Fan-out/Fan-in

Kind: pattern

Layer: Execution Core

Aliases: Upward Reduction

Record: architecture:fan-out-fan-in

Severity: contextual

Scope: data processing, parallelism, pipeline

Canonical: Ontology

A design pattern that splits work into independent parts processed in parallel, then merges their results.

Listed in Architecture principles, after Windowing and before Batch-vs-Stream.

Requires

• Independent Work Units

Reinforces

• Parallelism
• Throughput

Enables

• Parallel Branch Processing
• Result Aggregation

In tension with

• Coordination Overhead
• Serial Item Processing

Tensions

• Fan-out/Fan-in / Coordination Overhead
• Fan-out/Fan-in / Serial Item Processing

Violated by

• Sequential Bottleneck

Severity

• contextual

Category

• Streaming / Pipeline / Dataflow Processing

Linked from

• Above one tier, reduction
• Scalability / Performance / Optimization
• Core Vocabulary
• Quality Attributes
• Scalability / Performance / Optimization
• Streaming / Pipeline / Dataflow Processing
• Severity levels
• The resolutions