Enhance performance of counting local LFS objects
Add an index to the `file_store` column on `lfs_objects`. This makes counting local objects faster. Also, there is no longer need to check for objects with `file_store` being `NULL`. See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18557 --- ### Query plans #### Before & with `NULL` ``` Aggregate (cost=113495.96..113495.97 rows=1 width=8) (actual time=1691.394..1691.394 rows=1 loops=1) -> Seq Scan on lfs_objects (cost=0.00..106415.50 rows=2832186 width=0) (actual time=0.012..1312.488 rows=2852607 loops=1) Filter: ((file_store = 1) OR (file_store IS NULL)) Rows Removed by Filter: 131 Planning time: 0.077 ms Execution time: 1691.433 ms ``` #### Before, without `NULL` ``` Aggregate (cost=113495.96..113495.97 rows=1 width=8) (actual time=856.423..856.424 rows=1 loops=1) -> Seq Scan on lfs_objects (cost=0.00..106415.50 rows=2832186 width=0) (actual time=0.012..672.181 rows=2852607 loops=1) Filter: (file_store = 1) Rows Removed by Filter: 131 Planning time: 0.128 ms Execution time: 856.470 ms ``` #### After & with `NULL` ``` Aggregate (cost=68819.95..68819.96 rows=1 width=8) (actual time=583.355..583.355 rows=1 loops=1) -> Index Only Scan using index_lfs_objects_on_file_store on lfs_objects (cost=0.43..61688.35 rows=2852643 width=0) (actual time=0.028..399.177 rows=2852607 loops=1) Filter: ((file_store = 1) OR (file_store IS NULL)) Rows Removed by Filter: 131 Heap Fetches: 867 Planning time: 0.096 ms Execution time: 583.404 ms ``` #### After, without `NULL` ``` Aggregate (cost=68817.29..68817.30 rows=1 width=8) (actual time=490.550..490.551 rows=1 loops=1) -> Index Only Scan using index_lfs_objects_on_file_store on lfs_objects (cost=0.43..61685.68 rows=2852643 width=0) (actual time=0.040..311.760 rows=2852607 loops=1) Index Cond: (file_store = 1) Heap Fetches: 831 Planning time: 0.294 ms Execution time: 490.590 ms ``` Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/6067
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@ -7,7 +7,7 @@ class LfsObject < ActiveRecord::Base
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has_many :lfs_objects_projects, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
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has_many :projects, through: :lfs_objects_projects
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scope :with_files_stored_locally, -> { where(file_store: [nil, LfsObjectUploader::Store::LOCAL]) }
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scope :with_files_stored_locally, -> { where(file_store: LfsObjectUploader::Store::LOCAL) }
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validates :oid, presence: true, uniqueness: true
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@ -26,7 +26,7 @@ class LfsObject < ActiveRecord::Base
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end
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def local_store?
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[nil, LfsObjectUploader::Store::LOCAL].include?(self.file_store)
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file_store == LfsObjectUploader::Store::LOCAL
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end
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# rubocop: disable DestroyAll
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@ -0,0 +1,5 @@
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---
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title: Enhance performance of counting local LFS objects
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merge_request: 22143
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author:
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type: performance
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@ -0,0 +1,17 @@
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# frozen_string_literal: true
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class AddIndexToLfsObjectsFileStore < ActiveRecord::Migration
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include Gitlab::Database::MigrationHelpers
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DOWNTIME = false
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disable_ddl_transaction!
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def up
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add_concurrent_index :lfs_objects, :file_store
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end
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def down
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remove_concurrent_index :lfs_objects, :file_store
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end
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end
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@ -1167,6 +1167,7 @@ ActiveRecord::Schema.define(version: 20181017001059) do
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t.integer "file_store"
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end
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add_index "lfs_objects", ["file_store"], name: "index_lfs_objects_on_file_store", using: :btree
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add_index "lfs_objects", ["oid"], name: "index_lfs_objects_on_oid", unique: true, using: :btree
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create_table "lfs_objects_projects", force: :cascade do |t|
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@ -2,12 +2,6 @@ require 'spec_helper'
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describe LfsObject do
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describe '#local_store?' do
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it 'returns true when file_store is nil' do
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subject.file_store = nil
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expect(subject.local_store?).to eq true
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end
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it 'returns true when file_store is equal to LfsObjectUploader::Store::LOCAL' do
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subject.file_store = LfsObjectUploader::Store::LOCAL
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@ -83,19 +77,6 @@ describe LfsObject do
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describe 'file is being stored' do
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let(:lfs_object) { create(:lfs_object, :with_file) }
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context 'when object has nil store' do
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before do
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lfs_object.update_column(:file_store, nil)
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lfs_object.reload
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end
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it 'is stored locally' do
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expect(lfs_object.file_store).to be(nil)
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expect(lfs_object.file).to be_file_storage
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expect(lfs_object.file.object_store).to eq(ObjectStorage::Store::LOCAL)
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end
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end
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context 'when existing object has local store' do
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it 'is stored locally' do
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expect(lfs_object.file_store).to be(ObjectStorage::Store::LOCAL)
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