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https://issues.apache.org/jira/browse/BEAM-6442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17547547#comment-17547547
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Kenneth Knowles commented on BEAM-6442:
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This issue has been migrated to https://github.com/apache/beam/issues/19284
> Incomplete JobService API Semantics
> -----------------------------------
>
> Key: BEAM-6442
> URL: https://issues.apache.org/jira/browse/BEAM-6442
> Project: Beam
> Issue Type: Test
> Components: beam-model
> Affects Versions: 2.9.0
> Reporter: Sam Rohde
> Priority: P3
>
> The JobService API (beam_job_api.proto) allows for the possibility of never
> seeing messages or states with Get(State|Message)Stream. This is because the
> Get(State|Message)Stream calls need to have the job id which can only be
> obtained from the RunJobResponse. But in order to see all messages/states the
> streams need to be opened before the job starts.
> This is fine in Dataflow as the preparation_id == job_id, but this is not
> true in Flink.
> Fix is to modify the API to only keep a single id to be used between the
> preparation/run APIs.
> Consumers of the API will have to be modified to meet the new semantics.
> Dev list thread
> (https://lists.apache.org/thread.html/3ace7585278c0545185fa4bb8d6975283d5c48c097e1bb2c2e18b9a2@%3Cdev.beam.apache.org%3E)
>
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