Redis 后台内存分配问题影响 Lua 脚本运行

我最近在一个 Django 应用中添加了一些 Lua 脚本（用于与 Redis 后端进行交互）。在生产环境中（但不是在开发环境中），设置最终会给我以下错误：

Error running script (call to f_8c07b227bc796743f66bad8dbe75a5bf8fcc8cd6): @user_script:2: @user_script: 2: -MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist on disk. Commands that may modify the data set are disabled. Please check Redis logs for details about the error.

发生这种情况时，如果我查看 Redis 日志，就会看到 can't save in background: fork: Cannot allocate memory。

我知道发生了什么。我的问题是，为什么在无法为后台保存分配内存时，Redis 仍然正常运行，但 Lua 脚本会崩溃？有方法可以避免这种情况吗？

FYI，以下是我的 lua_scripts.py 模块的布局：

import redis
from location import REDLOC2 #location of relevant unix socket

my_server = redis.StrictRedis(unix_socket_path=REDLOC2)

# Get recent
lualatestlogins = """
local l = redis.call('ZRANGEBYSCORE', KEYS[1], ARGV[1]-600, '+inf') -- returns key:value pairs
local c = {}
for _, v in pairs(l) do
  local p = v:find(':')
  local i = v:sub(1,p-1)
  c[#c+1] = i
end
return c"""
getlatestlogins = my_server.register_script(lualatestlogins)

# Evict old
luacleanselogins = """
redis.call('ZREMRANGEBYSCORE', KEYS[1], '-inf', '(' .. ARGV[1]-600)"""
cleanselogins = my_server.register_script(luacleanselogins)

# -- Store new
luastorelogin = """
redis.call('ZADD', KEYS[1], ARGV[1], ARGV[2] .. ':' .. ARGV[3])
redis.call('SET',KEYS[2],ARGV[3])
redis.call('EXPIRE',KEYS[2],600)"""
storelogin = my_server.register_script(luastorelogin)

# Retrieve collisions
luaretrieveclones = """
local q = redis.call('GET',KEYS[2])
if q == nil or q == '' then
  return nil
else
  local l = redis.call('ZRANGEBYSCORE', KEYS[1], ARGV[1]-600, '+inf')
  local c = {}
  for _, v in pairs(l) do
    local p = v:find(':')
    local i = v:sub(1,p-1)
    local n = v:sub(p+1)
    if n == q then
      c[#c+1] = i
    end
  end

  return c
end"""
retrieveclones = my_server.register_script(luaretrieveclones)