stevenzwu commented on code in PR #10691:
URL: https://github.com/apache/iceberg/pull/10691#discussion_r1685540696
##########
core/src/main/java/org/apache/iceberg/util/ParallelIterable.java:
##########
@@ -136,30 +169,33 @@ private boolean checkTasks() {
}
}
- return !closed && (tasks.hasNext() || hasRunningTask);
+ return !closed.get() && (tasks.hasNext() || hasRunningTask);
}
- private Future<?> submitNextTask() {
- if (!closed && tasks.hasNext()) {
- return workerPool.submit(tasks.next());
+ private CompletableFuture<Optional<Task<T>>> submitNextTask() {
+ if (!closed.get()) {
+ if (!yieldedTasks.isEmpty()) {
+ return CompletableFuture.supplyAsync(yieldedTasks.removeFirst(),
workerPool);
+ } else if (tasks.hasNext()) {
+ return CompletableFuture.supplyAsync(tasks.next(), workerPool);
+ }
}
return null;
}
@Override
public synchronized boolean hasNext() {
- Preconditions.checkState(!closed, "Already closed");
-
- // if the consumer is processing records more slowly than the producers,
then this check will
- // prevent tasks from being submitted. while the producers are running,
this will always
- // return here before running checkTasks. when enough of the tasks are
finished that the
- // consumer catches up, then lots of new tasks will be submitted at
once. this behavior is
- // okay because it ensures that records are not stacking up waiting to
be consumed and taking
- // up memory.
- //
- // consumers that process results quickly will periodically exhaust the
queue and submit new
- // tasks when checkTasks runs. fast consumers should not be delayed.
- if (!queue.isEmpty()) {
+ Preconditions.checkState(!closed.get(), "Already closed");
+
+ // If the consumer is processing records more slowly than the producers,
the producers will
+ // eventually fill the queue and yield, returning continuations.
Continuations and new tasks
+ // are started by checkTasks(). The check here prevents us from
restarting continuations or
Review Comment:
sorry for the confusion. I didn't mean to change the sleep. I was mainly
talking about the code comment, which seems mainly about "resume too early"
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: issues-unsubscr...@iceberg.apache.org
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscr...@iceberg.apache.org
For additional commands, e-mail: issues-h...@iceberg.apache.org
