Redis 7.4 RC2 (#13371)

Upgrade urgency LOW: This is the second Release Candidate for Redis 7.4.

Performance and resource utilization improvements
=================================================
* #13296 Optimize CPU cache efficiency

Changes to new 7.4 new features (compared to 7.4 RC1)
=====================================================
* #13343 Hash - expiration of individual fields: when key does not exist
- reply with an array (nonexisting code for each field)
* #13329 Hash - expiration of individual fields: new keyspace event:
`hexpired`

Modules API - Potentially breaking changes to new 7.4 features (compared
to 7.4 RC1)

====================================================================================
* #13326 Hash - expiration of individual fields: avoid lazy expire when
called from a Modules API function

00-RELEASENOTES

@@ -1,16 +1,140 @@
-Hello! This file is just a placeholder, since this is the "unstable" branch
-of Redis, the place where all the development happens.
+Redis 7.4 release notes
+=======================
 
-There is no release notes for this branch, it gets forked into another branch
-every time there is a partial feature freeze in order to eventually create
-a new stable release.
+--------------------------------------------------------------------------------
+Upgrade urgency levels:
 
-Usually "unstable" is stable enough for you to use it in development environments
-however you should never use it in production environments. It is possible
-to download the latest stable release here:
+LOW:      No need to upgrade unless there are new features you want to use.
+MODERATE: Program an upgrade of the server, but it's not urgent.
+HIGH:     There is a critical bug that may affect a subset of users. Upgrade!
+CRITICAL: There is a critical bug affecting MOST USERS. Upgrade ASAP.
+SECURITY: There are security fixes in the release.
+--------------------------------------------------------------------------------
 
