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Fix unnecessary queries when batch-removing statuses, 100x faster (#15387)

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Eugen Rochko 2020-12-22 17:13:55 +01:00 • committed by GitHub
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7 changed files with 168 additions and 100 deletions
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2
app/models/favourite.rb
View file

@ -36,7 +36,7 @@ class Favourite < ApplicationRecord
end
def decrement_cache_counters
return if association(:status).loaded? && (status.marked_for_destruction? || status.marked_for_mass_destruction?)
return if association(:status).loaded? && status.marked_for_destruction?
status&.decrement_count!(:favourites_count)
end
end

12
app/models/status.rb
View file

@ -228,14 +228,6 @@ class Status < ApplicationRecord
@emojis = CustomEmoji.from_text(fields.join(' '), account.domain)
end
def mark_for_mass_destruction!
@marked_for_mass_destruction = true
end
def marked_for_mass_destruction?
@marked_for_mass_destruction
end
def replies_count
status_stat&.replies_count || 0
end
@ -430,7 +422,7 @@ class Status < ApplicationRecord
end
def decrement_counter_caches
return if direct_visibility? || marked_for_mass_destruction?
return if direct_visibility?
account&.decrement_count!(:statuses_count)
reblog&.decrement_count!(:reblogs_count) if reblog?
@ -440,7 +432,7 @@ class Status < ApplicationRecord
def unlink_from_conversations
return unless direct_visibility?
mentioned_accounts = mentions.includes(:account).map(&:account)
mentioned_accounts = (association(:mentions).loaded? ? mentions : mentions.includes(:account)).map(&:account)
inbox_owners = mentioned_accounts.select(&:local?) + (account.local? ? [account] : [])
inbox_owners.each do |inbox_owner|

91
app/services/batched_remove_status_service.rb
View file

@ -3,29 +3,45 @@
class BatchedRemoveStatusService < BaseService
include Redisable
# Delete given statuses and reblogs of them
# Remove statuses from home feeds
# Push delete events to streaming API for home feeds and public feeds
# @param [Enumerable<Status>] statuses A preferably batched array of statuses
# Delete multiple statuses and reblogs of them as efficiently as possible
# @param [Enumerable<Status>] statuses An array of statuses
# @param [Hash] options
# @option [Boolean] :skip_side_effects
# @option [Boolean] :skip_side_effects Do not modify feeds and send updates to streaming API
def call(statuses, **options)
statuses = Status.where(id: statuses.map(&:id)).includes(:account).flat_map { |status| [status] + status.reblogs.includes(:account).to_a }
ActiveRecord::Associations::Preloader.new.preload(statuses, options[:skip_side_effects] ? :reblogs : [:account, reblogs: :account])
@mentions = statuses.each_with_object({}) { |s, h| h[s.id] = s.active_mentions.includes(:account).to_a }
@tags = statuses.each_with_object({}) { |s, h| h[s.id] = s.tags.pluck(:name) }
statuses_and_reblogs = statuses.flat_map { |status| [status] + status.reblogs }
@json_payloads = statuses.each_with_object({}) { |s, h| h[s.id] = Oj.dump(event: :delete, payload: s.id.to_s) }
# The conversations for direct visibility statuses also need
# to be manually updated. This part is not efficient but we
# rely on direct visibility statuses being relatively rare.
statuses_with_account_conversations = statuses.select(&:direct_visibility?)
statuses.each do |status|
status.mark_for_mass_destruction!
status.destroy
ActiveRecord::Associations::Preloader.new.preload(statuses_with_account_conversations, [mentions: :account])
statuses_with_account_conversations.each do |status|
status.send(:unlink_from_conversations)
end
# We do not batch all deletes into one to avoid having a long-running
# transaction lock the database, but we use the delete method instead
# of destroy to avoid all callbacks. We rely on foreign keys to
# cascade the delete faster without loading the associations.
statuses_and_reblogs.each(&:delete)
# Since we skipped all callbacks, we also need to manually
# deindex the statuses
Chewy.strategy.current.update(StatusesIndex, statuses_and_reblogs)
return if options[:skip_side_effects]
ActiveRecord::Associations::Preloader.new.preload(statuses_and_reblogs, :tags)
@tags = statuses_and_reblogs.each_with_object({}) { |s, h| h[s.id] = s.tags.map { |tag| tag.name.mb_chars.downcase } }
@json_payloads = statuses_and_reblogs.each_with_object({}) { |s, h| h[s.id] = Oj.dump(event: :delete, payload: s.id.to_s) }
# Batch by source account
statuses.group_by(&:account_id).each_value do |account_statuses|
statuses_and_reblogs.group_by(&:account_id).each_value do |account_statuses|
account = account_statuses.first.account
next unless account
@ -35,27 +51,31 @@ class BatchedRemoveStatusService < BaseService
end
# Cannot be batched
statuses.each do |status|
unpush_from_public_timelines(status)
redis.pipelined do
statuses_and_reblogs.each do |status|
unpush_from_public_timelines(status)
end
end
end
private
def unpush_from_home_timelines(account, statuses)
recipients = account.followers_for_local_distribution.to_a
recipients << account if account.local?
recipients.each do |follower|
account.followers_for_local_distribution.includes(:user).find_each do |follower|
statuses.each do |status|
FeedManager.instance.unpush_from_home(follower, status)
end
end
return unless account.local?
statuses.each do |status|
FeedManager.instance.unpush_from_home(account, status)
end
end
def unpush_from_list_timelines(account, statuses)
account.lists_for_local_distribution.select(:id, :account_id).each do |list|
account.lists_for_local_distribution.select(:id, :account_id).includes(account: :user).find_each do |list|
statuses.each do |status|
FeedManager.instance.unpush_from_list(list, status)
end
@ -67,26 +87,17 @@ class BatchedRemoveStatusService < BaseService
payload = @json_payloads[status.id]
redis.pipelined do
redis.publish('timeline:public', payload)
if status.local?
redis.publish('timeline:public:local', payload)
else
redis.publish('timeline:public:remote', payload)
end
if status.media_attachments.any?
redis.publish('timeline:public:media', payload)
if status.local?
redis.publish('timeline:public:local:media', payload)
else
redis.publish('timeline:public:remote:media', payload)
end
end
redis.publish('timeline:public', payload)
redis.publish(status.local? ? 'timeline:public:local' : 'timeline:public:remote', payload)
@tags[status.id].each do |hashtag|
redis.publish("timeline:hashtag:#{hashtag.mb_chars.downcase}", payload)
redis.publish("timeline:hashtag:#{hashtag.mb_chars.downcase}:local", payload) if status.local?
end
if status.media_attachments.any?
redis.publish('timeline:public:media', payload)
redis.publish(status.local? ? 'timeline:public:local:media' : 'timeline:public:remote:media', payload)
end
@tags[status.id].each do |hashtag|
redis.publish("timeline:hashtag:#{hashtag}", payload)
redis.publish("timeline:hashtag:#{hashtag}:local", payload) if status.local?
end
end
end

