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我在PCF上连接到mariadb实例上有一个nodejs应用程序。实例wait_timeout为600，因此在闲置后10分钟后将断开连接。PCJ上的Nodejs Mariadb超时未触发mariadb事件
在我的本地机器上运行此应用程序并连接到MariaDB的本地实例上泊坞窗（一旦超时命中或当我杀死连接），我会得到一个MySQL Server has gone away然后我的应用程序将重新连接，并给我的数据库的结果。它不会在本地崩溃。
当PCF运行这个MariaDB的错误会导致应用程序崩溃或者异常被捕获就会死机并发送Headers already sent error
我认为，一旦MariaDB的杀死连接不知何故在节点MariaDB的驱动程序不通知即使我在连接上有事件处理程序，连接也被终止。因此，一旦我的应用程序尝试运行查询，它会失败，因为事件没有被触发，并试图在关闭的连接上运行它。
我的连接模块
// Loading local .env vars
var route_helper = require("./route_helper");
route_helper.loadLocalEnvVars();
var Client = require('mariasql');
var moment = require('moment');
var connection = null;
try{
connection = new Client({
host: process.env.DB_MARIA_HOST,
user: process.env.DB_MARIA_USER,
password: process.env.DB_MARIA_PASS,
db: process.env.DB_MARIA_SCHEMA,
port: parseInt(process.env.DB_MARIA_PORT),
connTimeout: 20,
pingInterval: 1,
compress: true
});
connection.connect(function(err){
if(!err) {
if(process.env.DEBUG == "true"){
console.log("Database is connected");
}
} else {
console.log("Error connecting database " + err.message);
console.log(err);
}
});
connection.on('ready',function(){
if(process.env.DEBUG == "true"){
console.log("Connection ready " + moment().format('MMMM Do YYYY, h:mm:ss a'))
}
});
connection.on('close',function(){
if(process.env.DEBUG == "true"){
console.log("Connection closed " + moment().format('MMMM Do YYYY, h:mm:ss a'))
}
});
connection.on('error',function(err){
if(process.env.DEBUG == "true"){
console.log("Connection timeout... Reconnecting")
console.log(err);
}
if(err.code == 2006){
this.connect();
}
//this.connect();
});
}catch(err){
console.log("Maria_db error")
console.log(err)
throw err;
}
module.exports = connection;
加载服务器路由器
var routes = require("./routes/application.js").appRouter(server);
var server = server.listen(process.env.PORT, function() {
console.log("Listening on port %s...", server.address().port);
});
我的路线
app.get("/applications", function (req, res) {
try{
var applications;
var dbConn = require("../util/db.js");
dbConn.query('SELECT some stuff’, function (error, results) {
if(!error) {
applications = {
"apps": results
}
return res.send(applications);
} else {
return res.send({"status": "error", "message": error.code});
}
});
}catch(err) {
console.log(err)
}
});
MySQL已经走了错误
2017-12-20T09:03:55.29-0500 [APP/PROC/WEB/0] OUT { Error: MySQL server has gone away
2017-12-20T09:03:55.29-0500 [APP/PROC/WEB/0] OUT at /home/vcap/app/node_modules/mariasql/lib/Client.js:223:12
2017-12-20T09:03:55.29-0500 [APP/PROC/WEB/0] ERR at Client.<anonymous> (/home/vcap/app/util/dbHealth.js:14:9)
2017-12-20T09:03:55.29-0500 [APP/PROC/WEB/0] ERR at emitOne (events.js:101:20)
2017-12-20T09:03:55.29-0500 [APP/PROC/WEB/0] ERR at Client.emit (events.js:191:7)
2017-12-20T09:03:55.29-0500 [APP/PROC/WEB/0] ERR at Client._onerror (/home/vcap/app/node_modules/mariasql/lib/Client.js:395:10)
2017-12-20T09:03:55.29-0500 [APP/PROC/WEB/0] ERR at Client._processQueue (/home/vcap/app/node_modules/mariasql/lib/Client.js:614:18)
2017-12-20T09:03:55.29-0500 [APP/PROC/WEB/0] ERR at /home/vcap/app/node_modules/mariasql/lib/Client.js:223:12
2017-12-20T09:03:55.29-0500 [APP/PROC/WEB/0] ERR at process._tickCallback (internal/process/next_tick.js:104:9)
2017-12-20T09:03:55.31-0500 [APP/PROC/WEB/0] ERR npm ERR! Exit status 1
2017-12-20T09:03:55.31-0500 [APP/PROC/WEB/0] ERR npm ERR! Failed at the [email protected] start script 'node server.js'.
2017-12-20T09:03:55.31-0500 [APP/PROC/WEB/0] ERR npm ERR! not with npm itself.
