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Redis 7.0.5 Released Wed Sep 21 20:00:00 IST 2022
================================================================================
Upgrade urgency: SECURITY, contains fixes to security issues.
Security Fixes:
* (CVE-2022-35951) Executing a XAUTOCLAIM command on a stream key in a specific
state, with a specially crafted COUNT argument, may cause an integer overflow,
a subsequent heap overflow, and potentially lead to remote code execution.
The problem affects Redis versions 7.0.0 or newer
[reported by Xion (SeungHyun Lee) of KAIST GoN].
Module API changes
==================
* Fix RM_Call execution of scripts when used with M/W/S flags to properly
handle script flags
* Fix RM_SetAbsExpire and RM_GetAbsExpire API registration
Bug Fixes
=========
* Fix a hang when eviction is combined with lazy-free and maxmemory-eviction-tenacity is set to 100
* Fix a crash when a replica may attempt to set itself as its master as a result of a manual failover
* Fix a bug where a cluster-enabled replica node may permanently set its master's hostname to '?'
* Fix a crash when a Lua script returns a meta-table
Fixes for issues in previous releases of Redis 7.0
--------------------------------------------------
* Fix redis-cli to do DNS lookup before sending CLUSTER MEET
* Fix crash when a key is lazy expired during cluster key migration
* Fix AOF rewrite to fsync the old AOF file when a new one is created
* Fix some crashes involving a list containing entries larger than 1GB
* Correctly handle scripts with a non-read-only shebang on a cluster replica
* Fix memory leak when unloading a module
* Fix bug with scripts ignoring client tracking NOLOOP
* Fix client-side tracking breaking protocol when FLUSHDB / FLUSHALL / SWAPDB is used inside MULTI-EXEC
* Fix ACL: BITFIELD with GET and also SET / INCRBY can be executed with read-only key permission
* Fix missing sections for INFO ALL when also requesting a module info section
================================================================================
Redis 7.0.4 Released Monday Jul 18 12:00:00 IST 2022
================================================================================
Upgrade urgency: SECURITY, contains fixes to security issues.
Security Fixes:
* (CVE-2022-31144) A specially crafted XAUTOCLAIM command on a stream
key in a specific state may result with heap overflow, and potentially
remote code execution. The problem affects Redis versions 7.0.0 or newer.
================================================================================
Redis 7.0.3 Released Monday Jul 11 12:00:00 IST 2022
================================================================================
Upgrade urgency: MODERATE, specifically if you're using a previous release of
Redis 7.0, contains fixes for bugs in previous 7.0 releases.
Performance and resource utilization improvements
=================================================
* Optimize zset conversion on large ZRANGESTORE
* Optimize the performance of sending PING on large clusters
* Allow for faster restart of Redis in cluster mode
INFO fields and introspection changes
=====================================
* Add missing sharded pubsub keychannel count to CLIENT LIST
* Add missing pubsubshard_channels field in INFO STATS
Module API changes
==================
* Add RM_StringToULongLong and RM_CreateStringFromULongLong
* Add RM_SetClientNameById and RM_GetClientNameById
Changes in CLI tools
====================
* Add missing cluster-port support to redis-cli --cluster
Other General Improvements
==========================
* Account sharded pubsub channels memory consumption
* Allow ECHO in loading and stale modes
* Cluster: Throw -TRYAGAIN instead of -ASK on migrating nodes for multi-key
commands when the node only has some of the keys
Bug Fixes
=========
* TLS: Notify clients on connection shutdown
* Fsync directory while persisting AOF manifest, RDB file, and config file
* Script that made modification will not break with unexpected NOREPLICAS error
* Cluster: Fix a bug where nodes may not acknowledge a CLUSTER FAILOVER TAKEOVER
after a replica reboots
* Cluster: Fix crash during handshake and cluster shards call
Fixes for issues in previous releases of Redis 7.0
--------------------------------------------------
* TLS: Fix issues with large replies
* Correctly report the startup warning for vm.overcommit_memory
* redis-server command line allow passing config name and value in the same argument
* Support --save command line argument with no value for backwards compatibility
* Fix CLUSTER RESET command regression requiring an argument
================================================================================
Redis 7.0.2 Released Sunday Jun 12 12:00:00 IST 2022
================================================================================
Upgrade urgency: MODERATE, specifically if you're using a previous release of
Redis 7.0, contains fixes for bugs in previous 7.0 releases.
Bug Fixes
=========
* Fixed SET and BITFIELD commands being wrongly marked movablekeys
Regression in 7.0 possibly resulting in excessive roundtrip from cluster clients.
* Fix crash when /proc/sys/vm/overcommit_memory is inaccessible
Regression in 7.0.1 resulting in crash on startup on some configurations.
================================================================================
Redis 7.0.1 Released Wed Jun 8 12:00:00 IST 2022
================================================================================
Upgrade urgency: MODERATE, specifically if you're using a previous release of
Redis 7.0, contains some behavior changes for new 7.0 features and important
fixes for bugs in previous 7.0 releases.
Improvements
============
* Add warning for suspected slow system clocksource setting
Add --check-system command line option.
* Allow read-only scripts (*_RO commands, and ones with `no-writes` flag)
during CLIENT PAUSE WRITE
* Add `readonly` flag in COMMAND command for EVAL_RO, EVALSHA_RO and FCALL_RO
* redis-server command line arguments now accept one string with spaces
for multi-arg configs
Potentially Breaking Changes
============================
* Omitting a config option value in command line argument no longer works
* Hide the `may_replicate` flag from the COMMAND command response
Potentially Breaking Changes for new Redis 7.0 features
-------------------------------------------------------
* Protocol: Sharded pubsub publish emits `smessage` instead of `message`
* CLUSTER SHARDS returns slots as RESP integers, not strings
* Block PFCOUNT and PUBLISH in read-only scripts (*_RO commands, and no-writes)
* Scripts that declare the `no-writes` flag are implicitly `allow-oom` too
Changes in CLI tools
====================
* redis-cli --bigkeys, --memkeys, --hotkeys, --scan. Finish nicely after Ctrl+C
Platform / toolchain support related improvements
=================================================
* Support tcp-keepalive config interval on MacOs
* Support RSS metrics on Haiku OS
INFO fields and introspection changes
=====================================
* Add isolated network metrics for replication.
