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https://issues.apache.org/jira/browse/DRILL-4286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16238251#comment-16238251
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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_r148684246
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/coord/zk/ZKClusterCoordinator.java
---
@@ -70,7 +72,10 @@
private final CountDownLatch initialConnection = new CountDownLatch(1);
private final TransientStoreFactory factory;
private ServiceCache<DrillbitEndpoint> serviceCache;
+ private DrillbitEndpoint endpoint;
+//private HashMap<MultiKey, DrillbitEndpoint> endpointsMap = new
HashMap<MultiKey, DrillbitEndpoint>();
+ private ConcurrentHashMap<MultiKey, DrillbitEndpoint> endpointsMap = new
ConcurrentHashMap<MultiKey,DrillbitEndpoint>();
--- End diff --
please add a comment about what this map contains.
> 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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