> ne_50m_glaciated_areas_gen_z4
|
|
|
|
DROP MATERIALIZED VIEW IF EXISTS ne_50m_glaciated_areas_gen_z4 CASCADE;
|
|
|
|
CREATE MATERIALIZED VIEW ne_50m_glaciated_areas_gen_z4 AS
|
|
|
|
(
|
|
|
|
SELECT
|
|
|
|
ST_Simplify(geometry, ZRes(6)) as geometry,
|
|
|
|
'glacier'::text AS subclass
|
|
|
|
FROM ne_50m_glaciated_areas
|
|
|
|
) /* DELAY_MATERIALIZED_VIEW_CREATION */ ;
|
|
|
|
CREATE INDEX IF NOT EXISTS ne_50m_glaciated_areas_gen_z4_idx ON ne_50m_glaciated_areas_gen_z4 USING gist (geometry);
|
|
|
|
|
|
|
|
-- etldoc: ne_50m_glaciated_areas_gen_z4 -> ne_50m_glaciated_areas_gen_z3
|
|
|
|
DROP MATERIALIZED VIEW IF EXISTS ne_50m_glaciated_areas_gen_z3 CASCADE;
|
|
|
|
CREATE MATERIALIZED VIEW ne_50m_glaciated_areas_gen_z3 AS
|
|
|
|
(
|
|
|
|
SELECT
|
|
|
|
ST_Simplify(geometry, ZRes(5)) as geometry,
|
|
|
|
subclass
|
|
|
|
FROM ne_50m_glaciated_areas_gen_z4
|
|
|
|
) /* DELAY_MATERIALIZED_VIEW_CREATION */ ;
|
|
|
|
CREATE INDEX IF NOT EXISTS ne_50m_glaciated_areas_gen_z3_idx ON ne_50m_glaciated_areas_gen_z3 USING gist (geometry);
|
|
|
|
|
|
|
|
-- etldoc: ne_50m_glaciated_areas_gen_z3 -> ne_50m_glaciated_areas_gen_z2
|
|
|
|
DROP MATERIALIZED VIEW IF EXISTS ne_50m_glaciated_areas_gen_z2 CASCADE;
|
|
|
|
CREATE MATERIALIZED VIEW ne_50m_glaciated_areas_gen_z2 AS
|
|
|
|
(
|
|
|
|
SELECT
|
|
|
|
ST_Simplify(geometry, ZRes(4)) as geometry,
|
|
|
|
subclass
|
|
|
|
FROM ne_50m_glaciated_areas_gen_z3
|
|
|
|
) /* DELAY_MATERIALIZED_VIEW_CREATION */ ;
|
|
|
|
CREATE INDEX IF NOT EXISTS ne_50m_glaciated_areas_gen_z2_idx ON ne_50m_glaciated_areas_gen_z2 USING gist (geometry);
|
|
|
|
|
|
|
|
-- ne_10m_glaciated_areas
|
|
|
|
-- etldoc: ne_10m_glaciated_areas -> ne_10m_glaciated_areas_gen_z6
|
|
|
|
DROP MATERIALIZED VIEW IF EXISTS ne_10m_glaciated_areas_gen_z6 CASCADE;
|
|
|
|
CREATE MATERIALIZED VIEW ne_10m_glaciated_areas_gen_z6 AS
|
|
|
|
(
|
|
|
|
SELECT
|
|
|
|
ST_Simplify(geometry, ZRes(8)) as geometry,
|
|
|
|
'glacier'::text AS subclass
|
|
|
|
FROM ne_10m_glaciated_areas
|
|
|
|
) /* DELAY_MATERIALIZED_VIEW_CREATION */ ;
|
|
|
|
CREATE INDEX IF NOT EXISTS ne_10m_glaciated_areas_gen_z6_idx ON ne_10m_glaciated_areas_gen_z6 USING gist (geometry);
|
|
|
|
|
|
|
|
-- etldoc: ne_10m_glaciated_areas_gen_z6 -> ne_10m_glaciated_areas_gen_z5
|
|
|
|
DROP MATERIALIZED VIEW IF EXISTS ne_10m_glaciated_areas_gen_z5 CASCADE;
|
|
|
|
CREATE MATERIALIZED VIEW ne_10m_glaciated_areas_gen_z5 AS
|
|
|
|
(
|
|
|
|
SELECT
|
|
|
|
ST_Simplify(geometry, ZRes(7)) as geometry,
|
|
|
|
subclass
|
|
|
|
FROM ne_10m_glaciated_areas_gen_z6
|
|
|
|
) /* DELAY_MATERIALIZED_VIEW_CREATION */ ;
|
|
|
|
CREATE INDEX IF NOT EXISTS ne_10m_glaciated_areas_gen_z5_idx ON ne_10m_glaciated_areas_gen_z5 USING gist (geometry);
|
|
|
|
|
|
|
|
-- ne_10m_antarctic_ice_shelves_polys
|
|
|
|
-- etldoc: ne_10m_antarctic_ice_shelves_polys -> ne_10m_antarctic_ice_shelves_polys_gen_z6
|
|
