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2015-09-01 Cache Team <>
* twemcache: version 2.6.2 release
* Feature: adding "config maxbytes" command to adjust heap
* Feature: adding socket, memory, and context switch related stats
* Feature: adding max reporting for all gauges
* Fix: port signal handler patch from twemproxy
* Fix: update item_expire for flushed items
* Fix: updating settings.verbose when verbosity level changes
* Fix: adding long option form of -e
* Misc: changing default number of workers from 4 to 2
* Misc: downsizing default connection buffer
* Misc: lower ac requirements; making -rdynamic linux only
* Misc: added coverage support; for instructions
2013-06-04 Cache Team <>
* twemcache: version 2.6.0 release
* Fix: memory leak in suffix, with contribution from @ferlatum & @skuzmich
* Fix: mc_cache create using the right parameter now (credit to @haipome)
* Fix: wrong assertion crippling debug version of binary
* Fix: UDP packet using 100% CPU (backported by @cloudflare)
* Feature: adding separate metrics to track get* commands and get* keys
* Feature: adding appendrl and prepend rl command to return data length
* Cleanup: avoiding allocating item/slab magic when assert is not used
* Cleanup: stats cleanup within the item & command processing modules
* Cleanup: refactoring of the interfaces between mc_items.* and mc_ascii.*
* Misc: help information now displays in Unix style
2012-12-11 Cache Team <>
* twemcache: version 2.5.3 release
* Fix: insufficient item length causing segfault
* Fix: get/delete race causing segfault
* Fix: inconsistency in prepend/append replies under concurrency
* Fix: update cas for in-place prepend/append
* Fix: strtoull function taking length as a parameter to avoid overrun
* Debug: memory-scrubbing enabled in full debug build
* Misc: soarpenguin's several from
2012-09-24 Cache Team <>
* twemcache: version 2.5.2 release
* Feature: command line option for klog sampling rate, default is now 100
* Fix: garbled data in suffix
* Performance: avoid all unnecessary memcpy in processing prepend/apprend
2012-09-06 Cache Team <>
* twemcache: version 2.5.1 release
* Feature: slab LRC eviction (-M 8), designed for write through cases
* Feature: auto klog rotation support, reopen after size reaches 1GB
klog is turned on if a filename is given at start time
* Feature: Backporting fixed size (-e) hash feature from memcached 1.4.8
* Cleanup: data flags and data length now stored as part of item header
* Misc: updated TODO list
2012-07-16 Cache Team <>
* twemcache: version 2.5.0 release
* Feature: slab LRU eviction (-M 4) introduced
multiple eviction strategies can now be stacked
* Fix: fix logical error of code and remove meaningless code (monadbobo)
* Misc: new notes, updated TODO list
add twctop README
2012-07-10 Cache Team <>
* twemcache: version 2.4.0 release
twemcache is the twitter memcached
* *critical bugfix*. In 1.2.7 under multithreaded mode, memcached
would never restart accepting connections after hitting the
maximum connection limit.
* Fix: Rewrote stat buffer handling (Trond)
* Feature: -b option for configuring backlog
* Feature: stats settings
* Fix: binary stat alignment bug (bug26)
* Fix: buffer overflow in stats (bug27)
* Fix: recycle memory more aggressively (bug14)
* Fix: incr validation (bug31)
* Fix: 64-bit incr/decr delta problem (bug21)
* Fix: Ascii UDP set (bug36)
* Fix: stats slabs' used chunks (bug29)
* Fix: stats reset resetting more (bug22)
* Misc: More tests, documentation, cleanliness (godliness)
* Stable merge (stats, debuggability, listen bugs)
* Protocol: Binary complete (Dustin, Trond, Toru, etc...)
* Performance: improvements from facebook (Dormando)
* Performance: per-thread stats (Trond)
* Performance: Hash expansion in its own thread (Trond)
* Stats: Lots of new stats (Dustin)
* Bug fixes (various)
See the 1.3.2 release notes or revision control for more detail.
* Display error status on listen failures (Dormando)
* Remove managed instance code. Incomplete/etc. (Dormando)
* Handle broken IPV6 stacks better (Brian Aker)
* Generate warnings on setsockopt() failures (Brian Aker)
* Fix some indentation issues (Brian Aker)
* UDP/TCP can be disabled by setting their port to zero (Brian Aker)
* Zero out libevent thread structures before use (Ricky Zhou)
* New stat: Last accessed time for last evicted item per slab class.
