mikemccand commented on a change in pull request #688: LUCENE-8813: Ensure we 
never apply deletes from a closed DWPTDeleteQueue
URL: https://github.com/apache/lucene-solr/pull/688#discussion_r288153694
 
 

 ##########
 File path: lucene/core/src/java/org/apache/lucene/index/DocumentsWriter.java
 ##########
 @@ -168,27 +168,28 @@ long updateDocValues(DocValuesUpdate... updates) throws 
IOException {
   }
 
   private synchronized long 
applyDeleteOrUpdate(ToLongFunction<DocumentsWriterDeleteQueue> function) throws 
IOException {
-    // TODO why is this synchronized?
+    // This method is synchronized to make sure we don't replace the 
deleteQueue while applying this update / delete
+    // otherwise we might loose an update / delete if this happens 
concurrently to a full flush.
 
 Review comment:
   `loose` -> `lose`

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