Module API changes
==================
* Add two more new checks to RM_Call script mode
* Add new RM_Call flag to let Redis automatically refuse `deny-oom` commands
* Add module API RM_MallocUsableSize
* Add missing REDISMODULE_NOTIFY_NEW
* Fix cursor type in RedisModuleScanCursor to handle more than 2^31 elements
* Fix RM_Yield bugs and RM_Call("EVAL") OOM check bug
* Fix bugs in enum configs with overlapping bit flags
Bug Fixes
=========
* FLUSHALL correctly resets rdb_changes_since_last_save INFO field
* FLUSHDB is now propagated to replicas / AOF, even if the db is empty
* Replica fail and retry the PSYNC if the master is unresponsive
* Fix ZRANGESTORE crash when zset_max_listpack_entries is 0
Fixes for issues in previous releases of Redis 7.0
--------------------------------------------------
* CONFIG REWRITE could cause a config change to be dropped for aliased configs
* CONFIG REWRITE would omit rename-command and include lines
NOTE: Affected users who used Redis 7.0.0 to rewrite their configuration file
should review and fix the file.
* Fix broken protocol after MISCONF (persistence) error
* Fix --save command line regression
* Fix possible regression around TLS config changes. re-load files even if the
file name didn't change.
* Re-add SENTINEL SLAVES command, missing in redis 7.0
* BZMPOP gets unblocked by non-key args and returns them
* Fix possible memory leak in XADD and XTRIM
================================================================================
Redis 7.0.0 GA Released Wed Apr 27 12:00:00 IST 2022
================================================================================
Upgrade urgency: SECURITY, contains fixes to security issues.
Security Fixes:
* (CVE-2022-24736) An attacker attempting to load a specially crafted Lua script
can cause NULL pointer dereference which will result with a crash of the
redis-server process. This issue affects all versions of Redis.
[reported by Aviv Yahav].
* (CVE-2022-24735) By exploiting weaknesses in the Lua script execution
environment, an attacker with access to Redis can inject Lua code that will
execute with the (potentially higher) privileges of another Redis user.
[reported by Aviv Yahav].
New Features
============
* Keyspace event for new keys
Command replies that have been extended
---------------------------------------
* COMMAND DOCS shows deprecated_since field in command args
* COMMAND DOCS shows module name where applicable
Potentially Breaking Changes
============================
* Replicas panic when they fail writing persistence
* Prevent cross slot operations in functions and scripts with shebang
* Rephrased some error responses about invalid commands or args
* Lua scripts do not have access to the print() function
Performance and resource utilization improvements
=================================================
* Speed optimization in streams
* Speed optimization in command execution pipeline
* Speed optimization in listpack encoded sorted
* Speed optimization in latency tracking at INFO (relevant for 7.0 RCs)
* Speed optimization when there are many replicas (relevant for 7.0 RCs)
New configuration options
=========================
* Allow ignoring disk persistence errors on replicas
* Allow abort with panic when replica fails to execute a command sent by the master
* Allow configuring shutdown flags of SIGTERM and SIGINT
* Allow attaching an operating system-specific identifier to Redis sockets
Module API changes
==================
* Add argument specifying ACL reason for module log entry
Breaking API compatibility with 7.0 RCs
* Add the deprecated_since field in command args of COMMAND DOCS
Breaking API/ABI compatibility with 7.0 RCs
* Add module API flag for using enum configs as bit flags
* Add RM_PublishMessageShard
* Add RM_MallocSizeString, RM_MallocSizeDict
* Add RM_TryAlloc
Bug Fixes
=========
* Replica report disk persistence errors in PING
* Fixes around rejecting commands on replicas and AOF when they must be respected
* Durability fixes for appendfsync=always policy
Fixes for issues in previous release candidates of Redis 7.0
------------------------------------------------------------
* Fix possible crash on CONFIG REWRITE
* Fix regression not aborting transaction on errors
* Fix auto-aof-rewrite-percentage based AOFRW trigger after restart
* Fix bugs when AOF enabled after startup, in case of failure before the first rewrite completes
* Fix RM_Yield module API bug processing future commands of the current client
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Redis 6.2.6
Upgrade urgency: SECURITY, contains fixes to security issues.
Security Fixes:
* (CVE-2021-41099) Integer to heap buffer overflow handling certain string
commands and network payloads, when proto-max-bulk-len is manually configured
to a non-default, very large value [reported by yiyuaner].
* (CVE-2021-32762) Integer to heap buffer overflow issue in redis-cli and
redis-sentinel parsing large multi-bulk replies on some older and less common
platforms [reported by Microsoft Vulnerability Research].
* (CVE-2021-32687) Integer to heap buffer overflow with intsets, when
set-max-intset-entries is manually configured to a non-default, very large
value [reported by Pawel Wieczorkiewicz, AWS].
* (CVE-2021-32675) Denial Of Service when processing RESP request payloads with
a large number of elements on many connections.
* (CVE-2021-32672) Random heap reading issue with Lua Debugger [reported by
Meir Shpilraien].
* (CVE-2021-32628) Integer to heap buffer overflow handling ziplist-encoded
data types, when configuring a large, non-default value for
hash-max-ziplist-entries, hash-max-ziplist-value, zset-max-ziplist-entries
or zset-max-ziplist-value [reported by sundb].
* (CVE-2021-32627) Integer to heap buffer overflow issue with streams, when
configuring a non-default, large value for proto-max-bulk-len and
client-query-buffer-limit [reported by sundb].
* (CVE-2021-32626) Specially crafted Lua scripts may result with Heap buffer
overflow [reported by Meir Shpilraien].
Bug fixes that involve behavior changes:
* GEO* STORE with empty source key deletes the destination key and return 0
Previously it would have returned an empty array like the non-STORE variant.
* PUBSUB NUMPAT replies with number of patterns rather than number of subscriptions
This actually changed in 6.2.0 but was overlooked and omitted from the release notes.
Bug fixes that are only applicable to previous releases of Redis 6.2:
* Fix CLIENT PAUSE, used an old timeout from previous PAUSE
* Fix CLIENT PAUSE in a replica would mess the replication offset
* Add some missing error statistics in INFO errorstats
Other bug fixes:
* Fix incorrect reply of COMMAND command key positions for MIGRATE command
* Fix appendfsync to always guarantee fsync before reply, on MacOS and FreeBSD (kqueue)
* Fix the wrong mis-detection of sync_file_range system call, affecting performance
CLI tools:
* When redis-cli received ASK response, it didn't handle it
Improvements:
* Add latency monitor sample when key is deleted via lazy expire
* Sanitize corrupt payload improvements
* Delete empty keys when loading RDB file or handling a RESTORE command
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Redis 6.2.1
Upgrade urgency: LOW.
