[GraphHopper] Updating Graphs

[Peter K]

Hey Mark,

restarting could be done in several 'flavours'. One use case would be to
refresh the files in-memory and just swap the GraphHopper instances
which requires CPU and RAM on the same machine but involves no down-time
- so very nice but only for rather small areas. Another usecase could be
as you describe but the problem is that the import and preparation could
be too long to be acceptable.

So I currently don't think this can be handled within GraphHopper itself
and is easily implemented outside of it.

Regards,
Peter.

> Hi Peter, I am just installing the new Graphhopper in a windows Server
> environment and it works well under cygwin
>
> I intend to update the graphs on a weekly basis (2G Asia pbf) and a
> simple question, 
>
> If I download the new pbf file and overwrite the old file, will
> graphhopper automatically detect the new file (date stamp diff) or do
> I need to stop graphhopper, delete the graphs and restart graphhopper
> to trigger the rebuild?
>
> If it is the second case, I guess at some stage in the future it may
> be useful to have some kind of semaphore file or other trigger that
> could cause the rebuild of the graph without having ot kill
> graphhopper to help with the background automatic updating? Of course,
> the system woudl have to return Not Available to any calls whilst the
> graph was being rebuilt.
>
> Am interested in your thoughts on the best way to go.
>
> Cheers
>
> Mark Cupitt
>
> "If we change the world, let it bear the mark of our intelligence"
>
> See me on Open Street Map <https://www.openstreetmap.org/user/Mark_Cupitt>
>
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>
>
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