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Queue never retries with a smaller batch after HTTP 413; the whole batch is dropped after the max attempts

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Évaluation

Difficulté
3/5
Temps estimé
1-2 jours
Accessibilité débutants
72/100
Type d'issue
Bug
Clarté
Clairement spécifiée
Activité
Active
Stack technique
csharp
Domaine
backend, testing

Piste de recherche

Start with src/Exceptionless/Queue/DefaultEventQueue.cs, especially the 413 handling and the loop exit at the cited lines; trace how the reduced batch size is used on the next iteration. Check src/Exceptionless/Extensions/FileStorageExtensions.cs to understand retry counts and cleanup. Reproduce with a fake ISubmissionClient that returns 413 above a chosen batch size; done when queued events are retried in smaller batches and only individually oversized events are discarded.

Rédigé par le modèle d'indexation à partir du texte de l'issue.

Description

bug

In Exceptionless 6.2.0 (core Exceptionless package), when the server responds 413 (Request Entity Too Large), DefaultEventQueue.ProcessAsync lowers a local batchSize and logs "The event will be retried with a smaller batch size", but it then exits the loop immediately. The next run starts again at SubmissionBatchSize, so the smaller batch is never sent.

Where

What happens

  1. A batch of up to 50 events (the default SubmissionBatchSize) gets a 413.
  2. batchSize becomes 33, the batch is released, and the loop breaks.
  3. About 10 seconds later the timer runs ProcessAsync again, which starts at 50 again and resends the same oversized batch.
  4. Each attempt increments the queued files' attempt counter. Once they reach QueueMaxAttempts (default 3), CleanupQueueFiles deletes them.

The result is that every event in the batch is discarded, including events that would have been accepted in a smaller batch. A 413 also does not suspend processing, so the oversized request is resent on every timer tick until the events are deleted.

Expected

After a 413, the queue retries the same events with progressively smaller batches (down to 1). Only an event that is too large on its own is discarded.

Steps to reproduce

  1. Use a submission client (or a test ISubmissionClient) that returns 413 for any request with more than N events.
  2. Queue more than N events and call ProcessQueueAsync() repeatedly.
  3. Every request contains SubmissionBatchSize events. After 3 attempts the events are removed from the queue without being sent.

With the 6.2.0 package, a fake ISubmissionClient that returns 413 for more than 10 events, and 50 queued events, five calls to ProcessQueueAsync() send requests of [50, 50, 50] and then nothing: no smaller batch is ever tried and all 50 events are gone.

Suggested fix

Keep processing in the same run after a 413 (do not break when the batch was released only to shrink it), and/or keep the reduced batch size in a field so later runs use it. Consider not counting a 413 retry against QueueMaxAttempts.

Langage dominant
C#
Étoiles
573
Forks
143
Merge moyen
5 j 9 h
PR mergées (30 j)
1

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