RetryPrepareException is harmless, on the same level as OutdatedTopologyException, so it should be logged at debug level instead of warning.

Tx commands received before the initial topology also result in a NullPointerException that is logged at the error level, because they try to access the transaction table before it finished initializing. Non-TO tx commands avoid this by calling isCommandSentBeforeFirstTopology(commandTopologyId), TO tx commands can do the same.