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Memcached 1.3.3 Release Notes
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                  Memcached 1.3 Beta 3 Release Notes
                  ==================================
 
Date: 2009-04-03 Fri
 
 
Table of Contents
=================
1 Download
2 Features
    2.1 Can set listen backlog on the commandline.
    2.2 stats settings
3 Bug fixes
4 Misc
5 Stable fixes from Dormando
    5.1 New Stats
        5.1.1 accepting_conns
        5.1.2 listen_disabled_num
        5.1.3 cmd_flush
    5.2 missing key debugging
    5.3 tail repair
    5.4 socket listen bugs
6 Contributors
 
 
1 Download
~~~~~~~~~~~
 
Download Link:
 
http://memcached.googlecode.com/files/memcached-1.3.3.tar.gz
 
2 Features
~~~~~~~~~~~
 
2.1 Can set listen backlog on the commandline.
===============================================
 
Prevent connection refused during connection storms at the cost of
kernel memory.
 
2.2 stats settings
===================
 
Show all current server settings (useful for troubleshooting as well
as internal verification).
 
3 Bug fixes
~~~~~~~~~~~~
- Alignment bug in binary stats (bug26)
- Occasional buffer overflow in stats (bug27)
- Try to recycle memory more aggressively. (bug14)
- incr validation (bug31)
- 64-bit incr/decr delta fixes (bug21)
- ascii UDP set (bug36)
- stats slabs' used chunks (bug29)
- stats reset should reset item stats, eviction counters, etc... (bug22)
- Fix all stat buffer management
 
4 Misc
~~~~~~~
- More tests
- More/better documentation
- Code cleanup
 
5 Stable fixes from Dormando
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
5.1 New Stats
==============
 
5.1.1 accepting_conns
----------------------
 
1 or 0 to indicate whether the server is currently accepting
connections or not.
 
The server will stop accepting connections when it has as many as it's
configured to take.
 
5.1.2 listen_disabled_num
--------------------------
 
The number of times socket listeners were disabled due to hitting the
connection limit.
 
5.1.3 cmd_flush
----------------
 
The number of times the flush command was issued.
 
5.2 missing key debugging
==========================
 
With verbosity enabled, you can see *why* objects were not found.  In
many cases, an item exists under a given key, but is considered
invalid due to lazy expiration or flush.
 
5.3 tail repair
================
 
There is a rare, unidentified reference leak that causes a slab to be
full of invalid objects that cannot be evicted via the LRU nor will
they expire on their own.
 
Tail repair is a strategy by which we forcefully evict objects that
are marked as ``in-use'' (that is, in-flight or otherwise being used),
but haven't been accessed in a long time (currently three hours).
 
There is an additional stat that comes along with this (tailrepairs on
a slab) that will allow you to detect that this condition has occurred
on one of your slabs.
 
5.4 socket listen bugs
=======================
 
There were some issues listening to sockets on machines with different
network interface configurations (i.e. no network, only ipv4, only
ipv6, etc...).
 
6 Contributors
~~~~~~~~~~~~~~~
 
The following people contributed to this release since 1.3.2.  Please
refer to the 1.3.2 release notes for more info:
 
http://code.google.com/p/memcached/wiki/ReleaseNotes132
 
    28  Dustin Sallings
     8  Trond Norbye
     6  dormando
     5  Brad Fitzpatrick
     4  Steve Yen
     1  Eric Lambert
     1  Clinton Webb
     1  Chris Goffinet