128
app/services/delete_account_service.rb
View file

@ -6,15 +6,21 @@ class DeleteAccountService < BaseService
ASSOCIATIONS_ON_SUSPEND = %w(
account_pins
active_relationships
aliases
block_relationships
blocked_by_relationships
bookmarks
conversation_mutes
conversations
custom_filters
devices
domain_blocks
favourites
featured_tags
follow_requests
identity_proofs
list_accounts
migrations
mute_relationships
muted_by_relationships
notifications
@ -25,6 +31,29 @@ class DeleteAccountService < BaseService
status_pins
).freeze
# The following associations have no important side-effects
# in callbacks and all of their own associations are secured
# by foreign keys, making them safe to delete without loading
# into memory
ASSOCIATIONS_WITHOUT_SIDE_EFFECTS = %w(
account_pins
aliases
conversation_mutes
conversations
custom_filters
devices
domain_blocks
featured_tags
follow_requests
identity_proofs
migrations
mute_relationships
muted_by_relationships
notifications
scheduled_statuses
status_pins
)
ASSOCIATIONS_ON_DESTROY = %w(
reports
targeted_moderation_notes
@ -55,19 +84,25 @@ class DeleteAccountService < BaseService
@options[:skip_activitypub] = true if @options[:skip_side_effects]
reject_follows!
undo_follows!
purge_user!
purge_profile!
distribute_activities!
purge_content!
fulfill_deletion_request!
end
private
def reject_follows!
return if @account.local? || !@account.activitypub? || @options[:skip_activitypub]
def distribute_activities!
return if skip_activitypub?
if @account.local?
delete_actor!
elsif @account.activitypub?
reject_follows!
undo_follows!
end
end
def reject_follows!
# When deleting a remote account, the account obviously doesn't
# actually become deleted on its origin server, i.e. unlike a
# locally deleted account it continues to have access to its home
@ -81,8 +116,6 @@ class DeleteAccountService < BaseService
end
def undo_follows!
return if @account.local? || !@account.activitypub? || @options[:skip_activitypub]
# When deleting a remote account, the account obviously doesn't
# actually become deleted on its origin server, but following relationships
# are severed on our end. Therefore, make the remote server aware that the
@ -97,7 +130,7 @@ class DeleteAccountService < BaseService
def purge_user!
return if !@account.local? || @account.user.nil?
if @options[:reserve_email]
if keep_user_record?
@account.user.disable!
@account.user.invites.where(uses: 0).destroy_all
else
@ -106,34 +139,52 @@ class DeleteAccountService < BaseService
end
def purge_content!
distribute_delete_actor! if @account.local? && !@options[:skip_side_effects]
purge_user!
purge_profile!
purge_statuses!
purge_media_attachments!
purge_polls!
purge_generated_notifications!
purge_other_associations!
@account.destroy unless keep_account_record?
end
def purge_statuses!
@account.statuses.reorder(nil).find_in_batches do |statuses|
statuses.reject! { |status| reported_status_ids.include?(status.id) } if @options[:reserve_username]
BatchedRemoveStatusService.new.call(statuses, skip_side_effects: @options[:skip_side_effects])
end
statuses.reject! { |status| reported_status_ids.include?(status.id) } if keep_account_record?
BatchedRemoveStatusService.new.call(statuses, skip_side_effects: skip_side_effects?)
end
end
def purge_media_attachments!
@account.media_attachments.reorder(nil).find_each do |media_attachment|
next if @options[:reserve_username] && reported_status_ids.include?(media_attachment.status_id)
next if keep_account_record? && reported_status_ids.include?(media_attachment.status_id)
media_attachment.destroy
end
end
def purge_polls!
@account.polls.reorder(nil).find_each do |poll|
next if @options[:reserve_username] && reported_status_ids.include?(poll.status_id)
next if keep_account_record? && reported_status_ids.include?(poll.status_id)
# We can safely delete the poll rather than destroy it, as any non-reported
# status should have been deleted already, as long as we take care of
# notifications.
Notification.where(poll: poll).delete_all
poll.delete
end
end
def purge_generated_notifications!
# By deleting polls and statuses without callbacks, we've left behind
# polymorphically associated notifications generated by this account
Notification.where(from_account: @account).in_batches.delete_all
end
def purge_other_associations!
associations_for_destruction.each do |association_name|
destroy_all(@account.public_send(association_name))
purge_association(association_name)
end
@account.destroy unless @options[:reserve_username]
end
def purge_profile!
@ -141,7 +192,7 @@ class DeleteAccountService < BaseService
# there is no point wasting time updating
# its values first
return unless @options[:reserve_username]
return unless keep_account_record?
@account.silenced_at = nil
@account.suspended_at = @options[:suspended_at] || Time.now.utc
@ -156,6 +207,7 @@ class DeleteAccountService < BaseService
@account.followers_count = 0
@account.following_count = 0
@account.moved_to_account = nil
@account.also_known_as = []
@account.trust_level = :untrusted
@account.avatar.destroy
@account.header.destroy
@ -166,11 +218,17 @@ class DeleteAccountService < BaseService
@account.deletion_request&.destroy
end
def destroy_all(association)
association.in_batches.destroy_all
def purge_association(association_name)
association = @account.public_send(association_name)
if ASSOCIATIONS_WITHOUT_SIDE_EFFECTS.include?(association_name)
association.in_batches.delete_all
else
association.in_batches.destroy_all
end
end
def distribute_delete_actor!
def delete_actor!
ActivityPub::DeliveryWorker.push_bulk(delivery_inboxes) do |inbox_url|
[delete_actor_json, @account.id, inbox_url]
end
@ -197,10 +255,26 @@ class DeleteAccountService < BaseService
end
def associations_for_destruction
if @options[:reserve_username]
if keep_account_record?
ASSOCIATIONS_ON_SUSPEND
else
ASSOCIATIONS_ON_SUSPEND + ASSOCIATIONS_ON_DESTROY
end
end
def keep_user_record?
@options[:reserve_email]
end
def keep_account_record?
@options[:reserve_username]
end
def skip_side_effects?
@options[:skip_side_effects]
end
def skip_activitypub?
@options[:skip_activitypub]
end
end

