Behaviour of box job when issuing sendevent to kill.
Child jobs still running Even After issuing sendevent command to kill box job?
This is by design, when issuing a sendevent command to kill box job it just terminates the box job and the child jobs never gets terminated unless the child job has "job_terminator" parameter in the jil. Meanwhile, you may also issue sendevent command to child job which will terminate the box job.
Please find the snapshot below.
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Please find the Box-Job-Behavior in below link.