ActiveRecord::ExclusiveConnectionTimeoutError

Raised when a pool was unable to get ahold of all its connections to perform a “group” action such as {ActiveRecord::Base.connection_pool.disconnect!}[rdoc-ref:ConnectionAdapters::ConnectionPool#disconnect!] or {ActiveRecord::Base.clear_reloadable_connections!}[rdoc-ref:ConnectionAdapters::ConnectionHandler#clear_reloadable_connections!].