node-mysql池遇到ETIMEDOUT [英] node-mysql pool experiences ETIMEDOUT

问题描述

我有一个节点-mysql池配置

I have a node-mysql pool configuration of

var db_init={
            host     : 'ip_address_of_GCS_SQL',
            user     : 'user_name_of_GCS_SQL',
            password : 'password here',
            database : 'db here',
            supportBigNumbers: true,
            connectionLimit:100
};

使用以下方法创建池

GLOBAL.db_foobar = mysql.createPool(db_init);

我基本上只是将连接保持了几个小时，并且看到了我的connection.query请求(当然是在getConnection之后)报告的错误:

I basically just left the connection on for a couple of hours and I saw this error reported by my connection.query Request (after getConnection of course):

prodAPI-104 (out): { status: 'Error',
prodAPI-104 (out):   details: '[foobar_function]Error in query',
prodAPI-104 (out):   err: '{ [Error: read ETIMEDOUT]\n  code: \'ETIMEDOUT\',\n      errno: \'ETIMEDOUT\',\n  syscall: \'read\',\n  fatal: true }',
prodAPI-104 (out):   query: 'SELECT * FROM `foobar_table`;' }

为什么会这样? Google-Cloud-SQL中的MySQL并没有报告创建查询所花费的时间太长，所以我不知道为什么会这样.

Why is this happening? The MySQL in Google-Cloud-SQL didn't report a query taking too long to create so I dunno why this happened.

推荐答案

我怀疑原因是在与MySQL服务器的连接上未启用keepalive.

I suspect the reason is that keepalive is not enabled on the connection to the MySQL server.

node-mysql没有启用keepalive的选项，node-mysql2也没有，但是node-mysql2提供了一种提供自定义函数的方法来创建套接字，我们可以使用它来启用keepalive:

node-mysql does not have an option to enable keepalive and neither does node-mysql2, but node-mysql2 provides a way to supply a custom function for creating sockets which we can use to enable keepalive:

var mysql = require('mysql2');
var net = require('net');

var pool  = mysql.createPool({
  connectionLimit : 100,
  host            : '123.123.123.123',
  user            : 'foo',
  password        : 'bar',
  database        : 'baz',
  stream          : function(opts) {
    var socket = net.connect(opts.config.port, opts.config.host);
    socket.setKeepAlive(true);
    return socket;
  }
});

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