|
|
DROP MATERIALIZED VIEW IF EXISTS ne_10m_antarctic_ice_shelves_polys_gen_z6 CASCADE;
|
|
|
|
CREATE MATERIALIZED VIEW ne_10m_antarctic_ice_shelves_polys_gen_z6 AS
|
|
|
|
(
|
|
|
|
SELECT
|
|
|
|
ST_Simplify(geometry, ZRes(8)) as geometry,
|
|
|
|
'ice_shelf'::text AS subclass
|
|
|
|
FROM ne_10m_antarctic_ice_shelves_polys
|
|
|
|
) /* DELAY_MATERIALIZED_VIEW_CREATION */ ;
|
|
|
|
CREATE INDEX IF NOT EXISTS ne_10m_antarctic_ice_shelves_polys_gen_z6_idx ON ne_10m_antarctic_ice_shelves_polys_gen_z6 USING gist (geometry);
|
|
|
|
|
|
|
|
-- etldoc: ne_10m_antarctic_ice_shelves_polys_gen_z6 -> ne_10m_antarctic_ice_shelves_polys_gen_z5
|
|
|
|
DROP MATERIALIZED VIEW IF EXISTS ne_10m_antarctic_ice_shelves_polys_gen_z5 CASCADE;
|
|
|
|
CREATE MATERIALIZED VIEW ne_10m_antarctic_ice_shelves_polys_gen_z5 AS
|
|
|
|
(
|
|
|
|
SELECT
|
|
|
|
ST_Simplify(geometry, ZRes(7)) as geometry,
|
|
|
|
subclass
|
|
|
|
FROM ne_10m_antarctic_ice_shelves_polys_gen_z6
|
|
|
|
) /* DELAY_MATERIALIZED_VIEW_CREATION */ ;
|
|
|
|
CREATE INDEX IF NOT EXISTS ne_10m_antarctic_ice_shelves_polys_gen_z5_idx ON ne_10m_antarctic_ice_shelves_polys_gen_z5 USING gist (geometry);
|
|
|
|
|
|
|
|
-- etldoc: ne_110m_glaciated_areas_gen_z0 -> landcover_z0
|
|
|
|
CREATE OR REPLACE VIEW landcover_z0 AS
|
|
|
|
(
|
|
|
|
SELECT
|
|
|
|
geometry,
|
|
|
|
subclass
|
|
|
|
FROM ne_110m_glaciated_areas_gen_z0
|
|
|
|
);
|
|
|
|
|
|
|
|
-- etldoc: ne_110m_glaciated_areas_gen_z1 -> landcover_z1
|
|
|
|
CREATE OR REPLACE VIEW landcover_z1 AS
|
|
|
|
(
|
|
|
|
SELECT
|
|
|
|
geometry,
|
|
|
|
subclass
|
|
|
|
FROM ne_110m_glaciated_areas_gen_z1
|
2020-06-08 16:19:55 +00:00
|
|
|
);
|
2016-10-24 07:51:19 +00:00
|
|
|
|
2020-06-08 16:19:55 +00:00
|
|
|
CREATE OR REPLACE VIEW landcover_z2 AS
|
|
|
|
(
|
2020-11-26 12:54:00 +00:00
|
|
|
-- etldoc: ne_50m_glaciated_areas_gen_z2 -> landcover_z2
|
|
|
|
SELECT
|
|
|
|
geometry,
|
|
|
|
subclass
|
|
|
|
FROM ne_50m_glaciated_areas_gen_z2
|
2020-06-08 16:19:55 +00:00
|
|
|
UNION ALL
|
2020-11-26 12:54:00 +00:00
|
|
|
-- etldoc: ne_50m_antarctic_ice_shelves_polys_gen_z2 -> landcover_z2
|
|
|
|
SELECT
|
|
|
|
geometry,
|
|
|
|
subclass
|
|
|
|
FROM ne_50m_antarctic_ice_shelves_polys_gen_z2
|
|
|
|
);
|
|
|
|
|
|
|
|
CREATE OR REPLACE VIEW landcover_z3 AS
|
|
|
|
(
|
|
|
|
-- etldoc: ne_50m_glaciated_areas_gen_z3 -> landcover_z3
|
|
|
|
SELECT
|
|
|
|
geometry,
|
|
|
|
subclass
|
|
|
|
FROM ne_50m_glaciated_areas_gen_z3
|
|
|
|
UNION ALL
|
|
|
|
-- etldoc: ne_50m_antarctic_ice_shelves_polys_gen_z3 -> landcover_z3
|
|
|
|
SELECT
|
|
|
|
geometry,
|
|
|
|
subclass
|
|
|
|
FROM ne_50m_antarctic_ice_shelves_polys_gen_z3
|
|
|
|
);
|
|
|
|
|
|
|
|
CREATE OR REPLACE VIEW landcover_z4 AS
|
|
|
|
(
|
|
|
|
-- etldoc: ne_50m_glaciated_areas_gen_z4 -> landcover_z4
|
|
|
|
SELECT
|
|
|
|
geometry,
|
|
|
|
subclass
|
|
|
|
FROM ne_50m_glaciated_areas_gen_z4
|
|
|
|
