1 files changed, 0 insertions, 77 deletions
diff --git a/lib/gitlab/background_migration/backfill_ci_namespace_mirrors.rb b/lib/gitlab/background_migration/backfill_ci_namespace_mirrors.rb
deleted file mode 100644
index 2247747ba08..00000000000
--- a/lib/gitlab/background_migration/backfill_ci_namespace_mirrors.rb
+++ /dev/null
@@ -1,77 +0,0 @@
-# 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