Recurring job runs multiple times

question
,
1

Version: Hangfire 1.7.31
SQL Server

I have hangfire with 3 servers:
|Name| Workers| Queues| Started| Heartbeat|

| server1:6980|1|server1, default|7 minutes ago|a few seconds ago|
| server2:7700|1|server2, default|7 minutes ago|a few seconds ago|
| server3:5664|1|server3, default|7 minutes ago|a few seconds ago|

It is configured like:

Screenshot_26
Screenshot_26576×602 20.6 KB

Job configured like:
RecurringJob.AddOrUpdate(“SomeUpdater-default”,
c => c.UpdateAsync(),
“* */20 * * * *”,
queue: “default”);

But it runs 3 or more times every 20 minutes:

Screenshot_22
Screenshot_22899×522 24.2 KB

I also added [DisableConcurrentExecution(180)] attribute to called method, but problem not solved.
Question: what is wrong in configuration/setup? I need to run method one time every 20 minutes.

2

“* */20 * * * *” was a root cause of the issue.
“0 */20 * * * *” is solution in my case