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- How to use python to crawl CSDN popular comment URLs and store them in redis
- 1. Configure webdriver to download the Google Chrome driver, and configure importtimeimportrandomfromPILimportImagefromseleniumimportwebdriverfromselenium.webdriver.common.byimportByfromselenium.webdriver.support.uiimportWebDriverWaitfromselenium.webdriver.supportimportexpected_conditio
- Redis 863 2023-05-28 15:17:23
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- What are the redis expiration strategies?
- All data structures in Redis can set expiration time, and they will be automatically deleted when the time is up. You can imagine that there is a god of death inside Redis, always watching all the keys with expiration time set, and harvesting them as soon as their lifespan is reached. You can also think about it from the perspective of Death, whether too many keys expire at the same time, so that you are too busy. At the same time, because Redis is single-threaded, the harvesting time will also occupy the processing time of the thread. If the harvesting is too busy, it will cause lags in online read and write instructions. Expired key collection redis will put each key with an expiration time set into an independent dictionary. This dictionary will be traversed regularly to delete expired keys. In addition to scheduled traversal
- Redis 1175 2023-05-28 15:17:16
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- How to implement Redis connection and authentication in php
- Redis connection and authentication //Connection parameters: ip, port, connection timeout, return true if the connection is successful, otherwise return false$ret=$redis->connect('127.0.0.1',6379,30);//Password authentication: Returns true successfully, otherwise returns false$ret=$redis->auth('123456');
- Redis 838 2023-05-28 15:07:11
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- How to implement code scanning login in redis
- Requirements introduction First, let’s introduce what scanning QR code login is. Now, most students have QQ, Taobao, Tmall and other software installed on their mobile phones. The companies that develop these apps have their corresponding websites. In order to make login more convenient and secure for users when using their website. These companies provide services that allow you to log in using your mobile phone and scanning. The effect when logging in to the web page is as follows: Many friends may find it strange that only a QR code is displayed on the web page. How does it know which mobile phone scanned the QR code and logged in? Moreover, after the login is completed, the user information can be directly displayed to the user, which is really amazing. Principle explanation web page + server The next step is the detailed implementation of this service. head
- Redis 1383 2023-05-28 14:58:16
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- How to solve the Redis coupon flash sale problem
- 1 When placing an order to implement the coupon flash sale function, two points need to be judged: 1. Whether the flash sale has started or ended 2. Whether the inventory is sufficient. Therefore, our business logic is as follows 1. Obtain coupon information through the coupon ID 2. Determine whether the flash sale has started. If no error message is returned 3. Determine whether the flash sale is over. If it has ended, return an error message 4. If it is within the flash sale time, determine whether the inventory is sufficient 5. If sufficient, deduct the inventory 6. Create order information and save it to the coupon order In the table 6.1 Save the order id 6.2 Save the user id 6.3 Save the coupon id 7. Return the order id code implementation: (Service layer implementation class) packagecom.hmdp.service.impl;import
- Redis 1217 2023-05-28 14:52:17
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- How to implement Redis Set operation in php
- Set operation //Add an element to the set, and ignore elements that already exist in the set. If the collection does not exist, it will be created first. If the key is not a collection type, it will return false. If the element already exists, it will return 0. If the insertion is successful, it will return 1. $ret=$redis->sAdd('myset','hello');//Return all members in the set. $ret=$redis->sMembers('myset');//Judge whether the specified element is a member of the specified set, return true, otherwise return false. $r
- Redis 1306 2023-05-28 14:04:18
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- How to implement task scheduling based on Redis distributed lock
- In the process of distributed large-scale data collection, the management of information sources is particularly important. In order to ensure that the same task can only be processed by one collector at the same time, the uniqueness of task scheduling must be ensured. Usually when we carry out distributed data collection, there will usually be a scheduling module, whose main responsibility is to distribute the collection tasks and ensure the uniqueness of the tasks. Because it is distributed, it involves multiple servers (multiple machines), each server involves multiple collectors (multiple processes), and each collector may involve multiple threads. Therefore, the lock in the task scheduling module Mechanism is particularly important. Generally speaking, the lock implementation method may have the following types according to the application implementation architecture: If the handler is single-process and multi-threaded, in p
- Redis 672 2023-05-28 13:37:30
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- What is the difference between redis and memcached in PHP
- 1. Supported data types: memcached only supports key-value types, redis also supports list, set, hash, that is, redis supports more abundant data types 2. Storage data security: after memcached hangs up, the data cannot be recovered, redis supports data For persistence, the data in the memory can be saved to the disk, and can be loaded again for use when restarting. The main difference: redis supports persistence. What are the PHP frameworks: 1. Laravel, Laravel is a free and open source PHP application framework. 2. Phalcon, Phalcon is the fastest PHP framework. 3.Sym
- Redis 909 2023-05-28 13:22:14
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- How to solve the problem that Redis bigkeys command will block
- 1. A senior development engineer of SF Express executed a dangerous Redis command online, causing a company to lose 4 million and millions for one command. Does this require compensation? The code is not standardized and my colleagues burst into tears. Please be careful when coding! Out of curiosity, let me test it out. What is the problem? 2. Test the performance of 10 million data 1. Write a script file to write 10 million data. for((i=1;i>/tmp/test1.txt;done; Check whether the writing is successful through /tmp/test1.txt. 2. Write 10 million data to Redis cat/tmp/test1.txt|redis-cli -a111111--pipe3, pass
- Redis 1598 2023-05-28 13:22:06
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- What is the source code related to Redis SDS?
