topic Re: How to stop parallel processing Programatically in Application Development and Automation Discussions

How to stop parallel processing Programatically

Former Member — Mon, 03 Oct 2016 05:03:44 GMT

Hello Techies,

We know that using Asynchronous rfc implements the parallel processing by using the syntax,

CALL FUNCTION STARTING NEW TASK DESTINATION IN GROUP keyword):

Let us say , i have one API name 'TEST_API' in 4 different systems and also i do have a central system from where i shall start the parallel processing by calling the API 'TEST_API' using rfc destinations.

i do as below

do 4 times.

CALL FUNCTION 'TEST_API'
STARTING NEW TASK name

Destination in GROUP 'my_group'
     PERFORMING get_details ON END OF TASK
   EXCEPTIONS
   system_failure = 1 MESSAGE mess
   communication_failure = 2 MESSAGE mess
   resource_failure = 3.

enddo.

Question is now after two process has started one each in separate system, i have decided to stop the parallel processing in between.

How do you stop the parallel processing programatically ?

Re: How to stop parallel processing Programatically

matt — Mon, 03 Oct 2016 05:09:05 GMT

Why have you asked almost exactly the same questions as here: ?

Are you and working on the same homework question, or same issue at work?

Re: How to stop parallel processing Programatically

Former Member — Mon, 03 Oct 2016 06:00:01 GMT

No, we are working on different scenarios.

My requirement is to stop the workprocess in between.

Re: How to stop parallel processing Programatically

matt — Mon, 03 Oct 2016 09:16:38 GMT

Are you working for the same company though? It just seems odd that two questions on parallel processing should appear in the same timeframe.

Re: How to stop parallel processing Programatically

Former Member — Mon, 03 Oct 2016 10:19:05 GMT

Hi Matthew,

I don't know about the other person who he is and where does he work, it is just a coincidence.

Better if you know the answer can you reply.

Regards,

Ravi

Re: How to stop parallel processing Programatically

matt — Mon, 03 Oct 2016 10:39:09 GMT

I accept your explanation.

I'm a moderator. It's part of my role to challenge suspicious behaviour, so don't get annoyed when that happens.

Re: How to stop parallel processing Programatically

Former Member — Mon, 03 Oct 2016 20:07:52 GMT

Ravi,

If you are still developing the parallel processing program:

You can define a TVARV variable. Check that variable within the parent program to see if parallel processing is enabled or disabled. If enabled, launch parallel job. If not, launch a serial job (preferably in background.)

If the program is already in production:

Have basis reduce the number of processes in the server group to just 1. You can't do that if your server group is shared by multiple programs. Depending on why you want to stop parallel processing, this may not solve the problem. For example, if each process is taking too long and basis doesn't want you to run dialog jobs running for long times, this will not help because the single thread will still be a dialog job.

Re: How to stop parallel processing Programatically

ravikiran_kongati — Tue, 04 Oct 2016 02:40:35 GMT

Hi Sudhi Karkada,

I am aware how to implement parallel processing. Also i am having my own group which is not shared as public to all to consume work process.

My question is once i start parallel process in other system how do i stop that?

Re: How to stop parallel processing Programatically

matt — Tue, 04 Oct 2016 04:51:59 GMT


Ravi Kiran Kongati wrote:

.

Question is now after two process has started one each in separate system, i have decided to stop the parallel processing in between.
How do you stop the parallel processing programatically ?

I don't really follow what you mean by "decide to stop". I also can't think of a scenario where you'd want to interrupt processing.

Perhaps you can explain the process more clear. For example, is it something like this?

LOOP.

Launch thread

IF <condition> is TRUE.

Kill running threads

Leave loop

ENDIF.

ENDLOOP.

Also, explain why you need to stop the running threads.

Re: How to stop parallel processing Programatically

Former Member — Tue, 04 Oct 2016 05:43:07 GMT

Let me drill down even more for understanding.

