/**
* Select a datanode to service this request. Currently, this looks at no more than the first five
* blocks of a file, selecting a datanode randomly from the most represented.
*
* @param conf
*/
private DatanodeID pickSrcDatanode(LocatedBlocks blks, HdfsFileStatus i, Configuration conf)
throws IOException {
if (i.getLen() == 0 || blks.getLocatedBlocks().size() <= 0) {
// pick a random datanode
NameNode nn = NameNodeHttpServer.getNameNodeFromContext(getServletContext());
return NamenodeJspHelper.getRandomDatanode(nn);
}
return JspHelper.bestNode(blks, conf);
}
public void _jspService(HttpServletRequest request, HttpServletResponse response)
throws java.io.IOException, ServletException {
JspFactory _jspxFactory = null;
PageContext pageContext = null;
HttpSession session = null;
ServletContext application = null;
ServletConfig config = null;
JspWriter out = null;
Object page = this;
JspWriter _jspx_out = null;
PageContext _jspx_page_context = null;
try {
_jspxFactory = JspFactory.getDefaultFactory();
response.setContentType("text/html; charset=UTF-8");
pageContext = _jspxFactory.getPageContext(this, request, response, null, true, 8192, true);
_jspx_page_context = pageContext;
application = pageContext.getServletContext();
config = pageContext.getServletConfig();
session = pageContext.getSession();
out = pageContext.getOut();
_jspx_out = out;
/*
* 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.
*/
out.write('\n');
out.write('\n');
out.write('\n');
final NamenodeJspHelper.NodeListJsp nodelistjsp = new NamenodeJspHelper.NodeListJsp();
NameNode nn = (NameNode) application.getAttribute("name.node");
String namenodeRole = nn.getRole().toString();
FSNamesystem fsn = nn.getNamesystem();
String namenodeLabel =
nn.getNameNodeAddress().getHostName() + ":" + nn.getNameNodeAddress().getPort();
out.write(
"\n\n<html>\n\n<link rel=\"stylesheet\" type=\"text/css\" href=\"/static/hadoop.css\">\n<title>Hadoop ");
out.print(namenodeRole);
out.write(' ');
out.print(namenodeLabel);
out.write("</title>\n \n<body>\n<h1>");
out.print(namenodeRole);
out.write(' ');
out.write('\'');
out.print(namenodeLabel);
out.write("'</h1>\n");
out.print(NamenodeJspHelper.getVersionTable(fsn));
out.write(
"\n<br />\n<b><a href=\"/nn_browsedfscontent.jsp\">Browse the filesystem</a></b><br>\n<b><a href=\"/logs/\">");
out.print(namenodeRole);
out.write(
" Logs</a></b><br>\n<b><a href=/dfshealth.jsp> Go back to DFS home</a></b>\n<hr>\n");
nodelistjsp.generateNodesList(out, nn, request);
out.write('\n');
out.write('\n');
out.println(ServletUtil.htmlFooter());
out.write('\n');
} catch (Throwable t) {
if (!(t instanceof SkipPageException)) {
out = _jspx_out;
if (out != null && out.getBufferSize() != 0) out.clearBuffer();
if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);
}
} finally {
if (_jspxFactory != null) _jspxFactory.releasePageContext(_jspx_page_context);
}
}