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https://issues.apache.org/jira/browse/LUCENE-8833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16856751#comment-16856751
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Robert Muir commented on LUCENE-8833:
-------------------------------------

Can't the user do this with FileSwitchDirectory today? I am just mentioning 
that, because its what I had in mind when adding this option, its not really 
"all or nothing". 

That being said I'm not necessarily opposed to the change, but there is the 
general issue of whether or not we want to support users subclassing stuff like 
MMapDirectory versus using tools like FilterDirectory/FileSwitchDirectory to 
guide behavior like this.

> 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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