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From "Chuck Williams (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1052) Add an "termInfosIndexDivisor" to IndexReader
Date Tue, 20 Nov 2007 20:46:43 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12544055
] 

Chuck Williams commented on LUCENE-1052:
----------------------------------------

I agree a general configuration system would be much better.  Doug. we use a similar method
to what you described in our application.

TermInfosConfigurer is slightly different though since the desired config is a method that
implements a formula, rather than just a value.  This could still be done more generally by
allowing methods as well as properties or setters on a higher level configuration object.

I didn't want to take on the broader issue just for this feature.

Michael I agree with both of your points.

I'd be happy to clean up this patch if you guys provide some guidance for what would make
it acceptable to commit.


> Add an "termInfosIndexDivisor" to IndexReader
> ---------------------------------------------
>
>                 Key: LUCENE-1052
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1052
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>    Affects Versions: 2.2
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 2.3
>
>         Attachments: LUCENE-1052.patch, termInfosConfigurer.patch
>
>
> The termIndexInterval, set during indexing time, let's you tradeoff
> how much RAM is used by a reader to load the indexed terms vs cost of
> seeking to the specific term you want to load.
> But the downside is you must set it at indexing time.
> This issue adds an indexDivisor to TermInfosReader so that on opening
> a reader you could further sub-sample the the termIndexInterval to use
> less RAM.  EG a setting of 2 means every 2 * termIndexInterval is
> loaded into RAM.
> This is particularly useful if your index has a great many terms (eg
> you accidentally indexed binary terms).
> Spinoff from this thread:
>   http://www.gossamer-threads.com/lists/lucene/java-dev/54371

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