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From GitBox <...@apache.org>
Subject [GitHub] [hadoop] goiri commented on a change in pull request #3062: HDFS-16048. RBF: Print network topology on the router web
Date Tue, 01 Jun 2021 18:43:19 GMT

goiri commented on a change in pull request #3062:
URL: https://github.com/apache/hadoop/pull/3062#discussion_r643394337



##########
File path: hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterNetworkTopologyServlet.java
##########
@@ -0,0 +1,187 @@
+/**
+ * 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 com.fasterxml.jackson.core.JsonFactory;
+import com.fasterxml.jackson.core.JsonGenerator;
+import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
+import org.apache.hadoop.hdfs.protocol.HdfsConstants;
+import org.apache.hadoop.net.NetUtils;
+import org.apache.hadoop.net.Node;
+import org.apache.hadoop.thirdparty.com.google.common.annotations.VisibleForTesting;
+import org.apache.hadoop.util.StringUtils;
+
+import javax.servlet.ServletContext;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.ws.rs.core.HttpHeaders;
+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 HttpServlet {
+
+  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);
+    if (FORMAT_TEXT.equals(format)) {
+      response.setContentType("text/plain; charset=UTF-8");
+    } else if (FORMAT_JSON.equals(format)) {
+      response.setContentType("application/json; charset=UTF-8");
+    }
+
+    Router router = RouterHttpServer.getRouterFromContext(context);
+    DatanodeInfo[] datanodeReport =
+        router.getRpcServer().getDatanodeReport(
+            HdfsConstants.DatanodeReportType.ALL);
+
+    try (PrintStream out = new PrintStream(
+            response.getOutputStream(), false, "UTF-8")) {
+      printTopology(out, datanodeReport, format);
+    } 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 datanodeInfos datanode Infos
+   * @param format the response format
+   */
+  public void printTopology(PrintStream stream, DatanodeInfo[] datanodeInfos,
+      String format) throws IOException, BadFormatException {
+    if (datanodeInfos.length == 0) {
+      stream.print("No DataNodes");
+      return;
+    }
+
+    // Build a map of rack -> nodes
+    Map<String, TreeSet<String>> tree = new HashMap<>();
+    for(Node dni : datanodeInfos) {
+      String location = dni.getNetworkLocation();
+      String name = dni.getName();
+
+      tree.putIfAbsent(location, new TreeSet<>());
+      tree.get(location).add(name);
+    }
+
+    // Sort the racks (and nodes) alphabetically, display in order
+    ArrayList<String> racks = new ArrayList<>(tree.keySet());
+    Collections.sort(racks);
+
+    if (FORMAT_JSON.equals(format)) {
+      printJsonFormat(stream, tree, racks);
+    } else if (FORMAT_TEXT.equals(format)) {
+      printTextFormat(stream, tree, racks);
+    } else {
+      throw new BadFormatException("Bad format: " + format);
+    }
+  }
+
+  private void printJsonFormat(PrintStream stream, Map<String,
+          TreeSet<String>> tree, ArrayList<String> racks) throws IOException
{
+    JsonFactory dumpFactory = new JsonFactory();
+    JsonGenerator dumpGenerator = dumpFactory.createGenerator(stream);
+    dumpGenerator.writeStartArray();
+
+    for(String r : racks) {
+      dumpGenerator.writeStartObject();
+      dumpGenerator.writeFieldName(r);
+      TreeSet<String> nodes = tree.get(r);
+      dumpGenerator.writeStartArray();
+
+      for(String n : nodes) {
+        dumpGenerator.writeStartObject();
+        dumpGenerator.writeStringField("ip", n);
+        String hostname = NetUtils.getHostNameOfIP(n);
+        if(hostname != null) {
+          dumpGenerator.writeStringField("hostname", hostname);
+        }
+        dumpGenerator.writeEndObject();
+      }
+      dumpGenerator.writeEndArray();
+      dumpGenerator.writeEndObject();
+    }
+    dumpGenerator.writeEndArray();
+    dumpGenerator.flush();
+
+    if (!dumpGenerator.isClosed()) {
+      dumpGenerator.close();
+    }
+  }
+
+  private void printTextFormat(PrintStream stream, Map<String,

Review comment:
       Can we reuse some of this code from the other PR?




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