发布于 2017-07-15 00:31:40 | 237 次阅读 | 评论: 0 | 来源: 网友投递
Redis Key-Value数据库
Redis是一个开源的使用ANSI C语言编写、支持网络、可基于内存亦可持久化的日志型、Key-Value数据库，并提供多种语言的API。
Redis 4.0.0 已发布，这是 Redis 4.0 系列的首个稳定版，包含以下的一些重大改进：模块化的系统、更好的复制 (PSYNC2)、对 eviction policies, threaded DEL/FLUSH 的改进、混合 RDB+AOF 格式、对 Raspberry Pi 的支持作为主要平台、新的 MEMORY 命令行、Redis Cluster 对 Nat/Docker 的支持、更快的 Redis Cluster 键创建，以及许多其他较小的功能和一些行为修复等。
与之前的 RC 相比，有一些错误修复和改进，主要是：
Different replication fixes to PSYNC2, the new 4.0 replication engine.
Modules thread safe contexts were introduced. They are an experimental API right now, but the API is considered to be stable and usable when needed.
SLOWLOG now logs the offending client name and address. Note that this is a backward compatibility breakage in case old code assumes that the slowlog entry is composed of exactly three entries.
The modules native data types RDB format changed.
The AOF check utility is now able to deal with RDB preambles.
GEORADIUS_RO and GEORADIUSBYMEMBER_RO variants, not supporting the STORE option, were added in order to allow read-only scaling of such queries.
HSET is now variadic, and HMSET is considered deprecated (but will be supported for years to come). Please use HSET in new code.
GEORADIUS huge radius (>= ~6000 km) corner cases fixed, certain elements near the edges were not returned.
DEBUG DIGEST modules API added.
HyperLogLog commands no longer crash on certain input (non HLL) strings.
Fixed SLAVEOF inside MULTI/EXEC blocks.
Many other minor bug fixes and improvements.
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