Is it safe to change RF in this situation?

[Benyi Wang]

* I have a keyspace with RF=2;
* The client read the table using LOCAL_ONE;
* There is a batch job loading data into the tables using ALL.

I want to change RF to 3 and both the client and the batch job use
LOCAL_QUORUM.

My question is "Will the client still read the correct data when the repair
is running at the time my batch job loading is running too?"

Or should I change to LOCAL_QUORUM first?

Thanks.