findepi commented on code in PR #10691:
URL: https://github.com/apache/iceberg/pull/10691#discussion_r1685430355
##########
core/src/main/java/org/apache/iceberg/util/ParallelIterable.java:
##########
@@ -192,4 +228,78 @@ public synchronized T next() {
return queue.poll();
}
}
+
+ private static class Task<T> implements Supplier<Optional<Task<T>>>,
Closeable {
+ private final Iterable<T> input;
+ private final ConcurrentLinkedQueue<T> queue;
+ private final AtomicBoolean closed;
+ private final int approximateMaxQueueSize;
+
+ private Iterator<T> iterator = null;
+
+ Task(
+ Iterable<T> input,
+ ConcurrentLinkedQueue<T> queue,
+ AtomicBoolean closed,
+ int approximateMaxQueueSize) {
+ this.input = Preconditions.checkNotNull(input, "input cannot be null");
+ this.queue = Preconditions.checkNotNull(queue, "queue cannot be null");
+ this.closed = Preconditions.checkNotNull(closed, "closed cannot be
null");
+ this.approximateMaxQueueSize = approximateMaxQueueSize;
+ }
+
+ @Override
+ public Optional<Task<T>> get() {
+ try {
+ if (iterator == null) {
+ iterator = input.iterator();
+ }
+
+ while (iterator.hasNext()) {
+ if (queue.size() >= approximateMaxQueueSize) {
+ // Yield. Stop execution so that the task can be resubmitted, in
which case call() will
+ // be called again.
+ return Optional.of(this);
+ }
+
+ T next = iterator.next();
+ if (closed.get()) {
+ break;
+ }
+
+ queue.add(next);
+ }
+ } catch (Throwable e) {
+ try {
+ close();
+ } catch (IOException closeException) {
+ // self-suppression is not permitted
+ // (e and closeException to be the same is unlikely, but possible)
+ if (closeException != e) {
+ e.addSuppressed(closeException);
+ }
+ }
+
+ throw e;
+ }
+
+ try {
+ close();
+ } catch (IOException e) {
+ throw new UncheckedIOException(e);
Review Comment:
thanks!
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