mikemccand commented on code in PR #13206:
URL: https://github.com/apache/lucene/pull/13206#discussion_r1539130332


##########
lucene/core/src/java/org/apache/lucene/store/NRTCachingDirectory.java:
##########
@@ -73,6 +73,7 @@ public class NRTCachingDirectory extends FilterDirectory 
implements Accountable
           new SingleInstanceLockFactory(),
           ByteBuffersDataOutput::new,
           (fileName, content) -> {
+            if (!isCachedFile(fileName)) return null;

Review Comment:
   Could we split this onto three lines and add `{` ... `}` around the body?
   
   And replace the `!` with `== false` to reduce chance of future accidental 
refactoring bugs?



##########
lucene/core/src/java/org/apache/lucene/store/NRTCachingDirectory.java:
##########
@@ -73,6 +73,7 @@ public class NRTCachingDirectory extends FilterDirectory 
implements Accountable
           new SingleInstanceLockFactory(),
           ByteBuffersDataOutput::new,
           (fileName, content) -> {
+            if (!isCachedFile(fileName)) return null;

Review Comment:
   Hmm, was this a separate bug?  We were including this file's size in 
`cacheSize` even if it is not cached?
   
   Though, why would this lambda be called on a `fileName` that is not going to 
be cached?  I though the `if` in `NRTCachingDirectory.createOutput` would only 
ask the `cacheDirectory` to create the output if the `fileName` was to be 
cached?



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