dnhatn commented on a change in pull request #1427: LUCENE-9304: Fix 
IW#getMaxCompletedSequenceNumber() 
URL: https://github.com/apache/lucene-solr/pull/1427#discussion_r407861138
 
 

 ##########
 File path: lucene/core/src/test/org/apache/lucene/index/TestIndexWriter.java
 ##########
 @@ -3949,4 +3950,69 @@ public void testRandomOperationsWithSoftDeletes() 
throws Exception {
       }
     }
   }
+
+  public void testMaxCompletedSequenceNumber() throws IOException, 
InterruptedException {
+    try (Directory dir = newDirectory();
+         IndexWriter writer = new IndexWriter(dir, new IndexWriterConfig());) {
+      assertEquals(1, writer.addDocument(new Document()));
+      assertEquals(2, writer.updateDocument(new Term("foo", "bar"), new 
Document()));
+      writer.flushNextBuffer();
+      assertEquals(3, writer.commit());
+      assertEquals(4, writer.addDocument(new Document()));
+      assertEquals(4, writer.getMaxCompletedSequenceNumber());
+      // commit moves seqNo by 2 since there is one DWPT that could still be 
in-flight
+      assertEquals(6, writer.commit());
+      assertEquals(6, writer.getMaxCompletedSequenceNumber());
+      assertEquals(7, writer.addDocument(new Document()));
+      writer.getReader().close();
+      // getReader moves seqNo by 2 since there is one DWPT that could still 
be in-flight
+      assertEquals(9, writer.getMaxCompletedSequenceNumber());
+    }
+    try (Directory dir = newDirectory();
 
 Review comment:
   I ran the second part of this test without the fix several thousand 
iterations, but all of them passed. It would be great if this test can 
reproduce the current issue.

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