+Before execution of a job's tasks, Batch executes the job preparation task on each compute node that is scheduled to run a task. By default, the Batch service waits for the job preparation task to be completed before running the tasks scheduled to execute on the node. However, you can configure the service not to wait. If the node restarts, the job preparation task runs again, but you can also disable this behavior. If you have a job with a job preparation task and a job manager task configured, the job preparation task runs before the job manager task, just as it does for all other tasks. The job preparation task always runs first.
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