sijie commented on a change in pull request #4738: [Transaction][buffer] Add 
basic operation of transaction
URL: https://github.com/apache/pulsar/pull/4738#discussion_r305668220
 
 

 ##########
 File path: 
pulsar-transaction/buffer/src/main/java/org/apache/pulsar/transaction/buffer/impl/InMemTransactionBuffer.java
 ##########
 @@ -79,6 +81,41 @@ public int numEntries() {
             }
         }
 
+        @Override
+        public long committedAtLedgerId() {
+            return committedAtLedgerId;
+        }
+
+        @Override
+        public long committedAtEntryId() {
+            return committedAtEntryId;
+        }
+
+        @Override
+        public long lastSequenceId() {
+            return entries.lastKey();
+        }
+
+        @Override
+        public CompletableFuture<SortedMap<Long, Position>> readEntries(int 
num, long startSequenceId) {
+            return FutureUtil.failedFuture(new 
UnsupportedOperationException());
 
 Review comment:
   It is trivial to implement this method. So please implement it.

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