Bug fixes:
* Fix sanitize-dump-payload for stream with deleted records
* Prevent client-query-buffer-limit config from being set to lower than 1mb
Improvements:
* Make port, tls-port and bind config options modifiable at runtime
Platform and deployment-related changes:
* Fix compilation error on non-glibc systems if jemalloc is not used
* Improved memory consumption and memory usage tracking on FreeBSD
* Fix compilation on ARM64 MacOS with jemalloc
Modules:
* New Module API for getting user name of a client
* Optimize RM_Call by utilizing a shared reusable client
* Fix crash running CLIENT INFO via RM_Call
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Redis 6.2.0 GA Released Tue Feb 22 14:00:00 IST 2021
================================================================================
Upgrade urgency: SECURITY if you use 32bit build of redis (see bellow), MODERATE
if you used earlier versions of Redis 6.2, LOW otherwise.
Integer overflow on 32-bit systems (CVE-2021-21309):
Redis 4.0 or newer uses a configurable limit for the maximum supported bulk
input size. By default, it is 512MB which is a safe value for all platforms.
If the limit is significantly increased, receiving a large request from a client
may trigger several integer overflow scenarios, which would result with buffer
overflow and heap corruption.
Bug fixes:
* Avoid 32-bit overflows when proto-max-bulk-len is set high
* Fix broken protocol in client tracking tracking-redir-broken message
* Avoid unsafe field name characters in INFO commandstats, errorstats, modules
* XINFO able to access expired keys during CLIENT PAUSE WRITE
* Fix allowed length for REPLCONF ip-address, needed due to Sentinel's support for hostnames
* Fix broken protocol in redis-benchmark when used with -a or --dbnum
* XADD counts deleted records too when considering switching to a new listpack
Bug fixes that are only applicable to previous releases of Redis 6.2:
* Fixes in GEOSEARCH bybox (accuracy and mismatch between width and height)
* Fix risk of OOM panic in HRANDFIELD, ZRANDMEMBER commands with huge negative count
* Fix duplicate replicas issue in Sentinel, needed due to hostname support
* Fix Sentinel configuration rewrite
Command behavior changes:
* SRANDMEMBER uses RESP3 array type instead of set type
* EXPIRE, EXPIREAT, SETEX, GETEX: Return error when provided expire time overflows
Other behavior changes:
* Remove ACL subcommand validation if fully added command exists.
Improvements:
* Optimize sorting in GEORADIUS / GEOSEARCH with COUNT
* Optimize HRANDFIELD and ZRANDMEMBER case 4 when ziplist encoded
* Optimize in-place replacement of elements in HSET, HINCRBY, LSET
* Remove redundant list to store pubsub patterns
* Add --insecure option to command line tools
Info fields and introspection changes:
* Add INFO fields to track progress of BGSAVE, AOFRW, replication
Modules:
* RM_ZsetRem: Delete key if empty, the bug could leave empty zset keys
* RM_HashSet: Add COUNT_ALL flag and set errno
Redis 6.2 RC3 Released Tue Feb 1 14:00:00 IST 2021
================================================================================
Upgrade urgency LOW: This is the third Release Candidate of Redis 6.2.
New commands / args:
* Add HRANDFIELD and ZRANDMEMBER commands
* Add FAILOVER command
* Add GETEX, GETDEL commands
* Add PXAT/EXAT arguments to SET command
* Add SYNC arg to FLUSHALL and FLUSHDB, and ASYNC/SYNC arg to SCRIPT FLUSH
Sentinel:
* Add hostname support to Sentinel
* Prevent file descriptors from leaking into Sentinel scripts
* Fix config file line order dependency and config rewrite sequence
New configuration options:
* Add set-proc-title config option to disable changes to the process title
* Add proc-title-template option to control what's shown in the process title
* Add lazyfree-lazy-user-flush config option to control FLUSHALL, FLUSHDB and SCRIPT FLUSH
Bug fixes:
* AOF: recover from last write error by turning on/off appendonly config
* Exit on fsync error when the AOF fsync policy is 'always'
* Avoid assertions (on older kernels) when testing arm64 CoW bug
* CONFIG REWRITE should honor umask settings
* Fix firstkey,lastkey,step in COMMAND command for some commands
Special considerations:
* Fix misleading description of the save configuration directive
Improvements:
* A way to get RDB file via replication without excessive replication buffers
* Optimize performance of clusterGenNodesDescription for large clusters
Info fields and introspection changes:
* SLOWLOG and LATENCY monitor include unblocking time of blocked commands
Modules:
* Add modules API for streams
* Add event for fork child birth and termination
* Add RM_BlockedClientMeasureTime* etc, to track background processing in commandstats
* Fix bug in v6.2, wrong value passed to the new unlink callback
* Fix bug in v6.2, modules blocked on keys unblock on commands like LPUSH
Redis 6.2 RC2 Released Tue Jan 12 16:17:20 IST 2021
================================================================================
Upgrade urgency LOW: This is the second Release Candidate of Redis 6.2.
IMPORTANT: If you're running Redis on ARM64 or a big-endian system, upgrade may
have significant implications. Please be sure to read the notes below.
New commands / args:
* Add the REV, BYLEX and BYSCORE arguments to ZRANGE, and the ZRANGESTORE command
* Add the XAUTOCLAIM command
* Add the MINID trimming strategy and the LIMIT argument to XADD and XTRIM
* Add the ANY argument to GEOSEARCH and GEORADIUS
* Add the CH, NX, XX arguments to GEOADD
* Add the COUNT argument to LPOP and RPOP
* Add the WRITE argument to CLIENT PAUSE for pausing write commands exclusively
* Change the proto-ver argument of HELLO to optional
* Add the CLIENT TRACKINGINFO subcommand
Command behavior changes:
* CLIENT TRACKING yields an error when given overlapping BCAST prefixes
* SWAPDB invalidates WATCHed keys
* SORT command behaves differently when used on a writable replica
Other behavior changes:
* Avoid propagating MULTI/EXEC for read-only transactions
* Remove the read-only flag from TIME, ECHO, ROLE, LASTSAVE
* Fix the command flags of PFDEBUG
* Tracking clients will no longer receive unnecessary key invalidation messages after FLUSHDB
* Sentinel: Fix missing updates to the config file after SENTINEL SET command
Bug fixes with compatibility implications (bugs introduced in Redis 6.0):
* Fix RDB CRC64 checksum on big-endian systems
If you're using big-endian please consider the compatibility implications with
RESTORE, replication and persistence.
