There have been periodic complaints about lustre not really knowing when it was evicted from a server node, as this could only be known in case an RPC is sent.
Frequently this would be handled by a periodic ping, but with this functionality being turned down to happen in rarer cases, it more and more converts into the case of an app initiating an RPC and being evicted all of a sudden due to an eviction that has happened quite a while ago.

As such we probably need a somewhat better way of notifying clients of their eviction so that they can reconnect somewhat more eagerly and with a bit less damage to whatever it is that might be running in userspace.