in order to use a lot less memory while the saving child process is performing
a BGREWRITEAOF or a BGSAVE, so handle with care for a couple of weeks.
+Oh, and I've some very good news: the majority of apps can work if you simply replace 2.2 in your old 2.0 environment. I can't think of any breakage.
+
WHAT'S NEW IN REDIS 2.2.x
* Specially encoded data types, small lists and sets can now use up to an order of magnitude less memory.