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PERF: Keep track of first unread PM and first unread group PM for user.

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This optimization helps to filter away topics so that the joins on
related tables when querying for unread messages is not expensive.
This commit is contained in:
Guo Xiang Tan 2020-09-03 14:02:15 +08:00 committed by Alan Guo Xiang Tan
parent 0398271f87
commit 9b75d95fc6
11 changed files with 326 additions and 6 deletions
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3
app/jobs/scheduled/ensure_db_consistency.rb
View File

@ -35,6 +35,9 @@ module Jobs
UserStat.ensure_consistency!(13.hours.ago)
measure(UserStat)
GroupUser.ensure_consistency!(13.hours.ago)
measure(GroupUser)
Rails.logger.debug(format_measure)
nil
end

46
app/models/group_user.rb
View File

@ -19,6 +19,52 @@ class GroupUser < ActiveRecord::Base
NotificationLevels.all
end
def self.ensure_consistency!(last_seen = 1.hour.ago)
update_first_unread_pm(last_seen)
end
def self.update_first_unread_pm(last_seen, limit: 10_000)
DB.exec(<<~SQL, archetype: Archetype.private_message, last_seen: last_seen, limit: limit)
UPDATE group_users gu
SET first_unread_pm_at = Y.min_date
FROM (
SELECT
X.group_id,
X.user_id,
X.min_date
FROM (
SELECT
gu2.group_id,
gu2.user_id,
MIN(t.updated_at) min_date
FROM group_users gu2
INNER JOIN topic_allowed_groups tag ON tag.group_id = gu2.group_id
INNER JOIN topics t ON t.id = tag.topic_id
INNER JOIN users u ON u.id = gu2.user_id
LEFT JOIN topic_users tu ON t.id = tu.topic_id AND tu.user_id = gu2.user_id
WHERE t.deleted_at IS NULL
AND t.archetype = :archetype
AND tu.last_read_post_number < CASE
WHEN u.admin OR u.moderator
THEN t.highest_staff_post_number
ELSE t.highest_post_number
END
AND (COALESCE(tu.notification_level, 1) >= 2)
GROUP BY gu2.user_id, gu2.group_id
) AS X
WHERE X.user_id IN (
SELECT id
FROM users
WHERE last_seen_at IS NOT NULL
AND last_seen_at > :last_seen
ORDER BY last_seen_at DESC
LIMIT :limit
)
) Y
WHERE gu.user_id = Y.user_id AND gu.group_id = Y.group_id
SQL
end
protected
def set_notification_level

25
app/models/post_timing.rb
View File

@ -75,7 +75,9 @@ class PostTiming < ActiveRecord::Base
topic.posts.find_by(post_number: post_number).decrement!(:reads)
if !topic.private_message?
if topic.private_message?
set_minimum_first_unread_pm!(topic: topic, user_id: user.id, date: topic.updated_at)
else
set_minimum_first_unread!(user_id: user.id, date: topic.updated_at)
end
end
@ -101,6 +103,27 @@ class PostTiming < ActiveRecord::Base
end
end
def self.set_minimum_first_unread_pm!(topic:, user_id:, date:)
if topic.topic_allowed_users.exists?(user_id: user_id)
UserStat.where("first_unread_pm_at > ? AND user_id = ?", date, user_id)
.update_all(first_unread_pm_at: date)
else
DB.exec(<<~SQL, date: date, user_id: user_id, topic_id: topic.id)
UPDATE group_users gu
SET first_unread_pm_at = :date
FROM (
SELECT
gu2.user_id,
gu2.group_id
FROM group_users gu2
INNER JOIN topic_allowed_groups tag ON tag.group_id = gu2.group_id AND tag.topic_id = :topic_id
WHERE gu2.user_id = :user_id
) Y
WHERE gu.user_id = Y.user_id AND gu.group_id = Y.group_id
SQL
end
end
def self.set_minimum_first_unread!(user_id:, date:)
DB.exec(<<~SQL, date: date, user_id: user_id)
UPDATE user_stats

