Я использую Node.js - модуль async и request для сканирования более чем 100 миллионов веб-сайтов, и я продолжаю сталкиваться с ошибками ESOCKETTIMEDOUT и ETIMEDOUT через несколько минут.
Он снова работает после перезапуска script. Это, по-видимому, не проблема ограничения соединения, потому что я все еще могу без проблем выполнить разрешения4, resolveNs, resolveMx, а также curl.
Вы видите какие-либо проблемы с кодом? или какие-либо советы? Я хотел бы увеличить async.queue() concurrency до 1000. Спасибо.
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 name server records
dns.resolveNs(task.domain, function (err, addresses) {
if (!err) {
ns = addresses;
}
callback();
});
}, function (callback) {
// Resolves the domain IPV4 addresses
dns.resolve4(task.domain, function (err, addresses) {
if (!err) {
ip = addresses;
}
callback();
});
}, function (callback) {
// Resolves the domain 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()
});
И системные ограничения довольно высоки.
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
Sysctl
net.ipv4.ip_local_port_range = 10000 61000
