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https://issues.apache.org/jira/browse/SOLR-4164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15178532#comment-15178532
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Webster Homer commented on SOLR-4164:
-------------------------------------
Found that if you set group.limit to -1 it will give the same failure. We had
code that did this with the intent of getting all the documents in the roll up.
We limit it to 500 so setting group.limit=500 was a decent work around. Still
this worked fine with normal solr, only solrcloud had a problem
> Result Grouping fails if no hits
> --------------------------------
>
> Key: SOLR-4164
> URL: https://issues.apache.org/jira/browse/SOLR-4164
> Project: Solr
> Issue Type: Bug
> Components: SearchComponents - other, SolrCloud
> Affects Versions: 4.0
> Reporter: Lance Norskog
>
> In SolrCloud, found a result grouping bug in the 4.0 release.
> A distributed result grouping request under SolrCloud got this result:
> {noformat}
> Dec 10, 2012 10:32:07 PM org.apache.solr.common.SolrException log
> SEVERE: null:java.lang.IllegalArgumentException: numHits must be > 0; please
> use TotalHitCountCollector if you just need the total hit count
> at
> org.apache.lucene.search.TopFieldCollector.create(TopFieldCollector.java:1120)
> at
> org.apache.lucene.search.TopFieldCollector.create(TopFieldCollector.java:1069)
> at
> org.apache.lucene.search.grouping.AbstractSecondPassGroupingCollector.<init>(AbstractSecondPassGroupingCollector.java:75)
> at
> org.apache.lucene.search.grouping.term.TermSecondPassGroupingCollector.<init>(TermSecondPassGroupingCollector.java:49)
> at
> org.apache.solr.search.grouping.distributed.command.TopGroupsFieldCommand.create(TopGroupsFieldCommand.java:128)
> at
> org.apache.solr.search.grouping.CommandHandler.execute(CommandHandler.java:132)
> at
> org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:339)
> at
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:206)
> {noformat}
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