Question 1

Explain the types of triggers in ADF, including schedule, tumbling window, and event-based triggers.

Accepted Answer

Schedule: Fixed cadence (cron, every N mins). Predictable batch windows; simple ops. Tumbling window: Fixed non-overlapping intervals; fires once per window. Ideal for idempotent, exactly-once semantics—no overlap means no double-processing. Event-based: Fires on blob created, queue message, etc. Enables near real-time pipelines....

Question 2

What challenges can arise when using high degrees of parallelism?

Accepted Answer

Situation: Parallelism trade-offs. Task: Explain risks and mitigations. Action: Challenges: resource contention, small files, connection limits, cost, coordination overhead. Why: more parallelism ≠ linear speedup. Mitigation: tune to cluster, coalesce/repartition wisely, connection pooling, cost monitoring. Start moderate; scale with metrics....

Question 3

Differentiate between global and local variables in ADF.

Accepted Answer

Architectural logic: Global parameters = factory-level; accessible to all pipelines. Local (pipeline) parameters = per-pipeline; passed at runtime or from triggers. Use global for env, base URL; local for LoadDate, table list. Reference: @pipeline().globalParameters.Environment, @pipeline().parameters.LoadDate. Why: Centralize cross-pipeline config; pipeline-specific for runtime....

Question 4

Explain how you debug failed pipelines in ADF.

Accepted Answer

Debug flow: (1) Monitor → Pipeline runs → filter Failed. (2) Activity details → Error tab. (3) Output → View Data for counts/samples. (4) Diagnostic settings → Log Analytics; Kusto queries. (5) SHIR: Windows Event Log, IR logs. Example: Connection timeout → verify SHIR reachability, firewall....

Question 5

Explain the use of Web Activity in ADF.

Accepted Answer

Architectural use: Web Activity = HTTP/HTTPS call to REST endpoint. Use cases: APIs, Logic Apps, webhooks. Example: Pipeline failure → Web Activity POST to Logic App → Teams. Config: Method, URL, headers, body....

Question 6

How are Logic Apps used in ADF projects?

Accepted Answer

Architectural use: Logic Apps = workflows for approvals, notifications, HTTP. Integration: ADF Web Activity triggers Logic App; Logic App can call ADF REST API. Use case: Pipeline failure → Web Activity → Logic App → Teams/Slack. Approval → Logic App → trigger ADF....

Question 7

How can you increase parallelism in ADF pipelines?

Accepted Answer

Strategies: (1) ForEach batchCount >1 (max 20). (2) Copy Data parallelCopies (up to 256 cloud). (3) Multiple pipelines concurrently. (4) Data Flow partition tuning. (5) SHIR multiple nodes. Trade-off: Source/sink limits; throttling....

Question 8

How do Logic Apps enhance notification workflows for monitoring pipelines?

Accepted Answer

Architectural flow: ADF Alert or Web Activity (on failure) → HTTP trigger Logic App → email/Teams/Slack/PagerDuty. Logic App parses run info, formats message. Why: No native ADF PagerDuty/Slack; Logic App has connectors....

Virtusa Data Engineer Interview Questions

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Virtusa Data Engineer Interview Questions

Reading isn't practice. Get AI feedback on your answers.

Other Companies