39 lines
1.3 KiB
Ruby
39 lines
1.3 KiB
Ruby
# frozen_string_literal: true
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# rubocop:disable GitlabSecurity/SqlInjection
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class SchedulePopulateMergeRequestMetricsWithEventsData < ActiveRecord::Migration
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DOWNTIME = false
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BATCH_SIZE = 10_000
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MIGRATION = 'PopulateMergeRequestMetricsWithEventsData'
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disable_ddl_transaction!
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class MergeRequest < ActiveRecord::Base
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self.table_name = 'merge_requests'
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include ::EachBatch
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end
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def up
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say 'Scheduling `PopulateMergeRequestMetricsWithEventsData` jobs'
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# It will update around 4_000_000 records in batches of 10_000 merge
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# requests (running between 10 minutes) and should take around 66 hours to complete.
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# Apparently, production PostgreSQL is able to vacuum 10k-20k dead_tuples by
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# minute, and at maximum, each of these jobs should UPDATE 20k records.
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#
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# More information about the updates in `PopulateMergeRequestMetricsWithEventsData` class.
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#
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MergeRequest.all.each_batch(of: BATCH_SIZE) do |relation, index|
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range = relation.pluck('MIN(id)', 'MAX(id)').first
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BackgroundMigrationWorker.perform_in(index * 10.minutes, MIGRATION, range)
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end
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end
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def down
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execute "update merge_request_metrics set latest_closed_at = null"
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execute "update merge_request_metrics set latest_closed_by_id = null"
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execute "update merge_request_metrics set merged_by_id = null"
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end
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end
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