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Redis supports lua scripting. Using eval command, we can execute a lua script in redis. Is the lua script compiled or interpretted when redis calls a lua script?
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Lua is not directly interpreted through a Lua file like other languages such as Python. Instead, it uses the Lua interpreter to compile a Lua file to bytecode. The Lua interpreter is written in ANSI C, making it highly portable and capable of running on a multitude of devices.
Presently, Redis supports a single scripting engine, the Lua 5.1 interpreter.
Lua is implemented in pure ANSI C and compiles unmodified in all known platforms. All you need to build Lua is an ANSI C compiler (gcc and clang are a popular ones). Lua also compiles cleanly as C++.
Lua scripts are executed atomically, that is, no other script or command will run while a script is running, which gives us the same transactional semantics as MULTI / EXEC .
Lua scripts sent to the Lua library for execution are always compiled to Lua VM instructions before execution. These instructions are then interpreted by the Lua VM.
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