Principle:Apache Kafka Coordinator Metadata Propagation
| Knowledge Sources | |
|---|---|
| Domains | Distributed_Systems, Metadata_Management |
| Last Updated | 2026-02-09 12:00 GMT |
Overview
A metadata distribution mechanism that propagates cluster metadata changes to all active coordinator instances.
Description
Coordinator Metadata Propagation updates coordinator instances when the cluster metadata changes (e.g., topic creation, broker changes). The runtime receives metadata deltas and new images from the KRaft controller, updates the global metadata image, and pushes an update event to each active coordinator. Only coordinators in the ACTIVE state receive updates.
Usage
Use this principle to understand how coordinators stay synchronized with cluster metadata changes. This is essential for coordinators that need to react to topology changes.
Theoretical Basis
- Delta-Based Updates: Metadata changes are delivered as deltas (what changed) along with the new complete image.
- Per-Coordinator Distribution: Each active coordinator receives its own update event to process independently.
- State Filtering: Only ACTIVE coordinators receive metadata updates; LOADING or CLOSED coordinators are skipped.
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Principle
Implementation
Heuristic
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