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https://issues.apache.org/jira/browse/DRILL-4286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16254144#comment-16254144
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ASF GitHub Bot commented on DRILL-4286:
---------------------------------------

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

    https://github.com/apache/drill/pull/921#discussion_r151246632
  
    --- Diff: 
protocol/src/main/java/org/apache/drill/exec/proto/beans/RpcType.java ---
    @@ -25,28 +25,8 @@
         HANDSHAKE(0),
         ACK(1),
         GOODBYE(2),
    -    RUN_QUERY(3),
    -    CANCEL_QUERY(4),
    -    REQUEST_RESULTS(5),
    -    RESUME_PAUSED_QUERY(11),
    -    GET_QUERY_PLAN_FRAGMENTS(12),
    -    GET_CATALOGS(14),
    -    GET_SCHEMAS(15),
    -    GET_TABLES(16),
    -    GET_COLUMNS(17),
    -    CREATE_PREPARED_STATEMENT(22),
    -    GET_SERVER_META(8),
    -    QUERY_DATA(6),
    -    QUERY_HANDLE(7),
    -    QUERY_PLAN_FRAGMENTS(13),
    -    CATALOGS(18),
    -    SCHEMAS(19),
    -    TABLES(20),
    -    COLUMNS(21),
    -    PREPARED_STATEMENT(23),
    -    SERVER_META(9),
    -    QUERY_RESULT(10),
    -    SASL_MESSAGE(24);
    +    REQ_RECORD_BATCH(3),
    +    SASL_MESSAGE(4);
    --- End diff --
    
    This is not my change. This file is generated by protobuf. When I looked 
into the issue I found out that user.proto and BitData.proto, Bitcontrol.proto 
have same enum (RpcType) . That is causing the issue.


> 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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