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https://issues.apache.org/jira/browse/LUCENE-7834?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley updated LUCENE-7834:
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Attachment: LUCENE_7834_BlockTreeLazyFST.patch
Attached patch. indexIn is kept open instead of closed eagerly since an FST
may need to be loaded at any time, and it's problematic to re-open it.
Note I added this TODO about "indexIn" in FieldReader's constructor:
{{//TODO DWS: I don't see how it can be null. Lots of null checks on
"index" in BlockTree could be removed.}}
> 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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