Hi Leon,
I am actually wondering why you use an on-premise Overpass instance to
return "all highways in Europe"...? I am certainly not an expert here,
but I don't think Overpass was ever designed to handle that kind and
size of request, and maybe even more so the potential client app you are
using to visualize the data. I am thus also wondering what client app
you are using to access the data?
E.g. considering you are talking about a local instance of the database,
wouldn't it be a more logical fit, and direct route, to access the data
in QGIS via an ODBC connection and write your queries in standard
(PostGIS) SQL, instead of through Overpass?
Marco
Op 23-10-2018 om 09:17 schreef Leon Boehmer:
Hi All,
We are trying a query which returns all highways in Europe on our
on-premise Overpass. Unfortunately this query currently fails with
"runtime error: open64: 0 No error information /osm3s_v0.7.55_osm_base
Dispatcher_Client::request_read_and_idx::timeout. The server is
probably too busy to handle your request.". By setting maxsize to 5GB
and timeout to 900 we have managed to avoid other errors, but we see
this error far sooner than the 15 minutes we have given the query. We
have managed to trace this message to dispatcher_client.cc
<http://client.cc/>line 224 and see some sort of hardcoded timeout of
100 (counter) x 300ms. Unfortunately my understanding of C++ doesn't
suffice to actually determine what the code is precisely waiting for
and how we can mitigate this particular condition.
The VM Overpass is running on is equipped with 16GB of RAM as well as
SSDs and serves no other query at the same time, so we are pretty
confident it should be able to execute it in a timely fashion.
Kind Regards,
Leon Boehmer.
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