Event Ordering

Kind: constraint

Layer: Causality Core

Record: architecture:event-ordering

Severity: contextual

Scope: stream, queue, consumer

Canonical: Ontology

A rule or precondition that a stateful consumer processes the events of one key in their sequence order.

Listed in Architecture principles, after Happens-Before Relationship and before Causal Dependency.

Requires

• Ordering Key or Sequence

Reinforces

• Causality

Enables

• Correct Stateful Processing

Conflicts with

• Unordered Parallel Consumption

In tension with

• Throughput

Tensions

• Event Ordering / Throughput

Violated by

• Unordered Parallel Consumption

Refactored by

• Partitioning
• Logical Counter
• Reorder Buffer

Severity

• contextual

Category

• Causality / Ordering / Distributed Time

Reinforced by

• Hybrid Logical Clocks
• Total-Order Broadcast

Linked from

• Orchestration as declared structure
• The board and the venue
• One chain
• Execution joins the halves
• Causality / Ordering / Distributed Time
• Scalability / Performance / Optimization
• Causality / Ordering / Distributed Time
• Severity levels
• The resolutions