Fix unnecessary queries when batch-removing statuses, 100x faster #15387
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Gargron
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I'm not sure I'm comfortable with that going into 3.3.0 without another RC first, but it looks good to me so far.
I also have made a bunch of inline comments that I believe would further improve performances, but they can reasonably be postponed to another PR, this one seems fine as is.
| # 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) |
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Maybe we could have some middle-ground here and batch some deletes together?
| # Delete multiple statuses and reblogs of them as efficiently as possible | ||
| # @param [Enumerable<Status>] statuses An array of statuses |
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Maybe the comment should be updated to note that some side effects aren't handled by this service and should be taken care of separately, e.g. notifications not being cleaned up.
| @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) } |
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As far as I can see, those are only used once per status, so I am unsure why it's pre-computed.
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| return unless account.local? | ||
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| statuses.each do |status| | ||
| FeedManager.instance.unpush_from_home(account, status) | ||
| end |
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Since it's only ever used in a context where the user gets deleted, I wonder if we could get rid of that completely.
| 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 | ||
| ) |
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I think bookmarks could be in there too (there's Chewy tracking, but the account is gonna be deleted anyway, right?)
| @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]) | ||
| statuses.reject! { |status| reported_status_ids.include?(status.id) } if keep_account_record? | ||
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| BatchedRemoveStatusService.new.call(statuses, skip_side_effects: skip_side_effects?) | ||
| end |
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Wondering if the reported_status_ids shouldn't be a where.not(id: reported_status_ids) instead and the whole thing an in_batches rather than find_in_batches.
Deleting an account speed comparison: