ZanderXu commented on code in PR #6784:
URL: https://github.com/apache/hadoop/pull/6784#discussion_r1598226242


##########
hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/TestRouterRpc.java:
##########
@@ -1224,6 +1239,26 @@ public void testProxyConcatFile() throws Exception {
     String badPath = "/unknownlocation/unknowndir";
     compareResponses(routerProtocol, nnProtocol, m,
         new Object[] {badPath, new String[] {routerFile}});
+
+    // Test when concat trg is a empty file
+    createFile(routerFS, existingFile, existingFileSize);
+    String sameRouterEmptyFile =
+        cluster.getFederatedTestDirectoryForNS(sameNameservice) +
+            "_newemptyfile";
+    createFile(routerFS, sameRouterEmptyFile, 0);
+    // Concat in same namespaces, succeeds
+    testConcat(existingFile, sameRouterEmptyFile, false);
+    FileStatus mergedStatus = getFileStatus(routerFS, sameRouterEmptyFile);
+    assertEquals(existingFileSize, mergedStatus.getLen());
+
+    // Test when concat srclist has some empty file, namenode will throw 
IOException.
+    String srcEmptyFile = 
cluster.getFederatedTestDirectoryForNS(sameNameservice) + "_srcEmptyFile";
+    createFile(routerFS, srcEmptyFile, 0);
+    String targetFile = 
cluster.getFederatedTestDirectoryForNS(sameNameservice) + "_targetFile";
+    createFile(routerFS, targetFile, existingFileSize);
+    // Concat in same namespaces, succeeds
+    testConcat(srcEmptyFile, targetFile, true, true,

Review Comment:
   here please check if the exception is 
`org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.HadoopIllegalArgumentException)`



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