UNION ALL
|
|
|
|
-- etldoc: ne_50m_antarctic_ice_shelves_polys_gen_z4 -> landcover_z4
|
|
|
|
SELECT
|
|
|
|
geometry,
|
|
|
|
subclass
|
|
|
|
FROM ne_50m_antarctic_ice_shelves_polys_gen_z4
|
2020-06-08 16:19:55 +00:00
|
|
|
);
|
2016-10-24 07:51:19 +00:00
|
|
|
|
2020-06-08 16:19:55 +00:00
|
|
|
CREATE OR REPLACE VIEW landcover_z5 AS
|
|
|
|
(
|
2020-11-26 12:54:00 +00:00
|
|
|
-- etldoc: ne_10m_glaciated_areas_gen_z5 -> landcover_z5
|
|
|
|
SELECT
|
|
|
|
geometry,
|
|
|
|
subclass
|
|
|
|
FROM ne_10m_glaciated_areas_gen_z5
|
2020-06-08 16:19:55 +00:00
|
|
|
UNION ALL
|
2020-11-26 12:54:00 +00:00
|
|
|
-- etldoc: ne_10m_antarctic_ice_shelves_polys_gen_z5 -> landcover_z5
|
|
|
|
SELECT
|
|
|
|
geometry,
|
|
|
|
subclass
|
|
|
|
FROM ne_10m_antarctic_ice_shelves_polys_gen_z5
|
2020-06-08 16:19:55 +00:00
|
|
|
);
|
2016-10-24 07:51:19 +00:00
|
|
|
|
2020-11-26 12:54:00 +00:00
|
|
|
CREATE OR REPLACE VIEW landcover_z6 AS
|
|
|
|
(
|
|
|
|
-- etldoc: ne_10m_glaciated_areas_gen_z6 -> landcover_z6
|
|
|
|
SELECT
|
|
|
|
geometry,
|
|
|
|
subclass
|
|
|
|
FROM ne_10m_glaciated_areas_gen_z6
|
|
|
|
UNION ALL
|
|
|
|
-- etldoc: ne_10m_antarctic_ice_shelves_polys_gen_z6 -> landcover_z6
|
|
|
|
SELECT
|
|
|
|
geometry,
|
|
|
|
subclass
|
|
|
|
FROM ne_10m_antarctic_ice_shelves_polys_gen_z6
|
|
|
|
);
|
|
|
|
|
|
|
|
-- etldoc: layer_landcover[shape=record fillcolor=lightpink, style="rounded, filled", label="layer_landcover | <z0> z0 | <z1> z1 | <z2> z2 | <z3> z3 | <z4> z4 | <z5> z5 | <z6> z6 |<z7> z7 |<z8> z8 |<z9> z9 |<z10> z10 |<z11> z11 |<z12> z12|<z13> z13|<z14_> z14+" ] ;
|
2016-11-10 00:45:17 +00:00
|
|
|
|
2016-10-10 18:37:23 +00:00
|
|
|
CREATE OR REPLACE FUNCTION layer_landcover(bbox geometry, zoom_level int)
|
2020-06-08 16:19:55 +00:00
|
|
|
RETURNS TABLE
|
|
|
|
(
|
|
|
|
geometry geometry,
|
|
|
|
class text,
|
|
|
|
subclass text
|
|
|
|
)
|
|
|
|
AS
|
Parallel capability to layer functions (#728)
This PR allows queries to be parallelized on recent versions of Postgres. The `PARALLEL SAFE` modifier has been added to the layer functions and a PLPGSQL function to convert strings into number has been replaced.
`PARALLEL SAFE` is a modifier for `CREATE FUNCTION` available since Postgres 9.6, so this change does not break current OpenMapTiles supported database version. More details about this topic [here](https://www.postgresql.org/docs/current/parallel-safety.html) and at the reference documentation for [`CREATE FUNCTION`](https://www.postgresql.org/docs/current/sql-createfunction.html).
### Testing procedure
The procedure to test this was:
* Imported `spain.pbf` in a clean environment
* Dumped the OpenMapTiles database from the Postgres Docker image
* Created a clean Postgres 12 database using the default Docker image
* Installed `postgis` 3 from the default Debian package and `osml10n` 2.5.8 from the repository (`make`, etc.)
* Restored the dump
