Send value together with the key on expire notification

[jozic]

As of now when redis sends an expire notification only key is included in the notification. Sometimes it's useful to do something based on value once an expire notification is received, but at this point key (and value) is deleted and there is no way to get this expired value.
for example please see this questions http://stackoverflow.com/questions/18328058/redis-2-8-notifications-get-value-instead-of-key-on-expire#

[mattsta]

It sounds like a good idea at first, but Redis values are data types. How do we return an entire sorted set with the expiration notice? What about a sorted set with a million elements? A 512 MB string? An entire hash with a thousand field/value pairs?

It's not something Redis can handle natively because sending one automatic notice could collapse the server by doubling memory usage if the server is using large values.

So... nice idea, but not really feasible directly with the notification system.