Few days with Apache Cassandra

Few years ago I was a product developer at a big software (but non-database) company. We were writing the v2 of a new product after a fairly successful development round of v1. For everything OLTP, we used the wonderful open-source database - Postgres. But by v2, we had new, hight-volume data like NetFlow coming in. This would have intensely tested Postgres's scalability and read/write performance. And we had some datawarehousing and OLAP requirements too. A hard look at our queries told us that column-stores would be a great-fit. Looking back, the options for a new product to store and query on massive data volumes boiled down to these few options -

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