* Lowered the postgres planner parameters for triggering parallel plans:
```sql
set parallel_setup_cost = 5;
set parallel_tuple_cost = 0.005;
```
* Manually added the `PARALLEL SAFE` modifier to each function involved in layer queries (not on updates or inserting functions).
* For each layer, run a testing query to confirm parallel workers were created, something like this:
```sql
explain analyze
select * from layer_aerodrome_label(tilebbox(8,128,95),10,null)
union all
select * from layer_aerodrome_label(tilebbox(8,128,97),10,null);
```
* After all the layers were processed and confirmed to start parallel executions, a more complete example was run. This example just retrieves the geometries for all the layers from the same tile but without using any MVT related function.
<details><summary>Testing query</summary>
```sql
-- Using the function layer_landuse
explain analyze
select geometry from layer_water(tilebbox(14,8020,6178),14)
union all
select geometry from layer_waterway(tilebbox(14,8020,6178),14)
union all
select geometry from layer_landcover(tilebbox(14,8020,6178),14)
union all
select geometry from layer_landuse(tilebbox(14,8020,6178),14)
union all
select geometry from layer_mountain_peak(tilebbox(14,8020,6178),14)
union all
select geometry from layer_park(tilebbox(14,8020,6178),14)
union all
select geometry from layer_boundary(tilebbox(14,8020,6178),14)
union all
select geometry from layer_aeroway(tilebbox(14,8020,6178),14)
union all
select geometry from layer_transportation(tilebbox(14,8020,6178),14)
union all
select geometry from layer_building(tilebbox(14,8020,6178),14)
union all
select geometry from layer_water_name(tilebbox(14,8020,6178),14)
union all
select geometry from layer_transportation_name(tilebbox(14,8020,6178),14)
union all
select geometry from layer_place(tilebbox(14,8020,6178),14)
union all
select geometry from layer_housenumber(tilebbox(14,8020,6178),14)
union all
select geometry from layer_poi(tilebbox(14,8020,6178),14)
union all
select geometry from layer_aerodrome_label(tilebbox(14,8020,6178),14);
```
</details>
You can inspect the execution plan and results on [this page](https://explain.dalibo.com/plan/3z). Also [attaching](https://github.com/openmaptiles/openmaptiles/files/3951822/explain-tile-simple.tar.gz) the query and JSON output for future reference. The website gives a ton of details, but you may want to search for nodes mentioning `workers` or `parallel` like in this area referring to `osm_border` or `osm_aeroway_linestring` entities
![image](https://user-images.githubusercontent.com/188264/70647153-9cac9300-1c48-11ea-96ea-ac7a1e2f4a79.png)
### Next steps
Since the execution plan is not showing a parallel append at the top level, meaning it's not running each layer individually, I want to continue experimenting with parameters and queries to see if it's possible to even parallelize more the request.
