[jira] [Commented] (SOLR-2583) Make external scoring more efficient (ExternalFileField, FileFloatSource)

["Yonik Seeley (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-2583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13046564#comment-13046564 ] 

Yonik Seeley commented on SOLR-2583:
------------------------------------

Yeah, this will help for sparse fields, but hurt quite a bit for non-sparse ones.
Seems like we should make it an option (sparse=true/false on the fieldType definition)?

> Make external scoring more efficient (ExternalFileField, FileFloatSource)
> -------------------------------------------------------------------------
>
>                 Key: SOLR-2583
>                 URL: https://issues.apache.org/jira/browse/SOLR-2583
>             Project: Solr
>          Issue Type: Improvement
>          Components: search
>            Reporter: Martin Grotzke
>            Priority: Minor
>         Attachments: FileFloatSource.java.patch
>
>
> External scoring eats much memory, depending on the number of documents in the index. The ExternalFileField (used for external scoring) uses FileFloatSource, where one FileFloatSource is created per external scoring file. FileFloatSource creates a float array with the size of the number of docs (this is also done if the file to load is not found). If there are much less entries in the scoring file than there are number of docs in total the big float array wastes much memory.
> This could be optimized by using a map of doc -> score, so that the map contains as many entries as there are scoring entries in the external file, but not more.

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