Installing midgard on Ubuntu via apt-get installs a huge number of packages, many of them solr-related (see #1613). Solr is not correctly configured, however. If you try to reindex a site, you get the following in catalina.log:
08.02.2010 10:04:05 org.apache.solr.core.SolrException log
SEVERE: org.apache.solr.core.SolrException: undefined field __TOPIC_GUID
at org.apache.solr.schema.IndexSchema.getDynamicFieldType(IndexSchema.java:888)
at org.apache.solr.schema.IndexSchema$SolrQueryAnalyzer.getAnalyzer(IndexSchema.java:282)
at org.apache.solr.schema.IndexSchema$SolrIndexAnalyzer.tokenStream(IndexSchema.java:260)
at org.apache.lucene.queryParser.QueryParser.getFieldQuery(QueryParser.java:429)
at org.apache.solr.search.SolrQueryParser.getFieldQuery(SolrQueryParser.java:78)
at org.apache.lucene.queryParser.QueryParser.Term(QueryParser.java:1092)
at org.apache.lucene.queryParser.QueryParser.Clause(QueryParser.java:979)
at org.apache.lucene.queryParser.QueryParser.Query(QueryParser.java:907)
at org.apache.lucene.queryParser.QueryParser.TopLevelQuery(QueryParser.java:896)
at org.apache.lucene.queryParser.QueryParser.parse(QueryParser.java:146)
at org.apache.solr.search.QueryParsing.parseQuery(QueryParsing.java:94)
at org.apache.solr.request.StandardRequestHandler.handleRequestBody(StandardRequestHandler.java:109)
at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:77)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:659)
at org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:191)
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:159)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:244)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAsPrivileged(Subject.java:537)
at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:276)
at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:218)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.ApplicationFilterChain.access$0(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:171)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:167)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:874)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:636)
08.02.2010 10:04:05 org.apache.solr.core.SolrCore execute
INFO: /select fl=*,score&q=__TOPIC_GUID:d350ba62e27f11dd92a8d13bcb5963e863e8&fq=__INDEX_NAME:"localhost_"&rows=1000 0 47
The problem is that the needed schema.xml file is missing. In fact, it is missing entirely from the Ragnaroek branch, you have to manually copy it to your server from SVN trunk/external-tools/indexer-backends/solr/schema.xml
