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https://issues.apache.org/jira/browse/LUCENE-8833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16858441#comment-16858441
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Simon Willnauer commented on LUCENE-8833:
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I do like the idea of #warm but the footprint is much bigger since it's a
public API. I mean for my specific usecase I'd subclass mmap anyway and it
would make it easier that way. FileSwitchDirectory is quite heavy and isn't
really build for what I wanna do. I basically would need a IndexInput factory
that I can plug into a directory that can alternate between NIOFS and mmap etc.
and conditionally preload the mmap. Either way I can work with both I just
think this change is the minimum viable change. lemme know if you are ok moving
forward.
> Allow subclasses of MMapDirecory to preload individual IndexInputs
> ------------------------------------------------------------------
>
> Key: LUCENE-8833
> URL: https://issues.apache.org/jira/browse/LUCENE-8833
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Simon Willnauer
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> I think it's useful for subclasses to select the preload flag on a per index
> input basis rather than all or nothing. Here is a patch that has an
> overloaded protected openInput method.
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