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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-2335) optimization: when sorting by field, if index has one segment and field values are not needed, do not load String[] into field cache
Date Thu, 09 May 2013 23:06:11 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2335?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uwe Schindler updated LUCENE-2335:
----------------------------------

    Fix Version/s:     (was: 4.3)
                   4.4
    
> optimization: when sorting by field, if index has one segment and field values are not
needed, do not load String[] into field cache
> ------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-2335
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2335
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/search
>            Reporter: Michael McCandless
>            Priority: Minor
>              Labels: gsoc2013
>             Fix For: 4.4
>
>
> Spinoff from java-dev thread "Sorting with little memory: A suggestion", started by Toke
Eskildsen.
> When sorting by SortField.STRING we currently ask FieldCache for a StringIndex on that
field.
> This can consumes tons of RAM, when the values are mostly unique (eg a title field),
as it populates both int[] ords as well as String[] values.
> But, if the index is only one segment, and the search sets fillFields=false, we don't
need the String[] values, just the int[] ords.  If the app needs to show the fields it can
pull them (for the 1 page) from stored fields.
> This can be a potent optimization -- alot of RAM saved -- for optimized indexes.
> When fixing this we must take care to share the int[] ords if some queries do fillFields=true
and some =false... ie, FieldCache will be called twice and it should share the int[] ords
across those invocations.

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