1 files changed, 38 insertions, 0 deletions
diff --git a/db/migrate/20201201192112_add_primary_key_to_elastic_search_indexed_namespaces.rb b/db/migrate/20201201192112_add_primary_key_to_elastic_search_indexed_namespaces.rb
new file mode 100644
index 00000000000..610cd2828ca
--- /dev/null
+++ b/db/migrate/20201201192112_add_primary_key_to_elastic_search_indexed_namespaces.rb
@@ -0,0 +1,38 @@
+# frozen_string_literal: true
+
+class AddPrimaryKeyToElasticSearchIndexedNamespaces < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  UNIQUE_INDEX_NAME = 'index_elasticsearch_indexed_namespaces_on_namespace_id'
+  PRIMARY_KEY_NAME = 'elasticsearch_indexed_namespaces_pkey'
+
+  disable_ddl_transaction!
+
+  def up
+    with_lock_retries do
+      execute(<<~SQL)
+        LOCK TABLE elasticsearch_indexed_namespaces IN ACCESS EXCLUSIVE MODE;
+
+        DELETE FROM elasticsearch_indexed_namespaces
+        WHERE namespace_id IS NULL;
+
+        ALTER TABLE elasticsearch_indexed_namespaces
+        ADD CONSTRAINT #{PRIMARY_KEY_NAME} PRIMARY KEY USING INDEX #{UNIQUE_INDEX_NAME};
+      SQL
+    end
+  end
+
+  def down
+    add_concurrent_index :elasticsearch_indexed_namespaces, :namespace_id, unique: true, name: UNIQUE_INDEX_NAME
+
+    with_lock_retries do
+      execute(<<~SQL)
+        ALTER TABLE elasticsearch_indexed_namespaces
+        DROP CONSTRAINT #{PRIMARY_KEY_NAME},
+        ALTER COLUMN namespace_id DROP NOT NULL
+      SQL
+    end
+  end
+end