rreddy-22 commented on code in PR #14099:
URL: https://github.com/apache/kafka/pull/14099#discussion_r1276710063


##########
group-coordinator/src/test/java/org/apache/kafka/coordinator/group/RecordHelpersTest.java:
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@@ -764,4 +813,39 @@ public void testNewOffsetCommitTombstoneRecord() {
         Record record = 
RecordHelpers.newOffsetCommitTombstoneRecord("group-id", "foo", 1);
         assertEquals(expectedRecord, record);
     }
+
+    // For the purpose of testing let:
+    //  a) Number of replicas for each partition = 2
+    //  b) Number of racks available in the cluster = 4

Review Comment:
   Its applicable to both the mkMapOfPartitionRacks and mkListOfPartitionRacks 
methods to show why there's two rackIds in each set and why the mod is 4. I got 
confused when I saw the old tests and didn't understand why a certain 
calculation was made and what the assumptions behind it were. I initially added 
it to the javadoc for the first method but realised it probably doesn't belong 
there. I'm not sure if I should place it inside the method for both or where 
the correct placement would be



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