[jira] [Commented] (DRILL-4286) Have an ability to put server in quiescent mode of operation

["John Omernik (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-4286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15269274#comment-15269274 ] 

John Omernik commented on DRILL-4286:
-------------------------------------

This feature would be very important for multi-tenant clusters and clusters where say you want to be able to shutdown half of the available drillbits for the evening when no one is running queries to be able to free up resources for other things in the cluster.   Lots of reasons for this, (Also going to add to DRILL-2656).


> 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
>
> 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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