[postgis-tickets] [PostGIS] #3524: Getting distance between united States and Russia in geography hangs up the server

[PostGIS]

#3524: Getting distance between united States and Russia in geography hangs up the
server
----------------------+---------------------------
  Reporter:  robe     |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  high     |  Milestone:  PostGIS 2.1.9
 Component:  postgis  |    Version:  2.2.x
Resolution:           |   Keywords:
----------------------+---------------------------
Description changed by robe:

Old description:

> My server seems pretty frozen computing these and it's still trying to
> compute the distance between these two countries and it's been 15 minutes
> already.
>
> After about 17 minutes or waiting I decided to just cancel the query and
> the query would not cancel even after 7 minutes of waiting.  Then I tried
> to pg_terminate_backend it, and that still did not work.  So I had to
> finally end up killing my service entirely.
>
> I know they are big but really?  I should at least be able to cancel.
>
> We were testing on 2.2.1, but decided to also test on 2.1.8 (postgresql
> 9.4).  Same issue on both.
>
> Us has 36054 points and Russia has 36352
>
> Query is as follows:
>

>

> {{{
> SELECT ST_Distance(a.geog, b.geog)
> FROM   (SELECT geom::geography As geog, ST_NPoints(geom) As npoints FROM
> ur_test WHERE name = 'United States') AS a
> ,  (SELECT geom::geography AS geog, ST_NPoints(geom) As npoints FROM
> ur_test WHERE name = 'Russia') AS b
> }}}
>

>
> Casting to geography is quick.  Doing distance on geometry I think was
> about 2 seconds.

New description:

 My server seems pretty frozen computing these and it's still trying to
 compute the distance between these two countries and it's been 15 minutes
 already.

 After about 17 minutes of waiting I decided to just cancel the query and
 the query would not cancel even after 7 minutes of waiting.  Then I tried
 to pg_terminate_backend it, and that still did not work.  So I had to
 finally end up killing my service entirely.

 I know they are big but really?  I should at least be able to cancel.

 We were testing on 2.2.1, but decided to also test on 2.1.8 (postgresql
 9.4).  Same issue on both.

 Us has 36054 points and Russia has 36352

 Query is as follows:




 {{{
 SELECT ST_Distance(a.geog, b.geog)
 FROM   (SELECT geom::geography As geog, ST_NPoints(geom) As npoints FROM
 ur_test WHERE name = 'United States') AS a
 ,  (SELECT geom::geography AS geog, ST_NPoints(geom) As npoints FROM
 ur_test WHERE name = 'Russia') AS b
 }}}



 Casting to geography is quick.  Doing distance on geometry I think was
 about 2 seconds.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3524#comment:1>
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