53
app/models/user_stat.rb
View File

@ -12,10 +12,59 @@ class UserStat < ActiveRecord::Base
update_distinct_badge_count
update_view_counts(last_seen)
update_first_unread(last_seen)
update_first_unread_pm(last_seen)
end
def self.update_first_unread(last_seen, limit: 10_000)
DB.exec(<<~SQL, min_date: last_seen, limit: limit, now: 10.minutes.ago)
UPDATE_UNREAD_MINUTES_AGO = 10
UPDATE_UNREAD_USERS_LIMIT = 10_000
def self.update_first_unread_pm(last_seen, limit: UPDATE_UNREAD_USERS_LIMIT)
DB.exec(<<~SQL, archetype: Archetype.private_message, now: UPDATE_UNREAD_MINUTES_AGO.minutes.ago, last_seen: last_seen, limit: limit)
UPDATE user_stats us
SET first_unread_pm_at = COALESCE(Z.min_date, :now)
FROM (
SELECT
Y.user_id,
Y.min_date
FROM (
SELECT
u1.id user_id,
X.min_date
FROM users u1
LEFT JOIN (
SELECT
tau.user_id,
MIN(t.updated_at) min_date
FROM topic_allowed_users tau
INNER JOIN topics t ON t.id = tau.topic_id
INNER JOIN users u ON u.id = tau.user_id
LEFT JOIN topic_users tu ON t.id = tu.topic_id AND tu.user_id = tau.user_id
WHERE t.deleted_at IS NULL
AND t.archetype = :archetype
AND tu.last_read_post_number < CASE
WHEN u.admin OR u.moderator
THEN t.highest_staff_post_number
ELSE t.highest_post_number
END
AND (COALESCE(tu.notification_level, 1) >= 2)
GROUP BY tau.user_id
) AS X ON X.user_id = u1.id
) AS Y
WHERE Y.user_id IN (
SELECT id
FROM users
WHERE last_seen_at IS NOT NULL
AND last_seen_at > :last_seen
ORDER BY last_seen_at DESC
LIMIT :limit
)
) AS Z
WHERE us.user_id = Z.user_id
SQL
end
def self.update_first_unread(last_seen, limit: UPDATE_UNREAD_USERS_LIMIT)
DB.exec(<<~SQL, min_date: last_seen, limit: limit, now: UPDATE_UNREAD_MINUTES_AGO.minutes.ago)
UPDATE user_stats us
SET first_unread_at = COALESCE(Y.min_date, :now)
FROM (

16
db/migrate/20200902054531_add_first_unread_pm_a_to_group_user.rb Normal file
View File

@ -0,0 +1,16 @@
# frozen_string_literal: true
class AddFirstUnreadPmAToGroupUser < ActiveRecord::Migration[6.0]
def up
add_column :group_users, :first_unread_pm_at, :datetime, null: false, default: -> { 'CURRENT_TIMESTAMP' }
execute <<~SQL
UPDATE group_users gu
SET first_unread_pm_at = gu.created_at
SQL
end
def down
raise ActiveRecord::IrreversibleMigration
end
end

18
db/migrate/20200902082203_add_first_unread_pm_at_to_user_stats.rb Normal file
View File

@ -0,0 +1,18 @@
# frozen_string_literal: true
class AddFirstUnreadPmAtToUserStats < ActiveRecord::Migration[6.0]
def up
add_column :user_stats, :first_unread_pm_at, :datetime, null: false, default: -> { 'CURRENT_TIMESTAMP' }
execute <<~SQL
UPDATE user_stats us
SET first_unread_pm_at = u.created_at
FROM users u
WHERE u.id = us.user_id
SQL
end
def down
raise ActiveRecord::IrreversibleMigration
end
end

18
db/post_migrate/20200903045539_add_index_topics_on_timestamps_private.rb Normal file
View File

@ -0,0 +1,18 @@
# frozen_string_literal: true
class AddIndexTopicsOnTimestampsPrivate < ActiveRecord::Migration[6.0]
disable_ddl_transaction!
def up
execute <<~SQL
CREATE INDEX CONCURRENTLY IF NOT EXISTS
index_topics_on_timestamps_private
ON topics (bumped_at, created_at, updated_at)
WHERE deleted_at IS NULL AND archetype = 'private_message'
SQL
end
def down
raise ActiveRecord::IrreversibleMigration
end
end

16
lib/topic_query.rb
View File

@ -960,9 +960,19 @@ class TopicQuery
def unread_messages(params)
query = TopicQuery.unread_filter(
messages_for_groups_or_user(params[:my_group_ids]),
@user&.id,
staff: @user&.staff?)
.limit(params[:count])
@user.id,
staff: @user.staff?
)
first_unread_pm_at =
if params[:my_group_ids].present?
GroupUser.where(user_id: @user.id, group_id: params[:my_group_ids]).minimum(:first_unread_pm_at)
else
UserStat.where(user_id: @user.id).pluck(:first_unread_pm_at).first
end
query = query.where("topics.updated_at >= ?", first_unread_pm_at) if first_unread_pm_at
query = query.limit(params[:count]) if params[:count]
query
end

