Redis skip initial on Start-up #6377

5 Answer(s)

• 

  0

  liangshiwei created 4 months ago

  Support Team Fullstack Developer

  Hi,

  I think you shouldn't stop the application from crashing if Redis server is not available

  In distributed and microservice applications, distributed caching is necessary. It's like SQLServer. Imagine if the SQLServer is unavailable, will you choose to keep the application running?

  You can check this: https://support.abp.io/QA/Questions/6344/Why-do-we-need-to-install-Redis-When-is-it-used-Why-Redis-is-needed

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• 

  0

  NH-Support created 4 months ago

  Hi,

  I think you shouldn't stop the application from crashing if Redis server is not available

  In distributed and microservice applications, distributed caching is necessary. It's like SQLServer. Imagine if the SQLServer is unavailable, will you choose to keep the application running?

  You can check this: https://support.abp.io/QA/Questions/6344/Why-do-we-need-to-install-Redis-When-is-it-used-Why-Redis-is-needed

  Hi liangshiwei

  I already have a Redis cluster, But my point is that Redis is add-on for the application for optimization and therefore the application should consider it as optional,

  let's say that for whatever reason the Redis server is not available or can't accept connection in that case can i skip it and get the data i want from my SQL DB server

  because right now my application just crashes if redis is not there

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• 

  0

  liangshiwei created 4 months ago

  Support Team Fullstack Developer

  Hi,

  Ok, Although I don't recommend you to do this, it should be possible.

  For example(this just is an idea):

  [Dependency(ReplaceServices = true)]
  [ExposeServices(typeof(IDistributedCache))]
  public class MyRedisCache : IDistributedCache, ICacheSupportsMultipleItems
  {
      private readonly AbpRedisCache _cache;
  
      public MyRedisCache(AbpRedisCache cache)
      {
          _cache = cache;
      }
  
      public byte[]? Get(string key)
      {
          if (IsRedisAvailable())
          {
              return _cache.Get(key);
          }
  
          return null;
      }
      
      protected virtual bool IsRedisAvailable()
      {
          // check redis connection
          return true;
      }
      
      .....
  }
  
  
  public override void ConfigureServices(ServiceConfigurationContext context)
  {
      .....
      context.Services.AddSingleton<AbpRedisCache>();
  }
  

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• 

  0

  NH-Support created 4 months ago

  Hi,

  Ok, Although I don't recommend you to do this, it should be possible.

  For example(this just is an idea):

  [Dependency(ReplaceServices = true)] 
  [ExposeServices(typeof(IDistributedCache))] 
  public class MyRedisCache : IDistributedCache, ICacheSupportsMultipleItems 
  { 
      private readonly AbpRedisCache _cache; 
   
      public MyRedisCache(AbpRedisCache cache) 
      { 
          _cache = cache; 
      } 
   
      public byte[]? Get(string key) 
      { 
          if (IsRedisAvailable()) 
          { 
              return _cache.Get(key); 
          } 
   
          return null; 
      } 
       
      protected virtual bool IsRedisAvailable() 
      { 
          // check redis connection 
          return true; 
      } 
       
      ..... 
  } 
   
   
  public override void ConfigureServices(ServiceConfigurationContext context) 
  { 
      ..... 
      context.Services.AddSingleton<AbpRedisCache>(); 
  } 
  

  hi

  thanks for quick response

  I believe this check is performed after the initial start-up, in my case the app is not starting at all

  on start application if Redis connection string is not available / URL not correct, how can i skip it and continue the start-up

  because right now the application crashes if the Redis URL not available ? and the Try/Catch Solution didn't worked also

  

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• 

  0

  liangshiwei created 4 months ago

  Support Team Fullstack Developer

  You can try:

  ConnectionMultiplexer.Connect(configuration["Redis:Configuration"], configure =>
  {
      configure.AbortOnConnectFail = false;
  });
  

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