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Hands-on technology leader with 10+ years building scalable, mission-critical systems at Goldman Sachs, Brevan Howard and fast-growing fintechs. Expert in cloud-native architectures, distributed data pipelines and high-throughput systems; experienced in migrating legacy platforms and designing AI-enabled services. Proven track record delivering reliable platforms that process millions of transactions daily.
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Apache Cassandra is a distributed, highly scalable database which organizes data into rows and columns (Somehow like traditional DBs). Each row must have a unique primary key. This key is used to distribute the data to the DB nodes. If you are not familiar with Apache Cassandra please refer to cassandra.apache.org.
I have been a member of Cassandra developer community and I would like to shed some lights on the query execution process from a developer’s perspective.
The query language of Cassandra is called CQL (Cassandra Query Language). Although it is much similar to SQL language, it has a lot of underlying differences. You can use `cqlsh` tool to run CQL commands against a Cassandra system or you can run queries from source code (using one of Cassandra drivers to talk to a Cassandra instance).
When you submit a command from `cqlsh` tool, it is sent to Cassandra over a network connection. On the other side of the connection, a daemon is waiting for commands. It will produce a response for each received commands and send it to the originator. Cassandra uses Netty for its network protocol handling. Netty allows Cassandra to define complex message encoding, decoding and dispatching to handle the communication protocol with its clients.
Here is the general overview of the flow of method calls during processing of a CQL query:
