"Precondition violation" not fixable from within JOSM

[Geimas5]

Recently, I have occasionally started to receive errors while uploading data with no apparent way of solving the error without starting over.

What happens:
I receive this error when attempting to upload:

Uploading to the server failed because your current dataset violates a precondition. The error message is: ResponseCode=412, Error Header=<Precondition failed: Relation 10810290 requires the ways with id in 779691669, which either do not exist, or are not visible.>

It does not help to download the area again to the same layer, and the only way I have found to fix the problem it to discard all changes by deleting the data layer and start over.

[Geimas5]

Datafile with the described problem

[Don-vip]

Please attach your status report and describe how you create the data you want to upload.

[Geimas5]

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2020-02-26 10:50:27 +0100 (Wed, 26 Feb 2020)
Build-Date:2020-02-26 09:52:41
Revision:15937
Relative:URL: ^/trunk

Identification: JOSM/1.5 (15937 en) Windows 10 64-Bit
OS Build number: Windows 10 Enterprise 1909 (18363)
Memory Usage: 247 MB / 989 MB (108 MB allocated, but free)
Java version: 1.8.0_241-b07, Oracle Corporation, Java HotSpot(TM) Client VM
Screen: \Display0 1920x1080
Maximum Screen Size: 1920x1080

Plugins:
+ buildings_tools (35248)
+ conflation (0.6.4)
+ jaxb (35092)
+ jts (35122)
+ kartverketimport (35)
+ log4j (35092)
+ todo (30306)
+ turnrestrictions (35313)
+ utilsplugin2 (35334)

Map paint styles:
+ https://josm.openstreetmap.de/josmfile?page=Styles/Coloured_buildings&zip=1

Last errors/warnings:
- W: Cannot lock cache directory. Will not use disk cache
- W: Cannot start IPv4 remotecontrol server on port 8111: Address already in use: JVM_Bind
- W: Cannot start IPv6 remotecontrol server on port 8111: Address already in use: JVM_Bind

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cache.capabilities1637351842=1583965856
cache.motd.html=1583965856
cache.motd.html.java=1.8.0_241
cache.motd.html.lang=En:
cache.motd.html.version=15937
changesetdialog.lastHeight=0
commandstack.lastHeight=0
conflation.png.lastHeight=0
conflict.lastHeight=0
conflict.visible=true
coordinates=DECIMAL_DEGREES
download.overpass.servers=[http://overpass.openstreetmap.ru/cgi/, https://overpass-api.de/api/]
download.overpass.wizard=[building=hangar]
draw.rawgps.colormode=0
draw.rawgps.lines=2
expert=true
filter.lastHeight=0
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[Geimas5]

In terms of creating the data, I have no idea what causes this, as it happens very rarely and with very different things that I have been doing. Since it also happens most of the time after I have worked for hours on a specific area, its hard to describe exactly what I have been doing.

However, it almost always involve relations and when I have been downloading data using the overpass API.

I don't know if its actually a cause, but it often happens when I have more than 10000 changes pending and uploading requires multiple changesets, in which it fails on the last changeset (and causes a large amount of extra work to clean up all of the orphan nodes which was created successfully in the osm database).

[skyper]

Did you try "update data" ? You can even do it now.

If I do so, now. I get 2168 conflicts (2153 nodes, 13 ways, 2 relations)

Before such a big upload, please, save to file, update data (or at least modified) and then upload. Maybe, you can even manually select small chunks of the modified including some relations and use upload selection without closing the changeset.

Problem, here is a deleted way (​779691669) which is listed in the conflicts like the relation it was part of.

I wonder why JOSM did not ask to look on the server for deleted objects, though. Anyway, the upload would have been interrupted to solve the conflicts.

I had a similar situation the last days, though, it was the result of user's fault. I merged a way which was deleted meanwhile from an outdated layer/file. I had to manually undelete/revert the way first but that is a different story.

[Geimas5]

Replying to skyper:

Did you try "update data" ? You can even do it now.

I did not try the "update data"; however, I did try to update the data using the "Download data" without that detecting any issues at the time.

If I do so, now. I get 2168 conflicts (2153 nodes, 13 ways, 2 relations)

I have since redone everything, so that is to be expected.

Before such a big upload, please, save to file, update data (or at least modified) and then upload. Maybe, you can even manually select small chunks of the modified including some relations and use upload selection without closing the changeset.

Problem, here is a deleted way (​779691669) which is listed in the conflicts like the relation it was part of.

