Because I thought it was not a good idea to script Redis using an opinionated language as Tcl. Lua is a lot more "algol like", more understandable to the casual script writer.
EDIT: However there is an even more important thing that resembles Tcl in Redis: the commands you send to the server to alter the data set are very similar to Tcl commands.
I find it somewhat amusing (but understandable) that you thought Tcl was too complicated for "script programmers", but fine as the standard interface to get anything done with (raw) redis ;)
It's a shame, Redis could've become the storage back-end for the next AOL server! ;)
Well, I suppose it probably is used with aolserver anyway.
Did sandboxing factor into the equation? My understanding is lua scripts in redis aren't sandboxed, other than the (possibly?) restricted api. But one could limit heap with a custom allocator for example, and cpu cycles with a hook, if desired.
