1. 27 Jul, 2018 1 commit
  2. 10 Oct, 2016 1 commit
    • Yorick Peterse's avatar
      Precalculate trending projects · 237c8f66
      Yorick Peterse authored
      This commit introduces a Sidekiq worker that precalculates the list of
      trending projects on a daily basis. The resulting set is stored in a
      database table that is then queried by Project.trending.
      
      This setup means that Unicorn workers no longer _may_ have to calculate
      the list of trending projects. Furthermore it supports filtering without
      any complex caching mechanisms.
      
      The data in the "trending_projects" table is inserted in the same order
      as the project ranking. This means that getting the projects in the
      correct order is simply a matter of:
      
          SELECT projects.*
          FROM projects
          INNER JOIN trending_projects ON trending_projects.project_id = projects.id
          ORDER BY trending_projects.id ASC;
      
      Such a query will only take a few milliseconds at most (as measured on
      GitLab.com), opposed to a few seconds for the query used for calculating
      the project ranks.
      
      The migration in this commit does not require downtime and takes care of
      populating an initial list of trending projects.
      237c8f66