Redis 8.8 is now available as open source, introducing a new general-purpose array data structure with dynamic sizing, sparse support, ring buffer semantics, and server-side aggregation. Performance improvements are significant across multiple data types: MGET throughput up to 68%, XREADGROUP up to 83%, sorted set operations up to 74%, and persistence/replication up to 60% faster. New features include a built-in window counter rate limiter via the INCREX command (replacing Lua scripting workarounds), XNACK for explicit stream message rejection with SILENT/FAIL/FATAL modes, subkey notifications for hash field-level events, multiple aggregators in a single time series command, explicit floating-point array type control in JSON (BF16/FP16/FP32/FP64), and a COUNT aggregator for sorted set union/intersection operations.
