| .. glossary:: |
| |
| Glossary |
| ======== |
| Cassandra |
| Apache Cassandra is a distributed, high-available, eventually consistent NoSQL open-source database. |
| |
| cluster |
| Two or more database instances that exchange messages using the gossip protocol. |
| |
| commitlog |
| A file to which the database appends changed data for recovery in the event of a hardware failure. |
| |
| datacenter |
| A group of related nodes that are configured together within a cluster for replication and workload segregation purposes. |
| Not necessarily a separate location or physical data center. Datacenter names are case-sensitive and cannot be changed. |
| |
| gossip |
| A peer-to-peer communication protocol for exchanging location and state information between nodes. |
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| hint |
| One of the three ways, in addition to read-repair and full/incremental anti-entropy repair, that Cassandra implements the eventual consistency guarantee that all updates are eventually received by all replicas. |
| |
| listen address |
| Address or interface to bind to and tell other Cassandra nodes to connect to |
| |
| seed node |
| A seed node is used to bootstrap the gossip process for new nodes joining a cluster. To learn the topology of the ring, a joining node contacts one of the nodes in the -seeds list in cassandra. yaml. The first time you bring up a node in a new cluster, only one node is the seed node. |
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| snitch |
| The mapping from the IP addresses of nodes to physical and virtual locations, such as racks and data centers. There are several types of snitches. |
| The type of snitch affects the request routing mechanism. |
| |
| SSTable |
| An SSTable provides a persistent,ordered immutable map from keys to values, where both keys and values are arbitrary byte strings. |
