HDFS-10417. Improve error message from checkBlockLocalPathAccess. Contributed by Tianyin Xu.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java

@@ -1717,7 +1717,8 @@ private void checkBlockLocalPathAccess() throws IOException {
       throw new AccessControlException(
           "Can't continue with getBlockLocalPathInfo() "
               + "authorization. The user " + currentUser
-              + " is not allowed to call getBlockLocalPathInfo");
+              + " is not configured in "
+              + DFSConfigKeys.DFS_BLOCK_LOCAL_PATH_ACCESS_USER_KEY);
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/shortcircuit/TestShortCircuitLocalRead.java

@@ -375,10 +375,12 @@ public void testDeprecatedGetBlockLocalPathInfoRpc() throws IOException {
       try {
         proxy.getBlockLocalPathInfo(blk, token);
         Assert.fail("The call should have failed as this user "
-            + " is not allowed to call getBlockLocalPathInfo");
+            + " is not configured in "
+            + DFSConfigKeys.DFS_BLOCK_LOCAL_PATH_ACCESS_USER_KEY);
       } catch (IOException ex) {
         Assert.assertTrue(ex.getMessage().contains(
-            "not allowed to call getBlockLocalPathInfo"));
+            "not configured in "
+            + DFSConfigKeys.DFS_BLOCK_LOCAL_PATH_ACCESS_USER_KEY));
       }
     } finally {
       fs.close();