1- Hello! This file is just a placeholder, since this is the "unstable" branch
2- of Valkey, the place where all the development happens.
1+ Valkey 8.1 release notes
2+ ========================
3+ --------------------------------------------------------------------------------
4+ Upgrade urgency levels:
5+ LOW: No need to upgrade unless there are new features you want to use.
6+ MODERATE: Program an upgrade of the server, but it's not urgent.
7+ HIGH: There is a critical bug that may affect a subset of users. Upgrade!
8+ CRITICAL: There is a critical bug affecting MOST USERS. Upgrade ASAP.
9+ SECURITY: There are security fixes in the release.
10+ --------------------------------------------------------------------------------
311
4- There is no release notes for this branch, it gets forked into another branch
5- every time there is a partial feature freeze in order to eventually create
6- a new stable release.
712
8- Usually "unstable" is stable enough for you to use it in development environments
9- however you should never use it in production environments. It is possible
10- to download the latest stable release here:
13+ ================================================================================
14+ Valkey 8.1.0 RC1 - Released Thu 11 Feb 2025
15+ ================================================================================
16+ Upgrade urgency LOW: This is the first release candidate of Valkey 8.1, with
17+ performance improvements, extended observability and cluster improvements and different bug fixes.
18+ It includes a new implementation of the Valkey dictionary which is more memory and cache efficient,
19+ better performance for encryption in transit, reduced replication overhead by offloading work to I/O threads,
20+ faster failover support in cluster mode, major improvements to the active defrag process to reduce the impact on command processing,
21+ different API changes for improved usability and ability to track large requests and replies.
22+ Valkey now supports new new check-and-set feature for native STRINGs.
1123
12- https://valkey.io/download/
24+ API and Interface changes
25+ =========================
26+ * Introduce cancel argument to bgsave command (#757)
27+ * Add conditional update support to the `SET` command using `IFEQ` argument (#1324)
28+ * Add more filters to `CLIENT LIST` (#1401)
29+ * Add `availability_zone` to the HELLO response (#1487)
1330
14- More information is available at https://valkey.io
31+ Observability and Monitoring changes
32+ ====================================
33+ * Extend `LATENCY LATEST` to add sum / cnt stats (#1570)
34+ * Add `paused_actions` and `paused_timeout_milliseconds` for `INFO CLIENTS` (#1519)
35+ * Add paused_reason to `INFO CLIENTS` (#1564)
36+ * Added `COMMANDLOG` to record slow executions and large requests/replies (#1294)
37+ * Fix cluster info sent stats for message with light header (#1563)
38+ * Add latency stats around cluster config file operations (#1534)
39+ * Add new flag in `CLIENT LIST` for import-source client (#1398)
40+ * Show client capabilities in `CLIENT LIST` / `CLIENT INFO` (#1698)
1541
16- Happy hacking!
42+ Performance/Efficiency Improvements - Core
43+ ==========================================
44+ * Introduce a new memory efficient hash table to store keys (#1186)
45+ * Accelerate hash table iterator with prefetching (#1501)
46+ * Accelerate hash table iterator with value prefetching (#1568)
47+ * Replace dict with new hashtable: hash datatype (#1502)
48+ * Replace dict with new hashtable for sets datatype (#1176)
49+ * Replace dict with new hashtable: sorted set datatype (#1427)
50+ * Free strings during BGSAVE/BGAOFRW to reduce copy-on-write (#905)
51+ * Create an empty lua table with specified initial capacity as much as possible (#1092)
52+ * Move prepareClientToWrite out of loop for HGETALL command (#1119)
53+ * Improved hashing algorithm for Lua tables (#1168)
54+ * Replace dict with new hashtable for sets datatype (#1176)
55+ * Do security attack check only when command not found to reduce the critical path. (#1212)
56+ * Trim free space from inline command argument strings to avoid excess memory usage (#1213)
57+ * Increase the max number of io threads to 256. (#1220)
58+ * Refactor of ActiveDefrag to reduce latencies (#1242)
59+ * Integrate fast_float to optionally replace strtod (#1260)
60+ * Improvements for TLS with I/O threads (#1271)
61+ * Optimize PFCOUNT, PFMERGE command by SIMD acceleration (#1293)
62+ * Optimize sdscatrepr by batch processing printable characters (#1342)
63+ * Optimize ZRANK to avoid path comparisons (#1389)
64+ * Move clientCron onto a separate timer (#1387)
65+ * Client struct: lazy init components and optimize struct layout (#1405)
66+ * Offload reading the replication stream to IO threads (#1449)
67+ * Skip CRC checksumming during diskless full sync with TLS enabled. (#1479)
68+
69+ New/Modified configurations
70+ ===========================
71+ * Deprecate `io-threads-do-reads`, which has no effect since io threads will now always do reads. (#1138)
72+ * Introduce `import-mode` config to avoid expiration and eviction during data syncing (#1185)
