Integration / Apache NiFi Interview Questions

What is data provenance in Apache NiFi and how do you access it?

Data provenance in NiFi is the complete, immutable audit trail of everything that happens to every FlowFile from when it enters until it leaves or is dropped. NiFi records a provenance event automatically for every significant action — no explicit configuration is required.

Provenance event types include: RECEIVE (data enters NiFi), SEND (data sent to external destination), FETCH, CREATE, FORK (FlowFile split into multiple), JOIN (FlowFiles merged), CLONE, CONTENT_MODIFIED, ATTRIBUTES_MODIFIED, DROP, and REPLAY.

Each event records: timestamp, event type, duration, FlowFile UUID, attributes before and after, the component that processed it, SHA-256 content hashes, and transit URI (the actual endpoint URL for SEND/RECEIVE).

Access provenance via the NiFi global menu → Data Provenance. Search by FlowFile UUID, filename, content size, processor, or time range. From a FORK event you can navigate to child FlowFiles; from JOIN to parents — reconstructing complete lineage. The Replay button on RECEIVE or CONTENT_MODIFIED events re-injects that exact FlowFile state back into the flow, invaluable for debugging and reprocessing.

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Which provenance event type is recorded when SplitJSON divides one FlowFile into multiple child FlowFiles?CREATE

✗ Try again — CREATE is for FlowFiles generated without a parent; a split produces a FORK event.

FORK

✓ Well done — FORK records the lineage relationship between one parent FlowFile and its multiple child FlowFiles.

CLONE

✗ Try again — CLONE is for exact copies sent to multiple relationships; FORK is the split event.

What does the Replay feature on a provenance event allow you to do?Edit the FlowFile content inline

✗ Try again — provenance is read-only; content cannot be edited from the provenance UI.

Re-inject the FlowFile from that exact point in its history back into the active flow

✓ Well done — Replay re-submits the FlowFile state at that provenance event without re-triggering the original data source.

Delete the FlowFile from its current queue

✗ Try again — queue deletion is done via List Queue on the connection, not from the provenance view.

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What is Apache NiFi and what problem does it solve? What is a FlowFile in Apache NiFi? What are the three NiFi repositories and what does each store? What is a Processor in Apache NiFi and what are the main processor categories? What is a Connection in NiFi and how does back-pressure work? What is NiFi Expression Language and where can it be used? What is data provenance in Apache NiFi and how do you access it? What is a Process Group in NiFi and why is it used? What is NiFi Registry and how does it integrate with NiFi? How does NiFi clustering work and what is the role of ZooKeeper? What is a Controller Service in NiFi and how is it different from a Processor? What is the GenerateTableFetch and QueryDatabaseTable pattern for incremental database ingestion? What is the Record-based processing model in NiFi and why is it preferred? What is State Management in NiFi and what types of state scope exist? What is NiFi Site-to-Site (S2S) and when do you use it? What is NiFi and how does it relate to Apache NiFi? What is NiFi Parameter Context and how does it differ from Variables? How does NiFi handle security — TLS, authentication, and authorization? What is the NiFi NAR (NiFi Archive) classloading model? What are Reporting Tasks in NiFi and what are common use cases? How do you handle errors and failures in a NiFi flow? What is the SplitText processor and how do you control split behavior? What is the MergeContent processor and how is it used? What is the InvokeHTTP processor and what are key configuration considerations? What is the PublishKafka and ConsumeKafka processor pair and what are key configuration options? What is the ExecuteScript processor and what scripting languages does it support? What is the JoltTransformJSON processor and how do you use it? What is the PutDatabaseRecord processor and how does it differ from ExecuteSQL? What is the ListSFTP and FetchSFTP processor pattern and how does it work? What is the LookupRecord processor used for? What is the PartitionRecord processor and what is a common use case? What is the ConvertRecord processor and how is it used for format conversion? What are the NiFi processor scheduling strategies? What is the difference between EvaluateJsonPath and FlattenJson processors? How does NiFi integrate with Apache Hadoop and HDFS? What is the UpdateAttribute processor and how is its Advanced Mode used? How do you implement deduplication in a NiFi flow? What is the HandleHttpRequest and HandleHttpResponse processor pair used for? How does NiFi achieve guaranteed delivery and what are its durability guarantees? What is the Funnel component in NiFi and when do you use it? What is the difference between GetFile and ListFile + FetchFile processors? How does NiFi support schema evolution in data pipelines? What is the RouteText processor and how does it differ from RouteOnContent? What performance tuning options are available in NiFi and what are common bottleneck patterns? How does NiFi integrate with cloud storage services like Amazon S3?

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Integration / Apache NiFi Interview Questions

What is data provenance in Apache NiFi and how do you access it?

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