Apache Kafka is a distributed streaming platform. Its features include a distributed publish-subscribe (pub-sub) messaging system that simplifies N ^ 2 relationships into N, allowing publishers and subscribers to operate at their own rates; ultra-fast zero-copy technology; and support for fault-tolerant data persistence.

In the battle ground, if you don’t sleep, you’ll burn out pretty quickly and make bad decisions. The principle for falling asleep within 120 seconds is to relax the whole body one part by another and not to think.

On the battlefield, if you don't sleep, you will quickly feel exhausted, make wrong decisions, feel burdened by your mission, and become a liability. You can fall asleep quickly by: gradually relaxing your entire body, avoiding thoughts; stretching your body; relaxing your facial muscles, slowing everything down; relaxing your upper body; relaxing your legs; thinking of nothing at all.

What characteristics do good managers possess? Morality, benevolence, righteousness, propriety: The Dao represents truth, the laws governing the development of the world and humanity; virtue is about serving the people and creating products and services that the public enjoys efficiently; benevolence is empathy; righteousness is fairness and justice, rewarding good deeds and punishing wrongdoings; propriety involves adhering to rules and behaving in accordance with the needs of the community.

Blockchain is a highly secure and tamper-resistant accounting technology maintained by multiple parties, also known as distributed ledger technology. Based on whether the system has a node admission mechanism, blockchains can be classified as: permissioned chains; consortium chains; private chains; and permissionless/public chains. Applicable scenarios include new types of databases, multiple business entities, mutual distrust, and strong business interrelations.

There are 12 habits American women think would be helpful to their promotions. For example, remember to claim your achievements often because others will not notice and reward your contributions unless you say it. Also, you need to be aware that expertise is not the only criteria.

Before Tao, Facebook used the cache-aside pattern to scale its social graph store. There were three problems: list update operation is inefficient; clients have to manage cache and hard to offer read-after-write consistency. With Tao, these problems are solved.

The efficiency of updating the edge list of the social graph in Memcached is too low, the logic for managing the cache on the client side is complex, and it is difficult to maintain consistency in database reads after writes. How to solve these three problems: accelerate read operations, efficiently handle large-scale reads; complete write operations in a timely manner; improve the availability of read operations.

All successful companies are different: each successful company gains a monopoly in a field by solving a specific problem. All failed companies are the same: they did not escape market competition. If a startup merely imitates the products and services of industry leaders without innovation and targets the same market, people will not buy into it.

If two people buy the same product for the same reason but have no way they could reference each other, they are not part of the same market.