ThreadClient is an RAII type that manages a client's lifecycle by instantiating a client on the current thread on construction (through Client::initThread()) and resetting the thread's client on destruction. Instantiating a client will set the thread's name, but ThreadClient does not restore the original thread name, if any, on destruction. This means when ThreadClients are used by threads in a pool, like worked scheduled by a transaction two phase commit coordinator, those threads will have their original names permanently overwritten, leading to misleading log messages when they're later used.