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https://issues.apache.org/jira/browse/DRILL-4286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16252574#comment-16252574
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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_r150973540
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/server/Drillbit.java ---
@@ -176,18 +200,37 @@ public void run() throws Exception {
logger.info("Startup completed ({} ms).",
w.elapsed(TimeUnit.MILLISECONDS));
}
+ /*
+ Wait uninterruptibly
+ */
+ public void waitForGracePeriod() {
+ ExtendedLatch exitLatch = null;
+ exitLatch = new ExtendedLatch();
+ exitLatch.awaitUninterruptibly(gracePeriod);
--- End diff --
I wonder about synchronization. This latch is private, so never triggered,
except in a timeout. How is this different than `Thread.sleep()`, other than
blocking interrupts? If so, maybe a comment to this effect.
Note also that this is called from inside a synchronized block. Just want
to verify that this is the intent.
> 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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