#zeromq

[wingedmiraclesublime]

蜘蛛池需要哪些队列技术？

在互联网的广阔世界中，蜘蛛池（Spider Pool）是一个非常重要的概念。它指的是用于管理爬虫任务的系统，通过将多个爬虫任务分配到不同的服务器上执行，从而提高爬取效率和稳定性。在这个过程中，队列技术起到了关键的作用。那么，蜘蛛池需要哪些队列技术呢？本文将深入探讨这个问题。

1. 基础队列技术

消息队列

消息队列是蜘蛛池中最基础也是最常用的队列技术之一。它能够确保数据的可靠传输，并且支持高并发处理。常见的消息队列有RabbitMQ、Kafka等。这些工具可以帮助我们实现异步通信，使得爬虫任务可以被高效地调度和执行。

优先级队列

在某些情况下，我们需要对不同类型的爬虫任务进行优先级排序。例如，在抓取新闻网站时，最新的新闻应该优先被抓取。这时候就需要使用优先级队列来实现这一功能。优先级队列可以根据任务的重要程度自动调整其在队列中的位置。

2. 高级队列技术

分布式队列

随着业务规模的不断扩大，单个服务器已经无法满足需求了。分布式队列应运而生。它允许多个节点共同维护一个队列，从而提高了系统的扩展性和容错性。Redis Cluster就是一个很好的例子。

循环队列

循环队列是一种特殊的队列结构，当队列满时，新元素会覆盖旧元素。这种特性非常适合于处理那些不需要长期保存的数据流场景。比如实时监控系统就可以采用这种方式来存储最近一段时间内的数据。

3. 结合实际应用场景��择合适的技术栈

每种队列技术都有其优缺点，在实际应用中我们需要根据具体的需求来选择最合适的技术栈。例如：

- 如果你希望构建一个高可用、可扩展的蜘蛛池系统，那么建议使用分布式队列；

- 如果你的主要目标是提高响应速度，则可以选择基于内存的消息队列如ZeroMQ；

- 对于一些特殊的应用场景，如需要支持大量并发连接或具有复杂逻辑控制要求的任务调度系统，则可能需要结合多种队列技术来实现。

结语

总之，蜘蛛池中的队列技术是保证系统高效运行的关键因素之一。通过合理选择和配置合适的队列技术，我们可以有效地提升蜘蛛池的整体性能。当然，在实际操作过程中还需要不断优化调整以适应不断变化的需求。希望本文能对你有所帮助！

加飞机@yuantou2048

ETPU Machine

王腾SEO

[hackernewsrobot]

ZeroMQ: High-Performance Concurrency Framework

https://zeromq.org/

[geekgao]

为什么基于消息队列的架构现在似乎不太流行？

Hacker News帖子讨论了为什么与2000年代末和2010年代初相比，基于消息传递的架构（如Amazon SQS，RabbitMQ，ZeroMQ）现在似乎不那么受欢迎。 帖子中提到了生产中使用消息队列的经验和痛点。

总结

Redis使用：Redis现在可以处理许多传统上由消息队列管理的用例，包括缓存。

数据库改进：数据库有了显著的改进，更有效地管理大规模操作，减少了对消息队列的需求。例如，有人提到 PostgreSQL 在这种情况下表现出了强大的能力。

成熟的技术：消息队列已经成熟并变得稳定，从而减少了炒作和讨论。随着前端技术的发展，将更多的应用状态和逻辑移动到前端 SPA（单页应用）上，使得后端不再需要管理大量的“会话”状态，而只需验证最终的 API 请求数据，这也减少了对消息队列的需求。

期望与现实：有些人发现消息队列在生产环境中没有达到他们的期望。微服务架构的热度降低也影响了消息队列的使用，因为在微服务架构中，队列通常用于异步通信。而现在，对于某些应用场景，单体架构可能更为合适，从而减少了对消息队列的依赖。

Ref: https://news.ycombinator.com/item?id=40723302

[mindfiresolutions-blog]

DELIVERY SERVICE PLATFORM - A SYMFONY BASED CASE STUDY

Executive Summary

Not everybody finds shopping interesting. Besides, in a way too busy world, where there is a great paucity of time, shopping is often known to be quite a torture. A fraction of the public loves to pick up their goods/services on their own. Some people have to go shopping because they have to. There are some others who procrastinate till they have no other choice. Keeping in mind the busy (and sometimes lazy economy), a number of start-ups have ventured into the business of home delivery of goods. All it needs is to click on an app that guides the buyer through various options of having their purchase bought from one or many shops and delivered at their home.

Mindfire got an opportunity to work on such a project when its Australian client, who is an Entrepreneur, requested us to work on an app that helps mitigate the woes of reluctant shoppers by delivering their goods right at their doorsteps. Our client wanted us to develop an Uber kind of service, for requesting the delivery of items from nearby stores. The user can request for items from multiple stores at a time to be delivered to his doorstep.

