[jira] [Commented] (SOLR-1726) Deep Paging and Large Results Improvements

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[jira] [Commented] (SOLR-1726) Deep Paging and Large Results Improvements

Sebastian Nagel (Jira)

    [ https://issues.apache.org/jira/browse/SOLR-1726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13198177#comment-13198177 ]

Robert Muir commented on SOLR-1726:

on a quick test, I'm getting a maxScore=NaN

From the lucene point of view,

for the first page, because scoredoc = null, this is set (in fact ordinary collector is used)
for subsequent pages, searchAfter never sets this in the TopDocs, it would just be telling you something you already know! (and cost extra cpu per collect)


> Deep Paging and Large Results Improvements
> ------------------------------------------
>                 Key: SOLR-1726
>                 URL: https://issues.apache.org/jira/browse/SOLR-1726
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Grant Ingersoll
>            Assignee: Grant Ingersoll
>            Priority: Minor
>             Fix For: 4.0
>         Attachments: CommonParams.java, QParser.java, QueryComponent.java, ResponseBuilder.java, SOLR-1726.patch, SOLR-1726.patch, SolrIndexSearcher.java, TopDocsCollector.java, TopScoreDocCollector.java
> There are possibly ways to improve collections of "deep paging" by passing Solr/Lucene more information about the last page of results seen, thereby saving priority queue operations.   See LUCENE-2215.
> There may also be better options for retrieving large numbers of rows at a time that are worth exploring.  LUCENE-2127.

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