mikemccand commented on a change in pull request #1590:
URL: https://github.com/apache/lucene-solr/pull/1590#discussion_r443538263



##########
File path: lucene/core/src/java/org/apache/lucene/index/IndexWriter.java
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@@ -4286,25 +4287,30 @@ private synchronized void 
mergeFinish(MergePolicy.OneMerge merge) {
 
   @SuppressWarnings("try")
   private synchronized void closeMergeReaders(MergePolicy.OneMerge merge, 
boolean suppressExceptions) throws IOException {
-    final boolean drop = suppressExceptions == false;
-    try (Closeable finalizer = () -> merge.mergeFinished(suppressExceptions == 
false)) {
-      IOUtils.applyToAll(merge.readers, sr -> {
-        final ReadersAndUpdates rld = 
getPooledInstance(sr.getOriginalSegmentInfo(), false);
-        // We still hold a ref so it should not have been removed:
-        assert rld != null;
-        if (drop) {
-          rld.dropChanges();
-        } else {
-          rld.dropMergingUpdates();
-        }
-        rld.release(sr);
-        release(rld);
-        if (drop) {
-          readerPool.drop(rld.info);
-        }
-      });
-    } finally {
-      Collections.fill(merge.readers, null);
+    if (merge.isDone() == false) {

Review comment:
       It is a little weird that we don't then have a `merge.setDone()` or 
something inside this `if` to make the idempotency really clear.  But I 
understand this code is pre-existingly already hairy so it is not simple to fix 
that, so progress not perfection!




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