You called the unsupported method 'current_database' on ActiveRecord::ConnectionAdapters::MasterSlaveAdapter.
In order to help us improve master_slave_adapter, please report this
to: https://github.com/soundcloud/master_slave_adapter/issues
Thank you.
During migration with LargeHadronMigrator. Call is at lib/large_hadron_migration.rb#L242.
#current_database
is only implemented in mysql adapter and Postgresql adapter, but not in abstract adapter.