forked from fedi/mastodon
100 lines
3.4 KiB
Ruby
100 lines
3.4 KiB
Ruby
# frozen_string_literal: true
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class Scheduler::AccountsStatusesCleanupScheduler
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include Sidekiq::Worker
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include Redisable
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# This limit is mostly to be nice to the fediverse at large and not
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# generate too much traffic.
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# This also helps limiting the running time of the scheduler itself.
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MAX_BUDGET = 50
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# This is an attempt to spread the load across instances, as various
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# accounts are likely to have various followers.
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PER_ACCOUNT_BUDGET = 5
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# This is an attempt to limit the workload generated by status removal
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# jobs to something the particular instance can handle.
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PER_THREAD_BUDGET = 5
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# Those avoid loading an instance that is already under load
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MAX_DEFAULT_SIZE = 2
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MAX_DEFAULT_LATENCY = 5
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MAX_PUSH_SIZE = 5
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MAX_PUSH_LATENCY = 10
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# 'pull' queue has lower priority jobs, and it's unlikely that pushing
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# deletes would cause much issues with this queue if it didn't cause issues
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# with default and push. Yet, do not enqueue deletes if the instance is
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# lagging behind too much.
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MAX_PULL_SIZE = 500
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MAX_PULL_LATENCY = 300
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# This is less of an issue in general, but deleting old statuses is likely
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# to cause delivery errors, and thus increase the number of jobs to be retried.
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# This doesn't directly translate to load, but connection errors and a high
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# number of dead instances may lead to this spiraling out of control if
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# unchecked.
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MAX_RETRY_SIZE = 50_000
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sidekiq_options retry: 0, lock: :until_executed
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def perform
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return if under_load?
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budget = compute_budget
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first_policy_id = last_processed_id
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loop do
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num_processed_accounts = 0
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scope = AccountStatusesCleanupPolicy.where(enabled: true)
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scope.where(Account.arel_table[:id].gt(first_policy_id)) if first_policy_id.present?
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scope.find_each(order: :asc) do |policy|
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num_deleted = AccountStatusesCleanupService.new.call(policy, [budget, PER_ACCOUNT_BUDGET].min)
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num_processed_accounts += 1 unless num_deleted.zero?
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budget -= num_deleted
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if budget.zero?
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save_last_processed_id(policy.id)
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break
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end
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end
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# The idea here is to loop through all policies at least once until the budget is exhausted
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# and start back after the last processed account otherwise
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break if budget.zero? || (num_processed_accounts.zero? && first_policy_id.nil?)
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first_policy_id = nil
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end
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end
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def compute_budget
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threads = Sidekiq::ProcessSet.new.select { |x| x['queues'].include?('push') }.pluck('concurrency').sum
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[PER_THREAD_BUDGET * threads, MAX_BUDGET].min
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end
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def under_load?
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return true if Sidekiq::Stats.new.retry_size > MAX_RETRY_SIZE
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queue_under_load?('default', MAX_DEFAULT_SIZE, MAX_DEFAULT_LATENCY) || queue_under_load?('push', MAX_PUSH_SIZE, MAX_PUSH_LATENCY) || queue_under_load?('pull', MAX_PULL_SIZE, MAX_PULL_LATENCY)
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end
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private
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def queue_under_load?(name, max_size, max_latency)
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queue = Sidekiq::Queue.new(name)
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queue.size > max_size || queue.latency > max_latency
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end
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def last_processed_id
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redis.get('account_statuses_cleanup_scheduler:last_account_id')
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end
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def save_last_processed_id(id)
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if id.nil?
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redis.del('account_statuses_cleanup_scheduler:last_account_id')
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else
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redis.set('account_statuses_cleanup_scheduler:last_account_id', id, ex: 1.hour.seconds)
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end
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end
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end
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