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/redis/redis/8.10-rc1
8.10-rc1
8.10-RC1
View on GitHubView PackagePublished: Jul 20, 2026

Release Notes

This is the first Release Candidate of Redis 8.10 in Redis Open Source.

Release Candidates are feature-complete pre-releases. Pre-releases are not suitable for production use.

Headlines:

Redis 8.10 introduces new features and performance improvements.

Operating systems we test Redis 8.10 on

  • Ubuntu 22.04 (Jammy Jellyfish), 24.04 (Noble Numbat), 26.04 (Resolute Raccoon)
  • Rocky Linux 8.10, 9.7, 10.1
  • AlmaLinux 8.10, 9.7, 10.1
  • Debian 12.13 (Bookworm), Debian 13.4 (Trixie)
  • Alpine 3.23
  • macOS 14.8.4 (Sonoma), 15.7.4 (Sequoia), 26.3 (Tahoe) - for both Intel and ARM

New Features (compared to 8.8)

  • #15364 Compact hashes - a new hash encoding that reduces memory usage by storing hash field names just once for keys that share a schema
  • #15364 New command: HIMPORT - high-throughput compact hash bulk insertion
  • #15405 New commands: LMOVEM, BLMOVEM - move multiple elements between lists
  • #14893 New command: SUNIONCARD - get the cardinality of the union of multiple sets
  • #15278 New command: SDIFFCARD - get the cardinality of the difference between sets
  • #15441 New command: BACKUP - node-side implementation for backup and restore based on multi-part AOF (MP-AOF)
  • #15282 XREAD, XREADGROUP - new MAXCOUNT and MAXSIZE arguments to cap the cumulative reply entries and size
  • #15337 New SCRIPT_RUNNER command flag: flag commands that execute scripts or functions
  • #15347 SLOWLOG GET - new reply argument: total argument count
  • RediSearch/RediSearch#9626 New command: FT.ALIASLIST - get all aliases for the index (RED-197340)
  • RediSearch/RediSearch#9052 Stemmer support for Malay and Tagalog languages (RED-132425)
  • RediSearch/RediSearch#9291 FT.AGGREGATE - new COLLECT reducer: separate remote and local reducer invocations (RED-177887)
  • RediSearch/RediSearch#8169, RediSearch/RediSearch#8236, RediSearch/RediSearch#9234, RediSearch/RediSearch#9443 — FT.SEARCH, FT.AGGREGATE, FT.HYBRID: enforce query TIMEOUT more strictly
    • The search-on-timeout policy now offers three options:
      • FAIL — reject timed-out queries. With search-workers > 0` (the default), the timeout is enforced preemptively
      • RETURN (default) — return best-effort partial results, without enforcing strictness during post-processing
      • RETURN_STRICT (new) — return best-effort partial results while enforcing the timeout through the post-processing (result) pipeline
    • Queries executed on the main thread (i.e., when search-workers is 0) are capped by search-_max-foreground-timeout-limit
  • RedisJSON/RedisJSON#1602, RedisJSON/RedisJSON#1603, RedisJSON/RedisJSON#1604, RedisJSON/RedisJSON#1607, RedisJSON/RedisJSON#1618 JSONPath extensions (MOD-16274, MOD-16275):
    • Projection expressions at the top level of a JSONPath query
    • == and != can now compare any literal, including array and object literals
    • Filter negation operator: !
    • size/sizeof and empty operators on string, array, object, and nodelist
    • in and nin operators: membership test on an array and nodelist
    • Operators on numbers: binary -, +, *, /, %, and unary - and +
    • Operator on object: ~
    • length() function on array, object, and string
    • Functions on number: abs(), ceiling(), floor()
    • Functions on string: match(), search()
    • Strings concatenation with concat()
    • Functions on array: first(), last(), index(), append()
    • Aggregation functions on array: min(), max(), avg(), sum(), stddev()
    • Function on object: keys()
    • Function on nodelist: count()
    • Function on nodelist with exactly one node: value()
    • Relations functions on array and nodelist: subsetof(), anyof(), noneof()
  • RedisTimeSeries/RedisTimeSeries#2052 New commands: TS.NRANGE, TS.NREVRANGE - Query a range across multiple time series; group results by timestamp (RED-149232)
  • RedisTimeSeries/RedisTimeSeries#2054 New command: TS.READ - optionally blocking read (RED-132421)
  • RedisTimeSeries/RedisTimeSeries#2090 New command: TS.QUERYLABELS - Get a list of labels and label-values (RED-132355)
  • RedisTimeSeries/RedisTimeSeries#2072 New command: TS.MRANGE, TS.MREVRANGE - new EXCLUDEEMPTY argument to exclude series with no reported samples (RED-132536)

