[GitHub] [solr] Stefan4solr commented on pull request #151: SOLR-15437: ReRanking/LTR does not work in combination with custom sort and SolrCloud

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Stefan4solr commented on PR #151:
URL: https://github.com/apache/solr/pull/151#issuecomment-1274516075

   We're also affected by this bug and first of all we're wondering: Is anyone still working on these PRs?
   
   Furthermore while the Solution proposed in the PRs 151/171 also covers many corner cases and e.g. uneven distributions of re-ranked docs across the shards, we were thinking about deploying a temporary, simpler fix for our local installation, perhaps a variant of what @dsmiley mentioned in his last comment: To adjust the scores of all re-ranked documents locally in the shards to make them larger than the largest original score of the documents before re-ranking. There is still be the possibility that the original scores differ per shard, but since we also accept that for normal ranking (except for distributed IDF via global statsCache), we figured we could ignore that. We would also accept that the scores of all re-ranked docs are always better than the highest non-reranked score, and we'd set reRankDocs to be our intended total number divided by the actual numbers of shards we're using. However (not being a Solr expert), is there something obvious I'm missing here?


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