Question on Email Sending while Running in a scaled out Azure Appservice #10395

2 Answer(s)

• 

  0

  AI-Bot created 7 months ago

  Support Team ABP Agent

  • What you are seeing is expected with ABP’s default background job executor in a scaled-out (multiple instance) environment: each instance runs its own background job worker, so if the storage/provider doesn’t guarantee distributed “pick and lock”, you can end up with duplicate executions.

  • Best practice options (recommended order):

    1. Use a real distributed background job provider (Hangfire)

       • Configure ABP Background Jobs to use Hangfire, so job acquisition/execution is coordinated across instances (Hangfire uses distributed locks in its storage).
       • This is the recommended approach when you want multiple servers/instances processing jobs reliably and you want retries, dashboards, etc.
       • ABP already has integration so your app code that enqueues jobs doesn’t need to change.

    2. Run background job execution in a separate “job executor” application (single instance)

       • Keep your web app scaled out, but disable job execution in the web app(s), and run a dedicated console/worker app that executes jobs (can be scaled independently later with a proper provider).
       • In ABP, you can disable job execution in the web application via:

  Configure<AbpBackgroundJobOptions>(options =>
         {
             options.IsJobExecutionEnabled = false;
         });
  

   - Then create a separate console app that references your job types and runs the background job module/provider.
  

  3. Add idempotency at the business level (still recommended even with 1/2)
     • For “send email” jobs, store a unique business key (e.g., EmailNotificationId / CorrelationId) and enforce “send only once” in your own tables (unique index + “already sent” check).
     • This protects you not only from scale-out races, but also from retries, transient failures, and user double-clicks.

  • Practical guidance for your exact scenario (Azure App Service, 2 instances):
    • If you want to keep background jobs inside the same web host(s), switch to Hangfire integration (Option 1).
    • If you want the simplest “guarantee single execution” without bringing a distributed job system immediately, implement Option 2 (single executor) and later you can still move that executor to Hangfire if you need throughput.

  Links (validated):

  • https://abp.io/docs/latest/deployment/optimizing-production
  • https://abp.io/docs/latest/framework/infrastructure/background-jobs
  • https://abp.io/docs/latest/framework/infrastructure/background-jobs/hangfire
  • https://abp.io/community/articles/my9cgo9a
  • https://github.com/abpframework/abp-samples/tree/master/SeparateBackgroundJob

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• 

  0

  maliming created 7 months ago

  Support Team Fullstack Developer

  hi

  You can set only one app to execute the job, or set an application name for isolation(>= 9.2)

  See: https://abp.io/docs/latest/framework/infrastructure/background-jobs#disable-job-execution https://abp.io/docs/latest/framework/infrastructure/background-jobs#using-the-same-storage-for-background-jobs--workers

  Thanks.

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