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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2020/10/12 16:32:19 UTC
[GitHub] [flink] kezhuw commented on a change in pull request #13593: [FLINK-19427][FLINK-19489][tests] Fix test conditions for 'SplitFetcherTest.testNotifiesWhenGoingIdleConcurrent()'
kezhuw commented on a change in pull request #13593:
URL: https://github.com/apache/flink/pull/13593#discussion_r503408507
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File path: flink-connectors/flink-connector-base/src/test/java/org/apache/flink/connector/base/source/reader/fetcher/SplitFetcherTest.java
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@@ -120,16 +120,16 @@ public void testNotifiesWhenGoingIdleConcurrent() throws Exception {
final SplitFetcher<Object, TestingSourceSplit> fetcher = createFetcherWithSplit(
"test-split", queue, new TestingSplitReader<>(finishedSplitFetch("test-split")));
- final QueueDrainerThread queueDrainer = new QueueDrainerThread(queue);
+ final QueueDrainerThread queueDrainer = new QueueDrainerThread(queue, fetcher, 1);
queueDrainer.start();
- try {
- fetcher.runOnce();
+ fetcher.runOnce();
- assertTrue(queue.getAvailabilityFuture().isDone());
- } finally {
- queueDrainer.shutdown();
- }
+ queueDrainer.sync();
+
+ // either we got the notification that the fetcher went idle after the queue was drained (thread finished)
+ // or the fetcher was already idle when the thread drained the queue (then we need no additional notification)
+ assertTrue(queue.getAvailabilityFuture().isDone() || queueDrainer.wasIdleWhenFinished());
Review comment:
Nice assertion. I think this assertion holds because of:
* Inside `SplitFetcher.checkAndSetIdle`, `isIdle = true` happens before `elementsQueue.notifyAvailable()`, and both are atomic.
* In queue drainer thread, if `queue.poll`, which is also atomic, happens before `elementsQueue.notifyAvailable()` then `queue.getAvailabilityFuture().isDone()` holds, otherwise, `queueDrainer.wasIdleWhenFinished()` holds.
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