Clickhouse cluster can run without Zookeeper and without replication. Data durability may be provided by using durable storage such as Google Compute Engine disks [1].

Data ingestion process may be accelerated without resorting to Kafka - just insert data into Buffer table [2].

[1] https://cloud.google.com/compute/docs/disks/#pdspecs

[2] https://clickhouse.yandex/docs/en/operations/table_engines/b...