szetszwo commented on code in PR #9587:
URL: https://github.com/apache/ozone/pull/9587#discussion_r2662170250
##########
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;
}
- // Find dst
+ // Determine source volume: highest utilization volume (if above
threshold)
+ final VolumeFixedUsage src = highestUsage;
+
+ // Find destination volume: lowest utilization volume that has enough
space
+ // Prefer volumes below threshold, but accept any volume with lower
utilization than source
for (int i = 0; i < volumeUsages.size() - 1; i++) {
Review Comment:
We should loop both src and dst.
```java
for (int s = volumeUsages.size() - 1; s > 0; s--) {
for (int d = 0; d < s; d++) {
final VolumeFixedUsage srcUsage = volumeUsages.get(s);
final VolumeFixedUsage dstUsage = volumeUsages.get(d);
if (srcUsage.getUtilization() < upperThreshold &&
dstUsage.getUtilization() > lowerThreshold) {
break; // within thresholds
}
final HddsVolume dst = dstUsage.getVolume();
if (containerSize < dstUsage.computeUsableSpace()) {
// Found dst, reserve space and return
dst.incCommittedBytes(containerSize);
return Pair.of(srcUsage.getVolume(), dst);
}
LOG.debug("Destination volume {} does not have enough space,
trying next volume.",
dst.getStorageID());
}
}
```
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