77 lines
2.6 KiB
Ruby
77 lines
2.6 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module BackgroundMigration
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# A job to set namespaces.traversal_ids in sub-batches, of all namespaces with
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# a parent and not already set.
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# rubocop:disable Style/Documentation
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class BackfillNamespaceTraversalIdsChildren
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class Namespace < ActiveRecord::Base
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include ::EachBatch
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self.table_name = 'namespaces'
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scope :base_query, -> { where.not(parent_id: nil) }
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end
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PAUSE_SECONDS = 0.1
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def perform(start_id, end_id, sub_batch_size)
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batch_query = Namespace.base_query.where(id: start_id..end_id)
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batch_query.each_batch(of: sub_batch_size) do |sub_batch|
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first, last = sub_batch.pluck(Arel.sql('min(id), max(id)')).first
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ranged_query = Namespace.unscoped.base_query.where(id: first..last)
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update_sql = <<~SQL
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UPDATE namespaces
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SET traversal_ids = calculated_ids.traversal_ids
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FROM #{calculated_traversal_ids(ranged_query)} calculated_ids
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WHERE namespaces.id = calculated_ids.id
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AND namespaces.traversal_ids = '{}'
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SQL
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ApplicationRecord.connection.execute(update_sql)
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sleep PAUSE_SECONDS
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end
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# We have to add all arguments when marking a job as succeeded as they
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# are all used to track the job by `queue_background_migration_jobs_by_range_at_intervals`
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mark_job_as_succeeded(start_id, end_id, sub_batch_size)
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end
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private
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# Calculate the ancestor path for a given set of namespaces.
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def calculated_traversal_ids(batch)
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<<~SQL
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(
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WITH RECURSIVE cte(source_id, namespace_id, parent_id, height) AS (
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(
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SELECT batch.id, batch.id, batch.parent_id, 1
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FROM (#{batch.to_sql}) AS batch
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)
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UNION ALL
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(
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SELECT cte.source_id, n.id, n.parent_id, cte.height+1
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FROM namespaces n, cte
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WHERE n.id = cte.parent_id
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)
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)
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SELECT flat_hierarchy.source_id as id,
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array_agg(flat_hierarchy.namespace_id ORDER BY flat_hierarchy.height DESC) as traversal_ids
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FROM (SELECT * FROM cte FOR UPDATE) flat_hierarchy
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GROUP BY flat_hierarchy.source_id
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)
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SQL
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end
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def mark_job_as_succeeded(*arguments)
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Gitlab::Database::BackgroundMigrationJob.mark_all_as_succeeded(
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'BackfillNamespaceTraversalIdsChildren',
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arguments
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)
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end
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end
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end
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end
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