omniscale / imposm3

Imposm imports OpenStreetMap data into PostGIS
http://imposm.org/docs/imposm3/latest/
Apache License 2.0
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Way duplication #185

Open zdila opened 5 years ago

zdila commented 5 years ago

Sometimes when minutely diff is applied the way is duplicated. I saw it twice so far - only end node of the way was moved and 2nd row for this way was created even that version of the way in OSM didn't change. I observed it in osm_roads table: https://github.com/FreemapSlovakia/freemap-mapnik/blob/b8ccd031dcb43091102747fc9742be948a69d8a0/mapping.yaml

Rows in that case were equal except for id and geometry column.

Unfortunately I can't reliably reproduce it.

Your Environment

zdila commented 5 years ago

I see that problem now reguralry on the map. Is it a knwon problem?

olt commented 5 years ago

You need to provide more details. Planet or extracts? How do you import diffs? Limitto? Which elements are duplicate (all columns including the OSM ID)?

zdila commented 5 years ago

@olt, full process is described at https://github.com/FreemapSlovakia/freemap-mapnik/blob/fe8686aef2072dd6ba6eb05c3444cd8c5909603e/doc/INSTALL.md#setting-up-minutely-diff-applying-working-notes

limit.geojson

I'll check which elements are duplicated in the evening and will update it here.

zdila commented 5 years ago

Initial import was done cca 2 months ago and since then minutely diffs are being applied. Some stats on roads table:

martin=> select count(1) from osm_roads a join osm_roads b on (a.id <> b.id and a.osm_id = b.osm_id and a.type = b.type);
 count 
-------
   164
(1 row)

Duplicates differ only in id and geometry column. I've tried for every other column:

martin=> select a.osm_id from osm_roads a join osm_roads b on (a.id <> b.id and a.osm_id = b.osm_id and a.type = b.type) where a.COLUMN <> b.COLUMN
 osm_id 
--------
(0 rows)

...and all returned 0.

Also there are no duplicates having equal geometry:

martin=> select a.osm_id from osm_roads a join osm_roads b on (a.id <> b.id and a.osm_id = b.osm_id and a.type = b.type) where st_equals(a.geometry, b.geometry);
 osm_id 
--------
(0 rows)

We use Postgres 11.1. Also:

martin=> SELECT PostGIS_full_version();
NOTICE:  Topology support cannot be inspected. Is current user granted USAGE on schema "topology" ?
                                                                                                                                                                       postgis_full_version                                              

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------------------------------------
 POSTGIS="2.5.1 r17027" [EXTENSION] PGSQL="100" (procs need upgrade for use with "110") GEOS="3.7.1-CAPI-1.11.1 27a5e771" PROJ="Rel. 5.2.0, September 15th, 2018" GDAL="GDAL 2.3.2, released 2018/09/21" LIBXML="2.9.8" LIBJSON="0.13.1" 
LIBPROTOBUF="1.3.1" (core procs from "2.5.0 r16836" need upgrade) RASTER (raster procs from "2.5.0 r16836" need upgrade)
(1 row)

@olt is it sufficient or do you need some more info?

ImreSamu commented 5 years ago

Hi @zdila ,

imho: it is at least "a weekend project" to analyze your issue. ( setup your system , loading europe-latest.osm.pbf, replay 2-month osm data. ) + cost of the cloud server price.

Can you create a minimal setup (minimal input data + minimal mapping) for reproducing a problem?

for example:

so anybody with a simple laptop ( with minimal disk space ) - can replay and reproduce the problems.

  • Version used: latest

this is the latest binary? ( v0.6.0-alpha.4 )
or the latest master ?

osm_roads table: .... count: 164

Can you export and share the 164 osm_ids and the geometry data ( gist? SELECT format ; PG Dump format )

Duplicates differ only in id and geometry column.

Can you analyze the geometry differences? ( https://postgis.net/docs/ST_Difference.html ? )

zdila commented 5 years ago

I will try to prepare testcase once I'll be little less bussy. Till then maybe you can use my answers:

this is the latest binary?

It was the latest master

Can you export and share the 164 osm_ids and the geometry data Can you analyze the geometry differences?

Meanwhile I've reimported the data. Geometries and their differences since then:

martin=> select a.id, st_astext(a.geometry), st_astext(b.geometry), st_astext(ST_Difference(a.geometry, b.geometry)) from osm_roads a join osm_roads b on (a.id <> b.id and a.osm_id = b.osm_id and a.type = b.type);;
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(46 rows)
zdila commented 5 years ago

Also, just for the illustration: This area was recently modified and it is rendered incorrectly. Each color strip represents a hiking relation and both strips should go along all the segments. Now only segment on the top is correct (https://www.openstreetmap.org/way/346949988) others are not (eg. https://www.openstreetmap.org/way/346950021).

image

EDIT: The problem with marked hiking trail relates to https://github.com/omniscale/imposm3/issues/185#issuecomment-487732954 and thus is offtopic for this issue.

