Currently errors in persistenceId naming lead to nasty internal clashes which get reported through error messages like
Invalid replayed event [1] in buffer from old writer

Since this is an api user error rather than a core akka error, the error should be more obvious or helpful, suggest inclusion of text "possible persistenceId name duplication" in the error text.

Also maybe some paragraph on trouble-shooting in the akka docs. One problem is this error can manifest in different ways but at the time of creating two persistors with conflicting ids you get no warning.

A better solution would be to detect the problem when the it first arises - i.e. first time two active persistors use the same id - but I've no idea whether this is practical