What does the parameter parallelism: 5 signify in a Kubernetes Job specification?

What does the parameter parallelism: 5 signify in a Kubernetes Job specification?

• A. The total number of pods to run.
• B. The number of pods that can be retried in case of failure.
• C. The number of pods to be created for each node.
• D. The number of pods that should be running in parallel.

Answer: (D)

Parallelism in a Kubernetes Job controls how many pods can run at the same time. Setting it to five means up to five pods will execute concurrently, speeding up the overall work when tasks are independent. The job will keep creating pods in parallel until the required number of successful completions is reached (completions), while the total number of pods launched depends on that completions value and any retries on failures. In other words, parallelism is about concurrency, not the total count of pods. If you also specify completions as, say, 20, and parallelism as 5, Kubernetes will run pods in groups of five until twenty pods have completed successfully. If a pod fails, it can be retried according to backoff limits, but that retry behavior is separate from how many pods run in parallel. Default parallelism is one if you don’t specify it.

Parallelism in a Kubernetes Job controls how many pods can run at the same time. Setting it to five means up to five pods will execute concurrently, speeding up the overall work when tasks are independent. The job will keep creating pods in parallel until the required number of successful completions is reached (completions), while the total number of pods launched depends on that completions value and any retries on failures.

In other words, parallelism is about concurrency, not the total count of pods. If you also specify completions as, say, 20, and parallelism as 5, Kubernetes will run pods in groups of five until twenty pods have completed successfully. If a pod fails, it can be retried according to backoff limits, but that retry behavior is separate from how many pods run in parallel. Default parallelism is one if you don’t specify it.