Lots of redis connection in time wait.

Hi,
I have a code like this:

function _M.get_redis(config, host, port)
  local red = redis:new()
  red:set_keepalive(config.redis_keepalive_in_milliseconds, config.redis_pool_size)

  logger.debug("GoJek-Auth", "Trying to conntect to Redis")
  local ok, _, err = pcall(red.connect, red, host, port)

  if not ok or err ~= nil then
    ngx.log(ngx.ERR, err)
    return nil, errors.ERR_REDIS_CONNECTION
  else
    return red, nil
  end
end

-- another file
-- codes
--
--
local red, err = utils.get_redis(config, config.customer_token_redis_host, config.customer_token_redis_port)
  if err then
    logger.error("Auth", "could not connect to redis.")
    _M.authServiceResponse(config, token)
   red:close()
  end

where pool size is 50 and timeout is 20k ms. But when I do this.. netstat -an | grep TIME_WAIT | grep 6379 | wc -l it yields 28k , and I get a lot of cannot assign address..

I have also enabled tcp_tw_reuse and tcp_tw_recycle .. Why is this happening ? Does red:close() return the connection to the pool ?

Start by reading the shown get_redis function, especially set_keepalive, connect, and close behavior in lua-resty-redis. Reproduce the TIME_WAIT and “cannot assign address” counts with the stated pool size and timeout, then compare the observed connection lifecycle with the documented pooling semantics. Done means explaining whether close returns connections to the pool and identifying the cause of the excessive TIME_WAIT sockets.