The parallelism field sets how many Pods a Kubernetes Job may run at the same time. It provides Job workers with concurrent capacity, much like replicas do for a Deployment. After the Job completes, it cannot be scaled back up; delete and recreate it to process a new queue. section 10.3.1
Two workers for a queue
A Job with parallelism: 2 starts two worker Pods concurrently. In the queue-processing example, both Pods consume Redis tasks, then terminate after the queue is empty. Job status reports this as 0/1 of 2 while both workers run and shows both Pods Completed afterward. section 10.3.1
