dajac commented on code in PR #14067:
URL: https://github.com/apache/kafka/pull/14067#discussion_r1274530527


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/OffsetAndMetadata.java:
##########
@@ -114,12 +116,29 @@ public static OffsetAndMetadata fromRecord(
     ) {
         return new OffsetAndMetadata(
             record.offset(),
-            record.leaderEpoch() == RecordBatch.NO_PARTITION_LEADER_EPOCH ?
-                OptionalInt.empty() : OptionalInt.of(record.leaderEpoch()),
+            ofSentinel(record.leaderEpoch()),
             record.metadata(),
             record.commitTimestamp(),
-            record.expireTimestamp() == OffsetCommitRequest.DEFAULT_TIMESTAMP ?
-                OptionalLong.empty() : 
OptionalLong.of(record.expireTimestamp())
+            ofSentinel(record.expireTimestamp())
+        );
+    }
+
+    /**
+     * @return An OffsetAndMetadata created from an 
OffsetCommitRequestPartition request.
+     */
+    public static OffsetAndMetadata fromRequest(
+        OffsetCommitRequestData.OffsetCommitRequestPartition partition,
+        long currentTimeMs,
+        OptionalLong expireTimestampMs
+    ) {
+        return new OffsetAndMetadata(
+            partition.committedOffset(),
+            ofSentinel(partition.committedLeaderEpoch()),
+            partition.committedMetadata() == null ?
+                OffsetAndMetadata.NO_METADATA : partition.committedMetadata(),
+            partition.commitTimestamp() == 
OffsetCommitRequest.DEFAULT_TIMESTAMP ?

Review Comment:
   In the record, we store the decided time (either current time or the 
provided one). We store a sentinel (-1) for the expire timestamp if not set 
though.



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