Prevent a spurious +sdown event on switch.

[redis.git] / 00-RELEASENOTES

diff --git a/00-RELEASENOTES b/00-RELEASENOTES
index b10f54523dd4682fff61e341ee674e5e7e2b0949..12f1e3d1862da41183cb109e97be2f3d42bfe86c 100644 (file)
--- a/00-RELEASENOTES
+++ b/00-RELEASENOTES
@@ -1,36 +1,120 @@
 Redis 2.6 release notes
 Redis 2.6 release notes

+=======================

 
 

-Migrating from 2.4 to 2.6
-=========================
+** IMPORTANT ** Check the 'Migrating from 2.4 to 2.6' section at the end of
+                this file for information about what changed between 2.4 and
+                2.6 and how this may affect your application.

 
 

-Redis 2.4 is mostly a strict subset of 2.6. However there are a few things
-that you should be aware of:
+--------------------------------------------------------------------------------
+Upgrade urgency levels:

 
 

-* You can't use .rdb and AOF files generated with 2.6 into a 2.4 instance.
-* 2.4 slaves can be attached to 2.6 masters, but not the contrary, and only
-  for the time needed to perform the version upgrade.
+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.
+--------------------------------------------------------------------------------

 
 

-There are also a few API differences, that are unlikely to cause problems,
-but it is better to keep them in mind:
+---[ Redis 2.5.13 (2.6 Release Candidate 7) ]
+
+UPGRADE URGENCY: HIGH
+
+* [BUGFIX]   Theoretical bug in ziplist fixed.
+* [BUGFIX]   Better out of memory handling (Log produced in log file).
+* [BUGFIX]   Incrementally flush RDB file on slave side while performing the
+             first synchronization with the master. This makes Redis less
+             blocking in environments where disk I/O is slow.
+* [BUGFIX]   Don't crash with Lua's redis.call() without arguments.
+* [BUGFIX]   Don't crash after a big number of Lua calls on 32 bit systems
+             because of a failed assertion.
+* [BUGFIX]   Fix SORT behaviour when called from scripting.
+* [BUGFIX]   Adjust slave PING period accordingly to REDIS_HZ define.
+* [BUGFIX]   BITCOUNT: fix crash on overflowing arguments.
+* [BUGFIX]   Return an error when SELECT argument is not an integer.
+* [BUGFIX]   Blocking operations on lists were completely reimplemented for
+             correctness. Now blocking list ops and pushes originated from
+             Lua scripts will play well together and will be replicated
+             and transmitted to the AOF correctly.
+* [IMPROVED] Send async PING before starting replication to avoid blocking if
+             master allows us to connect but it is actually not able to reply.
+* [IMPROVED] Support slave-priority for Redis Sentinel.
+* [IMPROVED] Hiredis library updated.
+
+---[ Redis 2.5.12 (2.6 Release Candidate 6) ]
+
+UPGRADE URGENCY: MODERATE.
+
+* [BUGFIX]   Fixed a timing attack on AUTH (Issue #560).
+* [BUGFIX]   Don't assume that "char" is signed.
+* [BUGFIX]   Check that we have connection before enabling pipe mode.
+* [BUGFIX]   Use the optimized version of the function to convert a double to
+             its string representation. Compilation was disabled because of
+             a typo in the #if statement.
+* [IMPROVED} REPLCONF internal command introduced, now INFO shows slaves with
+             correct port numbers. This makes 2.5.12 Redis Sentinel compatible.
+* [IMPROVED] Truncate short write from the AOF for a cleaner restart. On short
+             writes (for instance out of space) Redis will now try to remove
+             the half-written data so that the next restart will work without
+             the need for the "redis-check-aof" utility.
+* [IMPROVED] New in INFO: aof_last_bgrewrite_status
+* [IMPROVED] Allow Pub/Sub in contexts where other commands are blocked.
+* [BUGFIX]   mark fd as writable when EPOLLERR or EPOLLHUP is returned by
+             epoll_wait.
+
+---[ Redis 2.5.11 (2.6 Release Candidate 5) ]
+
+UPGRADE URGENCY: HIGH.
+
+* [BUGFIX]   Fixed Hash corruption when loading an RDB file generated by
+             previous versions of Redis that encoded hashes using
+             a different ziplist encoding format for small integers.
+             All the fileds that are integers in the range 0-255 may not
+             be recognized, or duplicated un updates, causing a crash
+             when the ziplist is converted to a real hash. (Issue #547).
+* [BUGFIX]   Fixed the count of memory used by output buffers in the
+             setDeferredMultiBulkLength() function.
+
+---[ Redis 2.5.10 (2.6 Release Candidate 4) ]
+
+UPGRADE URGENCY: HIGH.
+
+* [BUGFIX]   Allow PREFIX to be overwritten on "make install".
+* [BUGFIX]   Run the test with just one client if the computer is slow.
+* [BUGFIX]   Event port support in our event driven libray.
+* [BUGFIX]   Jemalloc updated to 3.0.0. This fixes a possibly AOF rewrite issue.
+             See https://github.com/antirez/redis/issues/504 for info.
+* [BUGFIX]   Fixed issue #516: ZINTERSTORE / ZUNIONSTORE with mixed sets/zsets.
+* [BUGFIX]   Set fd to writable when poll(2) detects POLLERR or POLLHUP event.
+* [BUGFIX]   Fixed RESTORE hash failure (Issue #532).
+* [IMPROVED] Allow an AOF rewrite buffer > 2GB (Related to issue #504).
+* [IMPROVED] Server cron function frequency is now configurable (REDIS_HZ).
+* [IMPROVED] Better, less blocking expired keys collection algorithm.
+* [FEATURE]  New commands: BITOP and BITCOUNT.
+* [FEATURE]  redis-cli --pipe for mass import.
+
+What's new in Redis 2.5.9 (aka 2.6 Release Candidate 3)
+=======================================================

 
 

-* SORT now will refuse to sort in numerical mode elements that can't be parsed
-  as numbers.
-* EXPIREs now all have millisecond resolution (but this is very unlikely to
-  break code that was not conceived exploting the previous resolution error
-  in some way.)
-* INFO output is a bit different now, and contains empty lines and comments
-  starting with '#'. All the major clients should be already fixed to work
-  with the new INFO format.
+UPGRADE URGENCY: critical, upgrade ASAP.

