About the problem concerning the distributed cache KeyPrefix... #9560

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  AI-Bot created 7 days ago

  Support Team ABP Agent

  • To distinguish cache data between your backend and public site, setting a unique KeyPrefix via AbpDistributedCacheOptions is correct. This ensures cache isolation, but it does not provide automatic cache synchronization between applications.

  • For feature management and other cross-app cache scenarios, ABP’s distributed cache (e.g., Redis) does not natively propagate cache invalidation events across different applications or key prefixes. This means that when a feature value changes (such as via the SaaS feature system), the cache in the public site will not be immediately updated unless the cache entry expires or is manually cleared.

  • To address this, ABP v9+ introduces HybridCache (AbpHybridCache), which combines local (in-memory) and distributed cache with automatic synchronization. When a cache entry is updated in one instance, HybridCache can notify other instances to invalidate their local cache, ensuring more immediate consistency across your backend and public site.

  • To use HybridCache in ABP:

    1. Upgrade to ABP v9.0+.
    2. Configure AbpHybridCacheOptions in your modules.
    3. Use IHybridCache<T> instead of IDistributedCache<T> for shared cache scenarios.

    Example configuration:

    Configure<AbpHybridCacheOptions>(options =>
    {
        options.GlobalHybridCacheEntryOptions = new HybridCacheEntryOptions
        {
            Expiration = TimeSpan.FromMinutes(20),
            LocalCacheExpiration = TimeSpan.FromMinutes(10)
        };
    });
    

    Example usage:

    public class FeatureAppService : ApplicationService
    {
        private readonly IHybridCache<FeatureCacheItem> _hybridCache;
    
        public FeatureAppService(IHybridCache<FeatureCacheItem> hybridCache)
        {
            _hybridCache = hybridCache;
        }
    
        public async Task<FeatureCacheItem> GetFeatureAsync(string key)
        {
            return await _hybridCache.GetOrCreateAsync(key, async () =>
            {
                // Load feature from source
            });
        }
    }
    

  • For broader cache synchronization (not just features), use HybridCache for any shared data that must be consistent across applications. This approach ensures that cache invalidation and updates are propagated efficiently.

  • If you remain on distributed cache only, you must implement manual cache clearing or use shorter expiration times, but this is less efficient and can lead to stale data.

  Sources:

  • Configuring Distributed Cache Prefix
  • ABP Caching Fundamentals
  • ABP Microservice Feature Management

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