findepi commented on code in PR #10691:
URL: https://github.com/apache/iceberg/pull/10691#discussion_r1677634825


##########
core/src/main/java/org/apache/iceberg/util/ParallelIterable.java:
##########
@@ -88,16 +92,26 @@ private ParallelIterator(
     @Override
     public void close() {
       // close first, avoid new task submit
-      this.closed = true;
+      this.closed.set(true);
+
+      try (Closer closer = Closer.create()) {
+        yieldedTasks.forEach(closer::register);
+        yieldedTasks.clear();
 
-      // cancel background tasks
-      for (Future<?> taskFuture : taskFutures) {
-        if (taskFuture != null && !taskFuture.isDone()) {
-          taskFuture.cancel(true);
+        // TODO close input iterables that were not started yet

Review Comment:
   the existing code (in main branch) closes iterables, not the iterators 
derived from them
   so to me it makes sense to reliably close all iterables.
   
   i can back out this TODO though, if this is preferred. 



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