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M
166
Moderate
MongoDB · Database Server & Atlas
MongoDB server reported: Producer Consumer Queue End Closed.
Quick Answer
Error code 166 on your MongoDB Database Server & Atlas means: MongoDB server reported: Producer Consumer Queue End Closed.. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
MONGO-ATLAS-DEDICATEDMONGO-ATLAS-SERVERLESSMONGO-COMM-6.0MONGO-COMM-7.0MONGO-COMM-8.0MONGO-ENT-6.0MONGO-ENT-7.0MONGO-ENT-8.0
Likely Causes
  1. MongoDB returned code 166 (ProducerConsumerQueueEndClosed) while processing this request path.
  2. The operation ran longer than configured limits and was interrupted.
  3. Concurrency, lock pressure, or timeout budgets were exceeded under current workload.
How to Fix It
1
Review logs/telemetry for code 166 (ProducerConsumerQueueEndClosed) and capture the exact command and parameters that triggered it.
2
Reduce fan-out/concurrency temporarily and stagger retried operations.
3
Tune timeout and workload partitioning so retries do not amplify contention.
4
Inspect lock waits, queue depth, and timeout settings around the failing command.
5
Add monitoring for recurring ProducerConsumerQueueEndClosed events so future incidents are detected and triaged faster.
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Related Error Codes
12456
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