yuanlihan commented on a change in pull request #9905:
URL: https://github.com/apache/druid/pull/9905#discussion_r436249451



##########
File path: 
indexing-service/src/main/java/org/apache/druid/indexing/common/task/CompactionTask.java
##########
@@ -524,10 +524,28 @@ private String createIndexTaskSpecId(int i)
                                  .add(p)
       );
 
-      final List<ParallelIndexIngestionSpec> specs = new 
ArrayList<>(intervalToSegments.size());
-      for (Entry<Interval, List<Pair<QueryableIndex, DataSegment>>> entry : 
intervalToSegments.entrySet()) {
-        final Interval interval = entry.getKey();
-        final List<Pair<QueryableIndex, DataSegment>> segmentsToCompact = 
entry.getValue();
+      // unify overlapping intervals to ensure overlapping segments compacting 
in the same indexSpec
+      List<Pair<Interval, List<Pair<QueryableIndex, DataSegment>>>> 
intervalToSegmentsUnified = new ArrayList<>();
+      Iterator<Interval> iterator = intervalToSegments.keySet().iterator();
+      Interval union = iterator.next();
+      List<Pair<QueryableIndex, DataSegment>> segments = new 
ArrayList<>(intervalToSegments.get(union));

Review comment:
       fixed CI failure.




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