-    https://download.redis.io/redis-stable.tar.gz
 
-More information is available at https://redis.io
+================================================================================
+Redis 7.4 RC2   Released Thu 27 Jun 2024 10:00:00 IST
+================================================================================
+
+Upgrade urgency LOW: This is the second Release Candidate for Redis 7.4.
+
+Performance and resource utilization improvements
+=================================================
+* #13296 Optimize CPU cache efficiency
+
+Changes to new 7.4 new features (compared to 7.4 RC1)
+=====================================================
+* #13343 Hash - expiration of individual fields: when key does not exist - reply with an array (nonexisting code for each field)
+* #13329 Hash - expiration of individual fields: new keyspace event: `hexpired`
+
+Modules API - Potentially breaking changes to new 7.4 features (compared to 7.4 RC1)
+====================================================================================
+* #13326 Hash - expiration of individual fields: avoid lazy expire when called from a Modules API function
+
+
+================================================================================
+Redis 7.4 RC1   Released Thu 6 Jun 2024 10:00:00 IST
+================================================================================
+
+Note: License changed - see LICENSE.txt
+
+Upgrade urgency LOW: This is the first Release Candidate for Redis 7.4.
+
+Here is a comprehensive list of changes in this release compared to 7.2.5.
+
+New Features
+============
+* #13303 Hash - expiration of individual fields. 9 commands were introduced:
+  - `HEXPIRE` and `HPEXPIRE` set the remaining time to live for specific fields
+  - `HEXPIREAT` and `HPEXPIREAT` set the expiration time to a UNIX timestamp for specific fields
+  - `HPERSIST` removes the expiration for specific fields
+  - `HEXPIRETIME` and `HPEXPIRETIME` get the expiration time for specific fields
+  - `HTTL` and `HPTTL` get the remaining time to live for specific fields
+* #13117 `XREAD`: new id value `+` to start reading from the last message
+* #12765 `HSCAN`: new [NOVALUES] flag to report only field names
+* #12728 `SORT`, `SORT_RO`: allow `BY` and `GET` options in cluster mode when the pattern maps to the same slot as the key
+* #12299 `CLIENT KILL`: new optional filter: `MAXAGE maxage` - retain connections older than `maxage` seconds
+* #12971 Lua: expose `os.clock()` API for getting the elapsed time of Lua code execution
+* #13276 Allow `SPUBLISH` command within `MULTI ... EXEC` transactions on replica
+
+Bug fixes
+=========
+* #12898 `XREADGROUP`: fix entries-read inconsistency between master and replicas
+* #13042 `SORT ... STORE`: fix created lists to respect list compression and packing configs
+* #12817, #12905 Fix race condition issues between the main thread and module threads
+* #12577 Unsubscribe all clients from replica for shard channel if the master ownership changes
+* #12622 `WAITAOF` could timeout or hang if used after a module command that propagated effects only to replicas and not to AOF
+* #11734 `BITCOUNT` and `BITPOS` with nonexistent key and illegal arguments return an error, not 0
+* #12394 `BITCOUNT`: check for wrong argument before checking if key exists
+* #12961 Allow execution of read-only transactions when out of memory
+* #13274 Fix crash when a client performs ACL change that disconnects itself
+* #13311 Cluster: Fix crash due to unblocking client during slot migration
+
+Security improvements
+=====================
+* #13108 Lua: LRU eviction for scripts generated with `EVAL` *** BEHAVIOR CHANGE ***
+* #12961 Restrict the total request size of `MULTI ... EXEC` transactions
+* #12860 Redact ACL username information and mark '*-key-file-pass configs' as sensitive
+
+Performance and resource utilization improvements
+=================================================
+* #12838 Improve performance when many clients call `PUNSUBSCRIBE` / `SUNSUBSCRIBE` simultaneously
+* #12627 Reduce lag when waking `WAITAOF` clients and there is not much traffic
+* #12754 Optimize `KEYS` when pattern includes hashtag and implies a single slot
+* #11695 Reduce memory and improve performance by replacing cluster metadata with slot specific dictionaries
+* #13087 `SCRIPT FLUSH ASYNC` now does not block the main thread
+* #12996 Active memory defragmentation efficiency improvements
+* #12899 Improve performance of read/update operation during rehashing
+* #12536 `SCAN ... MATCH`: Improve performance when the pattern implies cluster slot
+* #12450 `ZRANGE ... LIMIT`: improved performance
+
+Other general improvements
+==========================
+* #13133 Lua: allocate VM code with jemalloc instead of libc and count it as used memory *** BEHAVIOR CHANGE ***
+* #12171 `ACL LOAD`: do not disconnect all clients *** BEHAVIOR CHANGE ***
+* #13020 Allow adjusting defrag configurations while active defragmentation is running
+* #12949 Increase the accuracy of avg_ttl (the average keyspace keys TTL)
+* #12977 Allow running `WAITAOF` in scripts
+* #12782 Implement TCP keep-alive across most Unix-like systems
+* #12707 Improved error codes when rejecting scripts in cluster mode
+* #12596 Support `XREAD ... BLOCK` in scripts; rejected only if it ends up blocking
+
+New metrics
+===========
+* #12849 `INFO`: `pubsub_clients` - number of clients in Pub/Sub mode
+* #12966 `INFO`: `watching_clients` - number of clients that are watching keys
+* #12966 `INFO`: `total_watched_keys` - number of watched keys
+* #12476 `INFO`: `client_query_buffer_limit_disconnections` - count client input buffer OOM events
+* #12476 `INFO`: `client_output_buffer_limit_disconnections` - count client output buffer OOM events
+* #12996 `INFO`: `allocator_muzzy` - memory returned to the OS but still shows as RSS until the OS reclaims it
+* #13108 `INFO`: `evicted_scripts` - number of evicted eval scripts. Users can check it to see if they are abusing EVAL
+* #12996 `MEMORY STATS`: `allocator.muzzy` - memory returned to the OS but still shows as RSS until the OS reclaims it
+* #12913 `INFO MEMORY` `mem_overhead_db_hashtable_rehashing` - memory resharding overhead (only the memory that will be released soon)
+* #12913 `MEMORY STATS': `overhead.db.hashtable.lut` - total overhead of dictionary buckets in databases
+* #12913 `MEMORY STATS': `overhead.db.hashtable.rehashing` - temporary memory overhead of database dictionaries currently being rehashed 
+* #12913 `MEMORY STATS': `db.dict.rehashing.count` - number of top level dictionaries currently being rehashed
+* #12966 `CLIENT LIST`: `watch` - number of keys each client is currently watching
+
+Modules API
+===========
+* #12985 New API calls: `RM_TryCalloc` and `RM_TryRealloc` - allow modules to handle memory allocation failures gracefully
+* #13069 New API call: `RM_ClusterKeySlot` - which slot a key will hash to
+* #13069 New API call: `RM_ClusterCanonicalKeyNameInSlot` - get a consistent key that will map to a slot 
+* #12486 New API call: `RM_AddACLCategory` - allow modules to declare new ACL categories
+
+Configuration parameters
+========================
+* #12178 New configuration parameters: `max-new-connections-per-cycle` and `max-new-tls-connections-per-cycle` to limit the number of new client connections per event-loop cycle
+* #7351 Rename some CPU configuration parameters for style alignment. Added alias to the old names to avoid breaking change
+
+CLI tools
+=========
+* #10609 redis-cli: new `-t <timeout>` argument: specify server connection timeout in seconds
+* #11315 redis-cli: new `-4` and `-6` flags to prefer IPV4 or IPV6 on DNS lookup
+* #12862 redis-cli: allows pressing up arrow to return any command (including sensitive commands which are still not persisted)
+* #12543 redis-cli: add reverse history search (like Ctrl+R in terminals)
+* #12826 redis-cli: add `--keystats` and `--keystats-samples` to combines `--memkeys` and `--bigkeys` with additional distribution data
+* #12735 redis-cli: fix: `--bigkeys` and `--memkeys` now work on cluster replicas
+* #9411 redis-benchmark: add support for binary strings
+* #12986 redis-benchmark: fix: pick random slot for a node to distribute operation across slots
 
-Happy hacking!

src/version.h

@@ -1,2 +1,2 @@
-#define REDIS_VERSION "255.255.255"
-#define REDIS_VERSION_NUM 0x00ffffff
+#define REDIS_VERSION "7.3.241"
+#define REDIS_VERSION_NUM 0x000703f1