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https://issues.apache.org/jira/browse/SPARK-41683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17651498#comment-17651498
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Apache Spark commented on SPARK-41683:
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User 'kuwii' has created a pull request for this issue:
https://github.com/apache/spark/pull/39190
> Spark UI: In jobs API, numActiveStages can be negative in some cases
> --------------------------------------------------------------------
>
> Key: SPARK-41683
> URL: https://issues.apache.org/jira/browse/SPARK-41683
> Project: Spark
> Issue Type: Bug
> Components: Spark Core, Web UI
> Affects Versions: 3.3.1
> Reporter: wy
> Priority: Minor
> Attachments: image-2022-12-22-16-06-21-180.png,
> image-2022-12-22-16-06-45-367.png, image-2022-12-23-13-24-30-412.png
>
>
> In API /api/v1/applications/.../jobs, for each job, there's one property
> called numActiveStages, telling how many active stages of the job.
> It is calculated by the following logic:
> * When stage is submitted, numActiveStages += 1.
> * When stage is completed, numActiveStages -= 1.
> * When job is ended, for each pending stage, numActiveStages -= 1.
> !image-2022-12-22-16-06-45-367.png!
> !image-2022-12-23-13-24-30-412.png!
> !image-2022-12-22-16-06-21-180.png!
>
> However, there's possibility that there's no stage submitted event for some
> skipped stages. In this case, when job ends, numActiveStages may be minus.
> Example:
> # job 0 started with stage 0, 1, 2
> ** stage 0: pending
> ** stage 1: pending
> ** stage 2: pending
> ** numActiveStages: 0
> # stage 0 submitted
> ** stage 0: active
> ** stage 1: pending
> ** stage 2: pending
> ** numActiveStages: 1
> # stage 0 completed
> ** stage 0: completed
> ** stage 1: pending
> ** stage 2: pending
> ** numActiveStages: 0
> # job 0 ended
> ** stage 0: completed
> ** stage 1: skipped
> ** stage 2: skipped
> ** numActiveStages: -2
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