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Date: Mon, 29 Mar 2010 14:05:27 +0000 (UTC)
From: "Michael McCandless (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-2356) Enable setting the terms index
 divisor used by IndexWriter whenever it opens internal readers
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    [ https://issues.apache.org/jira/browse/LUCENE-2356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12850916#action_12850916 ] 

Michael McCandless commented on LUCENE-2356:
--------------------------------------------

The above comment was on the wrong issue :)

We should only do this issue if the ongoing ideas about refactoring IW/IR don't make controlling the terms index divisor possible, for readers opened by IW.

> Enable setting the terms index divisor used by IndexWriter whenever it opens internal readers
> ---------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-2356
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2356
>             Project: Lucene - Java
>          Issue Type: Bug
>            Reporter: Michael McCandless
>             Fix For: 3.1
>
>
> Opening a place holder issue... if all the refactoring being discussed don't make this possible, then we should add a setting to IWC to do so.
> Apps with very large numbers of unique terms must set the terms index divisor to control RAM usage.
> (NOTE: flex's RAM terms dict index RAM usage is more efficient, so this will help such apps).
> But, when IW resolves deletes internally it always uses default 1 terms index divisor, and the app cannot change that.  Though one workaround is to call getReader(termInfosIndexDivisor) which will pool the reader with the right divisor.

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