Pankaj260100 commented on code in PR #15141:
URL: https://github.com/apache/druid/pull/15141#discussion_r1373248898


##########
indexing-service/src/main/java/org/apache/druid/indexing/seekablestream/SeekableStreamEndSequenceNumbers.java:
##########
@@ -147,6 +148,40 @@ public SeekableStreamSequenceNumbers<PartitionIdType, 
SequenceOffsetType> plus(
     }
   }
 
+  @Override
+  public int compareTo(SeekableStreamSequenceNumbers<PartitionIdType, 
SequenceOffsetType> other)
+  {
+    if (this.getClass() != other.getClass()) {
+      throw new IAE(
+          "Expected instance of %s, got %s",
+          this.getClass().getName(),
+          other.getClass().getName()
+      );
+    }
+
+    final SeekableStreamEndSequenceNumbers<PartitionIdType, 
SequenceOffsetType> otherStart =
+        (SeekableStreamEndSequenceNumbers<PartitionIdType, 
SequenceOffsetType>) other;
+
+    if (stream.equals(otherStart.stream)) {
+      //Same stream, compare the offset
+      AtomicReference<Boolean> res = new AtomicReference<>(false);
+      partitionSequenceNumberMap.forEach(
+          (partitionId, sequenceOffset) -> {
+            if (otherStart.partitionSequenceNumberMap.get(partitionId) != null 
&& Long.parseLong(String.valueOf(sequenceOffset)) > 
Long.parseLong(String.valueOf(otherStart.partitionSequenceNumberMap.get(partitionId))))
 {

Review Comment:
   No, OrderedSequenceNumber does not have implementation to compare. 



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