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| <div class="section" id="glossary"> |
| <h1>Glossary<a class="headerlink" href="#glossary" title="Permalink to this headline">ΒΆ</a></h1> |
| <blockquote> |
| <div><dl class="simple"> |
| <dt>Cassandra</dt><dd><p>Apache Cassandra is a distributed, high-available, eventually consistent NoSQL open-source database.</p> |
| </dd> |
| <dt>cluster</dt><dd><p>Two or more database instances that exchange messages using the gossip protocol.</p> |
| </dd> |
| <dt>commitlog</dt><dd><p>A file to which the database appends changed data for recovery in the event of a hardware failure.</p> |
| </dd> |
| <dt>datacenter</dt><dd><p>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.</p> |
| </dd> |
| <dt>gossip</dt><dd><p>A peer-to-peer communication protocol for exchanging location and state information between nodes.</p> |
| </dd> |
| <dt>hint</dt><dd><p>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.</p> |
| </dd> |
| <dt>listen address</dt><dd><p>Address or interface to bind to and tell other Cassandra nodes to connect to</p> |
| </dd> |
| <dt>seed node</dt><dd><p>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.</p> |
| </dd> |
| <dt>snitch</dt><dd><p>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.</p> |
| </dd> |
| <dt>SSTable</dt><dd><p>An SSTable provides a persistent,ordered immutable map from keys to values, where both keys and values are arbitrary byte strings.</p> |
| </dd> |
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