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ChangeLog
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2020-03-30 [version 1.12.1]
* [FIX] Fixed memory overwrite when tokernize strings in memory blocks.
* [FIX] Added ENGINE_ENOMEM error handling where it is missed.
* [DOC] Provided the more specific explanation about stats command.
* [DOC] Added a compilation FAQ page.
* [TEST] Added tests for verifying binary bkey OUT_OF_RANGE response.
2020-03-16 [version 1.12.0]
* [FEATURE] Changed max_element_bytes(4KB=>16KB) and set configurable.
* [FIX] Added the error handling of retry when an auto scrub fails.
* [INTERNAL] Added CLOG_BTREE_ELEM_DELETE_LOGICAL macro.
* [CLEANUP] Fixed improper type specifiers and wrong response string.
* [CLEANUP] Fixed condition to decrease bucket refcount when scan ends.
* [CLEANUP] Fixed some mistakes on code comments.
* [DOC] Removed hyphen in chapter titles.
* [DOC] Removed time option in delete command.
2019-11-20 [version 1.11.8]
* [FEATURE] Dump SM info summary when "no more small memory" occurs.
* [FEATURE] Print out not absolute but the remaining exptime in key dump.
* [FIX] Fix memory leak when bad data is given in bop update.
* [ENHANCE] Increase SSL as free big slot and chunk space decreases.
* [ENHANCE] Change SM logic to alloc the smaller avail memory first.
* [ENHANCE] Use proper sized memory within engine to get coll elements.
* [ENHANCE] DO not increase refcount when allocate an element.
* [DOC] Include contribution process document.
* [CLEANUP] Do lots of code refactoring.
2019-09-26 [version 1.11.7]
* [FEATURE] Added scrub_count config command.
* [FEATURE] Reflect immediately the changed scrub_count while scrubbing.
* [ENHANCE] New scrub execution to reduce CPU usage and cache lock duration.
* [ENHANCE] Consider the number of collection elements when do scan next.
* [ENHANCE] Reduce cache lock duration when evict/reclaim collection items.
* [ENHANCE] Define and use NULL bkrange to access all elements of b+tree.
* [ENHANCE] Reduce initial size of roottable and realloc as necessary.
* [FIX] Fixed invalid memory access in trim_copy().
* [FIX] Freed the response string buffer only when it exists.
* [FIX] Fixed memory leak when getting hostname by address.
* [TEST] Added code coverage test.
* [TEST] Added lop operation test on a large list collection.
* [INTERNAL] Added functions for getting all collection elements.
* [INTERNAL] Added change log generation macros for future use.
* [CLEANUP] Fixed cppcheck's errors and warnings.
* [CLEANUP] Devided store_item() into detailed store functions.
* [CLEANUP] Used global engine pointer instead of passing engine argument.
* [CLEANUP] Refactored a lot of code for readbility and others.
2019-06-05 [version 1.11.6]
* [FEATURE] Add long query detection for map collection.
* [FEATURE] Check cache_server_mapping ZK node with hostname.
* [FIX] Incorrect ip checking when it is proxy mode.
2018-10-11 [version 1.11.5]
* [ENHANCE] Do exact search instead of full scan when do flush_prefix.
* [FEATURE} Increase HEART_BEAT_DFT_FAILSTOP. 30000 => 60000 (ms)
* [FEATURE} Increase HEART_BEAT_MAX_FAILSTOP. 60000 => 300000 (ms)
* [FEATURE} Add stat_prefixes(# of prefix stats) in stats result.
* [FEATURE} Auto-off stats detail when prefix stats count is over 10000.
* [FEATURE} Can disable mc heartbeat failstop by setting its value to 0.
2018-08-17 [version 1.11.4]
* [Fix] Fix free space mis-calculation when the last 01pct slot is freed.
* [Fix] Use free small memory if possible when sm space is short of.
* [Fix] Fix the wrong result of bop smget with unique option
when the first bkeys of some btrees are duplicate.
* [Fix] Fix the incr/decr operation on binary bkey value.
