[GitHub] [ozone] adoroszlai commented on a change in pull request #3121: HDDS-6357. Fix EpochEntry compareTo logic

[GitBox <gi...@apache.org>]

adoroszlai commented on a change in pull request #3121:
URL: https://github.com/apache/ozone/pull/3121#discussion_r811406249



##########
File path: hadoop-hdds/framework/src/main/java/org/apache/hadoop/hdds/utils/db/cache/EpochEntry.java
##########
@@ -64,6 +64,9 @@ public int hashCode() {
   @Override
   public int compareTo(Object o) {
     if (this.epoch == ((EpochEntry<?>)o).epoch) {
+      if (this.cachekey != ((EpochEntry<?>)o).cachekey) {
+        return -1;

Review comment:
       > The implementor must ensure sgn(x.compareTo(y)) == -sgn(y.compareTo(x)) for all x and y.
   
   In other words, we cannot return -1 unconditionally in this case.




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