Author: TomH
[Added to the original trac issue at 6.07am, Friday, 27th July 2012]

You need to specify exactly what URL you are hitting, as it will make a big difference to the amount of work the server has to do, not to mention that I can't investigate without knowing that.

That said, it almost certainly is the size - because you are fetching the members it is not just the number of members that matters but the total size and complexity of all the members. The precise details will depend on the URL though, as that controls how far the API is trying to recurse into the members.

Author: NE2
[Added to the original trac issue at 7.16am, Friday, 27th July 2012]

If it helps, relation 416635 does it too. I remember this one also failed before my recent edit to it.

I'm right clicking on the relation in JOSM and selecting 'download members'. It appears the URL being downloaded is http://www.openstreetmap.org/api/0.6/relation/416635/full .

It's definitely not the size, judging by other relations I can download.

Author: TomH
[Added to the original trac issue at 7.26am, Friday, 27th July 2012]

The /full is critical because it means it will try and recurse into all the members, so the size of those will matter as well as the size of the top level relation.

Author: TomH
[Added to the original trac issue at 7.28am, Friday, 27th July 2012]

There are a total of 582 ways and 24746 nodes referenced from that second relation.

Author: TomH
[Added to the original trac issue at 7.32am, Friday, 27th July 2012]

Ah, so it's not actually a timeout, it's the complexity of the SQL query that rails is constructing, which causes Postgres to run out of stack space.

I'll think about increasing the stack limit a bit, but that may need a database server restart. The real solution is to get the relation/full call moved into cgimap where we can control the SQL better.

Author: TomH
[Added to the original trac issue at 7.47am, Friday, 27th July 2012]

I've increased the stack depth limit as much as I can without restarting the server and both of those relations now work - there will doubtless be others which won't though.

Author: NE2
[Added to the original trac issue at 7.52am, Friday, 27th July 2012]

Thanks - I'm still not convinced it's solely size of relation plus elements, but if it works now...