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JIRA: Jira server ASF JIRA serverId 5aa69414-a9e9-3523-82ec-879b028fb15b key KAFKA-19791
Motivation
The MetadataLoader thread is responsible for consuming metadata from Raft and processing critical metadata updates, including metadata commits, snapshot loading, leader changes, and publisher management. Currently, there is no metric to measure how much time the MetadataLoader thread spends idle waiting for new metadata events versus actively processing themis a critical component in KRaft clusters that processes metadata changes from the Raft layer and distributes them to various publishers (brokers, controllers, etc.). However, unlike similar event-driven components such as the QuorumController and various coordinators, the MetadataLoader lacks the idle thread ratio metric for monitoring its event queue processing efficiency. This lack of visibility makes it challenging to assess the metadata processing pipeline's performance, detect potential bottlenecks in metadata propagation, or optimize resource allocation when metadata update frequency varies significantly.
Public Interfaces
Monitoring
| Name | Type | Description |
|---|---|---|
| kafka.metadata:type=MetadataLoader,name=AvgIdleRatio | TimeRatio | The idle ratio measures the proportion of time the The . This metric uses the existing The metric is calculated using the following formula and 's value ranges from 0 to 1, where 0 indicates the MetadataLoader thread is constantly processing metadata events without breaks, and 1 signifies the thread spends most of its time is almost always waiting for work. |
Compatibility, Deprecation, and Migration Plan
This KIP introduces a single new metric , with no changes to without modifying existing behavior, APIs, or protocols. This new metric will be available immediately after upgrader. There will be no impact on existing Kafka versions
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Unit tests will be added to verify the metrics.
Rejected Alternatives
If there are alternative ways of accomplishing the same thing, what were they? The purpose of this section is to motivate why the design is the way it is and not some other way.NA