Redis 3.2.6 和 4.0-rc2 发布了，Redis 是一个高性能的key-value数据库。 redis的出现，很大程度补偿了memcached这类keyvalue存储的不足，在部分场合可以对关系数据库起到很好的补充作用。它提供了Python，Ruby，Erlang，PHP客户端，使用很方便。
v3.2.6：紧急升级程度 MODERATE：GEORADIUS，BITFIELD 和 Redis 群集小型修订。
1. A bug with BITFIELD that may cause the bitmap corruption when setting offsets
larger than the current string size.
2. A GEORADIUS bug that may happen when using very large radius lengths, in
the range of 10000km or alike, due to wrong bounding box calculation.
3. A bug with Redis Cluster which crashes when reading a nodes configuration
file with zero bytes at the end, which sometimes happens with certain ext4
configurations after a system crash.
v4.0-rc2：升级紧急程度 LOW：此版本主要修复罕见的相关模块子系统的 GEO API 错误和崩溃。
1. GEORADIUS could fail reporting items with very big radius lengths because
of a bug in the bounding box computation function. This was fixed and tests
with large radius sizes were added.
2. There was a crash in the modules subsystem that was not merged into RC1 for
an error, while it was already fixed into the “unstable” branch.