mikemccand commented on code in PR #13206:
URL: https://github.com/apache/lucene/pull/13206#discussion_r1539235911
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lucene/core/src/java/org/apache/lucene/store/NRTCachingDirectory.java:
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@@ -73,6 +73,7 @@ public class NRTCachingDirectory extends FilterDirectory
implements Accountable
new SingleInstanceLockFactory(),
ByteBuffersDataOutput::new,
(fileName, content) -> {
+ if (!isCachedFile(fileName)) return null;
Review Comment:
Ahh thank you for the clarification @jpountz. I am playing catchup on this
code ;) I think I understand it now.
So, this is the `onClose` lambda that is called (when the `IndexOutput` is
closed), where we normally increase the `cacheSize` (we do not count the bytes
as they are being appended, live, to the file, but rather only when the
`IndexOutput` is closed).
And we are (newly, with this PR) checking whether it has already been
deleted before it was closed and avoiding adding to `cacheSize` in this case.
Indeed Lucene should never do this, except maybe in exceptional situations (and
even then, hopefully not: Lucene should first close any still-open
`IndexOutput`s on exception before delete is tried, I think). +1 to be
defensive anyways.
Also this is different from the "delete while file is still open for
reading" case...
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