* Use a dedicated socket accept thread (Facebook)
* Add -R option. Limit the number of requests processed by a connection
at once. Prevents starving other threads if bulk loading. (Facebook)
2008-07 [Version 1.2.6 released]
2008-07-24 [Version 1.2.6-rc1 released]
* Add support for newer automake (Facebook)
* DTrace support for Solaris/etc (Trond Norbye)
* LRU tests (Steve Yen)
* Handle negative length items properly (Dormando)
* Don't leave stale data after failed set attempts (Dormando)
* Fix refcount leaks, which would result in OOM's on all sets
* Fix buffer overruns (Dustin Sallings, Tomash Brechko)
* Fix memory corruption with CAS (Dustin Sallings)
* Fix -k to work with -d. (reported by Gary Zhu)
2008-03-02 [Version 1.2.5-rc1 released]
* Add per-item-class tracking of evictions and OOM errors (dormando)
* Optimize item_alloc() a little (dormando)
* Give 'SERVER_ERROR out of memory' errors more context (dormando)
* Enable usage of large memory pages under solaris
* Enable UDP by default, clean up server socket code
* 'noreply' support (Tomash Brechko)
* IPv6 support, and IPv6 multi-interface support (
* Add compiler options for Sun Studio compilers with --enable-threads
* Add --enable-64bit for mulitarget platforms (Trond.Norbye@Sun.COM)
* Use gettimeofday(2) instead of time(2).
* Make -k option work (Tomash Brechko)
* Fix chunk slab alignment (Trond.Norbye@Sun.COM)
2007-12-06 [Version 1.2.4 released]
* Fix compilation on panther (JS and Dormando)
* More CAS tests (Chris Goffinet)
* Final fixes for all 1.2.4 features are in, -rc2 sent out.
2007-11-19 [Version 1.2.4-rc1 released]
2007-11-19 Dormando <>
* Patch series from Tomash Brechko <>:
Minor fixes and optimisations.
* Patches from Chris, Dustin, and Dormando to fix CAS.
* Prepping for 1.2.4 release.
2007-11-13 Dormando <>
* Adjusted patch from js <>: Compile on OS X Panther
and earlier.
2007-11-12 Steven Grimm <>
* Patch from Tomash Brechko <>: Always send
"SERVER_ERROR out of memory" when memory exhausted.
2007-10-15 Paul Lindner <>
* Patch from David Bremner <> that implements
a new option "-a" which takes an octal permission mask
(like chmod) sets the permissions on the unix domain socket
(specified by "-s").
2007-10-03 Paul Lindner <>
* Incorporate "cas" operation developed by Dustin
Sallings <> This change allows you
to do atomic changes to an existing key.
* Fix for stats.evictions not incrementing
when exptime == 0 items are kicked off the cache.
from Jean-Francois BUSTARRET <>.
* Fix for do_item_cachedump() which was returning
an incorrect timestamp.
* Switch to unsigned 64-bit increment/decrement counters
from Evan Miller and Dustin Sallings.
* Add append command support written by Filipe Laborde.
Thread safe version plus prepend command from Maxim Dounin
* The memcached-tool script can now display stats. Patch
provided by Dan Christian <>
* Fix for Unix Domain sockets on FreeBSD
FreeBSD's sendmsg() requires msg_name in msghdr structure
to be NULL if not used, setting msg_namelen to 0 isn't enough.
Patch from Maxim Dounin <>
2007-08-21 Paul Lindner <>
* Incorporate incrememnt patch from Evan Miller
<> to define increment overflow
2007-08-07 Leon Brocard <>
* Bring the memcached.1 manpage up to date
2007-08-06 Paul Lindner <>
* Fix crash when using -P and -d flags on x86_64
with latest libevent release.
2007-07-08 Steven Grimm <>
* Item stats commands weren't thread-safe; wrap them with locks
when compiled in multithreaded mode.
* The "stats items" command now works again; it broke with the
introduction of the powers-of-N chunk size change.
2007-07-06 [Version 1.2.3 released]
2007-06-19 Paul Lindner <>
* Solaris portability fixes from Trond Norbye
2007-05-29 Paul Lindner <>
* Properly document evictions statistic value
2007-05-10 Paul Lindner <>
* Flesh out tests for unix domain sockets and binary data.
* Update rpm spec file to run tests
2007-05-07 Paul Lindner <>
* Fix compilation bug on freebsd 6.x (and maybe others)
* Update RPM spec file per redhat bugzilla #238994
* Move unistd.h to memcached.h to get rid of warnings
* Add string.h to thread.c to get correctly prototyped strerror()
2007-05-04 Paul Lindner <>
* Add fedora/redhat style init script and RPM spec file
2007-05-12 [Version 1.2.2 released]
2007-04-16 Steven Grimm <>
* Command tokenizer performance and cleanliness improvement.
Patch contributed by Paolo Borelli <>.
2007-04-16 Paul Lindner <>
* Add notes to README about MacOS, libevent and kqueue.
* Windows Patch integration -- part 1, warnings elimination.
2007-04-12 Paul Lindner <>
* Allow changes to the verbosity level of the server with a new
"verbosity" command and some compiler cleanups.
Patch contributed by Paolo Borelli <>.
