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Merge pull request #28980 from alculquicondor/indexed-job 

Add details about using the Job completion index
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Kubernetes Prow Robot 2021-07-21 06:34:08 -07:00 committed by GitHub
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content/en/docs/concepts/workloads/controllers/job.md
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@ -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 completion is homologous to each other. Note that Jobs that have null
`.spec.completions` are implicitly `NonIndexed`. `.spec.completions` are implicitly `NonIndexed`.
- `Indexed`: the Pods of a Job get an associated completion index from 0 to - `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 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 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/). [Indexed Job for Parallel Processing with Static Work Assignment](/docs/tasks/job/indexed-parallel-processing-static/).