sijie commented on a change in pull request #1121: [Merge Yahoo repo]: 
AsyncReadLastEntry should trigger callback with error when ledger is empty
URL: https://github.com/apache/bookkeeper/pull/1121#discussion_r168240944
 
 

 ##########
 File path: 
bookkeeper-server/src/main/java/org/apache/bookkeeper/client/LedgerHandle.java
 ##########
 @@ -787,6 +788,35 @@ public void onFailure(Throwable cause) {
         }
     }
 
+    /*
+     * Read the last entry in the ledger
+     *
+     * @param cb
+     *            object implementing read callback interface
+     * @param ctx
+     *            control object
+     */
+    public void asyncReadLastEntry(ReadCallback cb, Object ctx) {
+        long lastEntryId = getLastAddConfirmed();
+        if (lastEntryId < 0) {
+            // Ledger was empty, so there is no last entry to read
+            cb.readComplete(BKException.Code.NoSuchEntryException, this, null, 
ctx);
+        } else {
+            asyncReadEntriesInternal(lastEntryId, lastEntryId, cb, ctx);
+        }
+    }
+
+    public org.apache.bookkeeper.client.api.LedgerEntry readLastEntry()
+        throws InterruptedException, ExecutionException {
+        long lastEntryId = getLastAddConfirmed();
+        if (lastEntryId < 0) {
+            // Ledger was empty, so there is no last entry to read
+            return null;
 
 Review comment:
   throw NoSuchEntryException to keep it consistent with asyncReadLastEntry.

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