Programmer Think

1, Foreword Redis is one of the basic components that must be used in distributed microservices. At present, it is basically used in most domestic projects, and caching is one of its main functions. Frequent use of set() method to add annotations in projects will cause code duplication and bloated. For those who do not have enough development ...

catalogue Master slave replication Background introduction Basic architecture Quick start practice Principle analysis         Full synchronization         Incremental synchronization Interview questions         If you were aske ...

Redis transaction introduction 1. General Redis uses optimistic locking for transaction control. It uses the watch command to monitor a given key. When exec (commit transaction), if the monitored key changes after calling watch, the whole transaction will fail. You can also call watch to monitor multiple keys multiple times. Note that the ...

redis master-slave replication concept Master Slave replication refers to copying data from one Redis server to other Redis servers. The former is called master / leader and the latter is called Slave / follower; Data replication is unidirectional and can only be from master node to Slave node. Master mainly writes, Slave mainly reads. ...

Redis first day class notes Course objectives Be able to master the operation of different data types in RedisRedis can be operated using Java APIBe able to understand the two persistence methods of RedisUnderstand the master-slave replication architecture of RedisBe able to understand the Sentinel architecture of RedisUnderstand Redis cluste ...

Simple redis distributed lock Locking: set key my_random_value NX PX 30000 This command is better than setnx because the expiration time can be set at the same time. If the expiration time is not set, the application hangs and cannot be unlocked, so it is locked all the time. Unlock: if redis.call("get",KEYS[1])==ARGV[1] then ret ...

1, Structure of sds Definition of sds sds.h //Defines a char pointer typedef char *sds; /* Note: sdshdr5 is never used, we just access the flags byte directly. * However is here to document the layout of type 5 SDS strings. */ struct __attribute__ ((__packed__)) sdshdr5 { unsigned char flags; /* 3 lsb of type, and 5 msb of string l ...

Decentralized open source social platform – misskey I can't bear to see the leaders deploy mammoths. In fact, I also want to have my own district centered social platform... hmmm, but mammoths eat too much memory. Is there a better source program? So I found this high color value and low occupancy program misskey on github ##Program int ...

Introduction to Codis codis cluster Codis is a distributed Redis solution. For upper tier applications, there is no obvious difference between connecting to the Codis Proxy and connecting to the native Redis Server (unsupported command list). Upper tier applications can be used like stand-alone Redis. The lower tier of Codis will handle r ...

1. Cache String type For example, hot data cache (such as reports and star cheating), object cache and full page cache can improve the access data of hot data. 2. Data sharing distributed String type, because Redis is a distributed independent service that can be shared among multiple applications For example: distributed Session <depe ...