// Medium attributes constants related to emulation or media type
const ATTR_EMULATION = 1;
const QOS_EMULATION_SQL = 1;
+ // Medium attributes constants related to replica consistency
+ const ATTR_SYNCWRITES = 2; // SYNC_WRITES flag support
+ const QOS_SYNCWRITES_NONE = 1; // replication only supports eventual consistency or less
+ const QOS_SYNCWRITES_BE = 2; // best effort synchronous with limited retries
+ const QOS_SYNCWRITES_QC = 3; // write quorum applied directly to state machines where R+W > N
+ const QOS_SYNCWRITES_SS = 4; // strict-serializable, nodes refuse reads if possible stale
// Generic "unknown" value that is useful for comparisons (e.g. always good enough)
const QOS_UNKNOWN = INF;
}