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https://issues.apache.org/jira/browse/LUCENE-1052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12543854
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Michael McCandless commented on LUCENE-1052:
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Thanks Chuck for such a wonderfully thorough patch & unit tests, and
for adding the methods to ParallelReader, too (I had missed it the
first time around)! The patch looks good.
Should we use an abstract base class instead of interface for
TermInfosConfigurer so we can add additional methods in the future
without breaking back compatibility?
Also I think we should mark this API as advanced, somewhat
experimental and subject to change?
> 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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