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Improve account index migration (#7684)

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* Improve account index migration

- Display more progress in stdout
- Catch PG::UniqueViolation when re-attributing favourites
- Skip callbacks and validations when re-attributing other relationships

* Use in_batches to reduce table lock-up during account merge

* Use #say_with_time to benchmark each deduplication
This commit is contained in:
Eugen Rochko 2018-05-31 17:09:09 +02:00 committed by GitHub
parent 1e938b966e
commit 19b4c666f7
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1 changed files with 22 additions and 20 deletions
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db/migrate/20180528141303_fix_accounts_unique_index.rb
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@ -39,26 +39,28 @@ class FixAccountsUniqueIndex < ActiveRecord::Migration[5.2]
accounts = accounts.first.local? ? accounts.sort_by(&:created_at) : accounts.sort_by(&:updated_at).reverse
reference_account = accounts.shift
accounts.each do |other_account|
if other_account.public_key == reference_account.public_key
# The accounts definitely point to the same resource, so
# it's safe to re-attribute content and relationships
merge_accounts!(reference_account, other_account)
elsif other_account.local?
# Since domain is in the GROUP BY clause, both accounts
# are always either going to be local or not local, so only
# one check is needed. Since we cannot support two users with
# the same username locally, one has to go. 😢
other_account.user&.destroy
end
say_with_time "Deduplicating @#{reference_account.acct} (#{accounts.size} duplicates)..." do
accounts.each do |other_account|
if other_account.public_key == reference_account.public_key
# The accounts definitely point to the same resource, so
# it's safe to re-attribute content and relationships
merge_accounts!(reference_account, other_account)
elsif other_account.local?
# Since domain is in the GROUP BY clause, both accounts
# are always either going to be local or not local, so only
# one check is needed. Since we cannot support two users with
# the same username locally, one has to go. 😢
other_account.user&.destroy
end
other_account.destroy
other_account.destroy
end
end
end
def merge_accounts!(main_account, duplicate_account)
[Status, Favourite, Mention, StatusPin, StreamEntry].each do |klass|
klass.where(account_id: duplicate_account.id).update_all(account_id: main_account.id)
[Status, Mention, StatusPin, StreamEntry].each do |klass|
klass.where(account_id: duplicate_account.id).in_batches.update_all(account_id: main_account.id)
end
# Since it's the same remote resource, the remote resource likely
@ -67,19 +69,19 @@ class FixAccountsUniqueIndex < ActiveRecord::Migration[5.2]
# of the index bug users could have *also* followed the reference
# account already, therefore mass update will not work and we need
# to check for (and skip past) uniqueness errors
[Follow, FollowRequest, Block, Mute].each do |klass|
[Favourite, Follow, FollowRequest, Block, Mute].each do |klass|
klass.where(account_id: duplicate_account.id).find_each do |record|
begin
record.update(account_id: main_account.id)
rescue ActiveRecord::RecordNotUnique
record.update_attribute(:account_id, main_account.id)
rescue PG::UniqueViolation
next
end
end
klass.where(target_account_id: duplicate_account.id).find_each do |record|
begin
record.update(target_account_id: main_account.id)
rescue ActiveRecord::RecordNotUnique
record.update_attribute(:target_account_id, main_account.id)
rescue PG::UniqueViolation
next
end
end