[jira] [Created] (BEAM-3536) JobService#prepareJob should be one-to-many with JobService#run

["Thomas Groh (JIRA)" <ji...@apache.org>]

Thomas Groh created BEAM-3536:
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             Summary: JobService#prepareJob should be one-to-many with JobService#run
                 Key: BEAM-3536
                 URL: https://issues.apache.org/jira/browse/BEAM-3536
             Project: Beam
          Issue Type: Bug
          Components: runner-core
            Reporter: Thomas Groh


More specifically, prepare should not require a job; instead, it should return endpoints for any pre-job work that the client must perform (e.g. staging artifacts). Once the client has completed any pre-job work, those endpoints should return tokens by which the results of the pre-job work can be referenced. #run should then consume those tokens and use them to ensure that those results are available during execution.

 

The simple example is that #prepare should return an artifact staging endpoint, and #run should take tokens returned by that endpoint that it can understand when executing the job. This permits multiple pipelines to be run with the same artifacts, among other benefits, and reduces the statefulness of the prepare-run call sequence.



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