Rate limit write load decider logging #3
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Summary of ChangesHello @visz11, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly refines the logging behavior of the write load decider by introducing a configurable rate-limiting mechanism for debug messages and removing trace-level logging entirely. The primary goal is to reduce log verbosity and prevent log spam, thereby improving the clarity and utility of system logs without sacrificing critical debug information, which will now be presented at a controlled frequency. Highlights
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Note Other AI code review bot(s) detectedCodeRabbit has detected other AI code review bot(s) in this pull request and will avoid duplicating their findings in the review comments. This may lead to a less comprehensive review. WalkthroughAdds a new dynamic node-scoped setting for minimum logging interval of write-load interventions, wires it into ClusterSettings, and updates WriteLoadConstraintDecider to use a rate-limited logging mechanism guarded by debug checks. Direct debug/trace logs are replaced with FrequencyCappedAction.maybeExecute calls. Changes
Sequence Diagram(s)sequenceDiagram
participant Caller as Allocation Engine
participant Decider as WriteLoadConstraintDecider
participant Capper as FrequencyCappedAction (rate limiter)
participant Logger as Logger
participant CSettings as ClusterSettings
rect rgb(245,248,255)
note over Decider,CSettings: Initialization and dynamic updates
Decider->>CSettings: initializeAndWatch(min_log_interval)
CSettings-->>Decider: Notify on setting change (dynamic)
Decider->>Capper: Update minimum interval
end
rect rgb(245,255,245)
note over Caller,Logger: Rate-limited intervention logging during decisions
Caller->>Decider: canAllocate()/canRemain(...)
alt debug logging enabled
Decider->>Capper: maybeExecute(() -> Logger.debug(...))
Capper-->>Logger: Execute if interval elapsed
Capper-->>Decider: Suppress if within interval
else debug disabled
Decider-->>Caller: Skip logging
end
Decider-->>Caller: Return decision (unchanged)
end
Estimated code review effort🎯 2 (Simple) | ⏱️ ~10 minutes Poem
Pre-merge checks and finishing touches❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
✨ Finishing touches
🧪 Generate unit tests (beta)
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Code Review
This pull request introduces rate-limiting for the write load decider's debug logging to prevent log spam, which is a sensible improvement. A new dynamic cluster setting is added to control the logging interval, with a default of one minute. The implementation uses FrequencyCappedAction correctly. I've left one suggestion to reduce code duplication by extracting the new logging logic into a helper method. The removal of the trace logging is also a reasonable simplification.
| if (logger.isDebugEnabled()) { | ||
| logInterventionMessage.maybeExecute(() -> logger.debug(explain)); | ||
| } |
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This rate-limited logging logic is duplicated in three places within this class (here, lines 110-112, and 160-162). To improve maintainability and reduce code duplication, consider extracting this logic into a private helper method.
For example, you could add:
private void maybeLogIntervention(String explanation) {
if (logger.isDebugEnabled()) {
logInterventionMessage.maybeExecute(() -> logger.debug(explanation));
}
}And then replace the duplicated blocks with a call to maybeLogIntervention(explain);.
Pull Request Feedback 🔍
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| /** | ||
| * The minimum amount of time between logging messages about write load decider interventions | ||
| */ | ||
| public static final Setting<TimeValue> WRITE_LOAD_DECIDER_MINIMUM_LOGGING_INTERVAL = Setting.timeSetting( | ||
| SETTING_PREFIX + "log_interval", | ||
| TimeValue.timeValueMinutes(1), | ||
| Setting.Property.Dynamic, | ||
| Setting.Property.NodeScope | ||
| ); |
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Suggestion: Ensure the class API surface includes access to the new setting by exposing getMinimumLoggingInterval() and make the stored value updateable by adding an initializeAndWatch call in the constructor to update minimumLoggingInterval. [maintainability]
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Multi-Domain Review: Logging👍 Well Done
📁 Selected files for review (3)
🎯 Custom Instructions
📝 Additional Comments
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| public WriteLoadConstraintDecider(ClusterSettings clusterSettings) { | ||
| this.writeLoadConstraintSettings = new WriteLoadConstraintSettings(clusterSettings); | ||
| logInterventionMessage = new FrequencyCappedAction(System::currentTimeMillis, TimeValue.ZERO); |
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System Clock Dependency
System::currentTimeMillis creates direct dependency on system clock which can cause issues during clock adjustments or in testing environments. Clock changes can break rate limiting behavior and make testing non-deterministic.
Standards
- ISO-25010 Time Behaviour
- Clean Code Testability
| import org.elasticsearch.common.settings.ClusterSettings; | ||
| import org.elasticsearch.core.Strings; | ||
| import org.elasticsearch.core.TimeValue; | ||
| import org.elasticsearch.threadpool.ThreadPool; |
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ThreadPool Injection Opportunity
ThreadPool is imported but not used in constructor while System::currentTimeMillis is used directly. ThreadPool.relativeTimeInMillis() would provide consistent time source and better testability.
Standards
- SOLID Dependency Inversion
- Clean Code Consistency
2 participants
User description
We need to prevent this logging being too spammy.
I also removed the trace logging because it seems confusing that we'd have potentially very spammy trace logging, but limited debug logging? I don't know if it provides a lot of value in any case?
Open to applying rate limiting ONLY when trace is not enabled if we think there's value in keeping the trace messages?
CodeAnt-AI Description
Rate-limit write-load decider debug logs and remove trace messages
What Changed
Impact
✅ Fewer debug log entries✅ Lower log disk usage during heavy write load✅ Reduced logging noise for hot-node interventions💡 Usage Guide
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