Bug fixes (compared to 8.8.0)

  • #15478 SORT, GEORADIUS, GEORADIUSBYMEMBER, XREAD, XREADGROUP - ACL permission bypass
  • #15329, #15467 - I/O thread busy looping for replica clients
  • #15466 Duplicate KeyMeta restoration in RESTORE-based AOF rewrites
  • #15462 MEMORY USAGE over-reports memory consumption
  • #15447 Full sync under heavy write load
  • #15412 Unit mismatch disables the FAST expire cycle stale trigger
  • #15392 Crash on VRANDMEMBER with LLONG_MIN count
  • #15409 CONFIG SET - crash on of TLS options in non-TLS builds
  • #15371 ACL key-name leak in BCAST client-side caching invalidations
  • #15433 Signed overflow in BITFIELD offset parsing
  • #15446 The select-based event loop backend enqueues registered file descriptors that select() did not mark ready
  • #15309 mem_clients_normal drift when a replica drops its cached master after a failed partial resync
  • #15357 Crash on missing module numeric config
  • #15377 In-progress atomic slot migration tasks keep running on RM_ResetDataset and RM_RdbLoad
  • #15391, #15356, #15436 NULL dereference
  • #15390 Overflow on memory unit conversions
  • #15291 SET does not enforce mutually exclusive NX/XX and IF* options
  • #15322 CONFIG SET does not reject duplicate arguments when using both primary name and alias
  • #15407 LSET out-of-range 64-bit index truncation
  • #15308 Improve RDB load robustness (streams)
  • #15263 Tighter cluster bus parsing for PING, PONG, and MEET packets
  • #15247 Partial crash log on LoongArch architecture
  • #15270 VADD ... CAS SETATTR - wrong attributes count
  • RediSearch/RediSearch#10375 FT.CURSOR READ: crash after the underlying index was dropped (MOD-16703)
  • RediSearch/RediSearch#10408 FT.SEARCH with LIMIT returns too many results in cluster mode over RESP3 (MOD-16767)
  • RediSearch/RediSearch#10420 [FT.INFO](http://ft.info/) could report incorrect values for multi-value TAG fields after document updates (MOD-16745)
  • RediSearch/RediSearch#10488 FT.INFO reports a negative num_records after garbage collection on indexes with an INDEXMISSING field (MOD-16940)
  • RediSearch/RediSearch#10392 Vector search: crash (SIGSEGV) in FP32/L2 distance computation on x86 without AVX support, affecting certain vector dimensions (MOD-16730)
  • RediSearch/RediSearch#9963 Range query returns incomplete results when the lower bound is an excluded empty string (MOD-15897)
  • RediSearch/RediSearch#10066 FT.AGGREGATE .. WITHCOUNT coordinator leaks resources on timeout (MOD-16210)
  • RediSearch/RediSearch#10247 Local FT.HYBRID ignores ON_TIMEOUT RETURN_STRICT and continues execution past the deadline (MOD-16492)
  • RediSearch/RediSearch#10255 Blocked search clients trigger unnecessary query dumps, adding CPU and log overhead (MOD-16518)
  • RediSearch/RediSearch#10151 FT.HYBRID supports EXPLAINSCORE, exposing the fusion method (RRF or LINEAR) (MOD-10044)
  • RedisJSON/RedisJSON#1542, RedisJSON/RedisJSON#1543 Wrong results when evaluating paths with recursive descent (MOD-6722, MOD-14664)
  • RedisJSON/RedisJSON#1554 Any literal that starts with true/false/null is interpreted as true/false/null (MOD-7266)
  • RedisJSON/RedisJSON#1600 Improve RDB load robustness
  • RedisTimeSeries/RedisTimeSeries#2067 TS.INFO - inaccurate memory usage calculation (MOD-6409)
  • RedisTimeSeries/RedisTimeSeries#2036, RedisTimeSeries/RedisTimeSeries#2053, RedisTimeSeries/RedisTimeSeries#2056, #2074 Aggregation fixes (MOD-8187, MOD-16224, MOD-15565)
  • RedisTimeSeries/RedisTimeSeries#2004, RedisTimeSeries/RedisTimeSeries#2051 Improve RDB load robustness
  • RedisTimeSeries/RedisTimeSeries#2104 Issues after cluster topology changes
  • RedisTimeSeries/RedisTimeSeries#2122 Error on the first cross-shard command (TLS)
  • RedisTimeSeries/RedisTimeSeries#2109 TS.INCRBY with TIMESTAMP * replication timestamp drift
  • RedisBloom/RedisBloom#1014 CF.LOADCHUNK partial replication (MOD-16050)
  • RedisBloom/RedisBloom#1026, RedisBloom/RedisBloom#1027 Improve RDB load robustness

