Programmer Think

background Before deploying applications, various environment configurations were needed, and various shell operations were needed to build a set of available services. Now with Docker, deployment is easier, configuration errors are less likely, and environment inconsistencies are less likely. It solves the problems of running in the local en ...

Redis source code reading: dictionary dict implementation Main Data Structures of Dictionaries Creating dictionaries and hashing algorithms Create dictionary Hash algorithm rehash process Traversal of Dictionaries Other API functions Redis source code reading: dictionary dict implementation Code version: Branch 5.0 ...

All along, we put data dictionary and other information in Redis cache, avoid using it, penetrate the database level, while improving performance. Recently, it was discovered that there were frequent Redis connection timeouts and other anomalies on the line. After tracking, it was found that a new dictionary table with more than 30,000 rows of ...

In the last section, the implementation of CoAp client and server, the data is also sent to kafka in the format defined by the installation, followed by the implementation of Mapping server, which maps physical device data to abstract devices and gives data business meaning. iot-mapping Building iot-mapping module, introducing kafka public modu ...

Snap-up and second-kill are common scenarios. Interviewers often ask questions during interviews, such as how to achieve the snap-up second-kill in Taobao. Buying and killing in seconds is very simple, but there are some problems to be solved, mainly for two problems:1. Pressure on databases caused by high concurrency2. How to ...

This article is mainly due to the plan to use django to write a planned task, which can rotate the name of the staff on duty or execute scripts on time and other functions. After Baidu has countless pits, it can finally make use of this set of things to deploy. My English is not good, English is good or people who want to learn ...

elastic: https://www.elastic.co/ In order to facilitate centralized viewing of the business logs of multiple hosts, we use Filebeat, Redis, Logstash to collect: (1) Filebeat monitors the changes of log files and writes the new part into redis. The log of each line is the data of a list set of specified key s in redis. (2) LogStash monitors t ...

redis is an advanced key:value storage system where value supports five data types: 1. strings 2. lists of strings 3. String sets 4. Ordered string sets 5. hashes There are a few points to remind you about key: 1. Keys should not be too long, try not to exceed 1024 bytes, which not only consumes memory, but also redu ...

Redis Learning Cluster Preface In the first place, we learned the basic operation of Redis, the use of Jedis and the persistence scheme of Redis. Next, we learned the cluster management of Redis. copy When data is stored on a server, if the server hangs up, the data will be lost, so Redis provides the function of replicati ...

cause We always use redis of Aliyun. We are not a high concurrent application. We mainly use redis as distributed locks and a small amount of caches. It hardly needs maintenance. Yesterday afternoon, we suddenly received an alarm email. On-line redis memory is used 100% and instantaneous nerve tension sensation is confirmed by console.This is a ...