* {Enhance] Reduce "no more small memory check" messages.
* [Manual] Add description about smallest/largest_silent_trim.
* [Manual] Add description about bop incr/decr with initial value.
* [Other] Reinforce and reorganize arcus-memcached unit tests.
2018-06-07 [version 1.11.3]
* [Feature] Removed the useless attribute compatibility check in smget.
* [Feature] Forced btree overflow action for temporary use.
* [Feature] Automatic srcub stale when a new node is added.
* [Feature] Proxy support where memcached operates as a backend of it.
* [Feature] Added "cmd_cas" memcached stat and activated cas stats.
* [Feature] Increased MAX_SERVICECODE_LENGTH. 32 => 128.
* [Feature] Added MAX_HOSTNAME_LENGTH whose value is 128.
* [Fix] Slab free_small_space overflow.
* [Fix] TCP port bug when UDP port of 0 is only specified.
* [Fix] Disabled UDP by default.
* [Fix] Incorrect value length checking of collection.
* [Enhance] Handled multiple scattered values of an item or an element.
* [Enhance] Used mblocks for command parsing and tokenizing.
* [Test] Reorganized the unit tests.
* [Test] Fixed the intermittent failure in the testapp test.
* [Other] A lot of code refactoring.
2018-02-27 [version 1.11.2]
* [Enhance] Improve the logic of finding list elements.
* [Fix] Add missing break when print the long query string.
* [Other] Some code refactoring.
2018-02-02 [version 1.11.1]
* [Enhance] Use element count when full range is given in bop count.
* [Enhance] Check/move cache items to LRU top only for read operation.
* [Other] Turn off printing the increament of space shortage level.
* [Other] Fix some typos, do some code refactoring.
2017-09-22 [version 1.11.0]
* [Feature] Support long key. KEY_MAX_LENGTH(250 => 32000).
* [Feature] Use space separated keys instead of comma separated keys.
* [Feature] Add a new mget command, efficient for getting multiple items.
* [Fix] Fix the trimmed/duplicated bugs of bop smget.
* [Enhance] Use memory blocks to reduce alloc/free some large memory.
2017-09-01 [version 1.10.3]
* [Feature] leave and rejoin when cache_list znode is deleted.
* [Feature] Change the name of mcfailstop to zkfailstop.
* [Fix] the miscalculated checked value in tokenize_command().
2017-07-28 [version 1.10.2]
* [Feature] Add memcached failstop on/off configuration.
- default is memcached failstop on.
* [Feature] Use zkensemble command separated from config command.
- To support various operations on ZK ensemble.
* [Enhance] Generate log messages when available space becomes scarce.
2017-06-01 [version 1.10.1]
* [Enhancement] Alleviate excessive evictions.
- Use the free small space if possible in space shortage status.
- Use 99% of used space to separate the free smalli/avail space.
* [Other] Fix typos on docs.
2017-03-24 [version 1.10.0]
* [Feature] Added a map collection type.
* [Feature] Showed the current prefix count with stats command.
* [Feature] Combined the commands for getting/setting configuration
into a single config command.
* [Feature] Set the maximum sticky memory with sticky_limit config.
* [Feature] Printed the invalid command if bad commad error occurs.
* [Feature] Stopped cache node if more than one server mapping znodes exist.
* [Fix] Fixed key dump bugs such as memory leak, duplicate dump, etc.
* [Fix] Fixed the negative free_chunk_space problem.
* [Enhancement] Reduced excessive evictions by adjusting sm classes.
* [Enhancement] Enhanced set performance by using prefix pointer
when check invalid items.
* [Internal] Managed engine source code with separate engine directories.
* [Internal] Added the demo engine for use as a reference engine.
* [Internal] Performed the preparation task for long key support.
* [Internal] Performed ZK operation outside of zk watcher with a separate thread.
* [Internal] Added/used a scan facility to scan items in hash table.
* [Internal] Modified the ketama hash ring structure more usefully.
