Recently, my team encountered a critical production issue in which Apache Airflow tasks were getting stuck in the “queued” state indefinitely. As someone who has worked extensively with Scheduler, I’ve handled my share of DAG failures, retries, and scheduler quirks, but this particular incident stood out both for its technical complexity and the organizational coordination it demanded.
The Symptom: Tasks Stuck in Queued
It began when one of our business-critical Directed Acyclic Graphs (DAGs) failed to complete. Upon investigation, we discovered several tasks were stuck in the “queued” state — not running, failing, or retrying, just permanently queued.
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