- The source code related to sds in Redis is in src/sds.c and src/sds.h. sds.h defines all SDS APIs. Of course, it also implements some APIs, such as sds length and sds remaining available space. ..., don’t rush to read the code, let’s take a look at the data structure of sds first. After reading it, you will understand at a glance why the code is written like that. The sdshdr data structure redis provides the implementation of several sds such as sdshdr5sdshdr8sdshdr16sdshdr32sdshdr64. Except for sdshdr5, which is special, the difference between the other sdshdr is not only the type difference between the two fields. I'll take sdshdr8 and
- Redis 726 2023-05-28 13:10:52
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- How to operate redis message queue in python
- redis is a Key-Value database. Value supports string (string), list (list), set (set), zset (ordered set), hash (hash type) and other types. Redis service 1. Install yuminstallredis2, python installation support module /opt/python2.7.13/bin/pipinstallredis3, simple direct interaction with redis In[1]:importredisIn[2]:rc=redis.Redis(host='192.168.8.237 ',p
- Redis 1755 2023-05-28 12:55:31
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- How to solve the maven error when Springboot2.6 integrates redis
- Springboot2.6 integrates redismaven and reports an error org.springframework.bootspring-boot-starter-data-redis. After adding this configuration, the first line of POM.xml always reports an error: DescriptionResourcePathLocationTypeio.lettuce:lettuce-core:jar:6.1.8. RELEASEfailedtotransferfromhttps://repo.maven.apache.org/maven2duringaprevio
- Redis 1978 2023-05-28 12:55:12
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- How SpringBoot integration uses Redis
- SpringBoot integrates using redis. Jedis is a Java-oriented client officially launched by Redis. It provides many interfaces for Java language calls. It can be downloaded from the Redis official website. Spring-data-redis is part of the spring family. It provides access to the redis service through simple configuration in the srping application, and highly encapsulates the redis underlying development package (Jedis, JRedis, andRJC). RedisTemplate Provides various redis operations spring-data-redis provides the following functions for jedis: automatic management of connection pools, providing a
- Redis 694 2023-05-28 12:18:33
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- What is the database concept of Redis
- 1. The origin of 16 databases. Redis is a dictionary-structured storage server. A Redis instance provides multiple dictionaries for storing data. The client can specify which dictionary to store the data in. This is similar to how multiple databases can be created in a relational database instance (as shown in the figure below), so each dictionary can be understood as an independent database. Taking the MySQL instance as an example, Redis supports 16 databases by default. You can modify this value by adjusting the databases in the Redis configuration file redis/redis.conf. After the settings are completed, restart Redis to complete the configuration. After the client establishes a connection with Redis, database No. 0 will be selected by default.
- Redis 785 2023-05-28 12:13:06
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- What are the Redis cluster modes and what are their advantages?
- Stand-alone mode Redis in stand-alone mode is very simple. You only need to start a single node. The installation process takes no more than 5 minutes. By testing simple commands through redis-benchmark, the QPS can reach more than 100,000, which is very amazing. The problems with stand-alone mode are also very obvious. Lack of high availability mechanism! If the redis process dies, the process can only penetrate into the underlying database, which is very dangerous for the business. If you use redis as a data storage, the situation will be more serious and data may even be lost. Master-slave mode So the most basic redis deployment will add one or more slaves (now called replication). Be the master of redi
- Redis 1061 2023-05-28 11:44:10
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