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https://issues.apache.org/jira/browse/SOLR-16289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17691498#comment-17691498
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Alessandro Benedetti commented on SOLR-16289:
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Hi, this is not a bug, currently SolrCloud is not supported in Interleaving.
Things start to get complicated when you add shards and aggregation of results
with the interleaving necessity of mixing up results from different ranked
lists.
Happy to evaluate and brainstorm on a solution for that!
Didn't have time to spend on that yet,
> [interleaving] transformer does not work in SolrCloud
> -----------------------------------------------------
>
> Key: SOLR-16289
> URL: https://issues.apache.org/jira/browse/SOLR-16289
> Project: Solr
> Issue Type: Improvement
> Components: contrib - LTR
> Affects Versions: 9.0
> Reporter: Naoto Minami
> Priority: Major
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> In SolrCloud, two-stage shard requests are processed. The first stage is to
> execute the query return unique keys and scores of documents. Then, in the
> second stage, collect fields’ values of merged top documents.
> LTRInterleavingTransformerFactory should be run in the first stage
> (ResponseBuilder.STAGE_EXECUTE_QUERY), because the
> LTRInterleavingScoringQuery knows which model is used in scoring. However,
> it’s run in second stage(ResponseBuilder.STAGE_GET_FIELDS) and
> LTRInterleavingRescorer#rescore is skipped in second stage.
> LTRInterleavingTransformerFactory cannot handle this case, so thrown
> NullPointerException when fl=[interleaving] is specified in SolrCloud. There
> is a same problem in LTRFeatureLoggerTransformerFactory. But, if interleaving
> is not used, LTRFeatureLoggerTransformerFactory falls back when feature
> vector cache is not hit (i.e. in second stage).
> I will fix the NullPointerException problem, but the underlying solution
> should be discussed. One of the solution of this problem is disable two-stage
> request by distrib.singlePass=true parameter.
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