Copilot commented on code in PR #7170:
URL: https://github.com/apache/hbase/pull/7170#discussion_r2232988091
##########
hbase-balancer/src/main/java/org/apache/hadoop/hbase/master/balancer/CostFunction.java:
##########
@@ -118,10 +118,6 @@ protected static double scale(double min, double max,
double value) {
) {
return 0;
}
- if (max <= min || Math.abs(max - min) <= costEpsilon) {
- return 0;
- }
-
return Math.max(0d, Math.min(1d, (value - min) / (max - min)));
Review Comment:
After removing the redundant condition check, this line could now cause
division by zero when `max == min`. The removed condition was protecting
against this case when `Math.abs(max - min) <= costEpsilon`, but the preceding
condition only checks `Math.abs(max - min) < costEpsilon` (with strict
inequality). When `Math.abs(max - min) == costEpsilon`, the division `(value -
min) / (max - min)` could result in division by a very small number close to
zero, potentially causing numerical instability.
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