Apache NiFi

Dataflow engine with guaranteed delivery, back pressure and data provenance.

Provider: default
Kind: Stream processor
Category: Messaging
Official docs: https://nifi.apache.org/nifi-docs/overview.html

Properties · 4 set by this component

property	type	values	required	kind default	this component
backPressure · component property	boolean	—	no	true	inherited
checkpointIntervalSeconds	integer	—	no	—	inherited
clustered · component property	boolean	—	no	false	inherited
exactlyOnce	boolean	—	no	false	▸ false
instances	integer	—	no	—	inherited
lateDataPolicy	enum	drop \| shift \| sideline	no	—	inherited
managed	boolean	—	no	false	▸ false
provenanceRepository · component property	boolean	—	no	true	inherited
stateBackend	enum	memory \| rocksdb \| external	no	memory	▸ external
watermarkSeconds	integer	—	no	—	inherited
windowing	enum	none \| event-time \| processing-time	no	none	▸ none

Rules that apply · 1

Every rule whose selector covers this component's kind or its category. Whether a rule fires depends on the design: its properties, its edges and its groups.

Event-time windows without watermarkwarning

windowed-aggregation-without-watermark

Event-time windows need a watermark to know when a window is complete. Without one the processor either waits forever or closes windows early and silently drops late events.

— all of these hold:
— the node's `windowing` is "event-time"
— the node's `watermarkSeconds` has no value

Use it in a design

nodes:
  - { id: "nifi", component: "nifi" }

Other Stream processor products · 33

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Source

1# yaml-language-server: $schema=../../schema/component.schema.json
2# Apache NiFi: dataflow engine. Guaranteed delivery rests on "a purpose-built persistent write-ahead
3# log and content repository", queues apply back pressure at configured limits, and clustering is the
4# optional Zero-Leader paradigm coordinated by ZooKeeper ("Apache NiFi Overview"). Runs standalone in a
5# JVM by default; NiFi 2.x binds to 127.0.0.1 when no security configuration is provided.
6schemaVersion: "1"
7type: "component"
8id: "nifi"
9kind: "stream-processor"
10provider: "default"
11docs: "https://nifi.apache.org/nifi-docs/overview.html"
12defaults:
13  managed: false
14  windowing: "none"
15  exactlyOnce: false
16  stateBackend: "external"
17properties:
18  clustered:
19    type: "boolean"
20    default: false
21  backPressure:
22    type: "boolean"
23    default: true
24  provenanceRepository:
25    type: "boolean"
26    default: true

The same page as markdown, for an agent: /catalogue/components/nifi.md