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Splout is a read only, horizontally scalable SQL database that plays well with Hadoop.

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package com.splout.db.examples;

/*
 * #%L
 * Splout SQL Hadoop library
 * %%
 * Copyright (C) 2012 Datasalt Systems S.L.
 * %%
 * Licensed 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.
 * #L%
 */

import org.mortbay.jetty.Server;
import org.mortbay.jetty.servlet.DefaultServlet;
import org.mortbay.jetty.servlet.ServletHolder;
import org.mortbay.jetty.webapp.WebAppContext;
import org.mortbay.resource.Resource;
import org.mortbay.resource.ResourceCollection;

import com.beust.jcommander.JCommander;
import com.beust.jcommander.Parameter;
import com.beust.jcommander.ParameterException;
import com.splout.db.common.SploutClient;

/**
 * Front-end for the Wikipedia pagecounts example.
 */
public class PageCountsWebapp {

	@Parameter(names = { "-p", "--port" }, description = "The port the webapp will run on.")
	Integer port = 8080;

	@Parameter(names = { "-q", "--qnodes" }, description = "The QNodes this demo will use, comma-separated.")
	String qNodes = "http://localhost:4412";
	
	public void run() throws Exception {
		Server server = new Server(port);

		WebAppContext context = new WebAppContext();
		context.setContextPath("/");
		context.addServlet(new ServletHolder(new DefaultServlet()), "/pagecounts/*");
		context.addServlet(new ServletHolder(new PageCountsServlet(new SploutClient(qNodes.split(",")))), "/api");
		context.addServlet(new ServletHolder(new PageCountsTrendingServlet()), "/trends");

		ResourceCollection resources = new ResourceCollection(new String[] { Resource.newClassPathResource(
		    "pagecounts").toString() });

		context.setBaseResource(resources);

		server.setHandler(context);
		server.start();

		try {
			while(true) {
				Thread.sleep(5000);
			}
		} catch(InterruptedException e) {
			e.printStackTrace();
			server.stop();
		}
	}

	public static void main(String[] args) {
		PageCountsWebapp webapp = new PageCountsWebapp();
		JCommander jComm = new JCommander(webapp);
		jComm.setProgramName("Page Counts Splout Example Webapp");
		try {
			jComm.parse(args);
			webapp.run();
		} catch(ParameterException e) {
			System.err.println(e.getMessage());
			jComm.usage();
			System.exit(-1);
		} catch(Throwable t) {
			t.printStackTrace();
			jComm.usage();
			System.exit(-1);
		}
	}
}