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https://issues.apache.org/jira/browse/SOLR-5478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13827998#comment-13827998
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Manuel Lenormand commented on SOLR-5478:
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Following this mailing list thread -
http://lucene.472066.n3.nabble.com/distributed-search-is-significantly-slower-than-direct-search-td4098191.html#a4101713
I upload a patch for testing performance.
The idea is during the top document search (first stage) we read the uniquekey
from docValues, and doc fields are not loaded (not normally nor lazily). During
the second stage we do not access the stored fields in case the user requested
uniquekey only
> Speed-up distributed search with high rows param or deep paging by
> transforming docId's to uniqueKey via memory docValues
> -------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-5478
> URL: https://issues.apache.org/jira/browse/SOLR-5478
> Project: Solr
> Issue Type: Improvement
> Components: Response Writers
> Affects Versions: 4.5
> Reporter: Manuel Lenormand
> Fix For: 4.6
>
>
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