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https://issues.apache.org/jira/browse/SOLR-1730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13164575#comment-13164575
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Grant Ingersoll commented on SOLR-1730:
---------------------------------------
The NPE is due to the fact that we initListeners() then we call getSearcher()
which creates the new searcher and registers a Future/Callable on those
listeners passing in "this" (i.e. the partially constructed core that is about
to fail), then later, when the core fails, there is still an
thread/future/callable waiting to fire off the newSearcher event which it does
as soon as the CountDownLatch is released. Little does it know, the core is
actually dead. I don't particularly think we need to fix this other than to
perhaps document it here, as I think, since things are undefined at this point
b/c the core is dead, that we shouldn't care too much about these side
consequences.
> 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
>
> Attachments: SOLR-1730.patch
>
>
> 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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