ImreSamu commented 5 years ago

@zdila :

:smile: Ouch, the osm_id is still missing from your select ....

martin=> select a.id, st_astext(a.geometry), st_astext(b.geometry), st_astext(ST_Difference(a.geometry, b.geometry)) from osm_roads a join osm_roads b on (a.id <> b.id and a.osm_id = b.osm_id and a.type = b.type);;

Please add "a.osm_id" , "b.id" and the "order by" .... ( not tested )

       select 
                         a.osm_id      ---  <- please add this info
                       , a.id
                       , b.id               --  <- maybe this is useful.
                       , st_astext(a.geometry)
                       , st_astext(b.geometry)
                       , st_astext(ST_Difference(a.geometry, b.geometry)) 
               from osm_roads a join osm_roads b on (a.id <> b.id and a.osm_id = b.osm_id and a.type = b.type)
      order by 1,2,3    --    <-- please  add some ordering.
     ;

If you can create some monitoring tool ; ( for example checking and reporting - the duplicated records - every hour - or every 10minutes ) - it would be helpful.

zdila commented 5 years ago

Oops, sorry. The result is:

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-----------+---------+---------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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(46 rows)

I'll also create that script you ask...

ImreSamu commented 5 years ago

@zdila :

As I see - some nodes ( and some related realations/ways ) is changed in this cases ..

from your example:

398051367 |  957841 | 1301550 | LINESTRING(2163331.51938453 6401553.04977376,2163383.56598413 6401447.15947884)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | LINESTRING(2163331.51938453 6401553.04977376,2163383.84123656 6401449.02799872)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | LINESTRING(2163331.51938453 6401553.04977376,2163383.56598413 6401447.15947884)
398051367 | 1301550 |  957841 | LINESTRING(2163331.51938453 6401553.04977376,2163383.84123656 6401449.02799872)

so maybe from the 3ways history ( w398051367, w313940866, w398030547) - you can create a minimal example.

zdila commented 5 years ago

If you can create some monitoring tool

I've already set it up but so far (since sunday) no new duplicate appeared. Let us wait some more time.

zdila commented 5 years ago

Unfortunately I found no time to create a testcase and I can't tell when I will be able to do it. At least I have the logs from that monitoring tool if you are interested.

zdila commented 5 years ago

I've created a script which can find osmc causing the problem:

#!/bin/bash

while echo 'select count(1) from osm_roads a join osm_roads b on (a.id <> b.id and a.osm_id = b.osm_id and a.type = b.type);' | psql -qtAX | grep -q '^0$'; do
        IMPOSM3_SINGLE_DIFF=1 ~/go/bin/imposm run -connection postgis://martin:***@localhost/martin -mapping mapping.yaml -limitto limit.geojson -cachedir ./cache -diffdir ./diff -expiretiles-zoom 15 -expiretiles-dir ./expires
done

echo 'select a.osm_id, b.osm_id, a.id, st_astext(ST_Difference(a.geometry, b.geometry)) from osm_roads a join osm_roads b on (a.id <> b.id and a.osm_id = b.osm_id and a.type = b.type);' | psql

I've imported http://download.geofabrik.de/europe/slovakia-140101.osm.pbf, set last state to https://planet.openstreetmap.org/replication/minute/002/959/939.state.txt and ran the script. It terminated after applying https://planet.openstreetmap.org/replication/minute/002/963/959.osc.gz which duplicates way 244548972.

Log from last imposm3 run:

[2019-04-13T19:19:59+02:00] 0:00:00 [step] Starting: Reading limitto geometries
[2019-04-13T19:19:59+02:00] 0:00:00 [step] Finished: Reading limitto geometries in 12.626875ms
[2019-04-13T19:19:59+02:00] 0:00:00 [info] Starting replication from https://planet.openstreetmap.org/replication/minute/ with 1m0s interval
[2019-04-13T19:19:59+02:00] 0:00:00 [info] Importing #2963959 including changes till 2018-05-10 05:57:02 +0000 UTC (8123h22m57s behind)
[2019-04-13T19:19:59+02:00] 0:00:00 [step] Starting: Importing #2963959
[2019-04-13T19:19:59+02:00] 0:00:00 [step] Starting: Processing diff/002/963/959.osc.gz
[2019-04-13T19:19:59+02:00] 0:00:00 [step] Starting: Parsing changes, updating cache and removing elements
[2019-04-13T19:19:59+02:00] 0:00:00 [step] Finished: Parsing changes, updating cache and removing elements in 71.205142ms
[2019-04-13T19:19:59+02:00] 0:00:00 [step] Starting: Importing added/modified elements
[2019-04-13T19:19:59+02:00] 0:00:00 [progress]     0s C:       0/s (1326) N:       0/s (2) W:       0/s (303) R:      0/s (12)
[2019-04-13T19:19:59+02:00] 0:00:00 [step] Starting: Updating generalized tables
[2019-04-13T19:19:59+02:00] 0:00:00 [step] Finished: Updating generalized tables in 4.447396ms
[2019-04-13T19:19:59+02:00] 0:00:00 [step] Finished: Importing added/modified elements in 86.213831ms
[2019-04-13T19:19:59+02:00] 0:00:00 [progress]     0s C:       0/s (0) N:       0/s (4) W:       0/s (246) R:      0/s (8)
[2019-04-13T19:19:59+02:00] 0:00:00 [step] Finished: Processing diff/002/963/959.osc.gz in 176.989569ms
[2019-04-13T19:19:59+02:00] 0:00:00 [step] Finished: Importing #2963959 in 178.078869ms

Mapping file: https://github.com/FreemapSlovakia/freemap-mapnik/blob/58fce54be0778264f63ee10ae9b9e0c7a65516d6/mapping.yaml

Limit file: https://github.com/FreemapSlovakia/freemap-mapnik/blob/58fce54be0778264f63ee10ae9b9e0c7a65516d6/limit.geojson

Is it sufficient for you to replicate it?

zdila commented 5 years ago

Could be related or not, after modifying relation in OSM it's member has now slightly different geometry in comparison to the same member of other relation:

martin=> select osm_id, member, role, type, st_astext(geometry) from osm_route_members where member = 686673945;
  osm_id  |  member   | role | type |                                                                                      st_astext                                                                                       
----------+-----------+------+------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  -192031 | 686673945 |      |    1 | LINESTRING(2028148.93054565 6260759.39576692,2028103.1914938 6260752.14026574,2027988.87185626 6260744.51560681,2027954.80550002 6260735.35750602,2027931.5316176 6260735.93001159)
  -541000 | 686673945 |      |    1 | LINESTRING(2028148.93054565 6260759.39576692,2028103.1914938 6260752.14026574,2027988.87185626 6260744.51560681,2027954.80550002 6260735.35750602,2027931.5316176 6260735.93001159)
 -9526458 | 686673945 |      |    1 | LINESTRING(2028148.93054565 6260759.39576692,2028103.1914938 6260752.14026574,2027988.87185626 6260744.51560681,2027954.80550002 6260735.35750602,2027931.52542365 6260735.92544996)
(3 rows)

This happened in changeset 69702171 (after applying minutely diff):

timestamp=2019-04-29T15\:57\:02Z
sequenceNumber=3473014
olt commented 5 years ago

I tried to reproduce this with the Slovakia extract and your mapping, but I was unable to reproduce this with an import beginning with 2/963/930.osc.gz. Importing all 6000 changesets might reproduce this error, but this won't help much in fixing the issue.

I can acknowledge the issue, as I also found duplicates in another database. However, I don't really understand how this happens and why it only happens "randomly".

The duplicate ways all seem to have in common, that they are old and a new changeset only changes a single node. This should trigger a delete of all depending ways and these ways are thenre-imported with the updated node. This is a common case and there are tests for this. But somehow, some ways are not deleted but they are re-imported.

I just merged a larger refactoring of the parser and also found that errors were not returned immediately in Delete (however the transaction aborts and the Commit should fail later). Time will have to tell if this fixes the issue.

Could be related or not, after modifying relation in OSM it's member has now slightly different geometry in comparison to the same member of other relation

No, not related. Nodes lose precision when they are serialized in the internal cache (same precision as in the PBF). While building the member geometries, one node of the way was still in the in-memory cache with the full precision.

zdila commented 5 years ago

Merge did not fix it. After fresh import (on fresh server) and 2 days of minutely diffs I see one road to be duplicated. But still thanks for the effort.

olt commented 5 years ago

Did you use the release binaries or did build from master? I just realized that I only pushed the tag v0.7.2, but that didn't update master. Master is now up to date and there is also v0.7.3 with a fix for imposm run.

zdila commented 5 years ago

So far I was always building from master.