I wonder why JOSM did not ask to look on the server for deleted objects, though. Anyway, the upload would have be interrupted to solve the conflicts.

While I can be wrong, I seem to remember that, in the past, when I used the "Download data" function to redownload the data for a region, the conflicts were detected. It's only in the past two weeks that I have started to see these raw API errors occasionally.

I have also, lately, started to receive messages about the local version of an object being, for example, 5, while the one on the server being version 6 as this raw API error that JOSM does not seem to be able to understand. I have a vague memory that this used to be handled as a conflict by JOSM. To me, it seems as if something has changed lately.

However, I think I know what caused those version conflicts. It happened when I first downloaded a selection of data using an overpass query, when I then want to edit an area, I download all the data for that area using the "Download data" method. I believe the data from the overpass query can be a few minutes behind the main DB. What's weird then is that JOSM does not detect that it has received newer data from the server from the "Download data" option.

I had a similar situation the last days, though, it was the result of user's fault. I merged a way which was deleted meanwhile from an outdated layer/file. I had to manually undelete/revert the way first but that is a different story.

[skyper]

Please have a look at your connection settings in preferences and tell us, if the option "Use overpass server to download objects is enabled in the tab "Overpass server".

[Geimas5]

Replying to skyper:

Please have a look at your connection settings in preferences and tell us, if the option "Use overpass server to download objects is enabled in the tab "Overpass server".

That checkbox is unchecked.

[GerdP]

#19124 might be related

[GerdP]

I see that way 779691669 was deleted in CS ​https://www.openstreetmap.org/changeset/82080678 on the same day (2020-03-11T21:57:23Z"), so it is likely that is was deleted after you downloaded the relation 10810290.
Your file contains 6 download areas, so maybe you did not update the one which contains the relation?

[Geimas5]

Replying to GerdP:

I see that way 779691669 was deleted in CS ​https://www.openstreetmap.org/changeset/82080678 on the same day (2020-03-11T21:57:23Z"), so it is likely that is was deleted after you downloaded the relation 10810290.
Your file contains 6 download areas, so maybe you did not update the one which contains the relation?

While it is so long ago now that it is a little hard for me to remember the details, I am pretty sure I was very careful to download everything. During that editing process, the bounds I am working within is very well defined. I also often take a screenshot to make sure I download everything. Even so, I always download a much larger area than I need. Due to the download limit, I often need to download 6-7 or more overlapping areas to get everything.

In terms of the database change log. I redid everything the same day. Therefore, I am not sure how much use the change sets are, as I do not remember the exact time this happened.

[GerdP]

I am not sure what you expect to happen. The file output_part18.osm contains the relation in version 3 with the status modified. The server obviously had version 3 or higher which didn't contain way 779691669, so I think it is correct that you got a conflict. The conflict will not disappear when you download the data again, you have to tell JOSM how to resolve the conflict using the conflict manager. Did you try that?

[Geimas5]

Replying to GerdP:

I am not sure what you expect to happen. The file output_part18.osm contains the relation in version 3 with the status modified. The server obviously had version 3 or higher which didn't contain way 779691669, so I think it is correct that you got a conflict. The conflict will not disappear when you download the data again, you have to tell JOSM how to resolve the conflict using the conflict manager. Did you try that?

My problem was that JSOM did not detect this as a conflict when downloading the data which could be handled by the conflict manager. That is indeed what usually happens, but not this time. Usually, I get a popup with a message saying something like "3 conflicts detected...".

What happened this time, was a error which just showed the generic response from the API, but with no way for me to correct the problem without starting over.

I would guess the API response parsing routines JSOM have just failed for some reason this time. But I don't know enough of the inner workings of JOSM to know if that makes sense.

[skyper]

See #5619.

[Geimas5]

Replying to skyper:

See #5619.

Hmm, maybe related. Hard for me to judge when the JOSM code is a black box for me. I should note, I never got any conflicts in the conflict manager, which seams central to the discussion in that ticket.

[Geimas5]

Replying to Geimas5:

Replying to skyper:

See #5619.

Hmm, maybe related. Hard for me to judge when the JOSM code is a black box for me. I should note, I never got any conflicts in the conflict manager, which seams central to the discussion in that ticket.

One note, I notice that the "created_by" mentioned in the first comment in that ticket. If the conflict resolution is dependent on the username, it might be worth keeping in mind that in this case I had a conflict with myself.

