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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 Fri, 03 Nov 2017 19:38:06 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16238256#comment-16238256

ASF GitHub Bot commented on DRILL-4286:

Github user bitblender commented on a diff in the pull request:

    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/coord/ClusterCoordinator.java
    @@ -60,7 +61,26 @@
       public abstract Collection<DrillbitEndpoint> getAvailableEndpoints();
    +  /**
    +   * Get a collection of ONLINE drillbit endpoints by excluding the drillbits
    +   * that are in QUIESCENT state (drillbits that are shutting down). Primarily used by
the planner
    +   * to plan queries only on ONLINE drillbits and used by the client during initial connection
    +   * phase to connect to a drillbit (foreman)
    +   * @return A collection of ONLINE endpoints
    +   */
    +  public abstract Collection<DrillbitEndpoint> getOnlineEndPoints();
    +  public abstract RegistrationHandle update(RegistrationHandle handle, State state);
       public interface RegistrationHandle {
    +    /**
    +     * Get the drillbit endpoint associated with the registration handle
    +     * @return drillbit endpoint
    +     */
    +    public abstract DrillbitEndpoint getEndPoint();
    +    public abstract void setEndPoint( DrillbitEndpoint endpoint);
    --- End diff --

> 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
>            Priority: Major
> I think drill will benefit from mode of operation that is called "quiescent" in some
> 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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