LuciferYang commented on code in PR #43502:
URL: https://github.com/apache/spark/pull/43502#discussion_r1395081107


##########
common/kvstore/src/main/java/org/apache/spark/util/kvstore/LevelDBIterator.java:
##########
@@ -182,23 +193,34 @@ public boolean skip(long n) {
 
   @Override
   public synchronized void close() throws IOException {
-    db.notifyIteratorClosed(this);
+    db.notifyIteratorClosed(it);
     if (!closed) {
-      it.close();
-      closed = true;
-      next = null;
+      try {
+        it.close();
+      } finally {
+        closed = true;
+        next = null;
+        cancelResourceClean();

Review Comment:
   Yes, we have discussed this issue. The reason for not directly calling 
`this.cleaner.clean()` is because the close process in `Cleaner` has added the 
operation of `synchronized (this._db)`, which is slightly different from the 
semantics of the original `close()` method. For specific discussions, please 
refer to this thread: 
   
   https://github.com/apache/spark/pull/43502#discussion_r1372954706



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