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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-4286) Have an ability to put server in quiescent mode of operation
Date Tue, 14 Nov 2017 22:42:09 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16252596#comment-16252596
] 

ASF GitHub Bot commented on DRILL-4286:
---------------------------------------

Github user paul-rogers commented on a diff in the pull request:

    https://github.com/apache/drill/pull/921#discussion_r150982788
  
    --- Diff: exec/java-exec/src/main/resources/drill-module.conf ---
    @@ -368,6 +368,13 @@ drill.exec: {
         // planning and managing queries. Primarily for testing.
         cpus_per_node: 0,
       }
    +  # Grace period is the amount of time where the drillbit accepts work after
    +  # the shutdown request is triggered. The primary use of grace period is to
    +  # avoid the race conditions caused by zookeeper delay in updating the state
    +  # information of the drillbit that is shutting down. So, it is advisable
    +  # to have a grace period that is atleast twice the amount of zookeeper
    +  # refresh time.
    +  grace_period : 10000
    --- End diff --
    
    Units? Just add a note to the end of your comment to say the units are ms. In the future,
I've found it to be handy to put the units in the name: `grace_period_ms` for example.


> 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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