As per:

https://chatlogs.metabrainz.org/brainzbot/metabrainz/2017-05-30/?msg=3921210&page=1

We should never loop to wait for a service to become available while handling a web request. We're currently doing that for rabbitmq:

https://github.com/metabrainz/listenbrainz-server/pull/180/files#diff-b1948f196a708924f67c401f21fcb3fbR69

This should be fixed and return a 503 error instead. We should also examine the code for other cases of this.