{"action":"created","issue":{"url":"https://api.github.com/repos/openstreetmap/mod_tile/issues/182","repository_url":"https://api.github.com/repos/openstreetmap/mod_tile","labels_url":"https://api.github.com/repos/openstreetmap/mod_tile/issues/182/labels{/name}","comments_url":"https://api.github.com/repos/openstreetmap/mod_tile/issues/182/comments","events_url":"https://api.github.com/repos/openstreetmap/mod_tile/issues/182/events","html_url":"https://github.com/openstreetmap/mod_tile/issues/182","id":333070125,"node_id":"MDU6SXNzdWUzMzMwNzAxMjU=","number":182,"title":"Preventing mod_tile rendering from blocking the serving of cached tiles?","user":{"login":"Overv","id":285063,"node_id":"MDQ6VXNlcjI4NTA2Mw==","avatar_url":"https://avatars3.githubusercontent.com/u/285063?v=4","gravatar_id":"","url":"https://api.github.com/users/Overv","html_url":"https://github.com/Overv","followers_url":"https://api.github.com/users/Overv/followers","following_url":"https://api.github.com/users/Overv/following{/other_user}","gists_url":"https://api.github.com/users/Overv/gists{/gist_id}","starred_url":"https://api.github.com/users/Overv/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Overv/subscriptions","organizations_url":"https://api.github.com/users/Overv/orgs","repos_url":"https://api.github.com/users/Overv/repos","events_url":"https://api.github.com/users/Overv/events{/privacy}","received_events_url":"https://api.github.com/users/Overv/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2018-06-17T15:16:14Z","updated_at":"2018-06-17T19:49:49Z","closed_at":null,"author_association":"NONE","body":"I've noticed that when all mod_tile workers are busy rendering tiles, no other tiles can be served at all, even if they're already in the cache. Is there a way to have mod_tile always serve previously rendered tiles instead of blocking on all requests when all workers are busy rendering?"},"comment":{"url":"https://api.github.com/repos/openstreetmap/mod_tile/issues/comments/397901992","html_url":"https://github.com/openstreetmap/mod_tile/issues/182#issuecomment-397901992","issue_url":"https://api.github.com/repos/openstreetmap/mod_tile/issues/182","id":397901992,"node_id":"MDEyOklzc3VlQ29tbWVudDM5NzkwMTk5Mg==","user":{"login":"woodpeck","id":705471,"node_id":"MDQ6VXNlcjcwNTQ3MQ==","avatar_url":"https://avatars1.githubusercontent.com/u/705471?v=4","gravatar_id":"","url":"https://api.github.com/users/woodpeck","html_url":"https://github.com/woodpeck","followers_url":"https://api.github.com/users/woodpeck/followers","following_url":"https://api.github.com/users/woodpeck/following{/other_user}","gists_url":"https://api.github.com/users/woodpeck/gists{/gist_id}","starred_url":"https://api.github.com/users/woodpeck/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/woodpeck/subscriptions","organizations_url":"https://api.github.com/users/woodpeck/orgs","repos_url":"https://api.github.com/users/woodpeck/repos","events_url":"https://api.github.com/users/woodpeck/events{/privacy}","received_events_url":"https://api.github.com/users/woodpeck/received_events","type":"User","site_admin":false},"created_at":"2018-06-17T19:49:49Z","updated_at":"2018-06-17T19:49:49Z","author_association":"CONTRIBUTOR","body":"What you describe must have another reason than you think.\r\n\r\nWhen mod_tile finds a tile in the cache that is not old, it will deliver the tile without even talking to renderd, i.e. mod_tile at that point wouldn't even *know* whether renderd is under load or not. \r\n\r\nYou could be seeing congestion on the Apache side (depending on which MPM you have and how it is configured) - try to request a harmless static page, does that work?\r\n\r\nOr you could be seeing disk congestion so bad that mod_tile cannot even access the meta tile and extract the PNG from it. (unlikely!)\r\n\r\nOr, you might have an old tile in the cache, and depending on the `ModTileRequestTimeout` setting, mod_tile might try to have the old tile rendered before handing out an old one. This would, however, not mean that old tiles are never delivered - they would be delievered after `ModTileRequestTimeout` seconds.\r\n"}}
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