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# frozen_string_literal: true
module Gitlab
module BackgroundMigration
# A job to create ci_namespace_mirrors entries in batches
class BackfillCiNamespaceMirrors
class Namespace < ActiveRecord::Base # rubocop:disable Style/Documentation
include ::EachBatch
self.table_name = 'namespaces'
self.inheritance_column = nil
scope :base_query, -> do
select(:id, :parent_id)
end
end
PAUSE_SECONDS = 0.1
SUB_BATCH_SIZE = 500
def perform(start_id, end_id)
batch_query = Namespace.base_query.where(id: start_id..end_id)
batch_query.each_batch(of: SUB_BATCH_SIZE) do |sub_batch|
first, last = sub_batch.pluck(Arel.sql('MIN(id), MAX(id)')).first
ranged_query = Namespace.unscoped.base_query.where(id: first..last)
update_sql = <<~SQL
INSERT INTO ci_namespace_mirrors (namespace_id, traversal_ids)
#{insert_values(ranged_query)}
ON CONFLICT (namespace_id) DO NOTHING
SQL
# We do nothing on conflict because we consider they were already filled.
Namespace.connection.execute(update_sql)
sleep PAUSE_SECONDS
end
mark_job_as_succeeded(start_id, end_id)
end
private
def insert_values(batch)
calculated_traversal_ids(
batch.allow_cross_joins_across_databases(url: 'https://gitlab.com/gitlab-org/gitlab/-/issues/336433')
)
end
# Copied from lib/gitlab/background_migration/backfill_namespace_traversal_ids_children.rb
def calculated_traversal_ids(batch)
<<~SQL
WITH RECURSIVE cte(source_id, namespace_id, parent_id, height) AS (
(
SELECT batch.id, batch.id, batch.parent_id, 1
FROM (#{batch.to_sql}) AS batch
)
UNION ALL
(
SELECT cte.source_id, n.id, n.parent_id, cte.height+1
FROM namespaces n, cte
WHERE n.id = cte.parent_id
)
)
SELECT flat_hierarchy.source_id as namespace_id,
array_agg(flat_hierarchy.namespace_id ORDER BY flat_hierarchy.height DESC) as traversal_ids
FROM (SELECT * FROM cte FOR UPDATE) flat_hierarchy
GROUP BY flat_hierarchy.source_id
SQL
end
def mark_job_as_succeeded(*arguments)
Gitlab::Database::BackgroundMigrationJob.mark_all_as_succeeded('BackfillCiNamespaceMirrors', arguments)
end
end
end
end
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