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https://issues.apache.org/jira/browse/SOLR-14758?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uwe Schindler resolved SOLR-14758.
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Resolution: Fixed
Fixed the test bug, sorry for false alarm. Distibuted sorting and partial
results are working correctly.
> NPE in QueryComponent.mergeIds when using timeAllowed and sorting
> -----------------------------------------------------------------
>
> Key: SOLR-14758
> URL: https://issues.apache.org/jira/browse/SOLR-14758
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 7.7.3, 8.6.3, main (9.0), 8.8.1, 8.8.2
> Reporter: Bram Van Dam
> Assignee: Uwe Schindler
> Priority: Major
> Fix For: main (9.0), 8.10
>
> Attachments: SOLR-14758.patch, SOLR-14758.patch
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> Only tested on 7.7.3 and master, but the offending code hasn't been changed
> for a while, so this presumably affects other versions as well.
> Steps to reproduce:
> # SolrCloud
> # Create a query which is complex enough to take a while
> # Add a sort clause to the query (e.g. &sort=creationTimestamp asc)
> # Add a short value timeAllowed (10ms in my test)
> Result: NPE in QueryComponent.mergeIds:935
> It may take a couple of attempts to hit the error.
> Offending code:
> {code:java}
> NamedList sortFieldValues =
> (NamedList)(srsp.getSolrResponse().getResponse().get("sort_values"));
> if (sortFieldValues.size()==0 && // we bypass merging this response
> only if it's partial itself
> thisResponseIsPartial) { // but not the previous
> one!!
> continue; //fsv timeout yields empty sort_vlaues
> }
> {code}
> sortFieldValues can apparently be null in some cases, depending on when the
> query hits the timeAllowed. Adding an extra null check fixes the issue.
> {code:java}
> NamedList sortFieldValues =
> (NamedList)(srsp.getSolrResponse().getResponse().get("sort_values"));
> if ((null == sortFieldValues || sortFieldValues.size()==0) && // we
> bypass merging this response only if it's partial itself
> thisResponseIsPartial) { // but not the previous
> one!!
> continue; //fsv timeout yields empty sort_vlaues
> }
> {code}
> I'll attach a patch.
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