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# frozen_string_literal: true
module Gitlab
module Database
module BackgroundMigration
class BatchedMigration < ActiveRecord::Base # rubocop:disable Rails/ApplicationRecord
JOB_CLASS_MODULE = 'Gitlab::BackgroundMigration'
BATCH_CLASS_MODULE = "#{JOB_CLASS_MODULE}::BatchingStrategies"
self.table_name = :batched_background_migrations
has_many :batched_jobs, foreign_key: :batched_background_migration_id
has_one :last_job, -> { order(id: :desc) },
class_name: 'Gitlab::Database::BackgroundMigration::BatchedJob',
foreign_key: :batched_background_migration_id
scope :queue_order, -> { order(id: :asc) }
enum status: {
paused: 0,
active: 1,
aborted: 2,
finished: 3,
failed: 4
}
attribute :pause_ms, :integer, default: 100
def self.active_migration
active.queue_order.first
end
def interval_elapsed?(variance: 0)
return true unless last_job
interval_with_variance = interval - variance
last_job.created_at <= Time.current - interval_with_variance
end
def create_batched_job!(min, max)
batched_jobs.create!(
min_value: min,
max_value: max,
batch_size: batch_size,
sub_batch_size: sub_batch_size,
pause_ms: pause_ms
)
end
def next_min_value
last_job&.max_value&.next || min_value
end
def job_class
"#{JOB_CLASS_MODULE}::#{job_class_name}".constantize
end
def batch_class
"#{BATCH_CLASS_MODULE}::#{batch_class_name}".constantize
end
def job_class_name=(class_name)
write_attribute(:job_class_name, class_name.demodulize)
end
def batch_class_name=(class_name)
write_attribute(:batch_class_name, class_name.demodulize)
end
def migrated_tuple_count
batched_jobs.succeeded.sum(:batch_size)
end
def prometheus_labels
@prometheus_labels ||= {
migration_id: id,
migration_identifier: "%s/%s.%s" % [job_class_name, table_name, column_name]
}
end
def smoothed_time_efficiency(number_of_jobs: 10, alpha: 0.2)
jobs = batched_jobs.successful_in_execution_order.reverse_order.limit(number_of_jobs)
return if jobs.size < number_of_jobs
efficiencies = jobs.map(&:time_efficiency).reject(&:nil?).each_with_index
dividend = efficiencies.reduce(0) do |total, (job_eff, i)|
total + job_eff * (1 - alpha)**i
end
divisor = efficiencies.reduce(0) do |total, (job_eff, i)|
total + (1 - alpha)**i
end
return if divisor == 0
(dividend / divisor).round(2)
end
def optimize!
BatchOptimizer.new(self).optimize!
end
end
end
end
end
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