I will post my finding here, even no change in the code should happen.
cc. @nyurik
Co-authored-by: Yuri Astrakhan <yuriastrakhan@gmail.com>
2020-02-01 00:36:02 +00:00
|
|
|
$$
|
2020-11-11 13:11:48 +00:00
|
|
|
SELECT geometry,
|
2020-06-08 16:19:55 +00:00
|
|
|
landcover_class(subclass) AS class,
|
|
|
|
subclass
|
|
|
|
FROM (
|
2020-11-26 12:54:00 +00:00
|
|
|
-- etldoc: landcover_z0 -> layer_landcover:z0
|
2020-11-11 13:11:48 +00:00
|
|
|
SELECT geometry,
|
|
|
|
subclass
|
2020-06-08 16:19:55 +00:00
|
|
|
FROM landcover_z0
|
2020-11-26 12:54:00 +00:00
|
|
|
WHERE zoom_level = 0
|
|
|
|
AND geometry && bbox
|
|
|
|
UNION ALL
|
|
|
|
-- etldoc: landcover_z1 -> layer_landcover:z1
|
|
|
|
SELECT geometry,
|
|
|
|
subclass
|
|
|
|
FROM landcover_z1
|
|
|
|
WHERE zoom_level = 1
|
2020-06-08 16:19:55 +00:00
|
|
|
AND geometry && bbox
|
|
|
|
UNION ALL
|
2020-11-26 12:54:00 +00:00
|
|
|
-- etldoc: landcover_z2 -> layer_landcover:z2
|
2020-11-11 13:11:48 +00:00
|
|
|
SELECT geometry,
|
|
|
|
subclass
|
2020-06-08 16:19:55 +00:00
|
|
|
FROM landcover_z2
|
2020-11-26 12:54:00 +00:00
|
|
|
WHERE zoom_level = 2
|
|
|
|
AND geometry && bbox
|
|
|
|
UNION ALL
|
|
|
|
-- etldoc: landcover_z3 -> layer_landcover:z3
|
|
|
|
SELECT geometry,
|
|
|
|
subclass
|
|
|
|
FROM landcover_z3
|
|
|
|
WHERE zoom_level = 3
|
2020-06-08 16:19:55 +00:00
|
|
|
AND geometry && bbox
|
|
|
|
UNION ALL
|
2020-11-26 12:54:00 +00:00
|
|
|
-- etldoc: landcover_z4 -> layer_landcover:z4
|
|
|
|
SELECT geometry,
|
|
|
|
subclass
|
|
|
|
FROM landcover_z4
|
|
|
|
WHERE zoom_level = 4
|
|
|
|
AND geometry && bbox
|
|
|
|
UNION ALL
|
|
|
|
-- etldoc: landcover_z5 -> layer_landcover:z5
|
2020-11-11 13:11:48 +00:00
|
|
|
SELECT geometry,
|
|
|
|
subclass
|
2020-06-08 16:19:55 +00:00
|
|
|
FROM landcover_z5
|
2020-11-26 12:54:00 +00:00
|
|
|
WHERE zoom_level = 5
|
|
|
|
AND geometry && bbox
|
|
|
|
UNION ALL
|
|
|
|
-- etldoc: landcover_z6 -> layer_landcover:z6
|
|
|
|
SELECT geometry,
|
|
|
|
subclass
|
|
|
|
FROM landcover_z6
|
|
|
|
WHERE zoom_level = 6
|
2020-06-08 16:19:55 +00:00
|
|
|
AND geometry && bbox
|
|
|
|
UNION ALL
|
2020-11-11 13:11:48 +00:00
|
|
|
-- etldoc: osm_landcover_gen_z7 -> layer_landcover:z7
|
|
|
|
SELECT geometry,
|
|
|
|
subclass
|
|
|
|
FROM osm_landcover_gen_z7
|
2020-06-08 16:19:55 +00:00
|
|
|
WHERE zoom_level = 7
|
|
|
|
AND geometry && bbox
|
|
|
|
UNION ALL
|
2020-11-11 13:11:48 +00:00
|
|
|
-- etldoc: osm_landcover_gen_z8 -> layer_landcover:z8
|
|
|
|
SELECT geometry,
|
|
|
|
subclass
|
|
|
|
FROM osm_landcover_gen_z8
|
2020-06-08 16:19:55 +00:00
|
|
|
WHERE zoom_level = 8
|
|
|
|
AND geometry && bbox
|
|
|
|
UNION ALL
|
2020-11-11 13:11:48 +00:00
|
|
|
-- etldoc: osm_landcover_gen_z9 -> layer_landcover:z9
|
|
|
|
SELECT geometry,
|
|
|
|
subclass
|
|
|
|
FROM osm_landcover_gen_z9
|
2020-06-08 16:19:55 +00:00
|
|
|
WHERE zoom_level = 9
|
|
|
|
AND geometry && bbox
|
|
|
|
UNION ALL
|
2020-11-11 13:11:48 +00:00
|
|
|
-- etldoc: osm_landcover_gen_z10 -> layer_landcover:z10
|
|
|
|
SELECT geometry,
|
|
|
|
subclass
|
|
|
|
FROM osm_landcover_gen_z10
|
2020-06-08 16:19:55 +00:00
|
|
|
WHERE zoom_level = 10
|
|
|
|
AND geometry && bbox
|
|
|
|
UNION ALL
|
2020-11-11 13:11:48 +00:00
|
|
|
-- etldoc: osm_landcover_gen_z11 -> layer_landcover:z11
|
|
|
|
SELECT geometry,
|
|
|
|
subclass
|
|
|
|
FROM osm_landcover_gen_z11
|
2020-06-08 16:19:55 +00:00
|
|
|
WHERE zoom_level = 11
|
|
|
|
AND geometry && bbox
|
|
|
|
UNION ALL
|
2020-11-11 13:11:48 +00:00
|
|
|
-- etldoc: osm_landcover_gen_z12 -> layer_landcover:z12
|
|
|
|
SELECT geometry,
|
|
|
|
subclass
|
|
|
|
FROM osm_landcover_gen_z12
|
2020-06-08 16:19:55 +00:00
|
|
|
WHERE zoom_level = 12
|
|
|
|
AND geometry && bbox
|
|
|
|
UNION ALL
|
2020-11-11 13:11:48 +00:00
|
|
|
-- etldoc: osm_landcover_gen_z13 -> layer_landcover:z13
|
|
|
|
SELECT geometry,
|
|
|
|
subclass
|
|
|
|
FROM osm_landcover_gen_z13
|
2020-06-08 16:19:55 +00:00
|
|
|
WHERE zoom_level = 13
|
|
|
|
AND geometry && bbox
|
|
|
|
UNION ALL
|
2020-11-11 13:11:48 +00:00
|
|
|
-- etldoc: osm_landcover_polygon -> layer_landcover:z14_
|
|
|
|
SELECT geometry,
|
|
|
|
subclass
|
|
|
|
FROM osm_landcover_polygon
|
2020-06-08 16:19:55 +00:00
|
|
|
WHERE zoom_level >= 14
|
|
|
|
AND geometry && bbox
|
|
|
|
) AS zoom_levels;
|
2020-06-17 16:15:26 +00:00
|
|
|
$$ LANGUAGE SQL STABLE
|
|
|
|
-- STRICT
|
2020-11-26 12:54:00 +00:00
|
|
|
PARALLEL SAFE;
|