* [Other] Extensive minor enhancements.
* [Other] Extensive code refactoring.
2016-05-22 [version 1.9.5]
* Fix config/autorun.sh for arcus build.
* Strengthen the integrity of tokenize_keys() function.
* Change the output format of lqdetect and cmdlog stats.
* Add the number of incr/decr requests on prefix stats.
* Fix failing autorun.sh on dash.
* Add do_btree/set_elem_delet_fast function as disabled state.
* Fix compile warning when use gcc of lower version (ex, 4.1).
* Add "SERVER_ERROR out of memory" response in process_bop_update_prepare_nread.
* Add cmd_incr/cmd_decr/cmd_delete stats.
* Fix the uninitialized variable in lqdetect_dupcheck.
* Fix the max integer test failure in OSX environment.
2016-01-27 [version 1.9.4]
* Do background eviction only if item_evict_to_free is true.
* Close ZK conn before close listen socket during shutdown.
* Change package name and bug-report mail address.
* Check maximum service code length of 32.
* Augment messages printed when client connections are closed.
* Add long query(or request) detection funtionality.
* Remove the pid file as the first task of shutdown.
2015-11-13 [version 1.9.3]
* Complete key dump funtionality.
- fix a mistake in parsing dump ascii command.
- update manual to have key dump usage.
* Fix a typo in comand logging usage.
* Update manual to have commnag logging usage.
2015-11-09 [version 1.9.2]
* Support cache key dump by prefix.
* Fix the bug that "SERVER_ERROR internal" is returned
when unique condition is given in smget operation.
2015-11-03 [version 1.9.1]
* Restore the old smget interface to ensure backward compatibility.
So, both(the old one and the new one added since 1.9.0) smget
intefaces are supported.
2015-10-26 [version 1.9.0]
* Hash table expansion by worker threads. Don't create a daemon thread.
* Compute element access overhead in bop delete/count/get/mget.
* Swallow the remaining data when command pipeling fails.
* Do more delicate synchronization when close ZK.
* Support command logging.
* Link the detached items into LRU top only if they are valid.
* New smget interface
- Continue smget even if some bkeys of a key are trimmed in bkey range.
- Missed keys are returned with the cause.
(NOT_FOUND, UNREADABLE, OUT_OF_RANGE).
- Trimmed keys are returned with the last bkey before trim.
- Support unique smget that remove duplicate bkeys as an option.
* Set/get maximum collection size with config command.
2015-07-31 [version 1.8.5]
* Graceful shutdown waits for all threads to be stopped.
* Graceful shutdown closes listen socket and all client connections.
* Fix the mistake in setting hb_thread_sleep value.
* Increase initial hash table size - 64K => 128K.
* Internal code optimization and code refactoring.
* Add some preparation code for replication and migration.
2015-05-29 [version 1.8.4]
* Set btree trimmed if the insertion of a bkey to trimmed space is tried.
* Support large btree(max 1000000 elements), but be careful in using that.
* Change memcached heartbeat scheme and make it configurable.
* Change reserved slab ratio - from 4 to 5 percent.
* Detach the referenced items from LRU at eviction time.
* Fix the list element insertion issue when overflow trim occurs.
* Extensive code refactoring - remove not-used old code.
* Fix some minor bugs.
2015-02-02 [version 1.8.3]
* Extensive code refactoring.
* Comment out "tap protocol" code.
* New EWOULDBLOCK and notify_io_complete handling.
* Clarify item unlink and element delete causes.
2014-12-30 [version 1.8.2]
* Reduce "too many evictions" occurrences.
2014-09-22 [version 1.8.1]
* Support Mac OSX (Mavericks)
2014-07-24 [version 1.8.0]
* Add bop pwg(position with get) command.
* Configurable max collection size, but limitative.
2014-06-12 [version 1.7.1]
* Fix the memory corruption by integer overflow of list index.
2014-05-15
* arcus-memcached is opened. (Apache License 2.0)
2014-04-30
* arcus-memcached: version 1.7.0 release