KeepAlive

local function send()
    for i = 1, count do
        local ssdb_db, err = ssdb:new()
        local ok, err = ssdb_db:connect(SSDB_HOST, SSDB_PORT)
        if not ok then
            return
        else
               local key,err = ssdb_db:qpop(something)
             if not key then
                   ngx.log(ngx.ERR, "ssdb qpop err:", err)
                   -- other operations
               end
               ssdb_db:set_keepalive(SSDB_KEEP_TIMEOUT, SSDB_KEEP_COUNT)
        end
end