vigyasharma commented on code in PR #14417:
URL: https://github.com/apache/lucene/pull/14417#discussion_r2032521908


##########
lucene/core/src/java/org/apache/lucene/index/IndexWriter.java:
##########
@@ -1427,6 +1427,25 @@ public synchronized void advanceSegmentInfosVersion(long 
newVersion) {
     changed();
   }
 
+  /**
+   * If {@link SegmentInfos#counter} is below {@code newCounter} then update 
it to this value.
+   *
+   * @lucene.internal
+   */
+  public synchronized void advanceSegmentInfosCounter(long newCounter) {
+    this.ensureOpen();
+    if (segmentInfos.counter < newCounter) {
+      segmentInfos.counter = newCounter;
+    }
+    changed();
+  }
+
+  /** Returns the {@link SegmentInfos#counter}. */
+  public long getSegmentInfosCounter() {
+    this.ensureOpen();

Review Comment:
   Do we care that the writer is open for this API?



##########
lucene/test-framework/src/java/org/apache/lucene/tests/index/ThreadedIndexingAndSearchingTestCase.java:
##########
@@ -189,6 +190,19 @@ public void run() {
                     addedField = null;
                   }
 
+                  // Maybe advance segment counter
+                  if (random().nextBoolean()) {

Review Comment:
   Running this with 50% probability might slow down the tests too much with 
the synchronization this needs. Let's run it with a lower probability, 
something like 1 in 7 – ` if (random().nextInt(7) == 5) { ... }` 



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