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https://issues.apache.org/jira/browse/SOLR-6156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14063390#comment-14063390
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Modassar Ather commented on SOLR-6156:
--------------------------------------
While debugging found that the create() method under SearchGroupsFieldCommand
class return an empty list of collectors if topNGroups < 0 and if
includeGroupCount is false.
And if the collectors list is empty CommandHandler class invokes
searchWithTimeLimiter(query, filter, null);. null is passed as collectors.
With the null collector passed an instance of TimeLimitingCollector is created
in searchWithTimeLimiter(...) method of CommandHandler class if
queryCommand.getTimeAllowed() > 0.
Code snippet from CommandHandler. Here in the code below the collector passed
to TimeLimitingCollector is null.
if (queryCommand.getTimeAllowed() > 0 ) {
collector = new TimeLimitingCollector(collector,
TimeLimitingCollector.getGlobalCounter(), queryCommand.getTimeAllowed());
}
The NullPointerException occurrs when the TimeLimitingCollector instance
created with null collector invokes setNextReader(...)
Not sure if topNGroups should be greater than 0 or includeGroupCount should be
true when using timeAllowed or it is an issue. Kindly provide inputs.
Also let me know if the collectors list is null and timeAllowed>0 which
collector can be used to create the instance of TimeLimitingCollector.
Thanks,
Modassar
> Exception while using group with timeAllowed on SolrCloud.
> ----------------------------------------------------------
>
> Key: SOLR-6156
> URL: https://issues.apache.org/jira/browse/SOLR-6156
> Project: Solr
> Issue Type: Bug
> Reporter: Modassar Ather
>
> Following exception is thrown when using grouping with timeAllowed. Solr
> version used is 4.8.0.
> SEVERE:
> null:org.apache.solr.client.solrj.impl.HttpSolrServer$RemoteSolrException:
> java.lang.NullPointerException
> at
> org.apache.lucene.search.TimeLimitingCollector.setNextReader(TimeLimitingCollector.java:158)
> at
> org.apache.lucene.search.MultiCollector.setNextReader(MultiCollector.java:113)
> at
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:612)
> at
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:297)
> at
> org.apache.solr.search.grouping.CommandHandler.searchWithTimeLimiter(CommandHandler.java:219)
> at
> org.apache.solr.search.grouping.CommandHandler.execute(CommandHandler.java:156)
> at
> org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:338)
> at
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:218)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:135)
> at org.apache.solr.core.SolrCore.execute(SolrCore.java:1952)
> at
> org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:774)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:418)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:207)
>
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