00-RELEASENOTES

   1 Redis 2.6 release notes
   2
   3 Migrating from 2.4 to 2.6
   4 =========================
   5
   6 Redis 2.4 is mostly a strict subset of 2.6.
   7 The only thing you should be aware is that you can't use .rdb and AOF files
   8 generated with 2.4 into a 2.2 instance.
   9
  10 2.4 slaves can be attached to 2.2 masters, but not the contrary, and only for
  11 the time needed to perform the version upgrade.
  12
  13 From the point of view of the API Redis 2.4 only adds new commands
  14 (other commands now accepts a variable number of arguments) so you don't need
  15 to modify your program in order to use Redis 2.4.
  16
  17 However there are a few semantical differences that you should be aware of:
  18
  19 * SORT now will refuse to sort in numerical mode elements that can't be parsed
  20   as numbers.
  21 * EXPIREs now all have millisecond resolution (but this is very unlikely to
  22   break code that was not conceived exploting the previous resolution error
  23   in some way.)
  24 * INFO output is a bit different now, and contains empty lines and comments
  25   starting with '#'.
  26
  27 ---------
  28 CHANGELOG
  29 ---------
  30
  31 What's new in Redis 2.6.0
  32 =========================
  33
  34 UPGRADE URGENCY: We suggest new users to start with 2.6.0, and old users to
  35                  upgrade after some testing of the application with the new
  36                  Redis version.
  37
  38 * Server side Lua scripting, see http://redis.io/commands/eval
  39 * Virtual Memory removed (was deprecated in 2.4)
  40 * Hardcoded limits about max number of clients removed.
  41 * AOF low level semantics is generally more sane, and especially when used
  42   in slaves.
  43 * Milliseconds resolution expires, also added new commands with milliseconds
  44   precision (PEXPIRE, PTTL, ...).
  45 * Clinets max output buffer soft and hard limits. You can specifiy different
  46   limits for different classes of clients (normal,pubsub,slave).
  47 * AOF is now able to rewrite aggregate data types using variadic commands,
  48   often producing an AOF that is faster to save, load, and is smaller in size.
  49 * Every redis.conf directive is now accepted as a command line option for the
  50   redis-server binary, with the same name and number of arguments.
  51 * Hash table seed randomization for protection against collisions attacks.
  52 * Performances improved when writing large objects to Redis.
  53 * Significant parts of the core refactored or rewritten. New internal APIs
  54   and core changes allowed to develop Redis Cluster on top of the new code,
  55   however for 2.6 all the cluster code was removed, and will be released with
  56   Redis 3.0 when it is more complete and stable.
  57 * Redis ASCII art logo added at startup.
  58 * Crash report on memory violation or failed asserts improved significantly
  59   to make debugging of hard to catch bugs simpler.
  60 * redis-benchmark improvements: ability to run selected tests,
  61   CSV output, faster, better help.
  62 * redis-cli improvements: --eval for comfortable development of Lua scripts.
  63 * SHUTDOWN now supports two optional arguments: "SAVE" and "NOSAVE".
  64 * INFO output split into sections, the command is now able to just show
  65   pecific sections.
  66 * New statistics about how many time a command was called, and how much
  67   execution time it used (INFO commandstats).
  68 * More predictable SORT behavior in edge cases.
  69 * INCRBYFLOAT and HINCRBYFLOAT commands.
  70
  71 --------------------------------------------------------------------------------
  72
  73 Credits: Where not specified the implementation and design are done by
  74 Salvatore Sanfilippo and Pieter Noordhuis. Thanks to VMware for making all
  75 this possible. Also many thanks to all the other contributors and the amazing
  76 community we have.
  77
  78 See commit messages for more credits.
  79
  80 Cheers,
  81 Salvatore