44 lines
1.3 KiB
Ruby
44 lines
1.3 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Database
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module Reindexing
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class IndexSelection
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include Enumerable
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# Only reindex indexes with a relative bloat level (bloat estimate / size) higher than this
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MINIMUM_RELATIVE_BLOAT = 0.2
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# Only consider indexes with a total ondisk size in this range (before reindexing)
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INDEX_SIZE_RANGE = (1.gigabyte..100.gigabyte).freeze
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delegate :each, to: :indexes
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def initialize(candidates)
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@candidates = candidates
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end
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private
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attr_reader :candidates
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def indexes
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# This is an explicit N+1 query:
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# Bloat estimates are generally available through a view
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# for all indexes. However, estimating bloat for all
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# indexes at once is an expensive operation. Therefore,
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# we force a N+1 pattern here and estimate bloat on a per-index
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# basis.
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@indexes ||= candidates
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.not_recently_reindexed
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.where(ondisk_size_bytes: INDEX_SIZE_RANGE)
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.sort_by(&:relative_bloat_level) # forced N+1
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.reverse
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.select { |candidate| candidate.relative_bloat_level >= MINIMUM_RELATIVE_BLOAT }
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end
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end
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end
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end
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end
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