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Add details about using the Job completion index #28980

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Jul 21, 2021
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Add details about using the Job completion index #28980

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8 changes: 7 additions & 1 deletion content/en/docs/concepts/workloads/controllers/job.md
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Expand Up @@ -197,7 +197,13 @@ Jobs with _fixed completion count_ - that is, jobs that have non null
completion is homologous to each other. Note that Jobs that have null
`.spec.completions` are implicitly `NonIndexed`.
- `Indexed`: the Pods of a Job get an associated completion index from 0 to
`.spec.completions-1`, available in the annotation `batch.kubernetes.io/job-completion-index`.
`.spec.completions-1`. The index is available through three mechanisms:
- The Pod annotation `batch.kubernetes.io/job-completion-index`.
- As part of the Pod hostname, following the pattern `$(job-name)-$(index)`.
When you use an Indexed Job in combination with a
{{< glossary_tooltip term_id="Service" >}}, Pods within the Job can use
the deterministic hostnames to address each other via DNS.
- From the containarized task, in the environment variable `JOB_COMPLETION_INDEX`.
The Job is considered complete when there is one successfully completed Pod
for each index. For more information about how to use this mode, see
[Indexed Job for Parallel Processing with Static Work Assignment](/docs/tasks/job/indexed-parallel-processing-static/).
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