* Fix wrong order of key/value in Lua's map response
If your scripts use redis.setresp() or return a map (new in Redis 6.0), please
consider the implications.
Bug fixes that are only applicable to previous releases of Redis 6.2:
* Resolve rare assertions in active defragmentation while loading
Bug fixes:
* Fix the selection of a random element from large hash tables
* Fix an issue where a forked process deletes the parent's pidfile
* Fix crashes when enabling io-threads-do-reads
* Fix a crash in redis-cli after executing cluster backup
* Fix redis-benchmark to use an IP address for the first cluster node
* Fix saving of strings larger than 2GB into RDB files
Additional improvements:
* Improve replication handshake time
* Release client tracking table memory asynchronously in cases where the DB is also freed asynchronously
* Avoid wasteful transient memory allocation in certain cases
* Handle binary string values by the 'requirepass' and 'masterauth' configs
Platform and deployment-related changes:
* Install redis-check-rdb and redis-check-aof as symlinks to redis-server
* Add a check for an ARM64 Linux kernel bug
Due to the potential severity of this issue, Redis will refuse to run on
affected platforms by default.
Info fields and introspection changes:
* Add the errorstats section to the INFO command
* Add the failed_calls and rejected_calls fields INFO's commandstats section
* Report child copy-on-write metrics continuously
Module API changes:
* Add the RedisModule_SendChildCOWInfo API
* Add the may-replicate command flag
Redis 6.2 RC1 Released Mon Dec 14 11:50:00 IST 2020
================================================================================
Upgrade urgency LOW: This is the first Release Candidate of Redis 6.2.
Introduction to the Redis 6.2 release
=====================================
This release is the first significant Redis release managed by the core team
under the new project governance model.
Redis 6.2 includes many new commands and improvements, but no big features. It
mainly makes Redis more complete and addresses issues that have been requested
by many users frequently or for a long time.
Many of these changes were not eligible for 6.0.x for several reasons:
1. They are not backward compatible, which is always the case with new or
extended commands (that cannot be replicated to an older replica).
2. They require a longer release-candidate test cycle.
New commands / args:
* Add SMISMEMBER command that checks multiple members
* Add ZMSCORE command that returns an array of scores
* Add LMOVE and BLMOVE commands that pop and push arbitrarily
* Add RESET command that resets client connection state
* Add COPY command that copies keys
* Add ZDIFF and ZDIFFSTORE commands
* Add ZINTER and ZUNION commands
* Add GEOSEARCH/GEOSEARCHSTORE commands for bounding box spatial queries
* Add GET parameter to SET command, for more powerful GETSET
* Add exclusive range query to XPENDING
* Add exclusive range query to X[REV]RANGE
* Add GT and LT options to ZADD for conditional score updates
* Add CLIENT INFO and CLIENT LIST for specific ids
* Add IDLE argument to XPENDING command
* Add local address to CLIENT LIST, and a CLIENT KILL filter.
* Add NOMKSTREAM option to XADD command
* Add command introspection to Sentinel
* Add SENTINEL MYID subcommand
New features:
* Dump payload sanitization: prevent corrupt payload causing crashes
Has flags to enable full O(N) validation (disabled by default).
* ACL patterns for Pub/Sub channels
* Support ACL for Sentinel mode
* Support getting configuration from both stdin and file at the same time
Lets you avoid storing secrets on the disk.
New features in CLI tools:
* redis-cli RESP3 push support
* redis-cli cluster import support source and target that require auth
* redis-cli URIs able to provide user name in addition to password
* redis-cli/redis-benchmark allow specifying the prefered ciphers/ciphersuites
* redis-cli add -e option to exit with code when command execution fails
Command behavior changes:
* EXISTS should not alter LRU
In Redis 5.0 and 6.0 it would have touched the LRU/LFU of the key.
* OBJECT should not reveal logically expired keys
Will now behave the same TYPE or any other non-DEBUG command.
* Improve db id range check for SELECT and MOVE
Changes the error message text on a wrong db index.
* Modify AUTH / HELLO error message
Changes the error message text when the user isn't found or is disabled.
* BITOPS length limited to proto_max_bulk_len rather than 512MB
The limit is now configurable like in SETRANGE, and APPEND.
* GEORADIUS[BYMEMBER] can fail with -OOM if Redis is over the memory limit
Other behavior changes:
* Optionally (default) fail to start if requested bind address is not available
If you rely on Redis starting successfully even if one of the bind addresses
is not available, you'll need to tune the new config.
* Limit the main db dictionaries expansion to prevent key eviction
In the past big dictionary rehashing could result in massive data eviction.
Now this rehashing is delayed (up to a limit), which can result in performance
loss due to hash collisions.
* CONFIG REWRITE is atomic and safer, but requires write access to the config file's folder
This change was already present in 6.0.9, but was missing from the release
notes.
* A new incremental eviction mechanism that reduces latency on eviction spikes
In pathological cases this can cause memory to grow uncontrolled and may require
specific tuning.
* Not resetting "save" config when Redis is started with command line arguments.
In case you provide command line arguments without "save" and count on it
being disabled, Now the defaults "save" config will kick in.
* Update memory metrics for INFO during loading
* When "supervised" config is enabled, it takes precedence over "daemonize".
* Assertion and panic, print crash log without generating SIGSEGV
* Added crash log report on SIGABRT, instead of silently exiting
* Disable THP (Transparent Huge Pages) if enabled
If you deliberately enabled it, you'll need to config Redis to keep it.
Bug fixes:
* Handle output buffer limits for module blocked clients
Could result in a module sending reply to a blocked client to go beyond the
limit.
* Fix setproctitle related crashes.
Caused various crashes on startup, mainly on Apple M1 chips or under
instrumentation.
* A module doing RM_Call could cause replicas to get nested MULTI
* Backup/restore cluster mode keys to slots map for repl-diskless-load=swapdb
In cluster mode with repl-diskless-load, when loading failed, slot map
wouldn't have been restored.
* Fix oom-score-adj-values range, and bug when used in config file
Enabling setting this in the config file in a line after enabling it, would
have been buggy.
* Reset average ttl when empty databases
Just causing misleading metric in INFO
* Disable rehash when Redis has child process
This could have caused excessive CoW during BGSAVE, replication or AOFRW.
* Further improved ACL algorithm for picking categories
Output of ACL GETUSER is now more similar to the one provided by ACL SETUSER.
* Fix bug with module GIL being released prematurely
Could in theory (and rarely) cause multi-threaded modules to corrupt memory.
* Fix cluster redirect for module command with no firstkey.
