[
https://issues.apache.org/jira/browse/HDFS-15970?focusedWorklogId=581522&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-581522
]
ASF GitHub Bot logged work on HDFS-15970:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 13/Apr/21 03:47
Start Date: 13/Apr/21 03:47
Worklog Time Spent: 10m
Work Description: tomscut commented on a change in pull request #2896:
URL: https://github.com/apache/hadoop/pull/2896#discussion_r612106334
##########
File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NetworkTopologyServlet.java
##########
@@ -0,0 +1,115 @@
+/**
+ * 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.namenode;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.hdfs.server.blockmanagement.BlockManager;
+import org.apache.hadoop.net.NetUtils;
+import org.apache.hadoop.net.Node;
+import org.apache.hadoop.net.NodeBase;
+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.List;
+import java.util.TreeSet;
+
+/**
+ * A servlet to print out the network topology.
+ */
+@InterfaceAudience.Private
+public class NetworkTopologyServlet extends DfsServlet {
+
+ public static final String PATH_SPEC = "/topology";
+
+ @Override
+ public void doGet(HttpServletRequest request, HttpServletResponse response)
+ throws IOException {
+ final ServletContext context = getServletContext();
+ NameNode nn = NameNodeHttpServer.getNameNodeFromContext(context);
+ BlockManager bm = nn.getNamesystem().getBlockManager();
+ List<Node> leaves = bm.getDatanodeManager().getNetworkTopology()
+ .getLeaves(NodeBase.ROOT);
+
+ response.setContentType("text/plain; charset=UTF-8");
+ try (PrintStream out = new PrintStream(
+ response.getOutputStream(), false, "UTF-8")) {
+ printTopology(out, leaves);
+ } catch (Throwable t) {
+ String errMsg = "Print network topology failed. "
+ + StringUtils.stringifyException(t);
+ response.sendError(HttpServletResponse.SC_GONE, errMsg);
+ throw new IOException(errMsg);
+ } finally {
+ response.getOutputStream().close();
+ }
+ }
+
+ /**
+ * Display each rack and the nodes assigned to that rack, as determined
+ * by the NameNode, in a hierarchical manner. The nodes and racks are
+ * sorted alphabetically.
+ *
+ * @param stream print stream
+ * @param leaves leaves nodes under base scope
+ */
+ public void printTopology(PrintStream stream, List<Node> leaves) {
+ if (leaves.size() == 0) {
+ stream.print("No DataNodes");
+ return;
+ }
+
+ // Build a map of rack -> nodes from the datanode report
+ HashMap<String, TreeSet<String>> tree = new HashMap<String,
TreeSet<String>>();
+ for(Node dni : leaves) {
+ String location = dni.getNetworkLocation();
+ String name = dni.getName();
+
+ if(!tree.containsKey(location)) {
Review comment:
Thanks @goiri for your careful review, I will fix these problems quickly.
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Issue Time Tracking
-------------------
Worklog Id: (was: 581522)
Time Spent: 50m (was: 40m)
> Print network topology on the web
> ---------------------------------
>
> Key: HDFS-15970
> URL: https://issues.apache.org/jira/browse/HDFS-15970
> Project: Hadoop HDFS
> Issue Type: Wish
> Reporter: tomscut
> Assignee: tomscut
> Priority: Minor
> Labels: pull-request-available
> Attachments: hdfs-topology.jpg, hdfs-web.jpg
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> In order to query the network topology information conveniently, we can print
> it on the web.
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