Country-specific HS code duty reclaims

List of contents of this article:

• 1,Country-specific HS code duty reclaims Are there any operating systems that are open source?
• 2, Open source What does system mean
• 3, ApacheKafka Open Source Message System_kafka Source Code Analysis
• 4, What are the open operating systems
• 5, What are the mainstream open source distributed system architectures now?

Are there any operating systems that are open source?

1. dos class: Freedoswindows-like class: ReactOS original class: House, KolibriOS, MenuetOS, HelenOS, Openvms For more information about open source, go to LUP Take a look at the A community.

2. Linux, Singularity. An open source operating system is an operating system software that discloses the source code. It follows the use, compilation and release of open source protocols, free and open source software.The most famous of the components is Linux, which is a Unix-like operating system, and Singularity also belongs to the above type.

3. There are: Android, iOS, Symbian, WindowsPhone and BlackBerryOS. Android is a Linux-based open source operating system, which is mainly used in portable devices. At present, there is no unified Chinese name, and more people in mainland China use "Android" or "Anzhi".

What does open source system mean

1. Question 1: What is a website open source system? It is open site construction source code, and open source is open source The meaning of code.

2. In fact, there are two groups of users in the open source system. One is programmers, who are most concerned about the source code and whether it can be used for secondary development; the other is ordinary end users, who only care about the software function is not strong enough.

3. Open source, known as open source code, means that users use the source code to use, compile and republish it in accordance with the open source protocol (GNU). Although you can modify it, the open source system is also copyrighted and protected by law.

4. LINUX systems like MOTO are open source systems. Open source not only means open program source code. Open source software defined from the perspective of distribution must meet the following conditions: free reissue program source code The program must contain the source code. The distribution must be allowed to contain the compiled form and the program source code at the same time.

5. Open source means that the source code is not encrypted. The advantage is that individual or third-party software enthusiasts can modify the system or software, which can differentiate and refine the software, which is conducive to the long-term development of the system or software and makes it more widely used.

6. Open source literally means open source. Users can modify and supplement on the basis of the source code to form a distinctive customization.Function, many people think that open source is free. It is only open to the outside world, but it must meet the requirements of the original development company.

ApacheKafka Open Source Message System_kafka Source Code Analysis

ApacheKafka is a set of open source message systems, which is the most It was first developed by LinkedIn and then became part of the Apache project. Kafka is a distributed, partitioned and replicable submission log service. Now, three colleagues in LinkedIn have left to start a business and continue to develop kafka.

In fact, Topic is created in KIt has been described in the topic creation process (III) of afka source code analysis. This article is different from the previous one. This article is mainly described from the perspective of Controller, and the three Topic-level operations of new creation, expansion and deletion are put together. A summary.

Jafka/Kafka Kafka is a sub-project under Apache, which is a high-performance cross-language distributed Publish/Subscribe message queue system, and Jafka is incubated on Kafka, that is, Kaf An upgraded version of ka.

As a typical message middleware product, the kafka system still consists of three parts: producer, broker and consumer.

kafka is written by Scala and Java. Kafka is a distributed subscription message system with high throughput. It can process all the action flow data of consumers on the website, which is usually aggregated by processing logs and logs due to throughput requirements. To solve it.

Kafka is a distributed message queue system developed by LinkedIn. It is mainly used to process the real-time streaming of massive data. Kafka has high performance and reliability in data transmission, and also supports data replication and failure recovery, so it is widely used in many big data processing and analysis platforms.

What are the operating systems with open source code

Linux.According to the query CADN, Linux is an open source computer operating system that can be freely disseminated. Its purpose is to establish a UNIX-like system that is not subject to any commercial software copyright and can be used freely throughout the world.

Android system. Android is a Linux-based free and open source operating system. It is mainly used in mobile devices, such as smartphones and tablets, and is led and developed by Google and the Open Mobile Alliance. There is no unified Chinese name yet, and more people in mainland China use "Android".

The source code of the Windows operating system is open. It adopts a graphical user interface (GUI), which is more humanized than the previous MS-DOS that requires input instructions.With the continuous upgrading of computer hardware and software, Windows is also constantly upgrading, from 16-bit, 32-bit to 64-bit architecture.

What are the mainstream open source distributed system architectures now

The architecture system of distributed systems: object-based systems, service-oriented architecture (SOA), REST-style architecture, Microservice architecture (MSA), container technology, Serverless architecture. Distributed message services: Apache Active, RabbitMQ, RocketMQ, Apache Kafka.

Ceph: Ceph is an open source distributed storage system that adopts a scalable object storage model.It has the characteristics of high reliability, high scalability and high performance, and excels in large-scale data storage.

At present, in addition to GPFS, several mainstream distributed file systems include PVFS, Lustre, PanFS, GoogleFS, etc.

Hadoop Hadoop is a distributed system infrastructure developed by the Apache Foundation. Users can develop distributed programs without knowing the details of the distributed underlying. Make full use of the powerful high-speed computing and storage of the cluster.

ElasticSearch is a real-time distributed search engine based on Lucene. Huilongguan Beida Qingniao believes that it is one of the widely used open source search engines due to its stable, reliable, fast speed, convenient installation and other characteristics.

There are several frameworks similar to HDFS: Ceph: It is an open source distributed storage system that can provide object storage and file system services on a group of servers.