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Redis 6.0 release notes
=======================
--------------------------------------------------------------------------------
Upgrade urgency levels:
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.
--------------------------------------------------------------------------------
================================================================================
Redis 6.0 RC1 Released Thu Dec 19 09:58:24 CEST 2019
================================================================================
Upgrade urgency LOW: This is the first RC of Redis 6.
Introduction to the Redis 6 release
===================================
Redis 6 improves Redis in a number of key areas and is one of the largest
Redis releases in the history of the project, so here we'll list only
the biggest features in this release:
* The modules system now has a number of new APIs that allow module authors
to make things otherwise not possible in the past. It is possible to
store arbitrary module private data in RDB files, to hook on different
server events, capture and rewrite commands executions, block clients on
keys, and so forth.
* The Redis active expire cycle was rewritten for much faster eviction of keys
that are already expired. Now the effort is tunable.
* Redis now supports SSL on all channels.
* ACL support, you can define users that can run only certain commands and/or
can only access only certain keys patterns.
* Redis now supports a new protocol called RESP3, which returns more
semantical replies: new clients using this protocol can understand just
from the reply what type to return to the calling program.
* There is server-side support for client-side caching of key values. This
feature is still experimental and will get more changes during the next
release candidates, but you can already test it and read about it here:
https://redis.io/topics/client-side-caching
* Redis can now optionally use threads to handle I/O, allowing to serve
2 times as much operations per second in a single instance when
pipelining cannot be used.
* Diskless replication is now supported even on replicas: a replica is now
able, under certain conditions the user can configure, to load the RDB
in the first synchronization directly from the socket to the memory.
* Redis-benchmark now supports a Redis Cluster mode.
* SRANDMEMBER and similar commands have a better distribution.
* Redis-cli improvements.
* Systemd support rewritten.
* A Redis Cluster proxy was released here:
https://github.com/artix75/redis-cluster-proxy
* A Disque module for Redis was released here:
https://github.com/antirez/disque-module
Thanks to all the users and developers who made this release possible.
We'll follow up with more RC releases, until the code looks production ready
and we don't get reports of serious issues for a while.
A special thank you for the amount of work put into this release
(in decreasing number of commits, only listing contributors with more
than a single commit) by:
685 antirez
81 zhaozhao.zz
76 Oran Agra
51 artix
28 Madelyn Olson
27 Yossi Gottlieb
15 David Carlier
14 Guy Benoish
14 Guy Korland
13 Itamar Haber
9 Angus Pearson
8 WuYunlong
8 yongman
7 vattezhang
7 Chris Lamb
5 Dvir Volk
5 meir@redislabs.com
5 chendianqiang
5 John Sully
4 dejun.xdj
4 Daniel Dai
4 Johannes Truschnigg
4 swilly22
3 Bruce Merry
3 filipecosta90
3 youjiali1995
2 James Rouzier
2 Andrey Bugaevskiy
2 Brad Solomon
2 Hamid Alaei
2 Michael Chaten
2 Steve Webster
2 Wander Hillen
2 Weiliang Li
2 Yuan Zhou
2 charsyam
2 hujie
2 jem
2 shenlongxing
2 valentino
2 zhudacai 00228490
2 喜欢兰花山丘
Migrating from 5.0 to 6.0
=========================
Redis 6.0 is mostly a strict superset of 5.0, you should not have any problem
upgrading your application from 5.0 to 6.0. However this is a list of small
non-backward compatible changes introduced in the 6.0 release:
* The SPOP <count> command no longer returns null when the set key does not
exist. Now it returns the empty set as it should and as happens when it is
called with a 0 argument. This is technically a fix, however it changes the
old behavior.
--------------------------------------------------------------------------------
Credits: For each release, a list of changes with the relative author is
provided. Where not specified the implementation and design is done by
Salvatore Sanfilippo. Thanks to Redis Labs for making all this possible.
Also many thanks to all the other contributors and the amazing community
we have.
Commit messages may contain additional credits.
Enjoy,
Salvatore
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