[GerdP]

I tried this with r15937 and a current version:

• edit your file so that r10810290 is at version 2 (just changed the number)
• upload
• I see the preload condition message shown above, but for different objects
• No conflict is added in the conflict manager
• When I download an area that contains a member of the relation the conflict is generated

I don't know if the popup saying <Precondition failed: Relation 10810290 requires the ways with id in 779691669, which either do not exist, or are not visible> created a conflict in the past?

[Geimas5]

Replying to GerdP:

I tried this with r15937 and a current version:

• edit your file so that r10810290 is at version 2 (just changed the number)
• upload
• I see the preload condition message shown above, but for different objects
• No conflict is added in the conflict manager
• When I download an area that contains a member of the relation the conflict is generated

I don't know if the popup saying <Precondition failed: Relation 10810290 requires the ways with id in 779691669, which either do not exist, or are not visible> created a conflict in the past?

Hmm, I guess it is possible that I missed something when I selected areas for download.

As for if this specific message created a conflict before. I actually don't know. I had not seen it before, I think all my conflicts might have been detected from when I downloaded the areas.

Would it be possible to improve this message, and add a button for updating the data from the server? Even though I have been using JOSM for years, I had not noticed the "Update data" function before submitting this ticket and it is not clear how to proceed from the message.

[GerdP]

I see lots of code in JOSM which probably should produce a conflict for the <Precondition failed: ...> message.
It seems the message "Relation 10810290 requires the ways with id in 779691669, which either do not exist, or are not visible." simply isn't handled yet.

[GerdP]

In ​https://github.com/zerebubuth/openstreetmap-cgimap/blob/master/src/backend/apidb/changeset_upload/relation_updater.cpp
I found two messages which are not yet handled by the JOSM code

      throw http::precondition_failed(
          (boost::format("Relation %1% requires the nodes with id in %2%, "
                         "which either do not exist, or are not visible.") %
           it->first % to_string(it->second))
              .str());
...
      throw http::precondition_failed(
          (boost::format("Relation %1% requires the ways with id in %2%, which "
                         "either do not exist, or are not visible.") %
           it->first % to_string(it->second))
     
         .str());

It should be easy enough to add them to ExceptionUtil.parsePreconditionFailed()

[GerdP]

IIGTR JOSM cannot yet create conflicts from Precondition failed messages which contain the word requires.
It can only handle those which contain is still used by (e.g. when you delete a node which is used by a way)
There is code to handle Way ... requires the nodes ... when the way id is positive, but it produces a wrong conflict.
(you did not delete the way, your way requires nodes which were deleted on the server).
Need much more work that expected...

[GerdP]

Sample message: Precondition failed: Way -174893 requires the nodes with id in 7286378757,7286382920, which either do not exist, or are not visible.

[GerdP]

Patch

• handles negative ids in "requires the " messages
• corrects the translated messages
• downloads either the parents or the children, depending on the message (still used by or requires ... which either do not exist, or are not visible)

Please let me know what you think about the changed message texts.

[GerdP]

Replying to Geimas5:

One note, I notice that the "created_by" mentioned in the first comment in that ticket. If the conflict resolution is dependent on the username, it might be worth keeping in mind that in this case I had a conflict with myself.

Is it possible that you changed the upload strategy to chunked? Please check the preference setting for osm-server.upload-strategy

[GerdP]

Replying to Geimas5:

Would it be possible to improve this message, and add a button for updating the data from the server? Even though I have been using JOSM for years, I had not noticed the "Update data" function before submitting this ticket and it is not clear how to proceed from the message.

A text similar to this is displayed with the patch. In your case it would say Failed to upload relation 10810290. It refers to deleted way 779691669. Please load the way, remove the referrences in the relation, and upload again.
If I got you right you suggest to add a button "Update data" here which would trigger the same action as Ctrl+U?

[Geimas5]

Replying to GerdP:

Replying to Geimas5:

Would it be possible to improve this message, and add a button for updating the data from the server? Even though I have been using JOSM for years, I had not noticed the "Update data" function before submitting this ticket and it is not clear how to proceed from the message.

A text similar to this is displayed with the patch. In your case it would say Failed to upload relation 10810290. It refers to deleted way 779691669. Please load the way, remove the referrences in the relation, and upload again.
If I got you right you suggest to add a button "Update data" here which would trigger the same action as Ctrl+U?

Yes, i did suggest that as a catch-all solution the cases what where not handled specifically. But, the solution you have now implemented, looks better to me.

[GerdP]

In 16407/josm:

fix #18915: "Precondition violation" not fixable from within JOSM

• correct handling of precondition failure responses that contain the word requires so that the correct objects are downloaded. The parents are needed, not the childern.