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From "Yonik Seeley (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-1726) Deep Paging and Large Results Improvements
Date Wed, 01 Feb 2012 21:16:58 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13198158#comment-13198158
] 

Yonik Seeley commented on SOLR-1726:
------------------------------------

Some other issues:
 - the optimization doesn't work if the docset is also requested (i.e. if facet=true) since
it's only added in one place.
 - on a quick test, I'm getting a maxScore=NaN
{code}
<result name="response" numFound="29" start="0" maxScore="NaN">
{code}
Not sure if that's expected, but it's likely to mess up at least some clients
 - when using pageDoc, the results get incorrectly cached as a non-paged query (and hence
other requests that use the same query will be incorrect)
 - when using pageDoc, any previous cached queries will be incorrectly used and hence incorrect
results will be returned
 - it was pretty easy to cause a NPE (but I haven't had time to look into the causes yet):
http://localhost:8983/solr/select?q=*:*&pageDoc=20&pageScore=1.0&fl=[docid],score
{code}
java.lang.NullPointerException
	at org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:566)
	at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:203)
{code}
 - if you look at the test for this, the query only ever matches a single doc!  Given that
the test actually passes while trying to use paging actually means that paging isn't working
(since the second page should obviously yield no results).

I've disabled this for now since it's not ready for prime-time and since it messes with non-deep-paged
results.
                
> 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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