2017-12-20T09:03:55.31-0500 [APP/PROC/WEB/0] ERR npm ERR! You can get information on how to open an issue for this project with:
2017-12-20T09:03:55.31-0500 [APP/PROC/WEB/0] ERR npm ERR! npm bugs myapplication
2017-12-20T09:03:55.31-0500 [APP/PROC/WEB/0] ERR npm ERR! Or if that isn't available, you can get their info via:
2017-12-20T09:03:55.31-0500 [APP/PROC/WEB/0] ERR npm ERR! npm owner ls myapplication
2017-12-20T09:03:55.33-0500 [APP/PROC/WEB/0] ERR npm ERR! Please include the following file with any support request:
2017-12-20T09:03:55.33-0500 [APP/PROC/WEB/0] ERR npm ERR! /home/vcap/app/.npm/_logs/2017-12-20T14_03_55_316Z-debug.log
标题已发送错误。他们似乎也没有秩序，这很奇怪。在此测试期间，我向3个不同的服务发送3个http请求并获取此错误。
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] OUT at _combinedTickCallback (internal/process/next_tick.js:131:7)
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] OUT at Client._processQueue (/home/vcap/app/node_modules/mariasql/lib/Client.js:614:18)
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] OUT at process._tickCallback (internal/process/next_tick.js:180:9) code: 2006 }
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] ERR _http_outgoing.js:494
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] ERR at validateHeader (_http_outgoing.js:494:11)
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] ERR at ServerResponse.send (/home/vcap/app/node_modules/express/lib/response.js:158:21)
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] ERR at Object.cb (/home/vcap/app/routes/application.js:474:29)
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] OUT at Client._processQueue (/home/vcap/app/node_modules/mariasql/lib/Client.js:614:18)
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] OUT at _combinedTickCallback (internal/process/next_tick.js:131:7)
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] OUT at process._tickCallback (internal/process/next_tick.js:180:9) code: 2006 }
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] ERR throw new Error('Can\'t set headers after they are sent.');
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] ERR Error: Can't set headers after they are sent.
2017-12-27T11:07:46.41-0500 [APP/PROC/WEB/0] OUT Connection timeout... Reconnecting
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] OUT at /home/vcap/app/node_modules/mariasql/lib/Client.js:223:12
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] OUT { Error: MySQL server has gone away
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] OUT { Error: MySQL server has gone away
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] OUT at _combinedTickCallback (internal/process/next_tick.js:131:7)
2017-12-27T11:07:46.41-0500 [APP/PROC/WEB/0] OUT Route: /applications
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] OUT { Error: MySQL server has gone away
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] OUT at Client._processQueue (/home/vcap/app/node_modules/mariasql/lib/Client.js:614:18)
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] OUT at /home/vcap/app/node_modules/mariasql/lib/Client.js:223:12
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] ERR at ServerResponse.setHeader (_http_outgoing.js:501:3)
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] ERR at ServerResponse.header (/home/vcap/app/node_modules/express/lib/response.js:767:10)
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] OUT at process._tickCallback (internal/process/next_tick.js:180:9) code: 2006 }
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] OUT at /home/vcap/app/node_modules/mariasql/lib/Client.js:223:12
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] ERR ^
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] ERR at ServerResponse.send (/home/vcap/app/node_modules/express/lib/response.js:170:12)
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] ERR at ServerResponse.json (/home/vcap/app/node_modules/express/lib/response.js:267:15)
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] ERR at cleanupReqs (/home/vcap/app/node_modules/mariasql/lib/Client.js:744:11)
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] ERR at Client._onclose (/home/vcap/app/node_modules/mariasql/lib/Client.js:574:5)
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] ERR at Client._onerror (/home/vcap/app/node_modules/mariasql/lib/Client.js:396:10)
2017-12-27T11:07:46.43-0500 [APP/PROC/WEB/0] ERR npm ERR! Failed at the [email protected] start script.
2017-12-27T11:07:46.42-0500 [APP/PROC/WEB/0] ERR npm ERR! code ELIFECYCLE
2017-12-27T11:07:46.43-0500 [APP/PROC/WEB/0] ERR npm ERR!
2017-12-27T11:07:46.43-0500 [APP/PROC/WEB/0] ERR npm ERR! [email protected] start: `node server.js`
2017-12-27T11:07:46.43-0500 [APP/PROC/WEB/0] ERR npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
2017-12-27T11:07:46.43-0500 [APP/PROC/WEB/0] ERR npm ERR! Exit status 1
2017-12-27T11:07:46.43-0500 [APP/PROC/WEB/0] ERR npm ERR! errno 1
2017-12-27T11:07:46.43-0500 [APP/PROC/WEB/0] ERR npm ERR! A complete log of this run can be found in:
2017-12-27T11:07:46.43-0500 [APP/PROC/WEB/0] ERR npm ERR! /home/vcap/app/.npm/_logs/2017-12-27T16_07_46_432Z-debug.log
编辑：用招摇
难道是'SELECT some stuff'需要10分钟以上吗？请隔离声明并确定这是真是假。如果速度很慢，那么让我们来关注它，而不是其他的东西（PDF，Header，ERRs等） –
select只选择1行或最大1000.查询运行很快，但我无法解决这个问题。看到我的“答案”。我只需要切换驱动程序。 – tiggles