Improve stability by disabling dynamic leaderboard queries #1105
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Due to the extensive computational demand of dynamic queries for various MapRoulette leaderboards — including those for global standings, project-specific, challenge-specific, and country-specific rankings — system stability issues have been observed. This patch disables the execution of dynamic leaderboard calculations. Requests triggering a dynamic query now result in an HTTP 400 response. The below leaderboards will not function until a workaround or alternative solution is determined: - Project-specific leaderboards - Challenge-specific leaderboards - Leaderboards featuring items not currently enabled - Country-specific leaderboards, excluding the global leaderboard, when multiple countries are selected - Any use of custom date ranges outside the predefined set of durations
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Created to resolve #1102 |
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Due to the extensive computational demand of dynamic queries for various MapRoulette leaderboards — including those for global standings, project-specific, challenge-specific, and country-specific rankings — system stability issues have been observed.
This patch disables the execution of dynamic leaderboard calculations. Requests triggering a dynamic query now result in an HTTP 400 response.
There was a presumption in the leaderboard code that every user was in the pre-generated leaderboard, and if they were not it would regen the entire thing, for all users, dynamically and per request. So it quickly overwhelmed the DB backend when there were a handful of "new" MapRoulette users to the site. This was especially unfortunate for group mapping parties.
The below leaderboards will not function until a workaround or alternative solution is determined:
Related issues reported by users:
Edit: One leaderboard is so infrequently used that I did not modify its query
/data/reviewer/leaderboard.