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# 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
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