[Tile-serving] [openstreetmap/mod_tile] tile_storage_hook: Missing tile was not rendered in time. Returning File Not Found (#193)

[mixap]

Hello,
I have a osm_tiles server running in ubuntu16 with Mapnik 3.0, Mod_tile and renderd.  in the apache's log appears the error:

[Mon Mar 18 10:02:03.415398 2019] [tile:debug] [pid 3467] ./src/mod_tile.c(325): [client 10.10.21.80:36776] get_storage_backend: Retrieving storage back end for tile layer 0 in pool 7fdfd430d028 and thread 140599315302272
[Mon Mar 18 10:02:03.415404 2019] [tile:debug] [pid 3467] ./src/mod_tile.c(338): [client 10.10.21.80:36776] get_storage_backend: No storage backends for this lifecycle 7fdfd430d028, creating it in thread 140599315302272
[Mon Mar 18 10:02:03.415409 2019] [tile:debug] [pid 3467] ./src/mod_tile.c(354): [client 10.10.21.80:36776] get_storage_backend: No storage backend in current lifecycle 7fdfd430d028 in thread 140599315302272 for current tile layer 0
debug: init_storage_backend: initialising file storage backend at: /var/lib/mod_tile
[Mon Mar 18 10:02:03.415438 2019] [tile:debug] [pid 3467] ./src/mod_tile.c(1391): [client 10.10.21.80:36776] tile_translate: op(tile_serve) xml(default) mime(image/png) z(14) x(11705) y(6833)
[Mon Mar 18 10:02:03.415444 2019] [tile:info] [pid 3467] [client 10.10.21.80:36776] tile_storage_hook: handler(tile_serve), uri(/osm_tiles/14/11705/6833.png)
[Mon Mar 18 10:02:03.415487 2019] [tile:debug] [pid 3467] ./src/mod_tile.c(375): [client 10.10.21.80:36776] tile_state: determined state of default 11705 6833 14 on store 5632ea052600: Tile size: -1, expired: 1 created: 0
[Mon Mar 18 10:02:03.415496 2019] [tile:debug] [pid 3467] ./src/mod_tile.c(176): [client 10.10.21.80:36776] Connecting to renderd on Unix socket /var/run/renderd/renderd.sock
[Mon Mar 18 10:02:03.415525 2019] [tile:info] [pid 3467] [client 10.10.21.80:36776] Requesting style(default) z(14) x(11705) y(6833) from renderer with priority 5
[Mon Mar 18 10:02:03.416967 2019] [tile:debug] [pid 3467] ./src/mod_tile.c(970): [client 10.10.21.80:36776] tile_storage_hook: Missing tile was not rendered in time. Returning File Not Found

What it means and how I could fix it?
Thanks
Vinod


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