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A seed node doesn’t have any purpose other than bootstrapping a node when it first joins a cluster. SeedsĮvery node in Cassandra configures a list of seeds which is a list of other nodes. Every second, one node performs gossip with up to three other nodes and every gossip message follows specific formats and version numbers to keep the communication efficient. It informs a node about the other nodes’ states. Gossip is a Cassandra protocol its nodes use for peer-to-peer communication. The following concepts are vital for such communication: Gossip Clusters in Cassandra can communicate with each other for numerous functions.
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This peer-to-peer distributed architecture ensures that a single point of failure doesn’t cause the entire system to fail. Every Cassandra node performs all database operations and servers client requests without a master node. It works with peer to peer architecture where each node is connected to every other node. One Cassandra instance is called a node.Ĭassandra offers horizontal scalability where you can add more than one node as a component of a cluster. The simplest version of Cassandra can run on one machine and work well with basic testing. Topology and DesignĬassandra architecture is based on a distributed system architecture. Moreover, you can add a new node to a cluster without interrupting its operations.Īpart from the features, we discussed above, Apache Cassandra architecture also supports multiple data centres and enables data replication across data centres. On the other hand, with Hadoop, the failure of a namenode would fail the entire system.Ĭassandra architecture offers high scalability so a cluster can even have thousands of nodes. This means if a cluster has a hundred nodes and one of them fails, the cluster would still be running. The Cassandra architecture allows the system to function irrespective of a single point of failure. It uses the hash values of the keys to distribute data among the nodes in the cluster. Like HDFS, data in Cassandra gets replicated across the nodes for redundancy and is stored in memory. The architecture allows data to be distributed automatically across all nodes. Instead, it has a ring-like architecture where the nodes are logically distributed in a ring. The Apache Cassandra architecture has no master or slave nodes. Learn More About the Cassandra Architecture.