mikemccand commented on code in PR #13206:
URL: https://github.com/apache/lucene/pull/13206#discussion_r1539244396


##########
lucene/core/src/java/org/apache/lucene/store/NRTCachingDirectory.java:
##########
@@ -118,7 +119,9 @@ public synchronized void deleteFile(String name) throws 
IOException {
       System.out.println("nrtdir.deleteFile name=" + name);
     }
     if (cacheDirectory.fileExists(name)) {
+      long size = cacheDirectory.fileLength(name);
       cacheDirectory.deleteFile(name);
+      cacheSize.addAndGet(-size);

Review Comment:
   Could we hold onto the returned (get'd) value and assert that it never drops 
below zero?



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