[OSM-dev] Fail to get OsmChange for some changesets

Manchun Yao manchuny at microsoft.com
Tue Oct 5 02:27:34 BST 2010

Hi Shaun, 

Thanks for your explanation. 

Does the system caches the generated xml? I used "wget" to retrieve the changeset. It tried multiple times and never succeeded. 

Is there an API call to retrieve a change set, whose number of changes is close or above the limit?  

If a change set generated before v0.6, what API shall I use to get the OsmChange? 

I know the impact of these requests and put some "sleep" between consecutive requests.  There aren't many requests either. 

From: Shaun McDonald [mailto:shaun at shaunmcdonald.me.uk] 
Sent: Monday, October 04, 2010 5:06 PM
To: Manchun Yao
Cc: dev at openstreetmap.org
Subject: Re: [OSM-dev] Fail to get OsmChange for some changesets

The reason why it doesn't come back is because it takes a very long time to generate the xml that needs to be returned, and so you'll get a time out. It is very close to the limit of the number of changes within a changeset. It is a generated changeset from before the API 0.6 transition, thus not a user error.

I hope that you are not hitting the api for a large number of these requests, as you are likely to be blocked if you do so.


On 5 Oct 2010, at 00:49, Manchun Yao wrote:

I am learning how the change set works in OSM.  I assume that if I can apply the change sets of a particular area one by one then I can obtain the current osm map of that area. Is this a valid assumption?
I picked the Boulder, Colorado area since the number of changes there, roughly 350,  is about right.   During the tests, I noticed that I could not obtain the OsmChange of the following changes: 145015, 4318130, 4318132, 4318136.  
For example:
The request http://www.openstreetmap.org/api/0.6/changeset/145015 will return the tags for the change 145015.
However, request http://www.openstreetmap.org/api/0.6/changeset/145015/download never comes back.  The serve seems stuck on this request and never sends any meaningful response back.
What's wrong with these change sets?  
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