michaeljmarshall commented on code in PR #15067:
URL: https://github.com/apache/pulsar/pull/15067#discussion_r848638415


##########
managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedCursorImpl.java:
##########
@@ -1793,6 +1830,34 @@ protected void internalAsyncMarkDelete(final 
PositionImpl newPosition, Map<Strin
     }
 
     void internalMarkDelete(final MarkDeleteEntry mdEntry) {
+        if (persistentMarkDeletePosition != null
+                && mdEntry.newPosition.compareTo(persistentMarkDeletePosition) 
< 0) {
+            if (log.isInfoEnabled()) {
+                log.info("Skipping updating mark delete position to {}. The 
persisted mark delete position {} "
+                        + "is latest.", mdEntry.newPosition, 
persistentMarkDeletePosition);
+            }
+            mdEntry.triggerComplete();
+            return;
+        }
+
+        PositionImpl inProgressLatest = 
INPROGRESS_MARKDELETE_PERSIST_POSITION_UPDATER.updateAndGet(this, current -> {
+            if (current != null && current.compareTo(mdEntry.newPosition) > 0) 
{
+                return current;
+            } else {
+                return mdEntry.newPosition;
+            }
+        });
+
+        // if there's a newer or equal mark delete update in progress, skip it.
+        if (inProgressLatest != mdEntry.newPosition) {
+            if (log.isInfoEnabled()) {
+                log.info("Skipping updating mark delete position to {}. The 
mark delete position update "
+                        + "in progress {} is latest.", mdEntry.newPosition, 
inProgressLatest);

Review Comment:
   Nit: I think we might want to replace `latest` with `later` because `latest` 
already has a meaning for a subscription.



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