由于我们集群规模较大，做扩缩容的时候，每次节点数量也比较多，一次缩容10个及以上的BE节点，基本都会报错，报错内容为：database is closed，只能通过频繁的页面点击重试。请社区帮忙一起看看这个问题，万分感谢！
报错内容为：
time="2024-10-24T13:56:58+08:00" level=error msg="failed to scale in BE node, failed to query fe master 'SHOW BACKENDS;', run sql failed, err = error in querying db with SQL SHOW BACKENDS;, sql: database is closed"
time="2024-10-24T13:57:53+08:00" level=error msg="run stage [ScaleInSingleBeStage] failed, err: failed to scale in BE node, run sql failed, err = error in querying db with SQL ALTER SYSTEM DROPP BACKEND '11...:9050';, sql: database is closed" host=11... jobID=ec6696830c224e72bc260646065fd42a stage=ScaleInSingleBeStage
