[esafak]

You can also go HTAP with TiDB which has TiKV for OLTP and TiFlash (Raft-based columnar replicas) for OLAP.

[riku_iki]

I am more interested in actual OLAP than HTAP, and don't see strong OSS OLAP offering on the market right now, my rants in previous discussion: https://news.ycombinator.com/item?id=36992039

But I should look at TiDB, they looks like interesting and relatively mature project.

[esafak]

https://www.starrocks.io/ is on my shortlist for OLAP

[riku_iki]

its also on my list, but it looks like not easy to try, setup procedure is complicated.