Takuya Kojima closed DRILL-4876.
    Resolution: Information Provided

> Remain disconnected connection
> ------------------------------
>                 Key: DRILL-4876
>                 URL: https://issues.apache.org/jira/browse/DRILL-4876
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Client - JDBC
>    Affects Versions: 1.6.0, 1.7.0, 1.8.0
>         Environment: CentOS 7
>            Reporter: Takuya Kojima
>            Assignee: Sorabh Hamirwasia
>            Priority: Minor
>         Attachments: 1_normal.png, 2_after_restart.png, 
> 3_try_to_connect_after_restart.png, 
> 4_disconnected_after_minEvictableIdleTimeMillis.png, 
> 5_after_disconnected.png, DrillClientConnectionResetTest.java, 
> drill-connection-pool.txt
> I'm using drill via Java Application on Tomcat with JDBC driver.
> I found that disconnected connection is not released when restart a drillbit.
> Drillbit is restarted, but JDBC's connection keeps to try to connect the 
> connection which started before restart.
> Expected behavior is its connection release and reconnect when drillbit is 
> restarted, but as a matter of fact, the connection will be released after 
> elapsed time of "minEvictableIdleTimeMillis" setting.
> As a result, the application can't connect in the meantime despite drillbit 
> is active.
> I thought this is not major issue, but Postgres and Vertica's JDBC driver 
> works well in the same situation. I spend the much time to identify the 
> cause, so I create a new issue of this.
> The attached is log and JMX's monitor graph with 1.6.0's JDBC driver, but I 
> also get it with 1.7.0 and 1.8.0.

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