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https://issues.apache.org/jira/browse/SOLR-1730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13163852#comment-13163852
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Grant Ingersoll commented on SOLR-1730:
---------------------------------------
In the Solr example case, it appears the exception is getting swallowed
somewhere along the line. It isn't showing up in the logs, but for some
reason, it thinks it has already been logged.
> Solr fails to start if QueryElevationComponent config is missing
> ----------------------------------------------------------------
>
> Key: SOLR-1730
> URL: https://issues.apache.org/jira/browse/SOLR-1730
> Project: Solr
> Issue Type: Bug
> Components: SearchComponents - other
> Affects Versions: 1.4
> Reporter: Mark Miller
> Assignee: Grant Ingersoll
> Labels: newdev
> Fix For: 3.6, 4.0
>
>
> QueryElevationComponent tries to do preload some data if its config file does
> not exist:
> {code}
> 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();
> }
> }
> {code}
> 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:
> {code}
> [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)
> {code}
> 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.
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