Hi,
There is a workaround available called DirectIODirectory. You can
subclass it and override useDirectIO() method to return true only for
fdt files. It wraps another FSDirectory (e.g. MMapDirectory) and
delegates everything back to it, but for those where useDirectIO()
returns true it implements its own IndexInput:
https://github.com/apache/lucene/blob/90f8bac9f75df88fed387d5b9f2b0ee387604387/lucene/misc/src/java/org/apache/lucene/misc/store/DirectIODirectory.java#L160-L164
The default uses DirectIO only for merges to not pollute page cache
during merging index segments.
Uwe
Am 21.10.2023 um 01:54 schrieb Justin Borromeo:
Is there any way to keep field data files out of the operating system's
page cache? We only use fdt for highlighting and don't need to keep it warm
in memory. From what I understand, the operating system is in control of
what files get loaded into the page cache. Does Lucene have any mechanisms
to explicitly prevent them from being cached? Is it even possible with
Java?
Thanks,
Justin Borromeo
--
Uwe Schindler
Achterdiek 19, D-28357 Bremen
https://www.thetaphi.de
eMail: u...@thetaphi.de
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