Mindfire Solutions developed a delivery platform that connects the Clients and the Service Providers who are two main users of the system. Thus there are two main sections of the app, the Client Section and the Service Provider Section. The delivery system was built on the Symfony2 framework implemented REST APIs for the communication between the app and the server. Websockets were used for the real time updates. PromisePay payment gateway is used for payment processing and storing the card/accounts details securely.

About our Client

Client Description: Entrepreneur

Client Location: Australia

Industry: Online Services, Delivery Platform

Technologies

PHP, Symfony2, MySQL, Google Maps APIs, Ratchet (Websockets for PHP), ZeroMQ, Sentry (Exception reporting), Plivo (SMS), PromisePay (Payment gateway)

Download Full Case Study

[kennak]

2014 年に遡ると、私はイベント処理エンジンのコアを再構築していました。 当時の決定は、Apache Kafka を使用するか、独自のカフカを導入するかでした。 Zookeeper を調査した後、オンプレミスの顧客はおそらく Zookeeper を所有して管理することを望まなかったため、独自のサービスを導入することを決定し、メッセージング レイヤーとして ZeroMQ を選択しました。 ZeroMQ は完全に堅牢で安定していました。 信じられないほどトラブルが少なく、私たちが遭遇した唯一の問題は、構成手順に記載したポートを IT チームが開かなかったときでした。 (結果として得られるアーキテクチャは実際には Flink によく似ています) いずれにせよ、ZeroMQ は素晴らしいテクノロジーですが、あまり世の中に出回っていないような気がします。 私の経験から言うと、非常にシンプルで信じられないほど安定しています。

ZeroMQ – LGPL3 からの再ライセンスと MPL 2.0 の例外 | ハッカーニュース

[the-techlead-posts]

Create Zero-Point Failure Distributed Tasks With Python and ZeroMQ

A guide on how to build a distributed pub-sub architecture without a broker

[56perc]

DEALER, ROUTER로 REQ, REP 구현하기

DEALER, ROUTER로 REQ, REP 구현하기

이전 글에서 REQ, REP가 메시지를 주고 받을 때 그 속에서 벌어지는 일들에 대해서 살펴본 바 있다. 그리고 이를 통해 REQ > ROUTER > DEALER > REP 로 이어지는 확장 패턴이 어떻게 맞물려 돌아가는지 확인했다. 그렇다면 과연 ROUTER, DEALER 소켓은 중계기로서의 의미만 있는 것일까? 그렇지 않다. ROUTER/DEALER 소켓은 그 자체로도 유용하게 사용될 수 있는데, 이들 소켓은 REQ/REP 소켓처럼 수신-발신 사이크의 제약을 받지 않는다. 따라서 이들 소켓을 사용하면 완전히 자유로운 비동기 패턴을 구축할 수 있다. 그러한 확장 패턴을 탐구해보는 기초로서, 이 글에서는 기본적인 클라이언트-워커 패턴을 REQ-REP 가 아닌 다른 소켓을 사용하여 구현하는 방법에 대해서…

[digitalvarys]

Kafka vs ActiveMQ vs RabbitMQ vs ZeroMQ

Kafka vs ActiveMQ vs RabbitMQ vs ZeroMQ

Introduction Communication between Microservices is very important. We cannot afford to lose even a single message in the communications. Hence, we had two different Communication methods for microservices. We call those are Asynchronous and Synchronous Communications. Synchronous communication will wait for the response but on the other hand, Asynchronous communication will not wait for the…

[radiumsoftware]

I'm trying Rust ZeroMQ bindings for interprocess communication. Now it receives MIDI note events from DAW via a VST plugin (also written in Rust). https://github.com/keijiro/rust-zmq-test

[irarelypostanything]

Metaphor Potential

There’s a term I made up called Metaphor Potential, or MP, which I defined as a metric one can use to make anything interesting.  In time, most of the things we do today will seem strange - cell phones could have holographic displays, laptops will be faster if they exist at all, and the things we deem as perfectly secure will probably be flimsy and obsolete.  Maybe AES encryption will be broken.  Maybe a hacker will be able to steal your identity by looking at you funny.  In all seriousness, this field is changing a lot.  The techniques demonstrated in movies like “War Games” seem pretty outdated today, when we can be hacked via a browser, hacked by a neighbor via a replay attack, hacked by security researchers who have nothing better to do than troll the vast cyberspace for hobbyists dumb enough to host websites on dedicated hardware and default credentials.  

