**What**: XComs (Cross-Communication) in Airflow enable task-to-task data passing. Push via xcom_push() or return; pull via xcom_pull(). **Why**: Pass small metadata—file paths, counts, task IDs. NOT for large payloads—use S3/GCS and pass paths. **Backend**: DB default; custom...
This easy-level General/Other question appears frequently in data engineering interviews at companies like Verizon. While less common, it tests deeper understanding that distinguishes strong candidates. Mastering the underlying concepts (airflow) will help you answer variations of this question confidently.
Start by clearly defining the core concept being asked about. Interviewers want to see that you understand the fundamentals before diving into implementation details. Structure your answer with a definition, then explain the practical application with a concise example.
What: XComs (Cross-Communication) in Airflow enable task-to-task data passing. Push via xcom_push() or return; pull via xcom_pull().
Why: Pass small metadata—file paths, counts, task IDs. NOT for large payloads—use S3/GCS and pass paths.
Backend: DB default; custom (S3, Redis) for scale. TaskFlow API in Airflow 2.0+ returns values directly.
Trade-off: Large payloads in XCom strain metadata DB; keep serializable, small.
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Analyze My Answer — FreeAccording to DataEngPrep.tech, this is one of the most frequently asked General/Other interview questions, reported at 1 company. DataEngPrep.tech maintains a curated database of 1,863+ real data engineering interview questions across 7 categories, verified by industry professionals.