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https://issues.apache.org/jira/browse/LUCENE-7826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16009585#comment-16009585
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David Smiley commented on LUCENE-7826:
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I disagree on an "unload" as the issue title suggests but I do think the FST
should be lazily loaded to be more NRT friendly, and to use less memory when
some fields aren't always accessed. I recently did this in fact and could
share the patch. It'd be a separate issue I think.
> Support to unload FST's .tip into memory,make load or unload configuable!.
> --------------------------------------------------------------------------
>
> Key: LUCENE-7826
> URL: https://issues.apache.org/jira/browse/LUCENE-7826
> Project: Lucene - Core
> Issue Type: New Feature
> Components: core/FSTs, core/store
> Reporter: Xibao
> Priority: Minor
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> in real case,we use lucene index many documents. But some machine have not
> much memory.,once documents reach up to tens of billion,lucene can not start
> because of no enough memory. Most of the memry cost is FST;s .tip content.
> So I want to pull my change on lucene core to make load FST's .tip into
> memory become configurable!
> What do you think?
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