How to understand when shedlock was acquired and released?

Question

I have code like this:

private final ThreadPoolTaskScheduler threadPoolTaskScheduler; // spring
private final LockingTaskExecutor lockingTaskExecutor; // shedlock
....
    threadPoolTaskScheduler.scheduleWithFixedDelay(
                    () -> {
                        lockConfiguration = ...
                        long start = System.currentTimeMillis();
                        LOGGER.info("Spring scheduler started task, awaiting shedlock ");
                        lockingTaskExecutor.executeWithLock((Runnable) () -> {
                                    LOGGER.info("Shedlock acquired. duration=[{}]ms", propertyItem, System.currentTimeMillis() - start);
                                taks();
                                },
                                lockConfiguration);
                    }, someInterval);

I have 2 nodes. According logs I see situation that task() works only on first node. On second node I see only Spring scheduler started task, awaiting shedlock

I believe it should not work in a such way and I want to investigate why it happens.

How can I subscribe on event when lock is released?

How long shedlock tries to acquire lock?

P.S.

someInterval = 30 minutes

lockConfiguration: atleast = 5 min, atMost=20min

Answer 1

I investigated source code and found out that shedlock tries to acquire lock and if lock busy it just skips the task