60
spec/models/group_user_spec.rb
View File

@ -160,4 +160,64 @@ describe GroupUser do
expect(TagUser.lookup(user, :watching_first_post).pluck(:tag_id)).to eq([tag4.id])
end
end
describe '#ensure_consistency!' do
fab!(:group) { Fabricate(:group) }
fab!(:pm_post) { Fabricate(:private_message_post) }
fab!(:pm_topic) do
pm_post.topic.tap { |t| t.allowed_groups << group }
end
fab!(:user) do
Fabricate(:user, last_seen_at: Time.zone.now).tap do |u|
group.add(u)
TopicUser.change(u.id, pm_topic.id,
notification_level: TopicUser.notification_levels[:tracking],
last_read_post_number: pm_post.post_number
)
end
end
# User that is not tracking topic
fab!(:user_2) do
Fabricate(:user, last_seen_at: Time.zone.now).tap do |u|
group.add(u)
TopicUser.change(u.id, pm_topic.id,
notification_level: TopicUser.notification_levels[:regular],
last_read_post_number: pm_post.post_number
)
end
end
# User that has not been seen
fab!(:user_3) do
Fabricate(:user).tap do |u|
group.add(u)
TopicUser.change(u.id, pm_topic.id,
notification_level: TopicUser.notification_levels[:tracking],
last_read_post_number: pm_post.post_number
)
end
end
it 'updates first unread pm timestamp correctly' do
freeze_time 10.minutes.from_now
post = create_post(
user: pm_topic.user,
topic_id: pm_topic.id
)
GroupUser.ensure_consistency!
expect(group.group_users.find_by(user_id: user.id).first_unread_pm_at).to eq_time(post.topic.updated_at)
expect(group.group_users.find_by(user_id: user_2.id).first_unread_pm_at).to_not eq_time(post.topic.updated_at)
expect(group.group_users.find_by(user_id: user_3.id).first_unread_pm_at).to_not eq_time(post.topic.updated_at)
end
end
end

37
spec/models/post_timing_spec.rb
View File

@ -184,4 +184,41 @@ describe PostTiming do
expect(post.reload.reads).to eq initial_read_count
end
end
describe '.destroy_last_for' do
it 'updates first unread for a user correctly when topic is public' do
post = Fabricate(:post)
post.topic.update!(updated_at: 10.minutes.ago)
PostTiming.process_timings(post.user, post.topic_id, 1, [[post.post_number, 100]])
PostTiming.destroy_last_for(post.user, post.topic_id)
expect(post.user.user_stat.reload.first_unread_at).to eq_time(post.topic.updated_at)
end
it 'updates first unread for a user correctly when topic is a pm' do
post = Fabricate(:private_message_post)
post.topic.update!(updated_at: 10.minutes.ago)
PostTiming.process_timings(post.user, post.topic_id, 1, [[post.post_number, 100]])
PostTiming.destroy_last_for(post.user, post.topic_id)
expect(post.user.user_stat.reload.first_unread_pm_at).to eq_time(post.topic.updated_at)
end
it 'updates first unread for a user correctly when topic is a group pm' do
topic = Fabricate(:private_message_topic, updated_at: 10.minutes.ago)
post = Fabricate(:post, topic: topic)
user = Fabricate(:user)
group = Fabricate(:group)
group.add(user)
topic.allowed_groups << group
PostTiming.process_timings(user, topic.id, 1, [[post.post_number, 100]])
PostTiming.destroy_last_for(user, topic.id)
expect(GroupUser.find_by(user: user, group: group).first_unread_pm_at)
.to eq_time(post.topic.updated_at)
end
end
end

40
spec/models/user_stat_spec.rb
View File

@ -88,6 +88,46 @@ describe UserStat do
post.user.user_stat.reload
expect(post.user.user_stat.first_unread_at).to eq_time(Time.zone.now)
end
it 'updates first unread pm timestamp correctly' do
pm_topic = Fabricate(:private_message_topic)
user = pm_topic.user
user.update!(last_seen_at: Time.zone.now)
create_post(user: user, topic_id: pm_topic.id)
TopicUser.change(user.id, pm_topic.id,
notification_level: TopicUser.notification_levels[:tracking]
)
# user that is not tracking PM topic
user_2 = Fabricate(:user, last_seen_at: Time.zone.now)
pm_topic.allowed_users << user_2
TopicUser.change(user_2.id, pm_topic.id,
notification_level: TopicUser.notification_levels[:regular]
)
# User that has not been seen
user_3 = Fabricate(:user)
pm_topic.allowed_users << user_3
TopicUser.change(user_3.id, pm_topic.id,
notification_level: TopicUser.notification_levels[:tracking]
)
freeze_time 10.minutes.from_now
post = create_post(
user: Fabricate(:admin),
topic_id: pm_topic.id
)
UserStat.ensure_consistency!
expect(user.user_stat.reload.first_unread_pm_at).to eq_time(post.topic.updated_at)
expect(user_2.user_stat.reload.first_unread_pm_at).to_not eq_time(post.topic.updated_at)
expect(user_3.user_stat.reload.first_unread_pm_at).to_not eq_time(post.topic.updated_at)
end
end
describe 'update_time_read!' do