ayushtkn commented on code in PR #4524:
URL: https://github.com/apache/hadoop/pull/4524#discussion_r912390702


##########
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcClient.java:
##########
@@ -1012,6 +1013,9 @@ public <R extends RemoteLocationContext, T> RemoteResult 
invokeSequential(
           // Valid result, stop here
           @SuppressWarnings("unchecked") R location = (R) loc;
           @SuppressWarnings("unchecked") T ret = (T) result;
+          if (ret instanceof LastBlockWithStatus) {
+            ((LastBlockWithStatus) ret).getFileStatus().setNamespace(ns);
+          }

Review Comment:
   Is this for append? Then No I don't think we should do this for all other 
API, should restrict our changes to only Append code.
   Check if changing the Append code in ``RouterClientProtocol`` helps:
   
   ```
     @Override
     public LastBlockWithStatus append(String src, final String clientName,
         final EnumSetWritable<CreateFlag> flag) throws IOException {
       rpcServer.checkOperation(NameNode.OperationCategory.WRITE);
   
       List<RemoteLocation> locations = rpcServer.getLocationsForPath(src, 
true);
       RemoteMethod method = new RemoteMethod("append",
           new Class<?>[] {String.class, String.class, EnumSetWritable.class},
           new RemoteParam(), clientName, flag);
       RemoteResult result = rpcClient
           .invokeSequential(method, locations, LastBlockWithStatus.class, 
null);
       LastBlockWithStatus lbws = (LastBlockWithStatus) result.getResult();
       
lbws.getFileStatus().setNamespace(result.getLocation().getNameserviceId());
       return lbws;
     }
   ```



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