some tasks are repeating on too quick an interval

[rkiddy]

In my logs I am seeing that some tasks run over a dozen times a day. When I restart the app, this does not occur.

I am observing that if a task instance ends in an error, then there will be a burst of instances. A subsequent successful run will not stop the rush of task instances being run.

The scheduler should not be multiply enqueueing, because I check for isQueued and isRunning at the start of the schedule check.

For example, I see these instances.

Task                    Queued                  Started                 Ended                 Runtime Result
DailyYubPopReader 	2021-04-05 00:12:49 	2021-04-05 00:14:06 	2021-04-05 00:14:27 	20 	0 	
DailyYubPopReader 	2021-04-04 12:12:01 	2021-04-04 12:12:01 	2021-04-04 12:12:21 	20 	0 	
DailyYubPopReader 	2021-04-04 12:09:53 	2021-04-04 12:09:53 	2021-04-04 12:10:13 	20 	0 	
DailyYubPopReader 	2021-04-04 12:07:48 	2021-04-04 12:07:48 	2021-04-04 12:08:08 	20 	0 	
DailyYubPopReader 	2021-04-04 12:05:38 	2021-04-04 12:05:38 	2021-04-04 12:05:58 	20 	0 	
DailyYubPopReader 	2021-04-04 12:03:29 	2021-04-04 12:03:29 	2021-04-04 12:03:49 	19 	0 	
DailyYubPopReader 	2021-04-04 12:01:25 	2021-04-04 12:01:25 	2021-04-04 12:01:45 	19 	0 	
DailyYubPopReader 	2021-04-04 12:00:25 	2021-04-04 12:00:25 	2021-04-04 12:00:45 	20 	0 	
DailyYubPopReader 	2021-04-04 11:59:13 	2021-04-04 11:59:13 	2021-04-04 11:59:33 	20 	0 	
DailyYubPopReader 	2021-04-04 11:57:48 	2021-04-04 11:57:48 	2021-04-04 11:58:21 	32 	2 	no such element
DailyYubPopReader 	2021-04-04 11:56:35 	2021-04-04 11:56:35 	2021-04-04 11:56:55 	20 	0 	
DailyYubPopReader 	2021-04-04 11:55:18 	2021-04-04 11:55:18 	2021-04-04 11:55:38 	19 	0 	
DailyYubPopReader 	2021-04-04 11:54:15 	2021-04-04 11:54:15 	2021-04-04 11:54:36 	20 	0 	
DailyYubPopReader 	2021-04-04 11:53:15 	2021-04-04 11:53:15 	2021-04-04 11:53:36 	21 	0 	
DailyYubPopReader 	2021-04-04 11:52:28 	2021-04-04 11:52:28 	2021-04-04 11:52:49 	20 	0 	
DailyYubPopReader 	2021-04-04 11:00:44 	2021-04-04 11:46:33 	2021-04-04 12:12:21 	1547 	0 	
DailyYubPopReader 	2021-04-03 22:58:40 	2021-04-03 23:00:05 	2021-04-03 23:00:26 	21 	0 	
DailyYubPopReader 	2021-04-03 22:55:00 	2021-04-03 22:57:10 	2021-04-03 22:58:07 	57 	2 	no such element
DailyYubPopReader 	2021-04-03 10:51:05 	2021-04-03 10:53:45 	2021-04-03 10:54:12 	26 	0 	
DailyYubPopReader 	2021-04-02 22:49:55 	2021-04-02 22:50:18 	2021-04-02 22:50:35 	16 	0 	

[rkiddy]

Also:

Task                    Queued                  Started                 Ended                 Runtime Result
DailyThmPopReader | 2021-04-04 23:47:03 | 2021-04-04 23:47:51 | 2021-04-04 23:47:51 | 0 | 0 |  
DailyThmPopReader | 2021-04-04 11:46:33 | 2021-04-04 11:46:33 | 2021-04-04 11:46:33 | 0 | 0 |  
DailyThmPopReader | 2021-04-04 11:41:25 | 2021-04-04 11:41:25 | 2021-04-04 11:41:25 | 0 | 0 |  
DailyThmPopReader | 2021-04-04 11:36:15 | 2021-04-04 11:36:15 | 2021-04-04 11:36:15 | 0 | 0 |  
DailyThmPopReader | 2021-04-04 11:30:31 | 2021-04-04 11:30:31 | 2021-04-04 11:30:31 | 0 | 0 |  
DailyThmPopReader | 2021-04-04 11:24:30 | 2021-04-04 11:24:30 | 2021-04-04 11:24:31 | 0 | 0 |  
DailyThmPopReader | 2021-04-04 11:19:01 | 2021-04-04 11:19:01 | 2021-04-04 11:19:02 | 0 | 0 |  
DailyThmPopReader | 2021-04-04 11:14:05 | 2021-04-04 11:14:05 | 2021-04-04 11:14:06 | 0 | 0 |  
DailyThmPopReader | 2021-04-04 11:09:11 | 2021-04-04 11:09:11 | 2021-04-04 11:09:11 | 0 | 0 |  
DailyThmPopReader | 2021-04-04 11:04:05 | 2021-04-04 11:04:05 | 2021-04-04 11:04:05 | 0 | 0 |  
DailyThmPopReader | 2021-04-04 11:04:02 | 2021-04-04 11:04:02 | 2021-04-04 11:04:02 | 0 | 0 |  
DailyThmPopReader | 2021-04-04 11:04:02 | 2021-04-04 11:04:02 | 2021-04-04 11:04:02 | 0 | 0 |  
DailyThmPopReader | 2021-04-04 10:28:34 | 2021-04-04 11:04:02 | 2021-04-04 11:46:33 | 2551 | 0 |  
DailyThmPopReader | 2021-04-03 22:26:28 | 2021-04-03 22:28:26 | 2021-04-03 22:28:26 | 0 | 0 |  
DailyThmPopReader | 2021-04-03 10:26:27 | 2021-04-03 10:26:27 | 2021-04-03 10:26:27 | 0 | 0