diff options
Diffstat (limited to 'lib/gitlab/database/reindexing/index_selection.rb')
-rw-r--r-- | lib/gitlab/database/reindexing/index_selection.rb | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/lib/gitlab/database/reindexing/index_selection.rb b/lib/gitlab/database/reindexing/index_selection.rb new file mode 100644 index 00000000000..406e70791df --- /dev/null +++ b/lib/gitlab/database/reindexing/index_selection.rb @@ -0,0 +1,36 @@ +# frozen_string_literal: true + +module Gitlab + module Database + module Reindexing + class IndexSelection + include Enumerable + + delegate :each, to: :indexes + + def initialize(candidates) + @candidates = candidates + end + + private + + attr_reader :candidates + + def indexes + # This is an explicit N+1 query: + # Bloat estimates are generally available through a view + # for all indexes. However, estimating bloat for all + # indexes at once is an expensive operation. Therefore, + # we force a N+1 pattern here and estimate bloat on a per-index + # basis. + + @indexes ||= filter_candidates.sort_by(&:bloat_size).reverse + end + + def filter_candidates + candidates.not_recently_reindexed + end + end + end + end +end |