BigData / Apache Airflow Interview Questions
What are Airflow task states and what do they mean?
Each Task Instance in Airflow goes through a lifecycle represented by states:
| State | Meaning |
|---|---|
| none | Not yet scheduled |
| scheduled | Dependency met, waiting for executor |
| queued | Sent to executor, waiting for a worker slot |
| running | Currently executing |
| success | Completed without error |
| failed | Terminated with an error |
| skipped | Not run due to branching or trigger rule |
| up_for_retry | Failed but has retries remaining |
| up_for_reschedule | Sensor released its slot and is polling again |
| deferred | Waiting for an async trigger to fire |
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