Tarantool 1.6.6 发布，嵌入式 NoSql 数据库

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　　Tarantool 是一个用 Lua 语言编写的嵌入式 NoSQL 数据库，可以直接在 Lua 程序中运行。合并了 Node.js 的强大网络编程和 Redis 数据持久。
　　Tarantool 1.6.6 发布，此版本是稳定版本，也就是可以在生产环境使用，没有崩溃，内存泄漏等问题。Tarantool 1.6.6 添加了对 Fedora 22，Ubuntu Vivid 平台支持；box.info.snapshot_pid 重命名为 box.info.snapshot_in_progress；Network I/O 转移到一个独立线程，每个实时性能提升 50%。
　　
　　
　　不兼容改进
　　--------------------
　　
　　A new schema of _index system space which accommodates
　　multi-dimensional RTREE indexes.
　　
　　box.info.snapshot_pid is renamed to box.info.snapshot_in_progress
　　
　　新特性和功能改进
　　------------------------------
　　
　　* threaded architecture for network
　　* threaded architecture for checkpointing.
　　* stored procedures in C/C++
　　* multidimensional RTREE index
　　* sophia 2.1.1, with support of compression and multipart
　　primary keys
　　https://groups.google.com/forum/#!topic/sophia-database/GfcbEC7ksRg
　　* new 'upsert' command available in the binary protocol
　　and in stored functions.
　　* better memory diagnostics information for fibers, tuple and
　　index arena Try a new command box.slab.stats(), for
　　detailed information about tuple/index slabs, fiber.info() now
　　displays information about memory used by the fiber.
　　* update and delete now work using a secondary index, if the
　　index is unique.
　　* authentication triggers
　　* manifold performance improvements of net.box built-in package
　　* performance optimizations of BITSET index
　　* panic_on_wal_error is a dynamic configuration option now
　　* iproto sync field is available in Lua as session.sync()
　　* box.once() - a new method to invoke code once in an
　　instance and replica set lifetime. Use once() to set
　　up spaces and uses, as well as do schema upgrade in
　　production.
　　* box.error.last() to return the last error in a session
　　
　　New rocks
　　---------
　　* jit.*, jit.dump, jit.util, jit.vmdef modules of LuaJIT 2.0 are now
　　available as built-ins.
　　http://luajit.org/ext_jit.html
　　
　　* 'strict' built in package, banning use of undeclared variables in
　　Lua. Strict mode is on when Tarantool is compiled with debug.
　　Turn on/off with require('strict').on()/
　　require('strict').off().
　　
　　* 'pg' and 'mysql' rocks, available at http://rocks.tarantool.org
　　- working with MySQL and PostgreSQL from Tarantool
　　
　　* 'gperftools' rock, availble at http://rocks.tarantool.org -
　　getting perfromance data using Google's gperf from Tarantool.
　　
　　* 'csv' built-in rock, to parse and load CSV (comma-separated
　　values) data
　　
　　Bugs 修复
　　---------
　　#983 tarantool 1.6.6 hang connection or segfault
　　#952 Memory failure in spite of available memory in slab.info()
　　#949 tarantool 1.6 debian package should conflict with tarantool-lts-client broken build
　　#914 app/snapshot.test.lua crashes again
　　#895 update memory corruption
　　#881 Net.box "Unexpected response 0"
　　#874 Assertion `iov->iov_len < buf->capacity[buf->pos]' failed crash
　　#853 memory leak on start if replace in xlog  regression

　　#850 incomprehensible error message when running out of cluster server>　　#841 net.box uses incorrect iterator type for select with no arguments
　　#837 Replica waits infinitely if the master has no xlogs
　　#836 Restore GE iterator for HASH
　　#833 fiber.info() doesn't work  master
　　#827 Statement-level rollback crashes server if out of memory  crash
　　#826 console escape match is slow and gy
　　#825 console uses deprecated 'dostring'

　　#824 tarantoolctl>　　#822 net.box.call should roll back local transaction on error  master
　　#821 One-based indexing for UPDATE in binary protocol
　　#815 crash when invoking _G  crash
　　#811 MsgPack fixint decoded as cdata  customer
　　#713 replica enters into an infinite reconnect loop if the master has no xlogs  customer
　　#681 Sophia: support or produce error on space::alter
　　#668 Roles: do not mix up roles and users
　　#663 Roles: incorrect handling of 'read'
　　#622 sophia: multipart primary key feature
　　#616 1-based indexing and 0-based error message
　　#609 sophia get/put may block the event loop
　　#584 box_free() called even if box wasn't initialized
　　#354 yaml incorrectly escapes special characters in a string
　　#314 box API to return last error (code, message, type, errno, etc) feature
　　#266 box.info() crash on uncofigured box  crash customer
　　
　　更多改进请看发行说明。