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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 22:42:06 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16252577#comment-16252577
] 

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_r150974323
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/server/DrillbitContext.java
---
    @@ -157,10 +157,29 @@ public DrillConfig getConfig() {
         return context.getConfig();
       }
     
    -  public Collection<DrillbitEndpoint> getBits() {
    +  public Collection<DrillbitEndpoint> getAvailableBits() {
         return coord.getAvailableEndpoints();
       }
     
    +  public Collection<DrillbitEndpoint> getBits() {
    +    return coord.getOnlineEndPoints();
    +  }
    +  
    +  public boolean isOnline(DrillbitEndpoint endpoint) { return endpoint.getState().equals(DrillbitEndpoint.State.ONLINE);
}
    +
    +  public boolean isForemanOnline() {
    +    DrillbitEndpoint foreman = getEndpoint();
    +    Collection<DrillbitEndpoint> dbs = getAvailableBits();
    +    for( DrillbitEndpoint db : dbs) {
    +      if( db.getAddress().equals(foreman.getAddress()) && db.getUserPort() ==
foreman.getUserPort()) {
    --- End diff --
    
    This is another place for a static function:
    
    ```
    public boolean isSameDrillbit(DrillbitEndpoint target) ...
    ```


> 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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