local function redis_get()
        local config = require 'core.config'
        local redis = require 'resty.redis'
        local  r = redis:new()
      
        r:add_commands('srandmembers') -- srem key member1 ...,spop key [conut], srandmember key [count]
        local csrv_rd_tmo = 1000
        r:set_timeout(csrv_rd_tmo)
        local ok, err = r:connect_cluster(config.kvhosts, config.kvhost_pwd)
        if not ok then
            ngx.log(ngx.ERR, 'redis_get:', err)
            r:close()
            return false
        end

        local csrv_db_idx = 5
        local rv, err = r:select(csrv_db_idx)
        if not rv then
            r:close()
            return false
        end
        local k = 'xxkey'
        local value, err = r:srandmember(k, 100)
	       if not value then
                  r:close()
               return false
	end
        if type(value) == 'table' and #value > 0 then
	    local ok, err = r:srem(k, unpack(value))
            if not ok then
                r:close()
                return false
            end
            return  value
        end
        return false
    end
ngx.timer.at(5, redis_get)

会发现redis.new 的占用空间在500字节左右，会每5s创建一次redis.new 对象，导致内存线性增长。