[jira] [Assigned] (AURORA-686) Job updates may fail due to exceeding role quota

["Maxim Khutornenko (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AURORA-686?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Maxim Khutornenko reassigned AURORA-686:
----------------------------------------

    Assignee: Maxim Khutornenko

> Job updates may fail due to exceeding role quota
> ------------------------------------------------
>
>                 Key: AURORA-686
>                 URL: https://issues.apache.org/jira/browse/AURORA-686
>             Project: Aurora
>          Issue Type: Story
>          Components: Scheduler
>            Reporter: Maxim Khutornenko
>            Assignee: Maxim Khutornenko
>
> Current way of checking job quota during in-flight updates (i.e. within addInstance transaction) may lead to failed updates and inferior user experience. Since we are tracking quota at the role level but the update lock applied at the job level, there is always a possibility to exceed the allowed quota for long running updates. 
> This is especially a problem with the server side-driven process where a resumed update will restart in a potentially quite different quota environment (i.e. due to other jobs created while the update was paused). 
> Possible solutions:
> - per job quota tracking - requires significant refactoring;
> - hierarchical locking (e.g. add role lock in addition to job lock) - limits update concurrency per role;
> - front-loaded consumption (e.g. add additional job consumption during startJobUpdate and re-evaluate on update completion/termination) - will require persisting front-loaded value within job update schema but may be the way to go given current quota implementation.  



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