It's not the data authority. It feeds in data from Kafka and structures it in an optimized way for querying. If a node dies then it can copy from another node a

It's not the data authority. It feeds in data from Kafka and structures it in an optimized way for querying. If a node dies then it can copy from another node and restart from an offset in Kafka. Kafka essentially works as a distributed write-ahead log (WAL).