szetszwo commented on code in PR #9587:
URL: https://github.com/apache/ozone/pull/9587#discussion_r2662167754
##########
hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/diskbalancer/policy/DefaultVolumeChoosingPolicy.java:
##########
@@ -67,24 +67,41 @@ public Pair<HddsVolume, HddsVolume>
chooseVolume(MutableVolumeSet volumeSet,
.sorted(Comparator.comparingDouble(VolumeFixedUsage::getUtilization))
.collect(Collectors.toList());
- // Calculate the actual threshold and check src
- final double actualThreshold = getIdealUsage(volumeUsages) +
thresholdPercentage / 100;
- final VolumeFixedUsage src = volumeUsages.get(volumeUsages.size() - 1);
- if (src.getUtilization() < actualThreshold) {
- return null; // all volumes are under the threshold
+ // Calculate ideal usage and threshold range
+ final double idealUsage = getIdealUsage(volumeUsages);
+ final double actualThreshold = thresholdPercentage / 100.0;
+ final double lowerThreshold = idealUsage - actualThreshold;
+ final double upperThreshold = idealUsage + actualThreshold;
+
+ // Get highest and lowest utilization volumes
+ final VolumeFixedUsage highestUsage =
volumeUsages.get(volumeUsages.size() - 1);
+ final VolumeFixedUsage lowestUsage = volumeUsages.get(0);
+
+ // Only return null if highest is below upper threshold AND lowest is
above lower threshold
+ // This means all volumes are strictly within the range (not at
boundaries)
+ if (highestUsage.getUtilization() < upperThreshold &&
+ lowestUsage.getUtilization() > lowerThreshold) {
+ // All volumes are strictly within threshold range, no balancing needed
+ return null;
Review Comment:
👍 It is good to filter out this case first.
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