redis distributed lock

The traditional distributed algorithmBefore understanding the Redis distributed algorithm, it is better to understand the application scenario in the cache, after understanding the application scenario, then to understand the consistency hashing algorithm, it is much easier, and more can reflect the advantages of a consistent hashing algorithm, then we first desc

Principle: Gets the specified name key if present, if there is no key, if there is no value assigned to the key, then set the expiration time; The logic to unlock deletes the key. 1. Custom class Package com.xxx.cloud.assets.redis.lock; Import java.util.Collections; Import Java.util.UUID; Import Java.util.concurrent.TimeUnit; Import Org.springframework.data.redis.core.RedisTemplate; Import Org.springframework.data.redis.core.script.DefaultRedisScript; /** * Each time you use, to new

1. Requires 6 Redis instances2, create Redis-cluster, copy 6 copies, install generated bin3. Modify the configuration fileOpen cluster-enabled Yes to comment beforePort is 7001,7002,7003,7004,7005,7006, respectively.Bind changed to current IPProtected-mode is a new feature after Redis 3.2, yes (Redis only receives requ

650) this.width=650; "Src=" Http://upload-images.jianshu.io/upload_images/5712789-6f048f20e4792433.png?imageMogr2 /auto-orient/strip%7cimageview2/2/w/1240 "style=" height:auto;vertical-align:middle;border:0px; "alt=" 1240 "/>You are welcome to study the relevant technology togetherSource source for complete projectsSpring,springmvc,spring mvc,web Development, Java distributed architecture, SHIRO,MYBATIS,KAFKA,J2EE

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MetronicClient authentication: Jqueryvalidation Plugin.Rich Text: CkecitorFile Management: CkfinderDynamic tab: JerichotabData table: Jqgriddialog box: JQuery jboxTree structure controls: JQuery ZtreeOther components: Bootstrap 4 metronic3. SupportServer middleware: Tomcat 6, 7, Jboss 7, WebLogic 10, WebSphere 8Database support: Currently only support MySQL database, but not limited to the database, the next version of the upgrade multi-data source switching and database read and write separati

frame: jQuery1.9.CSS Framework: Bootstrap 4 MetronicClient authentication: Jqueryvalidation Plugin.Rich Text: CkecitorFile Management: CkfinderDynamic tab: JerichotabData table: Jqgriddialog box: JQuery jboxTree structure controls: JQuery ZtreeOther components: Bootstrap 4 metronic3. SupportServer middleware: Tomcat 6, 7, Jboss 7, WebLogic 10, WebSphere 8Database support: Currently only support MySQL database, but not limited to the database, the next version of the upgrade multi-data source sw

; appSettings In the case of an MVC environment, create a controller parent class that derives from the controller class, and if WebForm establishes a parent class derived from System.Web.UI.Page, the parent class joins the following attribute definitions: Private Storecontainer _store; Public Storecontainer Store { get { if (! String. IsNullOrEmpty (Session.SessionID)) { session["__tempc

* Features * Key-value Java map:string value = Map.get ("key") Python dict:dictionary["key"] value ... BitMaps Bitmap bron Filter Hyperloglog Ultra Small Memory unique value Count GEO Geographic information positioning speed fast 10w OPS is the operation per second operation. means that the persistent operation data per second for Redis is stored in memory C-language single thread persistence Memory (data)-"Asynchronous hard disk RDB AOF high Availa

faster and easier. All developers are quick to get started, all devices are adaptable, and all projects are available.DistributedDistributed services: Dubbo+zookeeper+proxy+restfulDistributed message Middleware: Kafka+flume+zookeeperDistributed cache: Redis Distributed files: FastdfsLoad balancing: Keepalived+nginx+proxy (triple load)Willing to know the framework of technology or source of friends directly

developers are quick to get started, all devices are adaptable, and all projects are available.DistributedDistributed services: Dubbo+zookeeper+proxy+restfulDistributed message Middleware: Kafka+flume+zookeeperDistributed cache: Redis Distributed files: FastdfsLoad balancing: Keepalived+nginx+proxy (triple load)Cloud ServicesSUBSYSTEM: Backend management system, RESTFU service System, Dubbo Service/control

frame: jQuery1.9.CSS Framework: Bootstrap 4 MetronicClient authentication: Jqueryvalidation Plugin.Rich Text: CkecitorFile Management: CkfinderDynamic tab: JerichotabData table: Jqgriddialog box: JQuery jboxTree structure controls: JQuery ZtreeOther components: Bootstrap 4 metronic3. SupportServer middleware: Tomcat 6, 7, Jboss 7, WebLogic 10, WebSphere 8Database support: Currently only support MySQL database, but not limited to the database, the next version of the upgrade multi-data source sw

frame: jQuery1.9.CSS Framework: Bootstrap 4 MetronicClient authentication: Jqueryvalidation Plugin.Rich Text: CkecitorFile Management: CkfinderDynamic tab: JerichotabData table: Jqgriddialog box: JQuery jboxTree structure controls: JQuery ZtreeOther components: Bootstrap 4 metronic3. SupportServer middleware: Tomcat 6, 7, Jboss 7, WebLogic 10, WebSphere 8Database support: Currently only support MySQL database, but not limited to the database, the next version of the upgrade multi-data source sw

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principle, absolutely unwavering.Adding a task class can manage the life cycle, and, more usefully, you can design the task itself as listener, as the code might be: Public Abstract class Task{ PublicSerializablegetId(); Public int getState(); PubicvoidDotask (); Public void whenadded(FinalTaskqueue TQ); Public void whenpoped(FinalTaskqueue TQ);//public void Whenfaild (final taskqueue TQ); Public void whenfinished(FinalTaskqueue TQ);}Through the task interface, we can perform more robu

DistributedDistributed services: Dubbo+zookeeper+proxy+restfulDistributed message Middleware: Kafka+flume+zookeeperDistributed cache: Redis Distributed files: FastdfsLoad balancing: Keepalived+nginx+proxy (triple load)Jeesz UIBased on BOOTSTRAP4Simple, intuitive, and powerful, the most popular HTML, CSS, and JS frameworks for developing responsive layouts, mobile device-first WEB projects.Designed for all d

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Redis-based distributed locks

Traditional software services architecture is generally single-node, as long as the single node has an outage, and often a lot of services are not downtime, especially in the era of mobile internet, the availability of many applications are required to maintain the availability of 99.99....%. This requires that our services must be distributed, preferably at the same time load balancing, failover, and dynamic expansion, which is the problem to be solv

regional model, such as: national, provincial, municipal, county and county maintenance.4. Menu Management: Configure the System menu, Operation permissions, button permission identification and so on.5. Role Management: Role Menu permission assignment, set role to divide data range permissions by agency.6. Dictionary management: Maintenance of some of the more fixed data commonly used in the system, such as: whether, gender, category, level, etc.7. Operation log: System normal operation log re