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https://issues.apache.org/jira/browse/LUCENE-8833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16858126#comment-16858126
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Robert Muir commented on LUCENE-8833:
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Another idea is to expose the option completely differently to make it easier
for the search use-case, maybe such as {{IndexInput.warm()}}. MMapDirectory
could call {{load()}} on relevant bytebuffers, NIOFSDirectory could do
whatever, ByteBuffersDirectory could do nothing. Someone could use this in
their IndexReaderWarmer to efficiently warm their index and reduce user latency.
> 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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