tomscut commented on a change in pull request #3062:
URL: https://github.com/apache/hadoop/pull/3062#discussion_r644527141
##########
File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NetworkTopologyServlet.java
##########
@@ -171,7 +171,7 @@ private void printTextFormat(PrintStream stream, Map<String,
}
@VisibleForTesting
- static String parseAcceptHeader(HttpServletRequest request) {
+ protected static String parseAcceptHeader(HttpServletRequest request) {
Review comment:
> Package visible is not enough for using it in the other one?
This is calling the superclass
method(org.apache.hadoop.hdfs.server.namenode.parseAcceptHeader()) directly,
not on the instance of the superclass, so I make it protected. Do you think it
is necessary to change it to public?
##########
File path:
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterNetworkTopologyServlet.java
##########
@@ -0,0 +1,116 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hdfs.server.federation.router;
+
+import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
+import org.apache.hadoop.hdfs.protocol.HdfsConstants;
+import org.apache.hadoop.hdfs.server.namenode.NetworkTopologyServlet;
+import org.apache.hadoop.net.Node;
+import org.apache.hadoop.util.StringUtils;
+
+import javax.servlet.ServletContext;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.io.PrintStream;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.TreeSet;
+
+/**
+ * A servlet to print out the network topology from router.
+ */
+public class RouterNetworkTopologyServlet extends NetworkTopologyServlet {
+
+ public static final String SERVLET_NAME = "topology";
+ public static final String PATH_SPEC = "/topology";
+
+ protected static final String FORMAT_JSON = "json";
+ protected static final String FORMAT_TEXT = "text";
+
+ @Override
+ public void doGet(HttpServletRequest request, HttpServletResponse response)
+ throws IOException {
+ final ServletContext context = getServletContext();
+
+ String format = parseAcceptHeader(request);
Review comment:
Hi @goiri . This is calling the superclass
method(org.apache.hadoop.hdfs.server.namenode.parseAcceptHeader()) directly,
not on the instance of the superclass, so that's right for protected access
rights on superclass. What do you think?
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