Github user sohami commented on a diff in the pull request:
https://github.com/apache/drill/pull/993#discussion_r145495729
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/server/rest/DrillRestServer.java
---
@@ -204,9 +217,15 @@ public WebUserConnection provide() {
config.getLong(ExecConstants.HTTP_SESSION_MEMORY_RESERVATION),
config.getLong(ExecConstants.HTTP_SESSION_MEMORY_MAXIMUM));
+ // Create a dummy close future which is needed by Foreman only.
Foreman uses this future to add a close
+ // listener to known about channel close event from underlying
layer. We use this future to notify Foreman
+ // listeners when the Web connection between Web Client and
WebServer is closed. This will help Foreman to cancel
+ // all the running queries for this Web Client.
--- End diff --
We are using [web
session](https://github.com/apache/drill/blob/master/exec/java-exec/src/main/java/org/apache/drill/exec/server/rest/WebServer.java#L193)
concept for Drill's WebServer.
---
