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https://issues.apache.org/jira/browse/SOLR-8851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15209950#comment-15209950
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Marius Grama commented on SOLR-8851:
------------------------------------
The only place I see that ExitingReaderException is being thrown is in the
{{ExitableDirectoryReader.ExitableTermsEnum}} class.
I could reproduce the {{ExitableDirectoryReader.ExitingReaderException}} in the
class {{SearchHandler}} by using the following query :
http://localhost:8983/solr/techproducts/terms?terms.fl=name&timeAllowed=1
In this case, the call {{rb.rsp.getValues().get("response")}} returns {{null}}
reason why the variable {{r}} of type {{SolrDocumentList}} will be explicitly
instantiated and the issue reported by you doesn't occur.
On the other hand, I see in the {{QueryComponent}} class that an object
instance of type {{ResultContext}} is used for "response"
{code}
ResultContext ctx = new ResultContext();
ctx.docs = rb.getResults().docList;
ctx.query = rb.getQuery();
rsp.add("response", ctx);
{code}
, so the code line SearchHandler.java 293 is not quite correct :
{code}
SolrDocumentList r = (SolrDocumentList) rb.rsp.getValues().get("response");
{code}
Could you give me a concrete solr query for reproducing the issue?
> 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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