hadoop RouterNetworkTopologyServlet 源码
haddop RouterNetworkTopologyServlet 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterNetworkTopologyServlet.java
/**
* 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.Arrays;
import java.util.List;
/**
* A servlet to print out the network topology from router.
*/
public class RouterNetworkTopologyServlet extends NetworkTopologyServlet {
@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);
List<Node> datanodeInfos = Arrays.asList(datanodeReport);
try (PrintStream out = new PrintStream(
response.getOutputStream(), false, "UTF-8")) {
printTopology(out, datanodeInfos, 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();
}
}
}
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