tillrohrmann commented on a change in pull request #13040:
URL: https://github.com/apache/flink/pull/13040#discussion_r496721356
##########
File path:
flink-runtime/src/test/java/org/apache/flink/runtime/checkpoint/ZooKeeperCompletedCheckpointStoreITCase.java
##########
@@ -283,6 +286,54 @@ public void testConcurrentCheckpointOperations() throws
Exception {
recoveredTestCheckpoint.awaitDiscard();
}
+ /**
+ * FLINK-17073 tests that there is no request triggered when there are
too many checkpoints
+ * waiting to clean and that it resumes when the number of waiting
checkpoints as gone below
+ * the threshold.
+ *
+ */
+ @Test
+ public void testChekpointingPausesAndResumeWhenTooManyCheckpoints()
throws Exception{
+ ManualClock clock = new ManualClock();
+ clock.advanceTime(1, TimeUnit.DAYS);
+ int maxCleaningCheckpoints = 1;
+ CheckpointsCleaner checkpointsCleaner = new
CheckpointsCleaner();
+ CheckpointRequestDecider checkpointRequestDecider = new
CheckpointRequestDecider(maxCleaningCheckpoints, unused ->{}, clock, 1, new
AtomicInteger(0)::get, checkpointsCleaner::getNumberOfCheckpointsToClean);
+
+ final int maxCheckpointsToRetain = 1;
+ Executors.PausableThreadPoolExecutor executor =
Executors.pausableExecutor();
+ ZooKeeperCompletedCheckpointStore checkpointStore =
createCompletedCheckpoints(maxCheckpointsToRetain, executor);
+
+ //pause the executor to pause checkpoints cleaning, to allow
assertions
+ executor.pause();
+
+ int nbCheckpointsToInject = 3;
+ for (int i = 1; i <= nbCheckpointsToInject; i++) {
+ // add checkpoints to clean
+ TestCompletedCheckpoint completedCheckpoint = new
TestCompletedCheckpoint(new JobID(), i,
+ i, Collections.emptyMap(),
CheckpointProperties.forCheckpoint(CheckpointRetentionPolicy.RETAIN_ON_FAILURE),
+ checkpointsCleaner::cleanCheckpoint);
+ checkpointStore.addCheckpoint(completedCheckpoint);
+ }
+
+ Thread.sleep(100L); // give time to submit checkpoints for
cleaning
+
+ int nbCheckpointsSubmittedForCleaningByCheckpointStore =
nbCheckpointsToInject - maxCheckpointsToRetain;
+
assertEquals(nbCheckpointsSubmittedForCleaningByCheckpointStore,
checkpointsCleaner.getNumberOfCheckpointsToClean());
Review comment:
I am not entirely sure about which current code snippet we are talking
because this one seems to point at some outdated version. Hence I can only give
my general thoughts: I think that Roman has a valid point that relying on
implementation details such as the number of submitted `Runnables` is more
brittle than relying on some public API. I myself have built quite some of
these tests and regretted this shortly after when having to refactor these
tests. Hence, my recommendation would be to avoid this as much as possible and
rather try to rely on the public API of the components under test.
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