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https://issues.apache.org/jira/browse/DRILL-4286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16252592#comment-16252592
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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_r150978981
  
    --- Diff: 
exec/java-exec/src/main/java/org/apache/drill/exec/server/rest/DrillRoot.java 
---
    @@ -315,7 +481,12 @@ public int compareTo(DrillbitInfo drillbitToCompare) {
     
           if (this.isVersionMatch() == drillbitToCompare.isVersionMatch()) {
             if (this.version.equals(drillbitToCompare.getVersion())) {
    -          return this.address.compareTo(drillbitToCompare.getAddress());
    +          {
    +            if(this.address.equals(drillbitToCompare.getAddress())) {
    +              return 
(this.controlPort.compareTo(drillbitToCompare.getControlPort()));
    --- End diff --
    
    Repeat of the `isSameDrillbit()` pattern noted earlier.


> 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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