Currently the switchdc cookbooks via spicerack ignore active/active dbs (parsercache, x2). It would be a good improvement if it verified that active/active dbs are read-write in both DCs. Or at the very least verify it's read-write in the new primary DC.
Suggested by @RLazarus in https://gerrit.wikimedia.org/r/c/operations/software/spicerack/+/701474/5/spicerack/mysql_legacy.py#253