mikemccand commented on issue #13551:
URL: https://github.com/apache/lucene/issues/13551#issuecomment-2444797398
> ...but later realized that this would not work for compound files that
have vector data in them eg `.cfs`?
Tracing `MMapDirectory.openInput` in `main`, it does this:
```
return PROVIDER.openInput(
path,
context,
chunkSizePower,
preload.test(name, context),
groupingFunction.apply(name),
attachment);
```
So it looks like it applies the `preload` predicate to the `.cfs` named
file... and then passes the resulting `boolean` to the JDK-version-specific
impl. Opening further slices within this `IndexInput` (what CFS filels do) no
longer do any preloading, since the whole `.cfs` file was either preloaded or
not.
@gautamworah96 -- maybe open a spinoff issue exploring whether we could
offer preloading of just slices within a CFS file?
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