Apache Storm

Distributed topology of spouts and bolts with acked at-least-once tuple processing.

Provider: default
Kind: Stream processor
Category: Messaging
Official docs: https://storm.apache.org/releases/current/Guaranteeing-message-processing.html

Properties · 4 set by this component

property	type	values	required	kind default	this component
acking · component property	boolean	—	no	true	inherited
api · component property	enum	core \| trident \| streams	no	core	inherited
checkpointIntervalSeconds	integer	—	no	—	inherited
exactlyOnce	boolean	—	no	false	▸ false
instances	integer	—	no	—	inherited
lateDataPolicy	enum	drop \| shift \| sideline	no	—	inherited
managed	boolean	—	no	false	▸ false
messageTimeoutSeconds · component property	integer	—	no	30	inherited
stateBackend	enum	memory \| rocksdb \| external	no	memory	▸ memory
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: "storm", component: "storm" }

Other Stream processor products · 33

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Source

1# yaml-language-server: $schema=../../schema/component.schema.json
2# Apache Storm: topology of spouts and bolts. Core Storm acks tuple trees for at-least-once delivery,
3# with the tuple timeout defaulting to 30 seconds and at-most-once obtained by setting
4# TOPOLOGY_ACKERS to 0; exactly-once is only available through Trident
5# ("Apache Storm, Guaranteeing Message Processing").
6schemaVersion: "1"
7type: "component"
8id: "storm"
9kind: "stream-processor"
10provider: "default"
11docs: "https://storm.apache.org/releases/current/Guaranteeing-message-processing.html"
12defaults:
13  managed: false
14  windowing: "none"
15  exactlyOnce: false
16  stateBackend: "memory"
17properties:
18  acking:
19    type: "boolean"
20    default: true
21  messageTimeoutSeconds:
22    type: "integer"
23    default: 30
24  api:
25    type: "enum"
26    values: ["core", "trident", "streams"]
27    default: "core"

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