stefanvodita commented on code in PR #13017:
URL: https://github.com/apache/lucene/pull/13017#discussion_r1507272812


##########
lucene/core/src/java/org/apache/lucene/index/ReadersAndUpdates.java:
##########
@@ -782,13 +784,17 @@ synchronized MergePolicy.MergeReader 
getReaderForMerge(IOContext context) throws
     }
 
     SegmentReader reader = getReader(context);
-    if (pendingDeletes.needsRefresh(reader)) {
+    if (pendingDeletes.needsRefresh(reader)
+        || reader.getSegmentInfo().getDelGen() != 
pendingDeletes.info.getDelGen()) {

Review Comment:
   Thank you for the thorough explanation, it's really useful!



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