[SOLR-1730] Solr fails to start if QueryElevationComponent config is missing

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.4
• Fix Version/s: 3.6, 4.0-ALPHA
• Component/s: SearchComponents - other
• Labels: newdev
• Assignee: Grant Ingersoll
• Reporter: Mark Miller
• Created: 21/Jan/10 19:58
• Updated: 10/May/13 10:40
• Resolved: 08/Dec/11 12:09

Description

QueryElevationComponent tries to do preload some data if its config file does not exist:

        if (!exists){
          // preload the first data
          RefCounted<SolrIndexSearcher> searchHolder = null;
          try {
            searchHolder = core.getNewestSearcher(false);
            IndexReader reader = searchHolder.get().getReader();
            getElevationMap( reader, core );
          } finally {
            if (searchHolder != null) searchHolder.decref();
          }
        }

This does not work though, as asking for the newest searcher causes a request to be submitted to Solr before its ready to handle it:

     [java] SEVERE: java.lang.NullPointerException
     [java] 	at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:173)
     [java] 	at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:131)
     [java] 	at org.apache.solr.core.SolrCore.execute(SolrCore.java:1317)
     [java] 	at org.apache.solr.core.QuerySenderListener.newSearcher(QuerySenderListener.java:52)
     [java] 	at org.apache.solr.core.SolrCore$3.call(SolrCore.java:1147)
     [java] 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
     [java] 	at java.util.concurrent.FutureTask.run(FutureTask.java:138)

The SearchHandler has not yet been core informed (as the QueryElevationComponent causes this as its getting core informed right before the SearchHandler) and so its components arraylist is still null.

Issue Links

• relates to: SOLR-2580 Create Components to Support Using Business Rules in Solr