redis/00-RELEASENOTES

Redis 2.8 release notes
=======================

** IMPORTANT ** Check the 'Migrating from 2.6 to 2.8' section at the end of
                this file for information about what changed between 2.6 and
                2.8 and how this may affect your application.

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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.
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--[ Redis 2.8 Release Candidate 1 (2.7.101) ] Release date: 18 Jul 2013

This is the first release candidate of Redis 2.8 (official version is 2.7.101).

The following is a list of improvements in Redis 2.8, compared to Redis 2.6.

* [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.

Migrating from 2.6 to 2.8
=========================

Redis 2.6 is mostly a strict subset of 2.8. However there are a few things
that you should be aware of:

The following commands changed behavior:

    * SORT with ALPHA now sorts according to local collation locale if no STORE
      option is used.
    * ZADD/ZINCRBY are now able to accept a bigger range of values as valid
      scores, that is, all the values you may end having as a result of
      calling ZINCRBY multiple times.
    * Many errors are now prefixed by a more specific error code instead of
      the generic -ERR, for example -WRONGTYPE, -NOAUTH, ...
    * PUBLISH called inside Lua scripts is now correctly propagated to slaves.

The following redis.conf and CONFIG GET / SET parameters changed:

    * logfile now uses the empty string in order to log to standard output,
      so 'logfile stdout' is now invalid, use 'logfile ""' instead.

The following INFO fields changed format in a non-backward compatible way:

    * The list of slaves in INFO is now in field=value format.

Replication:

    Redis 2.8 can be used as slave for Redis 2.6, but doing this is only
    a good idea for the short amount of time needed to upgrade your servers.
    We suggest to update both master and slaves at about the same time.

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Credits: Where not specified the implementation and design is done by
Salvatore Sanfilippo. Thanks to VMware and Pivotal for making all
this possible. Also many thanks to all the other contributors and the amazing
community we have.

See commit messages for more credits.

Cheers,
Salvatore