Principle:Apache Kafka Coordinator Write Operations
| Knowledge Sources | |
|---|---|
| Domains | Distributed_Systems, State_Management |
| Last Updated | 2026-02-09 12:00 GMT |
Overview
An event-driven write mechanism that applies state mutations to the coordinator through record generation and partition append.
Description
Coordinator Write Operations are the primary mechanism for modifying coordinator state. A write operation is a function that takes the current coordinator state and produces records. These records are appended to the coordinator's partition log via PartitionWriter, and the resulting future completes when the records are committed (i.e., the high watermark advances past them). The coordinator state is updated optimistically and reverted if the append fails.
Usage
Use this principle to understand how coordinator state changes are made durable. All state mutations go through write operations.
Theoretical Basis
- Record Generation: The write operation lambda generates records from the current coordinator state.
- Optimistic Apply: Records are applied to the in-memory state before being committed.
- Log Append: Records are serialized and appended to the partition via PartitionWriter.append.
- Completion: The future completes when the high watermark advances past the appended records, confirming durability.
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