 
 

-Also the following redis.conf and CONFIG GET / SET parameters changed name:
+* [BUGFIX] Fix for issue #500 (https://github.com/antirez/redis/pull/500).
+           Redis 2.6-RC1 and RC2 may corrupt ziplist-encoded sorted sets
+           produced by Redis 2.4.x.
+* [BUGFIX] Fixed several bugs in init.d script.
+* [BUGFIX] syncio.c functions modified for speed and correctness. On osx
+           (and possibly other BSD-based systems) the slave would block on
+           replication to send the SYNC command when the master was not
+           available. This is fixed now, but was not affecting Linux installs.
+* Now when slave-serve-stale-data is set to yes and the master is down, instead
+  of reporting a generic error Redis replies with -MASTERDOWN.

 
 

-    * hash-max-zipmap-entries, now replaced by hash-max-ziplist-entries
-    * hash-max-zipmap-value, now replaced by hash-max-ziplist-value
-    * glueoutputbuf option was now completely removed (was deprecated)
+What's new in Redis 2.5.8 (aka 2.6 Release Candidate 2)
+=======================================================

 
 

----------
-CHANGELOG
----------
+UPGRADE URGENCY: high for all the users of the KEYS command, otherwise low.
+
+* [BUGFIX] Fix for KEYS command: if the DB contains keys with expires the KEYS
+           command may return the wrong output, having duplicated or missing
+           keys. See issue #487 and #488 on github for details.

 
 What's new in Redis 2.5.7 (aka 2.6 Release Candidate 1)
 =======================================================
 
 What's new in Redis 2.5.7 (aka 2.6 Release Candidate 1)
 =======================================================


@@ -53,8 +137,13 @@ An overview of new features and changes in Redis 2.6.x
   precision (PEXPIRE, PTTL, ...).
 * Better memory usage for "small" lists, ziplists and hashes when fields or
   values contain small integers.
   precision (PEXPIRE, PTTL, ...).
 * Better memory usage for "small" lists, ziplists and hashes when fields or
   values contain small integers.

+* Read only slaves.
+* New bit opeations: BITCOUNT and BITOP commands.

 * Clients max output buffer soft and hard limits. You can specifiy different
   limits for different classes of clients (normal,pubsub,slave).
 * Clients max output buffer soft and hard limits. You can specifiy different
   limits for different classes of clients (normal,pubsub,slave).

+* More incremental (less blocking) expired keys collection algorithm, in
+  practical terms this means that Redis is more responsive when a very
+  big number of keys expire about at the same time.

 * AOF is now able to rewrite aggregate data types using variadic commands,
   often producing an AOF that is faster to save, load, and is smaller in size.
 * Every redis.conf directive is now accepted as a command line option for the
 * AOF is now able to rewrite aggregate data types using variadic commands,
   often producing an AOF that is faster to save, load, and is smaller in size.
 * Every redis.conf directive is now accepted as a command line option for the


@@ -86,6 +175,46 @@ An overview of new features and changes in Redis 2.6.x
 * Better support for big endian and *BSD systems.
 * Build system improved.
 
 * Better support for big endian and *BSD systems.
 * Build system improved.
 

+Migrating from 2.4 to 2.6
+=========================
+
+Redis 2.4 is mostly a strict subset of 2.6. However there are a few things
+that you should be aware of:
+
+* You can't use .rdb and AOF files generated with 2.6 into a 2.4 instance.
+* 2.6 slaves can be attached to 2.4 masters, but not the contrary, and only
+  for the time needed to perform the version upgrade.
+
+There are also a few API differences, that are unlikely to cause problems,
+but it is better to keep them in mind:
+
+* SORT now will refuse to sort in numerical mode elements that can't be parsed
+  as numbers.
+* EXPIREs now all have millisecond resolution (but this is very unlikely to
+  break code that was not conceived exploting the previous resolution error
+  in some way.)
+* INFO output is a bit different now, and contains empty lines and comments
+  starting with '#'. All the major clients should be already fixed to work
+  with the new INFO format.
+* Slaves are only read-only by default (but you can change this easily
+  setting the "slave-read-only" configuration option to "no" editing your
+  redis.conf or using CONFIG SET.
+
+The following INFO fields were renamed for consistency:
+
+     changes_since_last_save -> rdb_changes_since_last_save
+     bgsave_in_progress -> rdb_bgsave_in_progress
+     last_save_time -> rdb_last_save_time
+     last_bgsave_status -> rdb_last_bgsave_status
+     bgrewriteaof_in_progress -> aof_rewrite_in_progress
+     bgrewriteaof_scheduled -> aof_rewrite_scheduled
+
+The following redis.conf and CONFIG GET / SET parameters changed:
+
+    * hash-max-zipmap-entries, now replaced by hash-max-ziplist-entries
+    * hash-max-zipmap-value, now replaced by hash-max-ziplist-value
+    * glueoutputbuf option was now completely removed (was deprecated)
+

 --------------------------------------------------------------------------------
 
 Credits: Where not specified the implementation and design are done by
 --------------------------------------------------------------------------------
 
 Credits: Where not specified the implementation and design are done by