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https://issues.apache.org/jira/browse/DRILL-4286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16068804#comment-16068804
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Paul Rogers commented on DRILL-4286:
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Additional notes to define states and messages.
States:
* Live: (normal)
* Shut-down grace period: (shut-down received, still accepting queries)
* Shut-down draining: (refuses new queries, continues to run existing queries)
* Quiescent: (up, but not accepting or running work)
* Terminated: (not really a state, Drillbit exits)
Transitions:
* Live, receive Shutdown message --> Grace
* Grace, after timeout --> Draining
* Draining, last fragment exits --> Quiescent
* Quiescent
** Auto terminate option --> Terminated
** Termination message --> Terminated
Shutdown message (via authenticated REST API message):
* Shut down and exit (for command line and Drill-on-YARN)
* Shut down and remain in quiescent state (for Mesos/Marathon integration)
* Shut down from quiescent mode (for Mesos/Marathon integration)
> Have an ability to put server in quiescent mode of operation
> ------------------------------------------------------------
>
> Key: DRILL-4286
> URL: https://issues.apache.org/jira/browse/DRILL-4286
> Project: Apache Drill
> Issue Type: New Feature
> Components: Execution - Flow
> Reporter: Victoria Markman
> Assignee: Venkata Jyothsna Donapati
>
> I think drill will benefit from mode of operation that is called "quiescent"
> in some databases.
> From IBM Informix server documentation:
> {code}
> Change gracefully from online to quiescent mode
> Take the database server gracefully from online mode to quiescent mode to
> restrict access to the database server without interrupting current
> processing. After you perform this task, the database server sets a flag that
> prevents new sessions from gaining access to the database server. The current
> sessions are allowed to finish processing. After you initiate the mode
> change, it cannot be canceled. During the mode change from online to
> quiescent, the database server is considered to be in Shutdown mode.
> {code}
> This is different from shutdown, when processes are terminated.
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