Troubleshooting Solr

Do you have the Active Search feature of Javascript Tools enabled? There is a possible incompatibility with the ApacheSolr module and you should test with the Active Search feature turned off.

The devel module could also prevent the facet blocks from being shown.

• Add URIEncoding="UTF-8" to the correct Connector
• Be sure to remove useBodyEncodingForURI from that Connector

Be sure to restart Tomcat after making these changes.

This error indicates that the requests sent from Drupal to Solr are somehow invalid. One possible reason is that the requests are too long to be handled by the Solr servlet container: Tomcat or Jetty (the latter distributed with Solr itself).

For Jetty, the solution for this case is to add a line to etc/jetty.xml

  <Set name="headerBufferSize">65535</Set>

within the <Call name="addConnector"> section. Like so:

  <Call name="addConnector">
      <Arg>
          <New class="org.mortbay.jetty.bio.SocketConnector">
            <Set name="port"><SystemProperty name="jetty.port" default="8983"/></Set>
            <Set name="maxIdleTime">50000</Set>
            <Set name="lowResourceMaxIdleTime">1500</Set>
            <!-- Next line added to handle incoming GET requests up to 64k in length -->
            <Set name="headerBufferSize">65535</Set>
          </New>
      </Arg>
    </Call>

and then restarting Solr.

In Tomcat, it is possible to configure the maximum URL length using maxHttpHeaderSize. See: http://tomcat.apache.org/tomcat-5.5-doc/config/http.html

In Apache, use the LimitRequestLine directive. See: http://httpd.apache.org/docs/2.2/mod/core.html#limitrequestline

In IIS http://www.asp.net/Learn/whitepapers/aspnet4#0.2__Toc253429244