title: What database options are available for Nutch 2.1?
body: <p>I'm trying to test out Nutch 2.1 on a single Windows machine. The following command dies:</p>
  
  <pre><code>nutch crawl seeds -dir crawl -solr http://somehost:8983/solr -depth 2 -topN 2
  </code></pre>
  
  <p>...with a traceback of several exceptions:</p>
  
  <ul>
  <li><code>java.net.ConnectionException: Connection refused</code></li>
  <li><code>GoraException</code></li>
  <li><code>SQLTransientConnectionException</code></li>
  <li><code>org.hsqldb.HsqlException</code></li>
  </ul>
  
  <p>This is the same problem as this post: <a href="https://stackoverflow.com/questions/12581492/connection-refused-error-when-running-nutch-2">connection refused error when running Nutch 2</a></p>
  
  <p>It looks like Nutch 2 wants some kind of database already installed, but there's no mention of that in the (sparse) documentation that I can see.</p>
  
  <p>The production environment will eventually be a linux/Hadoop cluster, but for the moment I'm just trying to get a simple local system to work out of the box.</p>
  
  <p>So what options are there for a simple Nutch database? How do you tell Nutch and Gora about the database? HBase might be a good answer as soon as we have our Hadoop cluster up and running. However; in the meantime is there a simple, even slow, database that will work for initial exploration on a single system?</p>