Redis 2.8.9 发布了，改进记录：
--[ Redis 2.8.9 ] Release date: 22 Apr 2014 # UPGRADE URGENCY: LOW, only new features introduced, no bugs fixed. * [NEW] The HyperLogLog data structure. You can read more about it in this blog post. http://antirez.com/news/75 * [NEW] The Sorted Set data type has now support for lexicographic range queries, check the new commands ZRANGEBYLEX, ZLEXCOUNT and ZREMRANGEBYLEX, which are documented at http://redis.io.