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https://issues.apache.org/jira/browse/DRILL-4286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16238261#comment-16238261
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ASF GitHub Bot commented on DRILL-4286:
---------------------------------------
Github user bitblender commented on a diff in the pull request:
https://github.com/apache/drill/pull/921#discussion_r148682167
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/coord/zk/ZKClusterCoordinator.java
---
@@ -229,27 +272,52 @@ public DrillbitEndpoint
apply(ServiceInstance<DrillbitEndpoint> input) {
});
// set of newly dead bits : original bits - new set of active bits.
- Set<DrillbitEndpoint> unregisteredBits = new HashSet<>(endpoints);
- unregisteredBits.removeAll(newDrillbitSet);
-
+ Set<DrillbitEndpoint> unregisteredBits = new HashSet<>();
// Set of newly live bits : new set of active bits - original bits.
- Set<DrillbitEndpoint> registeredBits = new HashSet<>(newDrillbitSet);
- registeredBits.removeAll(endpoints);
-
- endpoints = newDrillbitSet;
+ Set<DrillbitEndpoint> registeredBits = new HashSet<>();
+ // Update the endpoints map with change in state of the endpoint or
with the addition
--- End diff --
loop below does not handle change in state, so the comment should be
changed. Is the endpointsMap necessary because of port hunting ?
> 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 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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