gaozhangmin commented on a change in pull request #10853:
URL: https://github.com/apache/pulsar/pull/10853#discussion_r648836062



##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/v2/PersistentTopics.java
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@@ -1458,6 +1458,33 @@ public PersistentOfflineTopicStats getBacklog(
         return internalGetBacklog(authoritative);
     }
 
+    @GET
+    
@Path("/{tenant}/{namespace}/{topic}/messageId/{messageId}/checkLedgerExists/{checkLedgerExists}/backlogSize")

Review comment:
        For partitioned-topic, We should return an error if ledger not exists 
on it. 
    But for  multi-partitions topic, We return an error only when ledger not 
exists on all partitions.  When calculate partitioned-topic  backlog size of 
this multi-partitions topic, We should't throw an error if if ledger not exists 
on partitioned-topic. So We need checkLedgerExists flag to judge different 
situations.




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