blob: 2d384f2f9e23e0452cdb6300e26c1c183a48f5cd (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
# frozen_string_literal: true
module Gitlab
module Database
module Reindexing
class IndexSelection
include Enumerable
# Only reindex indexes with a relative bloat level (bloat estimate / size) higher than this
MINIMUM_RELATIVE_BLOAT = 0.2
# Only consider indexes beyond this size (before reindexing)
INDEX_SIZE_MINIMUM = 1.gigabyte
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 ||= candidates
.not_recently_reindexed
.where('ondisk_size_bytes >= ?', INDEX_SIZE_MINIMUM)
.sort_by(&:relative_bloat_level) # forced N+1
.reverse
.select { |candidate| candidate.relative_bloat_level >= MINIMUM_RELATIVE_BLOAT }
end
end
end
end
end
|