* Reduce effect of client tracking causing feedback loop in key eviction
* Kill disk-based fork child when all replicas drop and 'save' is not enabled
* Rewritten commands (modified for propagation) are logged as their original command
* Fix cluster access to unaligned memory (SIGBUS on old ARM)
* If diskless repl child is killed, make sure to reap the child pid
* Broadcast a PONG message when slot's migration is over, may reduce MOVED responses
Other improvements:
* TLS Support in redis-benchmark
* Accelerate diskless master connections, and general re-connections
* Run active defrag while blocked / loading
* Performance and memory reporting improvement - sds take control of its internal fragmentation
* Speedup cluster failover.
Platform / toolchain support related improvements:
* Optionally (not by default) use H/W Monotonic clock for faster time sampling
* Remove the requirements for C11 and _Atomic supporting compiler
This would allow to more easily build and use Redis on older systems and
compilers again.
* Fix crash log registers output on ARM.
* Raspberry build fix.
* Setting process title support for Haiku.
* DragonFlyBSD RSS memory sampling support.
New configuration options:
* Enable configuring OpenSSL using the standard openssl.cnf
* oom-score-adj-values config can now take absolute values (besides relative ones)
* TLS: Add different client cert support.
* Note that a few other changes listed above added their config options.
Info fields and introspection changes:
* Add INFO fields to track diskless and disk-based replication progress
* Add INFO field for main thread cpu time, and scrape system time.
* Add total_forks to INFO STATS
* Add maxclients and cluster_connections to INFO CLIENTS
* Add tracking bcast flag and client redirection in client list
* Fixed INFO client_recent_max_input_buffer includes argv array
* Note that a few other changes listed above added their info fields.
Module API changes:
* Add CTX_FLAGS_DENY_BLOCKING as a unified the way to know if blocking is allowed
* Add data type callbacks for lazy free effort, and unlink
* Add data type callback for COPY command
* Add callbacks for defrag support.
* Add module event for repl-diskless-load swapdb
Module related fixes:
* Moved RMAPI_FUNC_SUPPORTED so that it's usable
* Improve timer accuracy
* Allow '\0' inside of result of RM_CreateStringPrintf
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Redis 6.0.9
===========
Upgrade urgency: SECURITY if you use an affected platform (see below).
Otherwise the upgrade urgency is MODERATE.
This release fixes a potential heap overflow when using a heap allocator other
than jemalloc or glibc's malloc. See:
https://github.com/redis/redis/pull/7963
Other fixes in this release:
New:
* Memory reporting of clients argv
* Add redis-cli control on raw format line delimiter
* Add redis-cli support for rediss:// -u prefix
* Get rss size support for NetBSD and DragonFlyBSD
Behavior changes:
* WATCH no longer ignores keys which have expired for MULTI/EXEC
* Correct OBJECT ENCODING response for stream type
* Allow blocked XREAD on a cluster replica
* TLS: Do not require CA config if not used
Bug fixes:
* INFO report real peak memory (before eviction)
* Allow requirepass config to clear the password
* Fix config rewrite file handling to make it really atomic
* Fix excessive categories being displayed from ACLs
* Add fsync in replica when full RDB payload was received
* Don't write replies to socket when output buffer limit reached
* Fix redis-check-rdb support for modules aux data
* Other smaller bug fixes
Modules API:
* Add APIs for version and compatibility checks
* Add RM_GetClientCertificate
* Add RM_GetDetachedThreadSafeContext
* Add RM_GetCommandKeys
* Add Swapdb Module Event
* RM_GetContextFlags provides indication of being in a fork child
* RM_GetContextFlags document missing flags: MULTI_DIRTY, IS_CHILD
* Expose real client on connection events
* Minor improvements to module blocked on keys
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Redis 6.0.3:
Upgrade urgency CRITICAL: a crash introduced in 6.0.2 is now fixed.
Redis 6.0.2:
Upgrade urgency MODERATE: many not critical bugfixes in different areas.
Critical fix to client side caching when
keys are evicted from the tracking table but
no notifications are sent.
The following are the most serious fix:
* XPENDING should not update consumer's seen-time
* optimize memory usage of deferred replies - fixed
* Fix CRC64 initialization outside the Redis server itself.
* stringmatchlen() should not expect null terminated strings.
* Cluster nodes availability checks improved when there is
high Pub/Sub load on the cluster bus.
* Redis Benchmark: Fix coredump because of double free
* Tracking: send eviction messages when evicting entries.
* rax.c updated from upstream antirez/rax.
* fix redis 6.0 not freeing closed connections during loading.
New features:
dd
* Support setcpuaffinity on linux/bsd
* Client Side Caching: Add Tracking Prefix Number Stats in Server Info
* Add --user argument to redis-benchmark.c (ACL)
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Redis 6.0.1
===========
Upgrade urgency HIGH: This release fixes a crash when builiding against
Libc malloc.
Here we revert 8110ba888, an optimization that causes a crash due to a
bug in the code. It does not happen with the default allocator because of
differences between Jemalloc and libc malloc, so this escaped all our
testing but was reported by a user. We'll add back the original optimization
that was reverted here later, after checking what happens: it is not a
critical optimization.
Redis 6.0.0 GA
==============
Upgrade urgency CRITICAL: many bugs fixed compared to the last release
candidate. Better to upgrade if you see things
affecting your environment in the changelog.
Hi all, finally we have Redis 6.0.0 GA! Enjoy this new Redis release.
Most of the documentation was updated today so that you can likely
find what you are looking for about the new features at redis.io.
This is the list of what changed compared to the previoius release candidate:
* XCLAIM AOF/replicas propagation fixed.
* Client side caching: new NOLOOP option to avoid getting notified about
changes performed by ourselves.
* ACL GENPASS now uses HMAC-SHA256 and have an optional "bits" argument.
It means you can use it as a general purpose "secure random strings"
primitive!
* Cluster "SLOTS" subcommand memory optimization.
* The LCS command is now a subcommand of STRALGO.
* Meaningful offset for replicas as well. More successful partial
resynchronizations.
* Optimize memory usage of deferred replies.
* Faster CRC64 algorithm for faster RDB loading.
* XINFO STREAM FULL, a new subcommand to get the whole stream state.
* CLIENT KILL USER <username>.
* MIGRATE AUTH2 option, for ACL style authentication support.
* Other random bugfixes.
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Redis 5.0.3
===========
Upgrade urgency HIGH: Redis 5 is consolidating, upgrading is a good idea.
