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RedisRedis/redis

Compact hashes cut memory; new HIMPORT, LMOVEM, BACKUP commands

v8.10-rc1

July 20, 2026redisView original ↗
15 features42 fixesThis release15 featuresNew capabilities42 fixesBug fixesAI-tallied from the release notes
From the original release noteView original ↗

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)

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

Fetched July 20, 2026

Compact hashes cut memory; new HIMPORT, LMOVEM, BACKUP… — releases.sh