73+ * Introduce new `rdb-version-check` config which allows for relaxed RDB version verification (#1604)
74+ * Deprecate `dynamic-hz`, since server cron jobs are handled dynamically by default (#1387)
75+ * Introduce `log-format` and `log-timestamp-format` to control the log format (#1022)
76+ * Introducing `active-defrag-cycle-us` for more fine-grinned control of memory defragmentation run time (#1242)
77+ * Introduce new configurations to control the new `COMMANDLOG` reporting thresholds (#1294)
78+
79+ Build and Packaging changes
80+ =================================
81+ * Introduce CMake build system for valkey (#1196)
82+ * RDMA builtin support (#1209)
83+ * Fix Valkey binary build workflow, version support changes. (#1429)
84+ * Remove Valkey specific changes in jemalloc source code (#1266)
85+
86+ Module Improvements
87+ ===================
88+ * Add API UpdateRuntimeArgs for updating the module arguments during runtime (#1041)
89+ * Add support for MustObeyClient Module API (#1582)
90+ * Adds support for scripting engines as Valkey modules (#1277, #1497)
91+
92+ Cluster improvements
93+ ====================
94+ * Do election in order based on failed primary rank to avoid voting conflicts (#1018)
95+ * Make replica `CLUSTER RESET` flush async based on `lazyfree-lazy-user-flush` (#1190)
96+ * Trigger the election as soon as possible when doing a forced manual failover (#1067)
97+ * Make manual failover reset the on-going election to promote failover (#1274)
98+ * Brocast a PONG to all node in cluster when role changed (#1295)
99+ * Manual failover vote is not limited by two times the node timeout (#1305)
100+ * Automatic failover vote is not limited by two times the node timeout (#1356)
101+
102+ Behavior Changes
103+ ================
104+ * Streams use an additional 8 bytes to track their internal size (#688)
105+ * Take hz into account in activerehashing to avoid CPU spikes (#977)
106+ * Incr `expired_keys` if the expiration time is already expired (#1517)
107+ * Fix replica not able to initiate election in time when epoch fails (#1009)
108+ * Make `FUNCTION RESTORE FLUSH` flush async based on `lazyfree-lazy-user-flush` (#1254)
109+ * Allow `MEMORY MALLOC-STATS` and `MEMORY PURGE` during loading phase (#1317)
110+ * Use `DEEPBIND` flag when loading external modules in order to avoid symbol conflicts (#1703)
111+
112+
113+ Logging and Tooling Improvements
114+ ================================
115+ * Remove the restriction that cli --cluster create requires at least 3 primary nodes (#1075)
116+ * Add short client info log to CLUSTER MEET / FORGET / RESET commands (#1249)
117+ * Support for reading from replicas in valkey-benchmark (#1392)
118+ * valkey-cli will now re-select previously selected database after reconnect (#1694)
119+ * valkey-cli will now auto-exit from subscribed mode when there are no more active subscriptions (#1432)
120+
121+ Bug Fixes
122+ =========
123+ * Mark the node as FAIL when the node is marked as NOADDR and broadcast the FAIL (#1191)
124+ * [Bug Fix] Optimize RDB Load Performance and Fix Cluster Mode Resizing (#1199)
125+ * Log as primary role (M) instead of child process (C) during startup (#1282)
126+ * Fix empty primary may have dirty slots data due to bad migration (#1285)
127+ * RDMA: Fix dead loop when transfer large data (20KB) (#1386)
128+
129+ We appreciate the efforts of all who contributed code to this release!
130+
131+ Karthik Subbarao (KarthikSubbarao), Xuyang WANG (Nugine), Yury Fridlyand (Yury-Fridlyand), Ben Totten (bentotten), Danish Mehmood (danish-mehmood),
132+ Eran Ifrah (eifrah-aws), gmbnomis, kronwerk, Stefan Mueller (muelstefamzn), Ran Shidlansik (ranshid), secwall, Tal Shachar (talxsha),
133+ Uri Yagelnik (uriyage), Basel Naamna (xbasel), Alan Scherger (flyinprogrammer), Amit Nagler (naglera), Binbin (enjoy-binbin),
134+ Caiyi Wu (Codebells), Guillaume Koenig (knggk), Harkrishn Patro (hpatro), Jacob Murphy (murphyjacob4), Jim Brunner (JimB123), Josef Šimánek (simi),
135+ Jungwoo Song (bluayer), Karthick Ariyaratnam (karthyuom), Lipeng Zhu (lipzhu), Madelyn Olson (madolson), Masahiro Ide (imasahiro), Melroy van den Berg (melroy89),
136+ Mikhail Koviazin (mkmkme), Nadav Gigi (NadavGigi), Nadav Levanoni (nadav-levanoni), Nikhil Manglore (Nikhil-Manglore), Parth Patel (parthpatel), Pierre (pieturin),
137+ Ping Xie (PingXie), Qu Chen (QuChen88), Rain Valentine (SoftlyRaining), Ray Cao (RayaCoo), Ricardo Dias (rjd15372), Romain Geissler (Romain-Geissler-1A),
138+ Roman Gershman (romange), Roshan Khatri (roshkhatri), Rueian (rueian), Sarthak Aggarwal (sarthakaggarwal97), Seungmin Lee (sungming2), Shai Zarka (zarkash-aws),
139+ Shivshankar (Shivshankar-Reddy), Sinkevich Artem (ArtSin), Stav Ben-Tov (stav-bentov), Thalia Archibald (thaliaarchi), Vadym Khoptynets (poiuj),
140+ Viktor Söderqvist (zuiderkwast), Viktor Szépe (szepeviktor), Vu Diep (vudiep411), Wen Hui (hwware), Yanqi Lv (lyq2333), Zvi Schneider (zvi-code),
141+ bodong.ybd (yangbodong22011), chx9 (chx9), otheng (otheng03), skyfirelee (artikell), xingbowang (xingbowang), zhaozhao.zz (soloestoy), zhenwei pi(pizhenwei),
142+ zixuan zhao (azuredream), 烈香 (hengyoush), 风去幽墨 (fengquyoumo)
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