Research CDC as the way to ingest OLTP->Columnstore data stream

MCS cannot handle DML queries rate that OLTP produces via async replication thus MCS needs to compact/batch changes produced by OLTP source. CDC is a widely used approach that can be leveraged to achieve both changes compaction and batching.
The first tool I suggest to try is Debezium that has a number of source plugins, e.g. Oracle. It also has MySQL/MariaDB sink. Unfortunately Debezium is Java project.