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https://issues.apache.org/jira/browse/LUCENE-7834?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16031955#comment-16031955
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David Smiley commented on LUCENE-7834:
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I can move this to a boolean option on BlockTreeTermsReader. When the option is
disabled (thus eager), I can also have the constructor eagerly close the
IndexInput for the index as it won't be needed (one less file handle).
Alternatively, I could add a method to eager load them (and close that
IndexInput) that can be called immediately after construction by
Lucene50PostingsFormat. Any opinion?
> BlockTree's terms index should be loaded into memory lazily
> -----------------------------------------------------------
>
> Key: LUCENE-7834
> URL: https://issues.apache.org/jira/browse/LUCENE-7834
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/codecs
> Reporter: David Smiley
> Assignee: David Smiley
> Attachments: LUCENE_7834_BlockTreeLazyFST.patch
>
>
> I propose that BlockTree delay loading the FST prefix terms index into memory
> until {{terms(String)}} is first called. This seems like how it should work
> since if someone wants to eager load then they can use {{IndexReaderWarmer}}.
> By making the FST lazy load, we can be more NRT friendly (if some fields are
> rarely used), and also save memory (if some fields are rarely used).
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