Mark Robert Miller created SOLR-15562:
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Summary: Offer an MMapDirectoryFactory that writes with
DirectIODirectory rather than FSDirectory.
Key: SOLR-15562
URL: https://issues.apache.org/jira/browse/SOLR-15562
Project: Solr
Issue Type: Sub-task
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Mark Robert Miller
DirectIODirectory uses a Java 10 feature to enable directio for merging so as
to prevent merges from flooding the IO cache and replacing high value data with
low value data.
MMapDirectory is the top read side Directory, you should allow using it with a
better write side Directory.
Additionally, it might even be worth exploring how directio behaves in other
read side spots.
Word on the street is that it can reduce kernel memory management resources and
improve the poor unmap performance and that with a random read heavy load on
SSDs, it *can* be a win, especially in combination with other available
application caches.
Not wildly optimistic on the general read side, but perhaps worth taking a peak
at.
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