Performance and resource utilization improvements (compared to 8.8.0)

  • #15376 Optimize lpSeek() by validating entries only when necessary
  • #15345 Optimize wide HSET/HMSET on a fresh hash with a single batched listpack append
  • #15330 Avoid recomputing allocator fragmentation twice per cron tick (RED-200844)
  • #15259 Trim excess SDS allocation in inline command parsing
  • #15256 rax memory reduction: leaf-inlining for fixed-length-key trees - improves XREADGROUP performance
  • #15397 Improve RESTORE REPLACE performance for new keys
  • #14704 Optimizes an internal memory accounting
  • RediSearch/RediSearch#10246 Write operations block on a read lock held throughout vector range query result collection (MOD-16437)
  • RediSearch/RediSearch#10392 Vector search: Reduce HNSW index memory usage with one-byte per-node locks (MOD-16696).
  • RedisJSON/RedisJSON#1617 JSON - memory object footprint improvements (MOD-16608)

Modules API

  • #15350 RedisModuleEvent_ClusterTopologyChange - cluster topology change
  • #15327 REDISMODULE_SUBEVENT_FORK_CHILD_* - allow multi-threaded modules can quiesce background work before fork()
  • #15373 REDISMODULE_SUBEVENT_CLUSTER_SLOT_MIGRATION_MIGRATE_MODULE_PROPAGATE_END - inject commands after ASM replication stream
  • #15242 RedisModule_AddPostNotificationJobForKey - binds deferred work to a specific key from a keyspace-notification handler

Configuration parameters

  • #15364 Compact hashes:
    • hash-rdb-load-min-template-entries - minimum field count to convert a plain hash to a template during load
    • hash-rdb-load-max-template-entries - maximum field count for load-time conversion
    • hash-rdb-load-template-disassembly-threshold - minimum number of keys a converted template must end up with to be kept

Metrics

  • #15364 Compact hashes:
    • INFO STATS - hash_templates - number of distinct compact hash templates
    • INFO STATS - hash_template_keys - total number of keys backed by a compact hash template
    • INFO MEMORY - used_memory_hash_templates - total memory used by all compact hash templates
    • MEMORY STATS - hash.templates - total memory used by all compact hash templates
    • MEMORY USAGE <key> reports the key’s own + plus its share of a compact hash template cost

CLI tools

  • #15352 Adds --latency-percentiles <p1,p2,...> to --latency / --latency-history: reporting user-chosen percentiles
  • #15262 redis-cli --cluster rebalance - CROSSSLOT error on when using -user without -a
  • #15338 redis-cli --cluster reshard and rebalance now move slots with server-side atomic slot migration