However there is nothing very critical here, but certain
issues resolved could lead to very rare crashes.
Welcome to Redis 5.0.3, several interesting bug fixes here:
* Redis no longer panics when you send data to a replica-mode connection that
is in MONITOR or SYNC mode.
* Fixes to certain sorted set edge cases. You are unlikely to ever notice those
issues, but now it is more correct.
* Certain BSD variants now are better supported: build & register logging
on crash.
* The networking core now recovers if an IPv6 address is listed in bind but
is actually not able to work because there is no such protocol in the
system.
* redis-cli cluster mode improved in many ways. Especially the fix subcommand
work was enhanced to cover other edge cases that were still not covered
after the work done for Redis 5.
* MEMORY USAGE is now more accurate.
* DEBUG DIGEST-VALUE added in case you want to make sure a given set of keys
(and not the whole DB) are excatly the same between two instances.
* Fix a potential crash in the networking code related to recent changes
to the way the reply is consumed.
* Reject EXEC containing write commands against an instance that changed role
from master to replica during our transaction.
* Fix a crash in KEYS and other commands using pattern matching, in an edge
case where the pattern contains a zero byte.
* Fix eviction during AOF loading due to maxmemory triggered by commands
executed in loading state.
Redis 5.0.2
===========
Upgrade urgency: CRITICAL if you use streams and consumer groups.
HIGH if you use redis-cli with Redis Cluster.
LOW otherwise.
Welcome to Redis 5.0.2. This release fixes two issues with Streams consumer
groups, where items could be returned duplicated by XREADGROUP when accessing
the history, and another bug where XREADGROUP can report some history even
if the comsumer pending list is empty. Both problems were addressed and unit
tests to avoid regressions implemented. Moreover this release fixes some
issue with redis-cli when in cluster mode. Finally some FreeBSD and DragonFly
build problems are now resolved. The list of the commits is below.
Redis 5.0.1
===========
Upgrade urgency: URGENT if you use Redis Streams. MODERATE otherwise.
Hi all, this is the first patch level release of Redis 5. It contains
both fixes and improvements. Here there is a list of the major ones, however
read the commit messages at the end of the changelog if you want to know
more about the smaller things. Let's start with the new features:
* Sentinel now supports authentication! Check the Sentinel official doc
for more info.
* Redis-cli cluster "fix" is now able to fix a big number of clusters put
in a bad condition. Previously many corner cases were not covered.
Now the critical fixes:
1. Fix RESTORE mismatch reply when certain keys already expired.
2. Fix an XCLAIM non trivial issue: sometimes the command returned a wrong
entry or desynchronized the protocol.
And now the other fixes:
3. Stack trace generation on the Raspberry PI (and 32bit ARM) fixed.
4. Don't evict expired keys when the KEYS command is called, in order to
avoid a mass deletion event. However expired keys are not displayed
by KEYS as usually.
5. Improvements in the computation of the memory used, when estimating
the AOF buffers.
6. XRANGE COUNT of 0 fixed.
7. "key misses" stats accounting fixed. Many cache misses were not counted.
8. When in MULTI state, return OOM while accumulating commands and there
is no longer memory available.
9. Fix build on FreeBSD and possibly others.
10. Fix a crash in Redis modules, thread safe context reply accumulation.
11. Fix a race condition when producing the RDB file for full SYNC.
12. Disable protected mode in Sentinel.
13. More commands now have the HELP subcommand.
14. Fixed an issue about adaptive server HZ timer.
15. Fix cluster-replica-no-failover option name.
Redis 5.0.0
===========
Upgrade urgency CRITICAL: Several fixes to streams AOF and replication.
1. The new Stream data type. https://redis.io/topics/streams-intro
2. New Redis modules APIs: Timers, Cluster and Dictionary APIs.
3. RDB now store LFU and LRU information.
4. The cluster manager was ported from Ruby (redis-trib.rb) to C code
inside redis-cli. Check `redis-cli --cluster help` for more info.
5. New sorted set commands: ZPOPMIN/MAX and blocking variants.
6. Active defragmentation version 2.
7. Improvemenets in HyperLogLog implementations.
8. Better memory reporting capabilities.
9. Many commands with sub-commands now have an HELP subcommand.
10. Better performances when clients connect and disconnect often.
11. Many bug fixes and other random improvements.
12. Jemalloc was upgraded to version 5.1
13. CLIENT UNBLOCK and CLIENT ID.
14. The LOLWUT command was added. http://antirez.com/news/123
15. We no longer use the "slave" word if not for API backward compatibility.
16. Differnet optimizations in the networking layer.
17. Lua improvements:
- Better propagation of Lua scripts to replicas / AOF.
- Lua scripts can now timeout and get in -BUSY state in the replica as well.
18. Dynamic HZ to balance idle CPU usage with responsiveness.
19. The Redis core was refactored and improved in many ways.
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Redis 4.0.10 fixes a number of important issues:
* Important security issues related to the Lua scripting engine.
Please check https://github.com/antirez/redis/issues/5017
for more information.
* A bug with SCAN, SSCAN, HSCAN and ZSCAN, that may not return all the elements.
We also add a regression test that can trigger the issue often when present, and
may in theory be able to find unrelated regressions.
* A PSYNC2 bug is fixed: Redis should not expire keys when saving RDB files
because otherwise it is no longer possible to use such RDB file as a base
for partial resynchronization. It no longer represents the right state.
* Compatibility of AOF with RDB preamble when the RDB checksum is disabled.
* Sentinel bug that in some cases prevented Sentinel to detect that the master
was down immediately. A delay was added to the detection.
* Other minor issues.
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Bug fixes:
- Loading two or more modules exporting native data types resulted
into the inability to reload the RDB file.
- Crash in modules when calling from Lua scripts module commands that
would block.
- A Redis Cluster crash due to mis-handling of the "migrate-to"
internal flag.
- Other smaller fixes not worth of a release per se, but nice to add
here.
Redis 4.0.0
Major features
- Redis modules system. Redis now allows developers to write modules
that can extend the Redis functionalities and implement new data
types.
- Partial Replication (PSYNC) version 2.
- Cache eviction improvements. Redis 4.0 implements LFU (Least
Frequently Used) as a new eviction algorithm, and improves the
functionality, performances and precision of the existing algorithms.
- Lazy freeing of keys. Redis is now able to delete keys in the
background in a different thread without blocking the server.
- Mixed RDB-AOF format. If enabled the new format is used when
rewriting the AOF file: the rewrite uses the more compact and faster
to generate RDB format, and an AOF stream is appended to the file.
