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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2019/11/01 16:48:00 UTC
[jira] [Work logged] (BEAM-8539) Clearly define the valid job state
transitions
[ https://issues.apache.org/jira/browse/BEAM-8539?focusedWorklogId=337407&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-337407 ]
ASF GitHub Bot logged work on BEAM-8539:
----------------------------------------
Author: ASF GitHub Bot
Created on: 01/Nov/19 16:47
Start Date: 01/Nov/19 16:47
Worklog Time Spent: 10m
Work Description: chadrik commented on pull request #9965: WIP: [BEAM-8539] Make job state transitions well-defined and consistent
URL: https://github.com/apache/beam/pull/9965
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 337407)
Remaining Estimate: 0h
Time Spent: 10m
> Clearly define the valid job state transitions
> ----------------------------------------------
>
> Key: BEAM-8539
> URL: https://issues.apache.org/jira/browse/BEAM-8539
> Project: Beam
> Issue Type: Improvement
> Components: beam-model, runner-core, sdk-java-core, sdk-py-core
> Reporter: Chad Dombrova
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The Beam job state transitions are ill-defined, which is big problem for anything that relies on the values coming from JobAPI.GetStateStream.
> I was hoping to find something like a state transition diagram in the docs so that I could determine the start state, the terminal states, and the valid transitions, but I could not find this. The code reveals that the SDKs differ on the fundamentals:
> Java InMemoryJobService:
> * start state: *STOPPED*
> * run - about to submit to executor: STARTING
> * run - actually running on executor: RUNNING
> * terminal states: DONE, FAILED, CANCELLED, DRAINED
> Python AbstractJobServiceServicer / LocalJobServicer:
> * start state: STARTING
> * terminal states: DONE, FAILED, CANCELLED, *STOPPED*
> I think it would be good to make python work like Java, so that there is a difference in state between a job that has been prepared and one that has additionally been run.
> It's hard to tell how far this problem has spread within the various runners. I think a simple thing that can be done to help standardize behavior is to implement the terminal states as an enum in the beam_job_api.proto, or create a utility function in each language for checking if a state is terminal, so that it's not left up to each runner to reimplement this logic.
>
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