Michael McCandless created LUCENE-7375:
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Summary: Can we allow FSDirectory subclasses to customize whether
the ctor does a mkdir?
Key: LUCENE-7375
URL: https://issues.apache.org/jira/browse/LUCENE-7375
Project: Lucene - Core
Issue Type: Improvement
Reporter: Michael McCandless
Today, just instantiating an {{FSDirectory}} always brings the directory into
existence, even if you will do no writes ({{createOutput}}).
We have gone back and forth on this, over the ages. E.g. see LUCENE-16 (only 2
digits there!!), LUCENE-773 (only 3 digits there!!), LUCENE-1464. At one point
we created the directory lazily, on the first write ({{createOutput}}) attempt,
but now we always create it when you instantiate {{FSDirectory}}.
This causes some hassle for consumers, e.g. in
https://github.com/elastic/elasticsearch/pull/19338 ES is forking
{{SimpleFSDirectory}} in order to have a read-only directory impl.
Maybe we can do the {{Files.createDirectories}} in protected method that a
subclass could override?
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