2007-04-08 Paul Lindner <>
* Add cleanup patch from "Tim Yardley" <> to
clean up source spacing issues, fix -Wall warnings, add some
null checks, adds asserts at the top of each function for any
use of conn *c without checking to see if c is NULL first.
* Also adjust to clean *.ac files. Add
script to test-suite to test for tabs.
2007-04-04 Paul Lindner <>
* Add clarification of flush_all in the protocol docs
from Elizabeth Mattijsen <>
2007-03-31 Paul Lindner <>
* Add patch from Eli Bingham <> to
re-enable the -n switch to memcached.
2007-03-20 Paul Lindner <>
* Add patch to collect eviction statistics from
Jean-Francois BUSTARRET <>.
* Updated docs, added new test cases for t/stats.t
2007-03-18 Paul Lindner <>
* Add more test cases using larger buffer sizes up to and greater
than 1MB.
* Remove unused parameter to item_size_ok()
* Use a single printf() in usage()
* Add a failing test for conforming with maximum connections.
* crash fix from Thomas van Gulick <> in
conn_shrink(), passing &ptr, instead of ptr to realloc().
2007-03-05 Paul Lindner <>
* Fix a number of places where (s)printf calls were using unsigned
or signed formats that did not match their arguments.
* Add support for stdbool.h and stdint.h to use the bool and
uint8_t types.
* Major refactoring - move API calls for assoc/items/slabs to
their own individual header files. Add apropriate const and
static declarations as appropriate.
* Avoid type-punning. Do a more efficient realloc inside the
conn_shrink routine.
* Fix overflow bug where uninitialized access to slabclass caused
size-0 mallocs during slab preallocation.
* Convert some sprintf calls to snprintf to protect against
buffer overflows.
* Explicitly compare against NULL or zero in many places.
* Steven Grimm <>: Per-object-type stats collection
support. Specify the object type delimiter with the -D command line
option. Turn stats gathering on and off with "stats detail on" and
"stats detail off". Dump the per-object-type details with
"stats detail dump".
* Steven Grimm <>: Fix an off-by-one error in the
multithreaded version's message passing code.
* Fix expirations of items set with absolute expiration times in
the past, before the server's start time. bug was introduced in
1.2.0 with rel_time_t. Thanks to Adam Dixon
<> for the bug report and test case!
* Steven Grimm <>: Performance improvements:
Dynamic sizing of hashtable to reduce collisions on very large
caches and conserve memory on small caches.
Only reposition items in the LRU queue once a minute, to reduce
overhead of accessing extremely frequently-used items.
Stop listening for new connections until an existing one closes
if we run out of available file descriptors.
Command parser refactoring: Add a single-pass tokenizer to cut
down on string scanning. Split the command processing into
separate functions for easier profiling and better readability.
Pass key lengths along with the keys in all API functions that
need keys, to avoid needing to call strlen() repeatedly.
* Steve Peters <>: OpenBSD has a malloc.h,
but warns to use stdlib.h instead
* Steven Grimm <>: Add support for multithreaded
execution. Run configure with "--enable-threads" to enable. See
doc/threads.txt for details.
* Iain Wade <>: Fix for UDP responses on non-"get"
* Steven Grimm <>: Dynamic sizing of hashtable to
reduce collisions on very large caches and conserve memory on
small caches.
* Steven Grimm <>: New faster hash function.
* don't listen on UDP by default; more clear message when UDP port in use
* release 1.2.0 (along with 1.1.13, which is the more tested branch)
nobody has run 1.2.0 in production, to my knowledge. facebook has run
their pre-merge-with-trunk version, but bugs were discovered (and fixed)
after the merge. there might be more. you've been warned. :)
* improved autoconf libevent detection, from the Tor project.
* test suite and lot of expiration, delete, flush_all, etc corner
case bugs fixed (Brad Fitzpatrick)
* Nathan Neulinger <>: fix breakage in expiration code
causing expiration times to not be processed correctly.
* Nathan Neulinger <>: fix incompatabilities with
unix domain socket support and the UDP code and clean up stale
* Nathan Neulinger <>: unix domain socket support
* Steven Grimm <>: big bunch of changes:
big CPU reduction work, UDP-based interface, increased memory
efficiency. (intertwined patch, committed all together)
or see svn commit logs
* River Tarnell: autoconf work for Solaris 10. Brad:
merge and verify it works on Nexenta.
* avva: bucket/generation patch (old, but Brad's just finally
committing it)
* Brad Fitzpatrick <>: allocate 1 slab per class
on start-up, to avoid confusing users with out-of-memory errors
later. this is 18 MB of allocation on start, unless max memory
allowed with -m is lower, in which case only the smaller slab
classes are allocated.
