我用的框架：SwooleDistributed 3, swoole 4.1, PHP7.1这个框架是有mysql异步连接池的，按他的源码，连接池对象在失去连接后会重连的，一般没问题。重连代码如下： public function query($sql, $client = null, MySqlCoroutine $mysqlCoroutine) { $notPush = false; $delayRecv = $mysqlCoroutine->getDelayRecv(); if ($client == null) { $client = $this->pool_chan->pop(); $client->setDefer($delayRecv); } else {//这里代表是事务 $notPush = true; //事务不允许setDefer $delayRecv = false; $client->setDefer($delayRecv); } if (!$client->connected) { $set = $this->config['mysql'][$this->active]; //（重点在这里，注释掉的是我调试的） //echo "\n\n"; //print_r($client); //$client->close(); $result = $client->connect($set); //ar_dump($result); if (!$result) { $this->pushToPool($client); $errcode = $client->errno ?? ''; $mysqlCoroutine->getResult(new SwooleException(sprintf("[%s]%s,%s", $errcode, $client->connect_error ??'' , $client->error ?? ''))); } } $res = $client->query($sql, $mysqlCoroutine->getTimeout() / 1000); if ($res === false) { $this->pushToPool($client); if ($client->errno == 110) { $mysqlCoroutine->onTimeOut(); } else { $mysqlCoroutine->getResult(new SwooleException("[sql]:$sql,[err]:$client->error")); } } $mysqlCoroutine->destroy(); if ($delayRecv)//延迟收包 { $data['delay_recv_fuc'] = function () use ($client) { $res = $client->recv(); $data['result'] = $res; $data['affected_rows'] = $client->affected_rows; $data['insert_id'] = $client->insert_id; $data['client_id'] = $client->id; $this->pushToPool($client); return $data; }; return new MysqlSyncHelp($sql, $data); } $data['result'] = $res; $data['affected_rows'] = $client->affected_rows; $data['insert_id'] = $client->insert_id; $data['client_id'] = $client->id; if (!$notPush) { $this->pushToPool($client); } return new MysqlSyncHelp($sql, $data); }运维要半夜维护mysql，是需要停机的，过一小段间后再启动。于是我们业务代码，也就是连接池里的对象，在他停机期间连接了mysql，很明显会失败.问题来了：我进程内的连接池里有10个swoole异步连接对象，这些连接对象在mysql 停机期间去连接过mysql的，在mysql启动后再次去连接时就报了如下的错：Connection refused. 111MySQL server has gone away. 2006然而，在mysql 停机期间没有去连接过mysql的对象 在 mysql启动后再次去连接是成功的。上面描述可能有点费解，我举个例子：我连接池有10个连接对象，mysql停机期间有4个尝试连接了（肯定是失败的）,mysql启动后，其它6个对象可以正常重连，这4个对象再也连不上了。发现这个问题，我都是费了很大的精力，也不知为啥 。请哪个大牛来给我解释一下？