ESOCKETTIMEDOUT我正在使用 Node.js - 异步和请求模块来抓取 100+ 数百万个网站，ETIMEDOUT但几分钟后我一直遇到错误。
重新启动脚本后它再次起作用。这似乎不是连接限制问题，因为我仍然可以做 resolve4、resolveNs、resolveMx 并且也curl没有延迟。
你看到代码有什么问题吗？或任何建议？我想将 async.queue() 并发量提高到至少 1000。谢谢。
var request = require('request'),
async = require('async'),
mysql = require('mysql'),
dns = require('dns'),
url = require('url'),
cheerio = require('cheerio'),
iconv = require('iconv-lite'),
charset = require('charset'),
config = require('./spy.config'),
pool = mysql.createPool(config.db);
iconv.skipDecodeWarning = true;
var queue = async.queue(function (task, cb) {
dns.resolve4('www.' + task.domain, function (err, addresses) {
if (err) {
//
// Do something
//
setImmediate(function () {
cb()
});
} else {
request({
url: 'http://www.' + task.domain,
method: 'GET',
encoding: 'binary',
followRedirect: true,
pool: false,
pool: { maxSockets: 1000 },
timeout: 15000 // 15 sec
}, function (error, response, body) {
//console.info(task);
if (!error) {
// If ok, do something
} else {
// If not ok, do these
console.log(error);
// It keeps erroring here after few minutes, resolve4, resolveNs, resolveMx still work here.
// { [Error: ETIMEDOUT] code: 'ETIMEDOUT' }
// { [Error: ESOCKETTIMEDOUT] code: 'ESOCKETTIMEDOUT' }
var ns = [],
ip = [],
mx = [];
async.parallel([
function (callback) {
// Resolves the domain's name server records
dns.resolveNs(task.domain, function (err, addresses) {
if (!err) {
ns = addresses;
}
callback();
});
}, function (callback) {
// Resolves the domain's IPV4 addresses
dns.resolve4(task.domain, function (err, addresses) {
if (!err) {
ip = addresses;
}
callback();
});
}, function (callback) {
// Resolves the domain's MX records
dns.resolveMx(task.domain, function (err, addresses) {
if (!err) {
addresses.forEach(function (a) {
mx.push(a.exchange);
});
}
callback();
});
}
], function (err) {
if (err) return next(err);
// do something
});
}
setImmediate(function () {
cb()
});
});
}
});
}, 200);
// When the queue is emptied we want to check if we're done
queue.drain = function () {
setImmediate(function () {
checkDone()
});
};
function consoleLog(msg) {
//console.info(msg);
}
function checkDone() {
if (queue.length() == 0) {
setImmediate(function () {
crawlQueue()
});
} else {
console.log("checkDone() not zero");
}
}
function query(sql) {
pool.getConnection(function (err, connection) {
if (!err) {
//console.log(sql);
connection.query(sql, function (err, results) {
connection.release();
});
}
});
}
function crawlQueue() {
pool.getConnection(function (err, connection) {
if (!err) {
var sql = "SELECT * FROM domain last_update < (UNIX_TIMESTAMP() - 2592000) LIMIT 500";
connection.query(sql, function (err, results) {
if (!err) {
if (results.length) {
for (var i = 0, len = results.length; i < len; ++i) {
queue.push({"id": results[i]['id'], "domain": results[i]['domain'] });
}
} else {
process.exit();
}
connection.release();
} else {
connection.release();
setImmediate(function () {
crawlQueue()
});
}
});
} else {
setImmediate(function () {
crawlQueue()
});
}
});
}
setImmediate(function () {
crawlQueue()
});
而且系统限制非常高。
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
Max data size unlimited unlimited bytes
Max stack size 8388608 unlimited bytes
Max core file size 0 unlimited bytes
Max resident set unlimited unlimited bytes
Max processes 257645 257645 processes
Max open files 500000 500000 files
Max locked memory 65536 65536 bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 257645 257645 signals
Max msgqueue size 819200 819200 bytes
Max nice priority 0 0
Max realtime priority 0 0
Max realtime timeout unlimited unlimited us
系统控制
net.ipv4.ip_local_port_range = 10000 61000