etags and last-modified headers sent by Kartotherian are problematic:
Both could just be dropped.
| Subject | Repo | Branch | Lines +/- | |
|---|---|---|---|---|
| kartotherian/tilerator: set Last-Modified header | operations/puppet | production | +1 -0 |
PR kartotherian set Last-Modified header: https://github.com/kartotherian/kartotherian/pull/53
PR tilerator set Last-Modified header: https://github.com/kartotherian/kartotherian/pull/53
Change 421522 had a related patch set uploaded (by Sbisson; owner: Sbisson):
[operations/puppet@production] kartotherian/tilerator: set Last-Modified header
PR produce etag based on tile content: https://github.com/kartotherian/cassandra/pull/5
etags is inconsistent between nodes, which might lead to more cache miss than needed
I'm not sure what this means or if it's still true. I've tested maps-test2001, maps-test2002 and maps-test2003 for a specific tile (osm-intl/13/4284/2883.png) and all 3 returned the same ETag ("c3346c8890d85d6585b0ef5a7aca0410").
The ETag logic in tilelive-vector looks sane as long as a upstream source provides an etag as well. I've submitted https://github.com/kartotherian/cassandra/pull/5 to do just that in the cassandra source.