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https://issues.apache.org/jira/browse/SOLR-8851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15215801#comment-15215801
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Pascal Chollet commented on SOLR-8851:
--------------------------------------
It can be reproduced with a wildcard query matching to really many terms. In
our case the query matches to something like 3 million terms -
{{QueryComponent.process()}} finishes without timeout, but then the timeout
happens in {{FacetComponent.process()}}
This is the stacktrace when the exception is being thrown:
{code}
at
org.apache.lucene.index.ExitableDirectoryReader$ExitingReaderException.<init>(ExitableDirectoryReader.java:47)
at
org.apache.lucene.index.ExitableDirectoryReader$ExitableTermsEnum.checkAndThrow(ExitableDirectoryReader.java:166)
at
org.apache.lucene.index.ExitableDirectoryReader$ExitableTermsEnum.next(ExitableDirectoryReader.java:178)
at
org.apache.lucene.search.MultiTermQueryConstantScoreWrapper$1.rewrite(MultiTermQueryConstantScoreWrapper.java:181)
at
org.apache.lucene.search.MultiTermQueryConstantScoreWrapper$1.scorer(MultiTermQueryConstantScoreWrapper.java:213)
at org.apache.lucene.search.BoostQuery$1.scorer(BoostQuery.java:168)
at
org.apache.lucene.search.DisjunctionMaxQuery$DisjunctionMaxWeight.scorer(DisjunctionMaxQuery.java:177)
at
org.apache.lucene.search.DisjunctionMaxQuery$DisjunctionMaxWeight.scorer(DisjunctionMaxQuery.java:177)
at
org.apache.lucene.queries.function.BoostedQuery$BoostedWeight.scorer(BoostedQuery.java:99)
at
org.apache.lucene.search.DisjunctionMaxQuery$DisjunctionMaxWeight.scorer(DisjunctionMaxQuery.java:177)
at
org.apache.solr.search.FilterImpl$FilterSet.iterator(SolrIndexSearcher.java:2523)
at
org.apache.solr.search.SolrIndexSearcher.getDocSet(SolrIndexSearcher.java:1030)
at org.apache.solr.request.SimpleFacets.computeDocSet(SimpleFacets.java:266)
at org.apache.solr.request.SimpleFacets.parseParams(SimpleFacets.java:225)
at
org.apache.solr.request.SimpleFacets.getFacetFieldCounts(SimpleFacets.java:610)
at
org.apache.solr.handler.component.FacetComponent.getFacetCounts(FacetComponent.java:295)
at
org.apache.solr.handler.component.FacetComponent.process(FacetComponent.java:257)
at
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:281)
at
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:156)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:2073)
at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:658)
at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:457)
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:223)
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:181)
{code}
> ClassCastException in SearchHandler
> -----------------------------------
>
> Key: SOLR-8851
> URL: https://issues.apache.org/jira/browse/SOLR-8851
> Project: Solr
> Issue Type: Bug
> Affects Versions: 5.4.1
> Reporter: Pascal Chollet
>
> When there is a query timeout in non-distrub mode, {{SearchHandler}} is
> throwing a {{ClassCastException}}:
> {code}java.lang.ClassCastException: org.apache.solr.response.ResultContext
> cannot be cast to org.apache.solr.common.SolrDocumentList
> at
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:293)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:156)
> ...{code}
> The problem can be reproduced if any component running after
> {{QueryComponent}} times out - in our case it is {{FacetComponent}} which
> throws a {{ExitingReaderException}}.
> {{SearchHandler:293}} expects a {{SolrDocumentList}} in {{rsp.response}}, but
> {{QueryComponent}} did add a {{ResultContext}} instead.
> It looks like this is not a problem, if the {{QueryComponent}} itself is
> timing out, as rsp.response is null in that case. It's only a problem if a
> component after {{QueryComponent}} is timing out.
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