Defer an Azure Service Bus message and retrieve it later by sequence number instead of losing your place in the queue
domain: azure-service-bus · 6 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Receive the message in PeekLock mode, then call DeferMessageAsync() (.NET), deferMessage() (Java), or defer_message() (Python) instead of completing or abandoning it
Record the message's SequenceNumber somewhere durable — the receiver's lock is released and the message becomes invisible from normal receive calls, retrievable only by sequence number
When ready to process it, call ReceiveDeferredMessageAsync(sequenceNumber) (.NET), receiveDeferredMessage(sequenceNumber) (Java), or receive_deferred_messages(sequence_numbers) (Python) — any receiver that knows the sequence number can retrieve it, not just the original deferrer
Complete or dead-letter the retrieved message as normal once processed
Account for deferred messages still counting against the queue's size/quota limits, since they remain in the main queue rather than moving to a subqueue
If the sequence number is lost, fall back to peek/browse operations to rediscover the deferred message
Known gotchas
A deferred message's TTL is not actively enforced while it sits deferred — expiration is only checked when a client later tries to retrieve it by sequence number
Deferred messages stay in the main queue (unlike dead-lettered messages, which move to a subqueue) and continue counting toward queue size limits
Retrieval depends entirely on the caller having tracked the sequence number themselves; there's no built-in index of deferred messages
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