- A new MEMORY command, able to perform memory analysis of different
kinds: troubleshooting of memory issues (with MEMORY DOCTOR, similar
to LATENCY DOCTOR), reporting of the amount of memory used by a single
key, more in-depth reporting of Redis memory usage compared to what
the INFO command offers.
- Redis Cluster support for NAT / Docker.
- Redis uses now less memory in order to store the same amount of
data. The gain depends a lot on the kind of dataset stored.
- Redis is now able to defragment the used memory and reclaim space
incrementally while running.
Smaller features
- Improvements to the RDB format to support 64 bit lengths, binary
sorted set scores, and more.
- SWAPDB command: ability to completely and immediately (no latency)
replace two Redis databases.
- Improvements to `dict.c`, the Redis hash table implementation.
- Security improvements mapping POST and Host: commands to QUIT in
order to prevent cross protocol scripting attacks.
- RPUSHX and LPUSHX now accept a variable number of elements.
- Reporting of additional memory used by copy on write in the INFO
output.
- Serious refactoring of many core parts of Redis.
Migrating from 3.2 to 4.0
- The Redis Cluster bus protocol of 4.0 is no longer compatible with
Redis 3.2.
- Redis Cluster CLUSTER NODES output is now slightly different.
- Writable slaves do not propagate writes to their sub-slaves, so
writes to writable slaves remain just local.
- The RDB format changed. Redis 4.0 is still able to read 3.2 (and all
the past versions) files, but not the other way around.
- Certain log formats and sentences are different in Redis 4.0.
- Certain INFO fields, especially related to replication, are now
different.
- GEODIST, GEOPOS and GEOHASH return values changed for non existing
keys
- The SLOWLOG command entires contain additional two fields: the
client address and name. This is documented in the SLOWLOG command online
documentation.
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Upgrade urgency HIGH: Critical fix to Redis Sentinel, due to 3.2.0
regression compared to 3.0.
Hey, this is Redis 3.2.1, and this release should bring some grain of
maturity to Redis 3.2. The list of commits following this note will tell
you the details, but the main things addressed in this release are the
following:
1. A critical bug in Sentinel was hopefully fixed. During the big 3.2
refactoring of Redis Sentinel, in order to implement connection sharing
to make Sentinel able to scale better (few Sentinels to monitor many
masters), a bug was introduced that mis-counted the number of pending
commands in the Redis link. This in turn resulted into an inability to
talk with certain Redis instances. A common result of this bug was the
inability of Redis Sentinel to reconfigure back the old master, after
a failover, when it is reachable again, as the slave of the new master.
This was due to the inability to talk with the old master at all.
2. BITFIELD bugs fixed.
3. GEO commands fixes on syntax errors and edge cases.
4. RESTORE now accepts dumps generated by older Redis versions.
5. Jemalloc now is really configured to save you memory, for a problem a
change in the jemalloc configuration did not really survived when the
3.2.0 release was finalized.
6. TTL and TYPE command no longer alter the last access time of a key, for
LRU evictions purposes. A new TOUCH command was introduced *just* to
update the access time of a key.
7. A bug was fixed in redis-cli, that connected to the instance running on
the port 6379 if there was one, regardless of what was specified.
8. TCP keep alive is now enabled by default. This should fix most ghost
connections problems without resulting in any practical change in
otherwise sane deployments.
9. A Sentinel crash that could happen during failovers was fixed.
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Redis 3.2 contains significant changes to the API and
implementation of Redis.
- A new set of commands for Geo indexing was added (GEOADD,
GEORADIUS and related commands).
- The new BITFIELD command handles contiguous arrays of integers
or counters of arbitrary bits width and offset inside strings.
- Memory optimizations to hold the same data in less memory.
- Lua scripts can now contain side effects using the new effect
replication.
- A complete remote Lua debugger is available in order to make
writing scripts a simpler task.
Read the release notes for the full set of changes:
https://raw.githubusercontent.com/antirez/redis/3.2/00-RELEASENOTES
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--[ Redis 3.0.2 ] Release date: 4 Jun 2015
Upgrade urgency: HIGH for Redis because of a security issue.
LOW for Sentinel.
* [FIX] Critical security issue fix by Ben Murphy: http://t.co/LpGTyZmfS7
* [FIX] SMOVE reply fixed when src and dst keys are the same. (Glenn Nethercutt)
* [FIX] Lua cmsgpack lib updated to support str8 type. (Sebastian Waisbrot)
* [NEW] ZADD support for options: NX, XX, CH. See new doc at redis.io.
(Salvatore Sanfilippo)
* [NEW] Senitnel: CKQUORUM and FLUSHCONFIG commands back ported.
(Salvatore Sanfilippo and Bill Anderson)
--[ Redis 3.0.1 ] Release date: 5 May 2015
Upgrade urgency: LOW for Redis and Cluster, MODERATE for Sentinel.
* [FIX] Sentinel memory leak due to hiredis fixed. (Salvatore Sanfilippo)
* [FIX] Sentinel memory leak on duplicated instance. (Charsyam)
* [FIX] Redis crash on Lua reaching output buffer limits. (Yossi Gottlieb)
* [FIX] Sentinel flushes config on +slave events. (Bill Anderson)
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--[ Redis 3.0.0 ] Release date: 1 Apr 2015
>> What's new in Redis 3.0 compared to Redis 2.8?
* Redis Cluster: a distributed implementation of a subset of Redis.
* New "embedded string" object encoding resulting in less cache
misses. Big speed gain under certain work loads.
* AOF child -> parent final data transmission to minimize latency due
to "last write" during AOF rewrites.
* Much improved LRU approximation algorithm for keys eviction.
* WAIT command to block waiting for a write to be transmitted to
the specified number of slaves.
* MIGRATE connection caching. Much faster keys migraitons.
* MIGARTE new options COPY and REPLACE.
* CLIENT PAUSE command: stop processing client requests for a
specified amount of time.
* BITCOUNT performance improvements.
* CONFIG SET accepts memory values in different units (for example
you can use "CONFIG SET maxmemory 1gb").
* Redis log format slightly changed reporting in each line the role
of the instance (master/slave) or if it's a saving child log.
* INCR performance improvements.
>> Refactoring changes (no new features nor bug fixes)
* Blocking operations full refactoring (blocked.c)
* Client output buffer memory tracking refactored.
