std-kafka
std-redis
std-mongo
std-cassandra\

std-etl-machine
std-database-migrator (backfill, .. )

std-cassandra-cdc

k6-http-client-caller
plain-cassandra-inserter

• scene 1: a write op, 3 nodes, 2 nodes logs committed but crash, consistency level is QUORUM) -> include retriable, the write committed logs shouldn't be replayed after 2 nodes recovery.