Executing several servers (webapi) with the same job at the same time

ferplain · December 13, 2017, 4:24pm

Hello all,

we want to deploy several webapi servers running hangfire in the background with the same configuration for all of them.

Our target is run the same recurring job every 15 minutes but only by one server at the same time. But it is not important what server runs the job.

I mean, we have (ie) 2 servers running the same recurring job every 15 minutes. The first running the job, wons. The other must not runs the same job again if no 15 minutes has left out from the previous execution. This means also the first server will fun the job when it is time to do it (15 minutes after).

If the first server fails or shutdown, the second will check when its time arrives and execute the job safely.

It is as a horizontal fault tolerance configuration for all servers. Only one job.

It is possible with HangFire (I suspect it is not).
Regards.

cdev · December 13, 2017, 10:35pm

Actually take a look at link below. If you are sharing same sql server, you may be able to achieve this.

github.com/HangfireIO/Hangfire

DisableConcurrentExecution filter

opened 07:00PM - 20 May 14 UTC

closed 07:00PM - 20 May 14 UTC

odinserj

This filter places a distributed lock before in the beginning of a method perfor…mance and releases it after it was completed using the `IServerFilter` interface. The type and method name are being used as a locking resource. Each storage uses its own distributed lock implementation: - SQL Server uses `sp_getapplock` stored procedure; - Redis implementation uses the technique described in [documentation](http://redis.io/commands/setnx). ``` csharp [DisableConcurrentExecution(timeoutInSeconds: 10 * 60)] public void SomeMethod() { // Operations performed inside a distributed lock } ``` This filter is very useful in situations when you are accessing/changing shared resources that does not provide built-in locking routines. Otherwise you should make argumentative decision between using locking system provided by resource itself and a custom distributed locking like this filter. For example, in SQL Server it is better to consider using different isolation levels and table hints first.

ferplain · December 14, 2017, 11:05am

Hi, thank you so much.
It seems running fine on our tests (with 2 servers) applying the attribute DisableConcurrentExecution.

Only one more question:
If I execute 2 servers (or more) on different computers, what is the server taking the control? Are there any way to know it?

Thanks again…

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Executing several servers (webapi) with the same job at the same time

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