See full release notes for 3.0.0:
https://raw.githubusercontent.com/antirez/redis/3.0/00-RELEASENOTES
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* [FIX] Linenoise updated to be more VT100 compatible. (Salvatore Sanfilippo)
* [FIX] A number of typos fixed inside comments. (Various authors)
* [FIX] redis-cli no longer quits after long timeouts. (Matt Stancliff)
* [FIX] Test framework improved to detect never terminating scripts, cleanup
instances on crashes. (Salvatore Sanfilippo)
* [FIX] PFCOUNT can be used on slaves now. (Salvatore Sanfilippo)
* [FIX] ZSCAN no longer report very small scores as 0. (Matt Stancliff,
Michael Grunder, Salvatore Sanfilippo)
* [FIX] Don't show the ASCII logo if syslog is enabled. Redis is now
an Enterprise Grade product. (Salvatore Sanfilippo)
* [NEW] EXPERIMENTAL: Diskless replication, for more info check the doc at
http://redis.io/topics/replication. (Salvatore Sanfilippo).
* [NEW] Transparent Huge Pages detection and reporting in logs and
LATENCY DOCTOR output. (Salvatore Sanfilippo)
* [NEW] Many Lua scripting enhancements: Bitops API, cjson upgrade and tests,
cmsgpack upgrade. (Matt Stancliff)
* [NEW] Total and instantaneous Network bandwidth tracking in INFO.
* [NEW] DEBUG POPULATE two args form implemented (old form still works).
The second argument is the key prefix. Default is "key:" (Salvatore
Sanfilippo)
* [NEW] Check that tcp-backlog is matched by /proc/sys/net/core/somaxconn, and
warn about it if not. (Salvatore Sanfilippo)
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Changes:
2.8.3
* [FIX] Sentinel instance role sampling fixed, the system is now more
reliable during failover and when reconfiguring instances with
non matching configuration.
* [FIX] Inline requests are now handled even when terminated with just LF.
* [FIX] Replication timeout handling greatly improved, now the slave is able
to ping the master while removing the old data from memory, and while
loading the new RDB file. This avoid false timeouts sensed by
masters.
* [FIX] Fixed a replication bug involving 32 bit instances and big datasets
hard to compress that resulted into more than 2GB of RDB file sent.
* [FIX] Return error for inline requests with unbalanced quotes.
* [FIX] Publish the slave replication offset even when disconnected from the
master if there is still a cached master instance.
2.8.2
* [FIX] Sentinel better desynchronization to avoid split-brain elections
where no Sentinel managed to get elected.
* [FIX] Stop accepting writes on "MISCONF" error only if master, not slave.
* [FIX] Reply to PING with an error on "MISCONF" errors.
2.8.1
* [FIX] Fixed a bug in "new Sentinel" config propagation.
* [FIX] Fixed a false positive in Redis tests.
2.8.0
* [FIX] Fixed an error in rdbWriteRaw() that should have no practical impact.
* [NEW] Log the new master when SLAVEOF command is used.
* [NEW] Sentinel code synchronized with the unstable branch, the new Sentinel
is a reimplementation that uses more reliable algorithms.
2.8.0 RC6
* [NEW] SCAN, SSCAN, HSCAN, ZSCAN commands.
2.8.0 RC5
* [FIX] redis-cli: don't crash with --bigkeys when the key no longer exist.
* [FIX] Allow AUTH / PING when disconnected from slave and serve-stale-data
is no.
* [FIX] PSYNC: safer handling of PSYNC requests with offsets in the future.
* [FIX] Replication: Fix master timeout detection.
* [FIX] Replication: Correctly install the write handler after successful
PSYNC.
2.8.0 RC4
* [FIX] Fixed a serious EVAL memory leak in the Lua stack.
* [FIX] Fixed server startup when no IPv6 address exists in any interface.
* [FIX] Send MISCONFIG error when BGSAVE fails because can't fork.
* [FIX] Memory efficiency with large (> a few kbytes) values improved
considerably.
* [NEW] DEBUG SDSLEN for sds memory debugging.
2.8.0 RC3
* [FIX] Improved expired keys collection algorithm. Even under heavy load keys
to be expired can't accumulate because of lack of CPU time.
* [FIX] Replication speed regression fixed (issue #1238).
* [FIX] Fixed an hard to trigger PSYNC bug.
* [FIX] Fixed Issue #1240, ZUNIONSTORE could lead to wrong result.
* [NEW] Add per-db average TTL information in INFO output.
* [NEW] redis-benchmark improvements.
* [NEW] dict.c API wrong usage detection.
2.8.0 RC2
* [FIX] Fixed a critical replication bug, see issue #1221.
* [NEW] The new inline protocol now accepts quoted strings like, for example
you can now type in a telnet session: set 'foo bar' "hello world\n".
2.8.0 RC1
* [NEW] Slaves are now able to partially resynchronize with the master,
so most of the times a full resynchronization with the RDB creation
in the master side is not needed when the master-slave link is
disconnected for a short amount of time.
* [NEW] Experimental IPv6 support.
* [NEW] Slaves explicitly ping masters now, a master is able to detect
a timed out slave independently.
* [NEW] Masters can stop accepting writes if not enough slaves with a given
maximum latency are connected.
* [NEW] Keyspace changes notifications via Pub/Sub.
* [NEW] CONFIG SET maxclients is now available.
* [NEW] Ability to bind multiple IP addresses.
* [NEW] Set process names so that you can recognize, in the "ps" command
output, the listening port of an instance, or if it is a saving child.
* [NEW] Automatic memory check on crash.
* [NEW] CONFIG REWRITE is able to materialize the changes in the configuration
operated using CONFIG SET into the redis.conf file.
* [NEW] More NetBSD friendly code base.
* [NEW] PUBSUB command for Pub/Sub introspection capabilities.
* [NEW] EVALSHA can now be replicated as such, without requiring to be
expanded to a full EVAL for the replication link.
* [NEW] Better Lua scripts error reporting.
* [NEW] SDIFF performance improved.
* [FIX] A number of bugfixes.
2.6.17
* [FIX] redis-cli: fix big keys search when the key no longer exist.
* [FIX] Allow AUTH / PING when disconnected from slave with serve-stale-data
on.
* [FIX] redis-benchmark: update help for new __rand_int__ form.
* [FIX] Fix broken rdbWriteRaw() return value check in rdb.c (harmless).
* [FIX] Log to what master a slave is going to connect to.
* [FIX] Only run the fast active expire cycle if master & enabled.
* [FIX] Fixed a replication bug involving 32 bit instances and big datasets
hard to compress that resulted into more than 2GB of RDB file sent.
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Redis is a persistent key-value database with built-in net interface
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