Principle:Apache Kafka Coordinator Read Operations
| Knowledge Sources | |
|---|---|
| Domains | Distributed_Systems, State_Management |
| Last Updated | 2026-02-09 12:00 GMT |
Overview
A consistent read mechanism that queries coordinator state at the last committed offset.
Description
Coordinator Read Operations query the coordinator's committed state without modifying it. Unlike write operations, reads complete immediately with the current committed state rather than waiting for the high watermark. The read is performed against the SnapshottableCoordinator at the last committed offset, ensuring read consistency.
Usage
Use this principle for all coordinator state queries that don't require modification. Read operations are cheaper than writes since they don't involve log appends.
Theoretical Basis
- Committed State: Reads execute against the state at the last committed offset (high watermark), not the latest speculative state.
- Immediate Completion: The future completes immediately after the read, unlike writes that wait for commit.
- No Side Effects: Read operations must not modify coordinator state or produce records.
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