s1monw commented on a change in pull request #1552:
URL: https://github.com/apache/lucene-solr/pull/1552#discussion_r442023300



##########
File path: lucene/core/src/java/org/apache/lucene/index/IndexWriter.java
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@@ -3255,7 +3302,16 @@ private long prepareCommitInternal() throws IOException {
       } finally {
         maybeCloseOnTragicEvent();
       }
-     
+
+      if (onCommitMerges != null) {
+        mergeScheduler.merge(mergeSource, MergeTrigger.COMMIT);

Review comment:
       the last thing that I am afraid about is what if we has a MergeScheduler 
configured that blocks on this call like SerialMergeScheduler? I think there 
are multiple options like: documentation, skipping `COMMIT` merge triggers in 
SMS, adding a mergeAsync method to MS that has no impl in SMS... I think we 
should make sure that this is not trappy.




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