One may get the following error from maxrows filter in MaxScale 2.1.7 with otherwise usual load:
2017-09-13 14:13:13 error : (46) [maxrows] Received data from the backend although we were expecting nothing.
Relevant parts of configuration file are:
Hint filter is needed to route SELECT .. FOR UPDATE to master. Everything works without problems when MaxRows filter is not involved.
It would be great to document explicitly when this kind of error may happen and, if possible, prevent it.