KeeProMise commented on code in PR #7415:
URL: https://github.com/apache/hadoop/pull/7415#discussion_r1964648840


##########
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/async/RouterAsyncClientProtocol.java:
##########
@@ -1057,33 +1057,33 @@ public boolean setReplication(String src, short 
replication)
    *         subclusters else false in all other scenarios.
    * @throws IOException if unable to get the file status.
    */
+  @VisibleForTesting
   @Override
   public boolean isMultiDestDirectory(String src) throws IOException {
-    try {
+    asyncComplete(false);

Review Comment:
   Hi, @hfutatzhanghb don’t need to add this here. If the code inside the 
**asyncTry** block executes without any exceptions, a **CompletableFuture** 
containing **true** or **false** will definitely be set to the thread-local 
variable. If the **asyncTry** block throws an **UnresolvedPathException**, it 
can be caught by **asyncCatch** and a **CompletableFuture** containing 
**false** will be set to the thread-local variable. If the **asyncTry** block 
throws any **other exception**, a **CompletableFuture** containing that 
exception will be set to the thread-local variable for the outer method to 
handle, which is consistent with the original synchronous logic.



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