LeBW commented on a change in pull request #12523:
URL: https://github.com/apache/pulsar/pull/12523#discussion_r741726849



##########
File path: 
managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java
##########
@@ -1141,6 +1143,48 @@ public long getEstimatedBacklogSize() {
         }
     }
 
+    @Override
+    public long getEarliestMessagePublishTimeInBacklog() {
+        PositionImpl pos = getMarkDeletePositionOfSlowestConsumer();
+
+        return getEarliestMessagePublishTimeOfPos(pos);
+    }
+
+    public long getEarliestMessagePublishTimeOfPos(PositionImpl pos) {
+        if (pos == null) {
+            return 0L;
+        }
+        PositionImpl nextPos = getNextValidPosition(pos);
+
+        CompletableFuture<Long> future = new CompletableFuture<>();
+        asyncReadEntry(nextPos, new ReadEntryCallback() {
+            @Override
+            public void readEntryComplete(Entry entry, Object ctx) {

Review comment:
       Fixed




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