narendly commented on a change in pull request #525: Add waged rebalancer
monitoring mbean metrics
URL: https://github.com/apache/helix/pull/525#discussion_r338370184
##########
File path:
helix-core/src/main/java/org/apache/helix/controller/rebalancer/waged/WagedRebalancer.java
##########
@@ -412,6 +430,61 @@ private void
refreshBaseline(ResourceControllerDataProvider clusterData,
return newAssignment;
}
+ private void
asyncReportBaselineDivergenceGauge(ResourceControllerDataProvider clusterData,
+ Map<String, ResourceAssignment> baseline,
+ Map<String, ResourceAssignment> bestPossibleAssignment) {
+ asyncExecute(clusterData.getAsyncTasksThreadPool(), () -> {
+ try {
+ reportBaselineDivergenceGauge(baseline, bestPossibleAssignment);
+ } catch (Exception e) {
+ LOG.error("Failed to report BaselineDivergenceGauge metric.", e);
+ }
+ return null;
+ });
+ }
+
+ private void reportBaselineDivergenceGauge(Map<String, ResourceAssignment>
baseline,
+ Map<String, ResourceAssignment> bestPossibleAssignment) {
+ double baselineDivergence = measureBaselineDivergence(baseline,
bestPossibleAssignment);
+
+ BaselineDivergenceGauge baselineDivergenceGauge =
_metricCollector.getMetric(
+
WagedRebalancerMetricCollector.WagedRebalancerMetricNames.BaselineDivergenceGauge.name(),
+ BaselineDivergenceGauge.class);
+
+ baselineDivergenceGauge.updateValue(baselineDivergence);
+ }
+
+ private double measureBaselineDivergence(Map<String, ResourceAssignment>
baseline,
Review comment:
+1. Some description would be very helpful.
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