* Elizabeth Mattijsen <>: needed a way to flush all
memcached backend servers, but not at exactly the same time (to
reduce load peaks), I've added some simple functionality to the
memcached protocol in the "flush_all" command that allows you to
specify a time at which the flush will actually occur (instead of
always at the moment the "flush_all" command is received).
* patch from Peter van Dijk <> to make
stderr unbuffered, for running under daemontools
* patch from Don MacAskill <> 'flush_all' doesn't
seem to work properly. Basically, if you try to add a key which
is present, but expired, the store fails but the old key is no
longer expired.
* release 1.1.12
* Date: Thu, 18 Nov 2004 15:25:59 -0600
From: David Phillips <>
Here is a patch to and to put the man page in
the correct location. Trying to install the man page from a
subdirectory results in the subdirectory being used in the install
path (it tries to install to doc/memcached.1). This is the correct
thing to do:
- create a in the doc directory that installs the man page
with man_MANS
- modify in the base directory to reference the doc
directory using SUBDIRS
- modify the AC_CONFIG_FILES macro in to output the
Makefile in doc
* pidfile saving support from Lisa Seelye <>, sent
Jan 13, 2005
* don't delete libevent events that haven't been added (the deltimer)
patch from Ted Schundler <>
* document -M and -r in manpage (Doug Porter <>)
* fix buffer overflow in items.c with 250 byte keys along with
other info on the same line going into a 256 byte char[].
thanks to Andrei Nigmatulin <>
* immediate deletes weren't being unlinked a few seconds,
preventing "add" commands to the same key in that time period.
thanks to Michael Alan Dorman <> for the
bug report and demo script.
* released 1.1.11
* Avva: Add a new command line option: -r , to maximize core file
* Avva: Use getrlimit and setrlimit to set limits for number of
simultaneously open file descriptors. Get the current limits and
try to raise them if they're not enough for the specified (or the
default) setting of max connections.
* Adds a '-M' flag to turn off tossing items from the cache.
(Jason Titus <>)
2004-02-19 (Evan)
* Install manpage on "make install", etc.
2003-12-30 (Brad)
* remove static build stuff. interferes with PAM setuid stuff
and was only included as a possible fix with the old memory
allocator. really shouldn't make a difference.
* add Jay Bonci's Debian scripts and manpage
* release version 1.1.10
2003-12-01 (Avva)
* New command: flush_all, causes all existing items to
be invalidated immediately (without deleting them from
memory, merely causing memcached to no longer return them).
* Shift init code around to fix daemon mode on FreeBSD,
* and drop root only after creating the server socket (to
* allow the use of privileged ports)
* version 1.1.10pre
* BSD compile fixes from Ryan T. Dean
* version 1.1.9
* ignore SIGPIPE at start instead of crashing in rare cases it
comes up. no other code had to be modified, since everything
else is already dead-connection-aware. (avva)
2003-09-09 (Avva, Lisa Marie Seelye <>)
* setuid support
2003-09-05 (Avva)
* accept all new connections in the same event (so we work with ET epoll)
* mark all items as clsid=0 after slab page reassignment to please future
asserts (on the road to making slab page reassignment work fully)
2003-08-12 (Brad Fitzpatrick)
* use TCP_CORK on Linux or TCP_PUSH on BSD
* only use TCP_NODELAY when we don't have alternatives
* disable Nagel's Algorithm (TCP_NODELAY) for better performance (avva)
* support multiple levels of verbosity (-vv)
2003-08-10 (Evan Martin)
* debug, optimization, and static flags are controlled
by the configure script.
- allow specifying libevent directory with --with-libevent=DIR
- check for malloc.h (unavailable on BSDs)
- check for socklen_t (unavailable on OSX)
* assoc.c, items.c, slabs.c: Remove some unused headers.
* memcached.c: allow for nonexistence of malloc.h; #define a POSIX
macro to import mlockall flags.
* version 1.1.7
* big bug fix: item exptime 0 meant expire immediately, not never
* version 1.1.8
* make 'delete' take second arg, of time to refuse new add/replace
* set/add/replace/delete can all take abs or delta time (delta can't
be larger than a month)
* added doc/protocol.txt
* report CPU usage in stats
* version 1.1.6
* fix a number of obscure bugs
* more stats reporting
* removing use of Judy; use a hash. (judy caused memory fragmentation)
* shrink some structures
* security improvements
* version 1.1.0
* changing maxsize back to an unsigned int
* adding PHP support
* added CONTRIBUTORS file
* version 1.0.4
* forgot to distribute website/api (still learning auto*)
* version 1.0.3
* update to version 1.0.2
* autoconf/automake fixes for older versions
* make stats report version number
* change license from GPL to BSD
Fri, 13 Jun 2003 10:05:51 -0700 Evan Martin <>
*,, Use autotools.
* items.c, memcached.c: #include <time.h> for time(),
printf time_t as %lu (is this correct?),
minor warnings fixes.