year till now 30 million users We use Clickhouse in our daily tasks Chanllenges Complex Datasource Chanllenges Frequent Updates Chanllenges Possible Solutions 1. Replay binlog/oplog CRUD directly Type: mysql, // mysql, mongodb, redis Listen: binlog, // binlog, kafka DataSource: user:pass@tcp(example.com:3306)/user, Table: user, QueryKeys: [ // usually primary