5
config/initializers/chewy.rb
View file

@ -12,6 +12,10 @@ Chewy.settings = {
sidekiq: { queue: 'pull' },
}
# We use our own async strategy even outside the request-response
# cycle, which takes care of checking if ElasticSearch is enabled
# or not. However, mind that for the Rails console, the :urgent
# strategy is set automatically with no way to override it.
Chewy.root_strategy = :custom_sidekiq
Chewy.request_strategy = :custom_sidekiq
Chewy.use_after_commit_callbacks = false
@ -37,6 +41,7 @@ Elasticsearch::Transport::Client.prepend Module.new {
super arguments
end
}
Elasticsearch::API::Indices::IndicesClient.prepend Module.new {
def create(arguments = {})
arguments[:include_type_name] = true

25
lib/chewy/strategy/custom_sidekiq.rb
View file

@ -2,29 +2,10 @@
module Chewy
class Strategy
class CustomSidekiq < Base
class Worker
include ::Sidekiq::Worker
sidekiq_options queue: 'pull'
def perform(type, ids, options = {})
options[:refresh] = !Chewy.disable_refresh_async if Chewy.disable_refresh_async
type.constantize.import!(ids, options)
end
class CustomSidekiq < Sidekiq
def update(_type, _objects, _options = {})
super if Chewy.enabled?
end
def update(type, objects, _options = {})
return unless Chewy.enabled?
ids = type.root.id ? Array.wrap(objects) : type.adapter.identify(objects)
return if ids.empty?
Worker.perform_async(type.name, ids)
end
def leave; end
end
end
end

5
spec/services/batched_remove_status_service_spec.rb
View file

@ -26,6 +26,11 @@ RSpec.describe BatchedRemoveStatusService, type: :service do
subject.call([status1, status2])
end
it 'removes statuses' do
expect { Status.find(status1.id) }.to raise_error ActiveRecord::RecordNotFound
expect { Status.find(status2.id) }.to raise_error ActiveRecord::RecordNotFound
end
it 'removes statuses from author\'s home feed' do
expect(HomeFeed.new(alice).get(10)).to_not include([status1.id, status2.id])
end