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I have a simple Lua script:
while ( i < 500000 ) do
redis.call("zadd", 'test1', i, i)
redis.call( "expire", 'test1', 600 )
i = i + 1
end
local res = redis.call("zrange", "test1", 0, 500000 )
for k,a in pairs(res) do
redis.call("zadd", 'test2',k,a)
end
Why this script blocking the Redis server?
If I run in another console command, for example: set test 1, result:
BUSY Redis is busy running a script. You can only call SCRIPT KILL or SHUTDOWN NOSAVE.
Redis is single-threaded. Every command blocks it.
EVALis also a command, therefore it blocks redis.