Having long-running connections to all hosts are a huge issue for availability, and prevents me from depooling servers for regular maintenance. In particular, wikiadmin user is the most problematic as it is not checked for used resources (maximum duration of queries, connections, etc.)
These threads do /* FetchText::doGetText */ and then idle for seconds, with all the issues that can create.
If dump hosts are too slow, please say so and we can check options (specially now that we have new servers), but creating random connections to any host is a problem. Let's see why this is happening and propose a proper solution:
If these create light-weight queries only, lets disconnect and connect after some amount of seconds. If dump hosts are too slow, let's give them better resources. If there is a problem with the connection framework, let'x fix it with the addition of a proxy/persistent connections manager.