By cluster support I mean:

- ability to use ReplicatedMergeTree in the table schema

- round-robin writing to multiple nodes

It is mostly a matter of providing configuration options. Thought I could skip it in the first release.

>How are you handling persistent storage?

If you mean avoiding data loss by using ClickHouse cluster, then yes - we use CH cluster and replication :)

ClickHouse handles data corruption surprisingly good - even if there are broken parts CH continues to serve the rest of data.