p) triples called
cells, but conceptually, a Scylla row is a map of column names to values. Those values may be primitives (e.g. strings, integers, booleans, dates), counters, or collections, such as maps, lists, or sets. Collections are internally stored using multiple cells. Rows are grouped into
partitions by a
partition key, and those partitions are assigned via a Dynamo-style hash ring to a subset of nodes in the cluster. Each partition is replicated across multiple nodes for redundancy.
Like Cassandra, Scylla generally allows clients to write to any node at any time even when nodes are crashed or partitioned away. Whether a write is durable depends on whether it reaches a node which can store that row; whether a write is acknowledged to the client depends on whether enough nodes respond to satisfy the client’s requested consistency level. Writes are isolated, Scylla claimed, so long as they take place within a single partition: