Tag
at-least-once
- May 1, 2026 Durable Buffers and the Cost of At-Least-Once Export What has to be true for a queue to survive a process restart, why a write-ahead log adds a disk round trip to the export path, and what at-least-once cannot promise. observability
- Feb 6, 2026 Delivery Semantics and Where Duplicates Come From At-most-once, at-least-once, and exactly-once describe the disposition of a single message when an acknowledgement is lost, not a property of the network. backend systems
- Jan 10, 2025 Where the Checkpoint Goes: Offset Ordering and Two Failure Directions Committing a read position before or after the sink write chooses between losing data and repeating it, and the choice propagates through every downstream consumer. data engineering
- Mar 12, 2024 Visibility Timeouts and Lease Heartbeats in Job Claims Why a claimed job stays hidden from other workers only until a deadline, how heartbeats extend that deadline safely, and what happens when the worker is alive but cannot renew. backend systems
- Oct 28, 2023 Retry Classification When the Failure Arrives as a Timeout A timeout is the absence of an answer, not a statement that the request failed, and the decision to retry depends on whether the server can tell a duplicate from a first attempt. mobile computing