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Why do we need to install Redis? When is it used? Why Redis is needed? #6344


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alper created
Support Team Director

It says Redis is required in the documentation. Why do we need to install Redis for ABP? If we don't install it, what happens?


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    alper created
    Support Team Director

    As a summary

    • If you deploy your application as multiple instances, you need a distributed cache, like Redis.
    • If you have multiple applications (like a microservice or distributed solution) that need to share the same cache objects, you need to have a distributed cache, like Redis.
    • ABP's default cache is In-Memory Cache. It is usable only if you have a single application with a single instance running on a single server. Even in that scenario, it's good to use Redis because your cached objects are not erased when the application restarts.

    What's Redis?

    • Redis (REmote DIctionary Server). This open-source application provides in-memory caching. It is known for its high-performance capabilities.

    • It’s very fast for reading/writing data. That’s why we use Redis for distributed cache in the following projects


    Where is Redis being used in ABP projects?


    Why must we use Redis in ABP projects?

    You only need to install Redis for the n-tier architecture where Web and HTTP API layers are physically separated. If you work on an n-layered solution with no HTTP API project, then you don't need Redis.

    You can see in which cases Redis is pre-required from the documentation page: docs.abp.io/en/abp/latest/Getting-Started-Setup-Environment?UI=MVC&DB=EF&Tiered=Yes


    What exactly is being cached in Redis?

    • When you see the IDistributedCache interface, it means Redis is required by default. The following modules are already using Redis (some modules are commercial modules):

      • setting-management:SettingManagementStore for setting values.
      • permission-management: PermissionStore for granted permissions.
      • saas:TenantDeletedHandler and TenantStore class
      • cms-kit: UrlShortingPublicAppService class for Shortened URL Caches
      • language-management: DynamicResourceLocalizer class for the Language Text caches
      • file-management: FileDescriptorAppService class for the Download Token Cache.
      • text-template-management: DynamicTemplateDefinitionStore class
      • gdpr: GdprRequestAppService class for Download Token Cache.

    Finally, I want you to know that you can replace Redis with any other caching provider like Memcached.


    Resources:

Made with ❤️ on ABP v9.1.0-preview. Updated on December 05, 2024, 12:19