What makes cybersecurity interesting, I think, is the Metaphor Potential.  I just hope it doesn’t begin and end there.  A coworker (who, for reasons I cannot fathom, asked to be referred to in these blog posts as “Smack”) said that cryptography is pretty “palatable,” until you get into the crazy math - which, admittedly, is most of it.  Certification curriculums seem a mile wide and an inch deep, which makes it difficult to describe cybersecurity in any meaningful way.  We haven’t used these services extensively, but we CAN tell you which ports they use and whether they’re UDP, TCP, or both.  We haven’t written or run penetration tests with these hacker tools, ourselves, but we can repeat some definitions we’ve memorized.

Terms like TCP and UDP and HTTP are just gypsy magic wizardry, really.  ZeroMQ is the real future, but after that maybe none of these terms will mean anything.  The OSI model will be 14 layers, for some reason.  Silicon Valley will no longer run in silicon, it will run on the far more efficient element called Unobtanium.  And Kali Linux will look like a toy water pistol compared to what the hackers of the future use.  They will be able to crash self-driving cars from 1000 miles away and use them to murder unsuspecting, high-ranking members of government.

Oh no, have I said too much?

I guess what I’m trying to say is it’s interesting to think about how we can still idolize the first people who built Unix, or those who laid down the foundation for the modern computer, when we carry such superior technology today.  We like it because it inspires us on our current pursuits.  It’s why we tend to gravitate toward people who demonstrated humility, and integrity, and unquestionable morality while we simply laugh at those who were overconfident, or unscrupulous, or who stole credit from others.

Kidding.  We seem to gravitate towards the moral and the immoral in equal measures, and I haven’t figured out why.

In terms of metaphor, cybersecurity is interesting because it’s such an adversarial sort of practice.  People invent things, and they discard them, and they patch them and recreate them in response to the endless arms race.  In time the technologies will be interchangeable, but the need for a blue team and red team will probably last forever.

Every one of these topics is fascinating, a world and a history.  Or at least, it probably is.  I don’t know.

Kind of hard to keep track, when you’re trying to memorize like 1500 terms and then hopefully pass a test and forget most of them.

[datacode23]

[OUT_NOW] ∇²H=λ⁻²H

@detroitunderground-blog

info: Ascii85/Z85(ZeroMQ)

#datacode #postdigital #glitch #music #cyberpunk

[hackernewsrobot]

ZeroMQ – Relicense from LGPL3 and exceptions to MPL 2.0

https://github.com/zeromq/libzmq/pull/4555

[detund]

DU™️ @datacode23 ⛓ ◌◡⋋ℕ◯🇼︎⛓ Artist: データコード 「ｄａｔａｃｏｄｅ」 Album title: ∇²H=λ⁻²H https://detund.bandcamp.com/album/h-h nabla ^{2}\mathbf {H} =\lambda ^{-2}\mathbf {H} Ascii85/Z85(ZeroMQ) #ambient #drone #glitch #cyberpunk #darkambient #ascii #datacode #detund #detroitunderground #sounddesign https://www.instagram.com/p/CEay_tVlJsJ/?igshid=1w87rm944gnts

[bjonasn]

German Perl Workshop 2013

German Perl Workshop 2013

This is one of those blogposts, that should have been written on the plane home or on the hotel during the conference, but with too much going on and a load of work upon returning to work, it got delayed. This is an all too common pattern for me.

Anyway to get on subject, I have just attended my first German Perl Workshopever. I decided to go when I saw it was in Berlin. Berlin is fairly close to…

[bananachicks]

Gnu octave audioread process microphone input

EXEC_PATH Query or set the internal variable that specifies a colon sepa rated list of directories to append to the shell PATH when executing external programs. error_ids 'Octave:invalid-context' Indicates the error was gene rated by an operation that cannot be executed in the scope from which it was called. doc_cache_create Gene rate documentation cache for all functions in DIRECTORY. diffpara Return the estimator D for the differencing parameter of an integ rated time series. debug_on_interrupt Query or set the internal variable that controls whether Octave will try to enter debugging mode when it receives an interrupt signal (typically gene rated with 'C-c'). csvwrite Write the numeric matrix X to the file FILENAME in comma-sepa rated-value (CSV) format. csvread Read the comma-sepa rated-value (CSV) file FILENAME into the matrix X. completion_matches Gene rate possible completions given HINT. audiowrite Write audio data from the matrix Y to FILENAME at sampling rate FS with the file format determined by the file extension. Octave (32) arduino (1) communications (6) control (2) database (1) dataframe (1) dicom (1) divand (1) fem-fenics (1) financial (16) fuzzy-logic-toolkit (8) generate_html (3) geometry (1) gsl (5) image (1) instrument-control (1) interval (7) io (1) ltfat (8) mapping (1) matgeom (9) miscellaneous (1) msh (1) nan (4) nurbs (1) parallel (1) signal (15) statistics (7) stk (10) symbolic (2) tisean (5) tsa (3) zeromq (1) octave audioread Read the audio file FILENAME and return the audio data Y and sampling rate FS.