wombatu-kun commented on code in PR #19202:
URL: https://github.com/apache/hudi/pull/19202#discussion_r3585239869


##########
hudi-flink-datasource/hudi-flink/src/main/java/org/apache/hudi/table/format/cdc/CdcIterators.java:
##########
@@ -135,14 +153,25 @@ public boolean hasNext() {
     }
 
     @Override
-    public RowData next() {
+    public synchronized RowData next() {
+      if (closed) {
+        throw new NoSuchElementException("CDC file-splits iterator was closed 
during teardown");
+      }
+      if (recordIterator == null) {
+        throw new NoSuchElementException("No more CDC records");
+      }
       return recordIterator.next();
     }
 
     @Override
-    public void close() {
+    public synchronized void close() {
+      if (closed) {
+        return;
+      }
+      closed = true;
       if (recordIterator != null) {
         recordIterator.close();
+        recordIterator = null;
       }
       if (imageManager != null) {
         imageManager.close();

Review Comment:
   `imageManager` is already nulled on the line directly below 
`imageManager.close()` in `close()`, matching the `recordIterator` handling. 
The diff hunk shown in this comment is truncated one line short of it, so the 
null-out is not visible in the snippet.



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