[MapProxy] PostgreSQL connection pooling with Mapnik source

Jeremy Palmer JPalmer at linz.govt.nz
Thu Nov 3 11:39:22 PDT 2016

Hi All,

I’m testing MapProxy for seeding tiles to a cache using a mapnik source which has multiple PostGIS layers. I’ve noticed that PostGIS connections are not being reused between mapnik tile render sessions. Establishing a new PG connection per session is going to add overhead when rendering millions of tiles.

Is anyone aware of this issue or do I need to do extra configuration?

My command to seed is:

mapproxy-seed -f maptiles.yml -s seeds.yml -c 4

My mapnik 3.0.12 XML is using the default PostGIS parameters and should reuse connections according to the documentation:


       <Parameter name="type"><![CDATA[postgis]]></Parameter>
       <Parameter name="table"><![CDATA[(Select * From bridge) AS Bridge]]></Parameter>
       <Parameter name="key_field"><![CDATA[]]></Parameter>
       <Parameter name="geometry_field"><![CDATA[]]></Parameter>
       <Parameter name="extent_cache"><![CDATA[auto]]></Parameter>
       <Parameter name="extent"><![CDATA[18588719.8615001,-5939257.42937042,19869879.1530354,-4093884.06936018]]></Parameter>
       <Parameter name="dbname"><![CDATA[nz_data]]></Parameter>
       <Parameter name="host"><![CDATA[localhost]]></Parameter>
       <Parameter name="port"><![CDATA[5432]]></Parameter>
       <Parameter name="user"><![CDATA[postgres]]></Parameter>
       <Parameter name="password"><![CDATA[postgres]]></Parameter>


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