I have user interface in central system where user selects the multiple systems and click on execute.

When execute is clicked, from the central system i call Asynchronous RFC in each system launching a new task.

Suddenly user wants to stop the execution, we have provided a STOP/CANCEL button in the userinterface, in such a case already if a process is started how to kil the process.

Re: How to stop parallel processing Programatically

Tomas_Buryanek — Tue, 04 Oct 2016 07:07:53 GMT

Hello,

have you tried asynchronous RFC control statement:

WAIT UNTIL logical_expression

Re: How to stop parallel processing Programatically

Former Member — Tue, 04 Oct 2016 07:16:55 GMT

I think it could be possible to use fm TH_GET_WPINFO to get information about the running work processes. As that function module is not RFC-enabled, I would write a wrapper RFC module with the task of identifying the running processes and terminate them.

Re: How to stop parallel processing Programatically

Former Member — Tue, 04 Oct 2016 07:46:39 GMT

You have to stop the corresponding work process. FM TH_STOP_WP will do the job. To get the PID of your aRFC task you could use FM TH_WPINFO. Just have a look at function group THFB.

Re: How to stop parallel processing Programatically

matt — Tue, 04 Oct 2016 07:54:27 GMT

Ok, so it's not really parallism - it's executing programs remotely.

I suggest then, that the remote jobs are executed as background batch jobs (i.e. your remote function modules create background jobs that do the actual work - and return the information concerning them), scheduled to run immediately on the remote systems. Then you can use one of the function modules listed here: how to cancell background active job | SCN to cancel the job, if the user needs to do that.

Re: How to stop parallel processing Programatically

Former Member — Tue, 04 Oct 2016 08:00:28 GMT

He is using aRFC. That is something completely different from background jobs.

Edit: Have a look at Implementing Parallel Processing - Background Processing - SAP Library

Re: How to stop parallel processing Programatically

Former Member — Tue, 04 Oct 2016 08:08:02 GMT

Wait UNTIL logical_expression is to wait until the expression statement is true.

My requirement is not to wait i want to cancel already started parallel process.

Re: How to stop parallel processing Programatically

Former Member — Tue, 04 Oct 2016 08:15:19 GMT

Andre SchüßlerHi Matthew,

I am calling RFC in each system and not waiting for the already started taks to complete, thus it is a parallel processing.

Please see the reply from Andre.

Re: How to stop parallel processing Programatically

matt — Tue, 04 Oct 2016 09:48:18 GMT

It doesn't matter. I'm suggesting an alternative approach to the overall problem.

Re: How to stop parallel processing Programatically

Former Member — Tue, 04 Oct 2016 13:47:27 GMT

Please use following logic and let us know your feedback.

CALL FUNCTION 'CACS_DATE_GET_TIMESTAMP'

IMPORTING

e_timestamp = name

EXCEPTIONS

date_not_filled_but_time = 1

date_has_no_valid_format = 2

OTHERS = 3.

IF sy-subrc <> 0.

* Implement suitable error handling here

ENDIF.

CALL FUNCTION 'TEST_API'

STARTING NEW TASK name

Destination in GROUP 'my_group'

PERFORMING get_details ON END OF TASK

EXCEPTIONS

system_failure = 1 MESSAGE mess

communication_failure = 2 MESSAGE mess

resource_failure = 3.

WAIT UNTIL gv_functioncall = gv_done.

FORM get_details USING name.

RECEIVE RESULTS FROM FUNCTION 'TEST_API'

TABLES

gv_functioncall = gv_done.

ENDFORM.

Re: How to stop parallel processing Programatically

Former Member — Tue, 04 Oct 2016 14:16:32 GMT

Why should he do that? To kill a work process that was started via aRFC you can use the FMs I provided in my first post.

Edit: You can also take a look at the functionalities of tcode SM50/SM66 to get a deeper understanding on how to stop a work process.